SITRANS
Serial Communications
Accessories
SITRANS RD200/300
Operating Instructions • 05/2013
SIT SITRANS RD300RANS RD300
© Siemens AG 2013
Safety Guidelines: Warning notices must be observed to ensure personal safety as well as that of
others, and to protect the product and the connected equipment. These warning notices are
accompanied by a clarification of the level of caution to be observed.
Qualified Personnel: This device/system may only be set up and operated in conjunction with this
manual. Qualified personnel are only authorized to install and operate this equipment in accordance
with established safety practices and standards.
Unit Repair and Excluded Liability:
The user is responsible for all changes and repairs made to the device by the user or the user’s
agent.
All new components are to be provided by Siemens Milltronics Process Instruments.
Restrict repair to faulty components only.
Do not reuse faulty components.
WARNING: Cardboard shipping package provides limited humidity and moisture protection.
This product can only function properly and safely if it is correctly transported, stored,
installed, set up, operated, and maintained.
This product is intended for use in industrial areas. Operation of this equipment in a
residential area may cause interference to several frequency based communications.
Note: Always use product in accordance with specifications.
Copyright Siemens AG 2013. All Rights
Reserved
Disclaimer of Liability
This document is available in bound version
and in electronic version. We encourage users
to purchase authorized bound manuals, or to
view electronic versions as designed and
authored by Siemens Milltronics Process
Instruments. Siemens Milltronics Process
Instruments will not be responsible for the
contents of partial or whole reproductions of
either bound or electronic versions.
While we have verified the contents of this
manual for agreement with the instrumentation
described, variations remain possible. Thus we
cannot guarantee full agreement. The contents
of this manual are regularly reviewed and
corrections are included in subsequent editions.
We welcome all suggestions for improvement.
Technical data subject to change.
MILLTRONICS® is a registered trademark of Siemens Milltronics Process Instruments.
Contact SMPI Technical Publications at the
following address:
European Authorized Representative
Technical Publications
Siemens AG
Siemens Milltronics Process Instruments
1954 Technology Drive, P.O. Box 4225
Peterborough, Ontario, Canada, K9J 7B1
Email: techpubs.smpi@siemens.com
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Industry Sector
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Deutschland
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www. siemens.com/processautomation. Under Process Instrumentation, select Level
Measurement and then go to the manual archive listed under the product family.
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Weighing Systems and then go to the manual archive listed under the product family.
SITRANS RD300
i
Table of Contents
SAFETY NOTES ------------------------------------------------------------ 1
The Manual ------------------------------------------------------------------------- 1
SAFETY INFORMATION ------------------------------------------------- 2
SPECIFICATIONS ---------------------------------------------------------- 3
RD200 RS-232 Serial Adapter ------------------------------------------------ 3
RD200 RS-485 Serial Adapter ------------------------------------------------ 3
RD200 USB Serial Adapter ---------------------------------------------------- 3
RD300 RS-232 Serial Adapter ------------------------------------------------ 4
RD300 RS-485 Serial Adapter ------------------------------------------------ 4
RD300 USB Serial Adapter ---------------------------------------------------- 4
RD200/300 USB to RS-232 Converter -------------------------------------- 5
RD200/300 RS-232 to RS-422/485 Converter ---------------------------- 5
RD200/300 USB to RS-422/485 Converter -------------------------------- 5
SERIAL COMMUNICATIONS OVERVIEW -------------------------- 6
RD200 RS-232 SERIAL ADAPTER ------------------------------------ 8
Description ------------------------------------------------------------------------- 8
Installation -------------------------------------------------------------------------- 9
Connections -------------------------------------------------------------------- 10
RD200 Serial Communication Address (serl) ------------------------ 10
RD200 RS-485 SERIAL ADAPTER ----------------------------------- 11
Description ----------------------------------------------------------------------- 11
Installation ------------------------------------------------------------------------ 12
RD200 Serial Communication Address (serl) ------------------------ 12
Connections -------------------------------------------------------------------- 15
RD200 TO USB SERIAL ADAPTER---------------------------------- 16
Description ----------------------------------------------------------------------- 16
Installation ------------------------------------------------------------------------ 16
RD300 RS-232 SERIAL ADAPTER ----------------------------------- 17
Description ----------------------------------------------------------------------- 17
Installation ------------------------------------------------------------------------ 18
Connections -------------------------------------------------------------------- 18
RD300 Serial Communication Address (serial) -------------------- 19
RD300 RS-485 SERIAL ADAPTER ----------------------------------- 20
Description ----------------------------------------------------------------------- 20
Installation ------------------------------------------------------------------------ 21
RD300 Serial Communication Address (serIAl) -------------------- 21
SIT SITRANS RD300RANS RD300
ii
Connections -------------------------------------------------------------------- 24
RD300 TO USB SERIAL ADAPTER---------------------------------- 25
Description ----------------------------------------------------------------------- 25
Installation ------------------------------------------------------------------------ 25
RD200/300 USB TO RS-232 CONVERTER ------------------------ 26
Description ----------------------------------------------------------------------- 26
Installation ------------------------------------------------------------------------ 26
RD200/300 RS-232 TO RS-422/485 CONVERTER --------------- 28
Description ----------------------------------------------------------------------- 28
Installation ------------------------------------------------------------------------ 29
Connections -------------------------------------------------------------------- 31
RD200/300 USB TO RS-422/485 CONVERTER ------------------ 33
Description ----------------------------------------------------------------------- 33
Installation ------------------------------------------------------------------------ 34
Connections -------------------------------------------------------------------- 35
TROUBLESHOOTING ---------------------------------------------------- 37
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 1
SAFETY NOTES
Special attention must be paid to warnings and notes highlighted from
the rest of the text by grey boxes.
CAUTION: relates to the caution symbol on the product,
and means that failure to observe the necessary
precautions can result in electric shock.
!
WARNING: relates to a caution symbol on the product,
and means that failure to observe the necessary
precautions can result in death, serious injury, and/or
considerable material damage.
WARNING: means that failure to observe the necessary
precautions can result in death, serious injury, and/or
considerable material damage.
CAUTION: means that failure to observe the necessary precautions
can result in considerable material damage.
Note: Means important information about the product or that part
of the operating manual.
The Manual
This manual provides descriptions for the Converters and Adapters for
connection to the SITRANS RD200/300. The manual is designed to
help you get an overview of each and to aid in the selection and setup
of the correct converter or adapter for your applications.
If you have any questions, comments, or suggestions about the manual
contents, please email us at techpubs.smpi@siemens.com.
For the complete library of Siemens manuals, go to
www.siemens.com/processautomation.
SIT SITRANS RD300RANS RD300
Page 2 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
SAFETY INFORMATION
!
CAUTION: Read complete instructions prior to
installation and operation of the meter.
WARNING: Risk of electric shock or personal injury.
WARNING: Hazardous voltages exist within
enclosure. Installation and service should be
performed only by trained service personnel.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 3
SPECIFICATIONS
RD200 RS-232 Serial Adapter
COMPATIBILITY EIA-232
CONNECTORS PC compatible 9-pin D subminiature connector (DB9) and
RJ11 (adapter to meter)
CABLE 7' (2.1 m) standard modular cable provided with adapter
DISTANCE Adapter to RD200 meter: 7' (2.1 m) max; Adapter to
computer: 50' (15 m) max; serial interface cable not
provided
POWER Powered by RD200 RJ11 connection
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
RD200 RS-485 Serial Adapter
COMPATIBILITY EIA-485
CONNECTORS Removable screw terminal connector and RJ11 (adapter to
meter)
CABLE 7' (2.1 m) standard modular cable provided with adapter
DISTANCE Adapter to RD200 meter: 7' (2.1 m) max; Adapter to
computer: 3,937' (1,200 m) max
POWER Powered by RD200 RJ11 connection
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
RD200 USB Serial Adapter
COMPATIBILITY USB 1.1, USB 2.0
CONNECTORS RJ11, and USB Type B
CABLE One 7' (2.1 m) standard modular cable and one 3.28’ (1.0
m) USB A-B Male cable provided with adapter
DISTANCE Adapter to RD200 meter: 7' (2.1 m) max; USB connection
to PC: 10' (3 m) max
DRIVER Windows 98/SE, ME, 2000, Server 2003/2008, XP 32/64-
Bit, Vista 32/64-Bit, Windows 7 32/64-Bit
POWER USB Port
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and Receive
(RX)
SIT SITRANS RD300RANS RD300
Page 4 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RD300 RS-232 Serial Adapter
COMPATIBILITY EIA-232
CONNECTORS PC compatible 9-pin D subminiature connector (DB9) and
RJ45 (adapter to meter)
CABLE 6' (1.8 m) standard Cat5e cable provided with adapter
DISTANCE Adapter to RD300 meter: 6' (1.8 m) max; Adapter to
computer: 50' (15 m) max; serial interface cable not
provided
POWER Powered by RD300 meter M-Link connection
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
RD300 RS-485 Serial Adapter
COMPATIBILITY EIA-485
CONNECTORS Removable screw terminal connector and RJ11 (adapter to
meter)
CABLE 6' (1.8 m) standard Cat5e cable provided with adapter
DISTANCE Adapter to RD300 meter: 6' (1.8 m) max; Adapter to
computer: 3,937' (1,200 m) max
POWER Powered by RD300 meter M-Link connection
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
RD300 USB Serial Adapter
COMPATIBILITY USB 1.1, USB 2.0
CONNECTORS RJ45, and USB Type B
CABLE One 6' (1.8 m) standard Cat5e cable and one 3.28’ (1.0 m)
USB A-B Male cable provided with adapter
DISTANCE Adapter to RD300 meter: 6' (1.8 m) max. USB connection:
10' (3 m) max
DRIVER Windows 98/SE, ME, 2000, Server 2003/2008, XP 32/64-
Bit, Vista 32/64-Bit, Windows 7 32/64-Bit
POWER USB Port
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and Receive
(RX)
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 5
RD200/300 USB to RS-232 Converter
COMPATIBILITY USB 1.1, USB 2.0, EIA-232
CONNECTORS PC compatible 9-pin D subminiature connector (DB9) and
USB Type A
DRIVERS Windows
®
98/2000/ME/XP
DISTANCE USB connection: 10' (3 m) max; RS-232 connection: 50'
(15m) max
POWER USB port
RD200/300 RS-232 to RS-422/485 Converter
COMPATIBILITY EIA-232, EIA-422, and EIA-485
CONNECTORS Screw terminal connector and DB9
DISTANCE RS-232 connection: 50' (15 m) max; RS-422/485
connection: 3,937' (1,200 m) max
NUMBER OF
UNITS
Up to 31 RS-485 compatible devices
POWER 9-12 VDC; 115 VAC/12 VDC adapter included
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
ISOLATION Isolated RS-232 to RS-422/485: 1500 VAC between data
lines; 700 VDC input/output-to-power
RS-232 to RS-422/485: 1500 VAC between data lines only
RD200/300 USB to RS-422/485 Converter
COMPATIBILITY USB 1.1, USB 2.0, EIA-422, and EIA-485
CONNECTORS Screw terminal connector and USB Type B
DRIVERS Windows
®
98/2000/ME/XP, Linux 2.4 & greater
DISTANCE USB connection: 10' (3 m) max; RS-422/485 connection:
3,937' (1,200 m) max
NUMBER OF
UNITS
Up to 31 RS-485 compatible devices
POWER USB port
STATUS
INDICATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
ISOLATION Isolated USB to RS-422/485: 1500 VAC between data
lines; 700 VDC input/output-to-power
USB to RS-422/485: 1500 VAC between data lines only
SIT SITRANS RD300RANS RD300
Page 6 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
SERIAL COMMUNICATIONS OVERVIEW
RS-232, RS-422, and RS-485 are standard interfaces approved by the
Electronic Industries Alliance (EIA) for connecting serial devices. In EIA
terms, the device (such as meter) that connects to the interface is called
a Data Communications Equipment (DCE) and the device to which it
connects (such as a computer) is called a Data Terminal Equipment
(DTE).
The RS-422 standard was designed to replace the older RS-232
standard because it supports higher data rates and greater immunity to
electrical interference. RS-485 is similar to RS-422 but can support
multi-point connections per line because it uses lower-impedance
drivers and receivers.
Line drivers and receivers are used to exchange data between two or
more points (nodes) on a serial communications network. Reliable data
communications can be difficult in the presence of induced noise,
ground level differences, and other hazards associated with installation
of a network. When communicating at high data rates, or over long
distances in real world environments, RS-232 is often inadequate. The
differential data transmission of RS-422 and RS-485 offers superior
performance in most applications. Differential signals can help nullify the
effects of ground shifts and induced noise signals that can appear as
common mode voltages on a network.
RS-422 was designed for greater distances and higher baud rates than
RS-232. In its simplest form, a pair of converters from RS-232 to
RS-422 (and back again) can be used to form an "RS-232 extension
cord". Data rates of up to 100 kbits/second and distances of 3,937'
(1,200 m) can be accommodated with RS-422.
RS-422 devices however cannot be used to construct a true multi-point
network. A multi-point network consists of multiple drivers and receivers
connected on a single bus, where any point (node) can transmit and/or
receive data. RS-485 is an enhanced version of the RS-422 standard,
which allows multiple drivers and receivers on the same two-wire or
four-wire system. The RS-485 standard specifies up to 32 drivers and
32 receivers on a single bus, but with the introduction of "automatic"
repeaters and high-impedance drivers/receivers, this number can be
extended to hundreds of points (nodes) on a network.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 7
The cabling used for an RS-422 or RS-485 serial communications
network should always be a high quality cable such as Belden 8162 or
Alpha 6203C. A two-wire system requires two twisted pairs, and a four-
wire system requires three twisted pairs (the extra twisted pair is
needed for the signal ground).
The graphic below illustrates how to connect a general four-wire
network (a four-wire network actually contains 5 wires).
General Four-Wire Network Connection
The graphic below illustrates how to connect a general two-wire network
(a two-wire network actually contains 3 wires).
Note that the RS-232 to RS-422/485 coverter and USB to RS-
422/485 converter have DIP switches that allow for two-wire
connections without the need to externally wire the DO to the DI
and the /DO to the /DI (see the converter section for complete
details).
General Two-Wire Network Connection
SIT SITRANS RD300RANS RD300
Page 8 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RD200 RS-232 SERIAL ADAPTER
Description
The RD200 RS-232 serial adapter converts the serial output of the
RD200 meter to an unbalanced, full-duplex RS-232 signal.
The RS-232 port has a female DB9 connector with pins 2 (RX output),
3 (TX input), and 5 (Signal Ground). Pins 7 (RTS) and 8 (CTS) are tied
together, and pins 1 (CD), 4 (DTR), and 6 (DSR) are tied together. The
adapter is powered by the RD200 meter.
Baud rates are adjustable and handled by the RD200 (see the RD200
Instruction Manual for more details).
The RD200 RS-232 serial adapter has three diagnostic LEDs: a Power
(P) LED to show when the adapter is powered properly, a Transmit Data
(TX) LED to show when the adapter is sending data out from the PC,
and a Receive Data (RX) LED to show when the adapter is receiving
data from the RD200 meter.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 9
Installation
The graphic below shows the connection of a RD200 meter to a PC
using the RD200 RS-232 serial adapter. The RD200 RS-232 serial
adapter has an RJ11 connector to connect the RD200 meter copy cable
and a PC compatible 9-pin D subminiature connector (DB9). The DB9
can be connected directly to the PC or by using a standard serial
extension cable.
Modular Cable
(Provided)
RS-232 Adapter
Serial
Cable
(Not Provided)
RS-232 Adapter Connections
SIT SITRANS RD300RANS RD300
Page 10 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
Connections
A RD200 meter copy cable is provided to connect the RD200 meter to the
RD200 RS-232 serial adapter. The graphic below shows the RD200
meter copy cable details.
(WH) 1
(BK) 2
(R) 3
(G) 4
(Y) 5
(BL) 6
1
2
3
4
5
6
Standard Modular Cable Wiring
RD200 Serial Communication Address (serl)
For the RD200 meter the address may be programmed from 00 to 99
for PDC Protocol and from 1 to 247 for Modbus RTU. The RD200 meter
is factory set to PDC Protocol at address 00.
To change the RD200 meter address:
1. Press and hold Right arrow and Menu buttons for three
seconds to access Advanced Features menu of the meter.
2. Press Up arrow until Serial (SErL) menu is displayed and press
Enter/Ack, Addr is displayed.
3. Press Enter/Ack to change meter address using Right and Up
arrow buttons. Press Enter/Ack to accept.
4. Press Menu button to exit and return to Run Mode.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 11
RD200 RS-485 SERIAL ADAPTER
Description
The RD200 RS-485 serial adapter converts the serial output of the
RD200 meter to balanced, full or half-duplex RS-485 signals.
The RD200 RS-485 serial adapter has a removable screw terminal
connector for the 485 terminals which includes Transmit Data (DO) and
(/DO), Receive Data (DI) and (/DI), and Signal Ground.
Baud rates are adjustable and handled by the RD200 (see the RD200
Instruction Manual for more details).
The RD200 RS-485 serial adapter has three diagnostic LEDs: a Power
(P) LED to show when the adapter is powered properly, a Transmit Data
(TX) LED to show when the adapter is sending data out from the PC
side, and a Receive Data (RX) LED to show when the adapter is
receiving data from the RD200 meter.
SIT SITRANS RD300RANS RD300
Page 12 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
Installation
The graphic on page 13 shows the connection of a RD200 meter to a
PC using the RD200 RS-485 serial adapter and a RS-232 to RS-
422/485 converter in an RS-422 network. The RD200 RS-485 serial
adapter has an RJ11 connector to connect the RD200 meter copy cable
and a screw terminal connector to connect to the RS-422 network. The
graphic on page 14 shows the connection of several RD200 meters with
RD200 RS-485 serial adapters to a PC using a RS-232 to RS-422/485
converter in an RS-485 network.
RD200 Serial Communication Address (serl)
When using more than one meter in a multi-drop or multi-point mode,
each meter must be provided with its own unique address. For the
RD200 meter the address may be programmed from 00 to 99 for PDC
Protocol and from 1 to 247 for Modbus RTU. The RD200 meter is
factory set to PDC Protocol at address 00.
To change the RD200 meter address:
1. Press and hold Right arrow and Menu buttons for three
seconds to access Advanced Features menu of the meter.
2. Press Up arrow until Serial (SErL) menu is displayed and press
Enter/Ack, Addr is displayed.
3. Press Enter/Ack to change meter address using Right and Up
arrow buttons. Press Enter/Ack to accept.
4. Press Menu button to exit and return to Run Mode.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 13
RS-422 or RS-485 Wiring
Notes:
1. Termination resistors are optional and values depend on the
cable length and characteristic impedance. Consult the cable
manufacturer for recommendations.
2. Refer to RS-232 to RS-422/485 Converter documentation for
further details.
3. Use shielded cable, twisted-pairs plus ground. Connect ground
shield only at one location.
SIT SITRANS RD300RANS RD300
Page 14 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RS-485 Two-Wire Multi-Drop Wiring
Notes:
1. Termination resistors are optional and values depend on the
cable length and characteristic impedance. Consult the cable
manufacturer for recommendations.
2. Refer to RS-232 to RS-485 Converter documentation for further
details.
3. Use shielded cable, twisted-pair plus ground. Connect ground
shield only at one location.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 15
Connections
A RD200 meter copy cable is provided to connect the RD200 meter to the
RD200 RS-485 serial adapter. The graphic below shows the RD200
meter copy cable details.
(WH) 1
(BK) 2
(R) 3
(G) 4
(Y) 5
(BL) 6
1
2
3
4
5
6
Standard Modular Cable Wiring
The table below details the wiring connections from the RD200 RS-485
serial adapter to an RS-422/485 serial converter (such as the RS-232 to
RD-422/485 coverters or USB to RS-422/485 converters) for a four-wire
network.
Connections for RD200 RS-485 Adapter to Serial Converter
If the serial converter is configured for a two-wire network then the
requirement to externally wire the DO to the DI and the /DO to the /DI
on the RD200 RS-485 serial adapter screw terminal connector is
needed.
RD200 RS-485 serial adapter to
RS-422/485 Serial Converter
Connections
RS-422/485
Serial Converter
RS-485 Adapter
DO DI
DO DI
DI DO
DI DO
SIT SITRANS RD300RANS RD300
Page 16 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RD200 TO USB SERIAL ADAPTER
Description
The RD200 USB serial adapter allows for direct connection of a RD200
meter to the USB port of a PC.
Installation
The graphic below shows the connection of a RD200 Series meter to a
PC using a RD200 to USB Serial Adapter.
Modular Cabl
e
(Provided)
USB Serial Adapter
USB
Cable
(Provided)
RD200 USB Adapter Connections
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 17
RD300 RS-232 SERIAL ADAPTER
Description
The RD300 RS-232 serial adapter converts the serial output of the
RD300 meter to an unbalanced, full-duplex RS-232 signal.
The RS-232 port has a female DB9 connector with pins 2 (RX output),
3 (TX input), and 5 (Signal Ground). Pins 7 (RTS) and 8 (CTS) are tied
together, and pins 1 (CD), 4 (DTR), and 6 (DSR) are tied together. The
adapter is powered by the RD300 meter M-Link connection.
Baud rates are adjustable and handled by the RD300 (see the RD300
Instruction Manual for more details).
The RD300 RS-232 serial adapter has three diagnostic LEDs: a Power
(P) LED to show when the adapter is powered properly, a Transmit Data
(TX) LED to show when the adapter is sending data out from the PC
side, and a Receive Data (RX) LED to show when the adapter is
receiving data from the RD300 meter.
SIT SITRANS RD300RANS RD300
Page 18 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
Installation
The graphic below shows the connection of a RD300 meter to a PC
using the RD300 RS-232 serial adapter. The RD300 RS-232 serial
adapter has an RJ45 connector to connect the Cat5e cable and a PC
compatible 9-pin D subminiature connector (DB9). The DB9 can be
connected directly to the PC or by using a standard serial extension
cable.
Cat5e Cable
(Provided)
RS-232 Adapter
Serial
Cable
(Not Provided)
RS-232 Adapter Connections
Connections
A Cat5e cable is provided to connect the RD300 meter to the RD300 RS-
232 serial adapter.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 19
RD300 Serial Communication Address (serial)
For the RD300 meter the address may be programmed from 001 to 247.
The RD300 meter is factory set to address 001.
To change the RD300 meter address:
1. Press and hold the Menu button for three seconds to access
Advanced Features menu of the meter.
2. Press Up arrow until Serial (SEriaL) menu is displayed and press
Enter, Addres is displayed.
3. Press Enter to change meter address using Right and Up arrow
buttons. Press Enter to accept.
4. Press Menu button to exit and return to Run Mode.
SIT SITRANS RD300RANS RD300
Page 20 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RD300 RS-485 SERIAL ADAPTER
Description
The RD300 RS-485 serial adapter converts the serial output of the
RD300 meter to balanced, full or half-duplex RS-485 signals.
The RD300 RS-485 serial adapter has a removable screw terminal
connector for the RS-485 terminals which includes Transmit Data (DO)
and (/DO), Receive Data (DI) and (/DI), and Signal Ground. The adapter
is provided by the RD300 meter M-Link connection.
Baud rates are adjustable and handled by the RD300 (see the RD300
Instruction Manual for more details).
The RD300 RS-485 serial adapter has three diagnostic LEDs: a Power
(P) LED to show when the adapter is powered properly, a Transmit Data
(TX) LED to show when the adapter is sending data out from the PC
side, and a Receive Data (RX) LED to show when the adapter is
receiving data from the RD300 meter.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 21
Installation
The graphic on page 22 shows the connection of a RD300 meter to a
PC using the RD300 RS-485 serial adapter and a RS-232 to RS-
422/485 converter in an RS-422 network. The RD300 RS-485 serial
adapter has an RJ45 connector to connect the Cat5e cable and a screw
terminal connector to connect to the RS-422 network. The graphic on
page 23 shows the connection of several RD300 meters with RD300
RS-485 serial adapters to a PC using a RS-232 to RS-422/485
converter in an RS-485 network.
RD300 Serial Communication Address (serIAl)
When using more than one meter in a multi-drop or multi-point mode,
each meter must be provided with its own unique address. For the
RD300 meter the address may be programmed from 001 to 247. The
RD300 meter is factory set to address 001.
To change the RD300 meter address:
1. Press and hold the Menu button for three seconds to access
Advanced Features menu of the meter.
2. Press Up arrow until Serial (SEriaL) menu is displayed and press
Enter, Addres is displayed.
3. Press Enter to change meter address using Right and Up arrow
buttons. Press Enter to accept.
4. Press Menu button to exit and return to Run Mode.
SIT SITRANS RD300RANS RD300
Page 22 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RS-422 or RS-485 Wiring
Notes:
1. Termination resistors are optional and values depend on the
cable length and characteristic impedance. Consult the cable
manufacturer for recommendations.
2. Refer to RS-232 to RS-422/485 Converter documentation for
further details.
3. Use shielded cable, twisted-pairs plus ground. Connect ground
shield only at one location.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 23
RS-485 Two-Wire Multi-Drop Wiring
Notes:
1. Termination resistors are optional and values depend on the
cable length and characteristic impedance. Consult the cable
manufacturer for recommendations.
2. Refer to RS-232 to RS-485 Converter documentation for further
details.
3. Use shielded cable, twisted-pair plus ground. Connect ground
shield only at one location.
SIT SITRANS RD300RANS RD300
Page 24 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
Connections
A Cat5e cable is provided to connect the RD300 meter to the RD300 RS-
485 serial adapter.
The table below details the wiring connections from the RD300 RS-485
serial adapter to an RS-422/485 serial converter (such as the RS-232 to
RD-422/485 coverters or USB to RS-422/485 converters) for a four-wire
network.
Connections for RS-485 Adapter to Serial Converter
If the serial converter is configured for a two-wire network then the
requirement to externally wire the DO to the DI and the /DO to the /DI
on the RD300 RS-485 serial adapter screw terminal connector is
needed.
RD300 RS-485 serial adapter to
RS-422/485 Serial Converter
Connections
RS-422/485
Serial Converter
RS-485 Adapter
DO DI
DO DI
DI DO
DI DO
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 25
RD300 TO USB SERIAL ADAPTER
Description
The RD300 USB serial adapter RD300 to USB Serial Adapter allows for
direct connection of a RD300 Series meter to the USB port of a PC.
Installation
The graphic below shows the connection of a RD300 Series meter to a
PC using a RD300 to USB Serial Adapter.
RD300 USB Adapter Connections
SIT SITRANS RD300RANS RD300
Page 26 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RD200/300 USB TO RS-232 CONVERTER
Description
The USB to RS-232 Converter allows for direct connection of a serial
device to the USB port of a PC.
Installation
The graphic on page 27 shows the connection of a RD200 meter to a
PC using a USB to RS-232 Converter, RS-232 serial adapter, and the
SITRANS RD200/300 meter copy Cable.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 27
Modular Cable
(Provided)
RS-232 Adapter
RS-232
Converter
Connections for USB to RS-232 converter to serial device
SIT SITRANS RD300RANS RD300
Page 28 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
RD200/300 RS-232 TO RS-422/485 CONVERTER
Description
The RS-232 to RS-422/485 converter converts unbalanced, full-duplex
RS-232 signals to balanced, full or half-duplex RS-422 or RS-485
signals.
The RS-232 port, configured as a DTE port, has a female DB9
connector with pins 2 (RX output), 3 (TX input), and 5 (Signal Ground).
Pins 7 (RTS) and 8 (CTS) are tied together, and pins 1 (CD), 4 (DTR),
and 6 (DSR) are tied together. The RS-485 terminal blocks support
Transmit Data (DO) and (/DO), Receive Data (DI) and (/DI), and Signal
Ground. A separate terminal block supports the power input (+12VDC)
and power ground (GND).
Baud rates are automatic and handled by the RS-232 to RS-422/485
converter.
The RS-232 to RS-422/485 converter has three diagnostic LEDs: a
Power (P) LED to show when the converter is powered properly, a
Transmit Data (TX) LED to show when the converter is sending data out
from the PC side, and a Receive Data (RX) LED to show when the
converter is receiving data from the network side.
The DIP switch SW1 is located between the screw terminal connectors
and allows for system configurations.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 29
Installation
The DIP switch SW1 allows for several different options. Factory
settings for the switch are shown below.
12345
RS-232 to RS-422/485 converter Terminal Connectors and DIP
Switch
The TERM switch position adds an internal 120 ohm termination resistor
when ON (up). Termination should be used on both ends of the network
with high data rates and long wiring runs.
To configure a two-wire network set both of the 2 WIRE switch positions
to ON (up). For a four-wire network set both of the 2 WIRE switches to
OFF (down).
When the RS422 switch position is ON (up) it is configured for an
RS-422 network. For RS-485 networks set the RS422 switch to OFF
(down).
The ECHO switch position allows the data being sent from the RS-232
port to be echoed back into the RS-232 port. In most networks, this is
an undesired effect and the ECHO switch would be OFF (down).
RS-232 to RS-422/485 converter DIP Switch Settings
RS-232 to RS-422/485 converter DIP Switch Settings
SW1 Switch Position ON Setting Function
1 Network Termination Included
(120 ohm)
2 2-Wire Network Mode Connection
(factory setting)
3 2-Wire Network Mode Connection
(factory setting)
4 RS-422 Mode
5 ECHO Mode
SIT SITRANS RD300RANS RD300
Page 30 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
The graphic below shows an example configuration of a two-wire network.
Each device (such as an RD200 meter) connected to the same network
must have a unique address.
RS-485 Two-Wire Multi-Drop Wiring
Notes:
1. Termination resistors are optional and values depend on the
cable length and characteristic impedance. Consult the cable
manufacturer for recommendations.
2. Refer to RD200 RS-485 serial adapter documentation for further
details.
3. Use shielded cable, twisted-pair plus ground. Connect ground
shield only at one location.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 31
Connections
To power the RS-232 to RS-422/485 converter, connect 12 VDC to the
+12VDC and ground to the GND screw terminals from the supplied 115
VAC/12 VDC adapter.
The RS-232 to RS-422/485 converter may be configured for either a
four-wire or two-wire network. The table below details the wiring
connections from the RS-232 to RS-422/485 converter to an RS-422/485
serial device in a four-wire network.
RS-232 to RS-422/485 converter to RS-422/485 Serial Device
Four-Wire Connections
RS-232 to RS-422/485
Serial Converter
RS-422/485 Serial Device
DO DI
DO DI
DI DO
DI DO
SIT SITRANS RD300RANS RD300
Page 32 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
The table below details the wiring connections from the RS-232 to RS-
422/485 converter to an RS-422/485 serial device in a two-wire network
when the DIP switches on the RS-232 to RS-422/485 converter have
been set to the “2-Wire Mode”.
RS-232 to RS-422/485 converter to RS-422/485 Serial Device
Two-Wire Connections
RS-232 to RS-422/485
Serial Converter
RS-422/485 Serial Device
DO DATA
DO DATA
The RS-232 to RS-422/485 converter internally connects the /DI to the
/DO and the DI to the DO when the DIP switches are set to “2-Wire
Mode”. Either the /DI or /DO could be used to connect to /DATA and
either the DI or DO could be used to connect to DATA.
Two RS-232 to RS-422/485 Serial Converters could be used as a serial
extender to allow RS-232 serial devices to communicate over long
distances. This would allow an RS-232 device to operate up to 3,937’
(1,200 m).
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 33
RD200/300 USB TO RS-422/485 CONVERTER
Description
The USB to RS-422/485 converter converts USB to balanced, full or
half-duplex RS-422 or RS-485 signals.
The USB to RS-422/485 converter has a removable screw terminal
connector for the RS-422/485 terminals which includes Transmit Data
(DO) and (/DO), Receive Data (DI) and (/DI), and Signal Ground.
Baud rates are automatic and handled by the USB to RS-422/485
converter.
The USB to RS-422/485 converter has three diagnostic LEDs: a Power
(P) LED to show when the converter is powered properly, a Transmit
Data (TX) LED to show when the converter is sending data out from the
PC side, and a Receive Data (RX) LED to show when the converter is
receiving data from the network side.
The DIP switch SW1 is located inside the case and allows for system
configurations.
SIT SITRANS RD300RANS RD300
Page 34 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
Installation
The DIP switch SW1 allows for several different options. Factory
settings for the switch are shown below.
12345
USB to RS-422/485 converter DIP Switch Location
The termination switch position adds an internal 120 ohm termination
resistor when ON (up). Termination should be used on both ends of the
network with high data rates and long wiring runs.
To configure a two-wire network set both of the 2-wire switch positions
to ON (up). For a four-wire network set both of the 2-wire switches to
OFF (down).
When the RS-422 switch position is ON (up) and the RS-485 switch
position is OFF (down) it is configured for an RS-422 network. When the
RS-422 switch position is OFF (down) and the RS-485 switch position is
ON (up) it is configured for an RS-485 network.
USB to RS-422/485 converter DIP Switch Settings
SW1 Switch Position ON Setting Function
1 Network Termination Included
(120 ohm)
2 2-Wire Network Mode Connection
(factory setting)
3 2-Wire Network Mode Connection
(factory setting)
4 RS-422 Mode
5 RS-485 Mode (factory setting)
USB to RS-422/485 converter DIP Switch Settings
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 35
Connections
The USB to RS-422/485 converter is powered by the USB port.
The USB to RS-422/485 converter can be configured for either a four-
wire or two-wire network. The table below details the wiring connections
from the USB to RS-422/485 converter to an RS-422/485 serial device in
a four-wire network.
The table below details the wiring connections from the USB to RS-
422/485 converter to an RS-422/485 serial device in a two-wire network
when the DIP switches on the USB to RS-422/485 converter have been
set to the “2-Wire Mode”.
The USB to RS-422/485 converter internally connects the /DI to the /DO
and the DI to the DO when the DIP switches are set to “2-Wire Mode”.
Either the /DI or /DO could be used to connect to /DATA and either the DI
or DO could be used to connect to DATA.
USB to RS-422/485 converter to RS-422/485
Serial Device Four-Wire Connections
USB to RS-422/485
converter Serial
Converter
RS-422/485 Serial Device
DO DI
DO DI
DI DO
DI DO
USB to RS-422/485 converter to RS-422/485
Serial Device Two-Wire Connections
USB to RS-422/485
converter Serial Converter
RS-422/485 Serial
Device
DO DATA
DO DATA
SIT SITRANS RD300RANS RD300
Page 36 COMMS ACCESSORIES – OPERATING INSTRUCTIONS A5E31979195
The graphic below shows an example configuration of a two-wire network.
Each device (such as an RD200 meter) connected to the same network
must have a unique address.
USB to RS-422/485
Converter
USB Connection
to PC
Last Adapter
R
Shield
Twisted-Pair
R
DI DI DO DO
DI DI DO DO
Modular Cable to
Meter (Provided)
Adapter #1
RS-422/485
Adapter
DI
DI
DO DO
R = 120 Ohm termination resistor, typical
RS-485 Two-Wire Multi-Drop Wiring
Notes:
1. Termination resistors are optional and values depend on the
cable length and characteristic impedance. Consult the cable
manufacturer for recommendations.
2. Refer to RD200 RS-485 serial adapter documentation for further
details.
3. Use shielded cable, twisted-pair plus ground. Connect ground
shield only at one location.
SITRANS RD300
A5E31979195 COMMS ACCESSORIES – OPERATING INSTRUCTIONS Page 37
TROUBLESHOOTING
Symptom Check/Action
Power LED is off RS-232 or RS-485 serial adapters:
1. Check modular cable connection
2. Check power to meter
RS-232 to RS-422/485 converter:
1. Check wall plug adapter output
2. Check power connection polarity
USB to RS-422/485 converter, USB serial
adapters:
1. Check USB connections
2. Try different USB port
3. Check USB port with other device
Meter not communicating
with SITRANS RD Software
or other programs
Check:
1. Serial adapter and cable
2. Serial protocol selected
3. Meter address and baud rate
4. RD Software address and baud rate
5. Check DIP switch setting on the RS-232
to RS-422/485 converter or USB to RS-
422/485 converter
If only the TX (or DATA IN)
data status LED is flashing
when serial communications
attempted
Check:
1. Serial adapter and cable
2. Serial protocol selected
3. Meter address and baud rate
4. RD Software address and baud rate
5. Check DIP switch setting on the RS-232
to RS-422/485 converter or USB to RS-
422/485 converter
If both data status LEDs (TX
and RX) are off when trying
to communicate
Remove all unnecessary cables and meters.
Try getting the system to work with only one
meter (to ease troubleshooting) and then
expand the system one device at a time.
RS-232 serial adapters, or RS-232 to
RS-422/485 converter:
1. Check serial cable
2. Connect the DB9 directly to the PC
3. Try a different serial port
Communications slow Increase the baud rate
Random communication
errors
1. Increase the TX delay time
2. Decrease the baud rate
Other symptoms not
described above
Call your local Siemens representative for
assistance
Notes
Notes.fm Page 1 Thursday, October 11, 2001 8:48 AM
LIM7232SI_A
05/13
For more information
www.siemens.com/level
www.siemens.com/weighing
Siemens AG
Industry Sector
1954 Technology Drive
P.O. Box 4225
Peterborough, ON
Canada K9J7B1
email: tech
p
ubs.sm
p
i@siemens.com
Subject to change without prior notice
A5E31979195 Rev. AA
© Siemens AG 2013
www.siemens.com/processautomation
*A5E31979195*
Printed in Canada
