660EVAL - RF SOLUTIONS - Datasheet.Live

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

• Intelligent Modem RF Transceiver

• RF Data Rates to 100 kbps

• Up to 250 metres Range

• Selectable ‘Narrowband’ RF Channels

• Crystal Controlled RF Design

• Supply Voltage 3.3V

• Serial Data Interface with Handshake

• Host Data Rates up to 38,400 Baud

• Very Stable Operating Frequency

• Low Profile Ceramic DIL Package

• Operates from –20 to +70 0C

• Evaluation Board for Rapid Development

Operating Modes

• Point to Point

• Broadcast

• One to Many Network

• Many to One Network

Description

The RF650 radio transceiver module provides a reliable wireless communications for the transfer of data at

Gaussian Frequency Shift Keying (GFSK), Manchester encoded, RF data rates of up to 100 kbps. Their

unique features of narrow band operation and user channel selection combined with excellent interference

rejection make them an ideal choice for next generation applications. The transceivers have the functions of a

complete radio modem and simply require CMOS/TTL data at the transmit input and the corresponding

transceiver(s) output the same data. Preamble and CRC are automatically generated and added to the RF

transmission.

Operating within the 433MHz band the modules operate in user selectable channels. The RF650 can use any

channel in 100kHz steps. The modules both use a crystal controlled design which provides narrow band

performance which is far superior to other wideband ‘SAW’ based designs.

Possible applications include one-to-one and multi-node wireless links in applications including car and

building security, EPOS, inventory tracking, remote industrial process monitoring and computer networking.

Because of their small size and low power requirements, both modules are ideal for use in portable, battery-

powered applications such as hand-held terminals.

Part Numbering

Part Number Description

RF650 Smart Radio Transceiver Module, 433MHz

RF650-868 Smart Radio Transceiver Module, 868MHz

RF650-EVAL Evaluation Host PCB for RF650 Module (Module not Included)

Applications

• Wireless Security Syst ems

• EPOS Terminals

• Sensor Data logging

• Remote Telemetry & Telecommand

• Remote Meter Reading

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

Table Of Contents

1

1 M

Mo

od

du

ul

le

e

C

Co

on

nn

ne

ec

ct

ti

io

on

ns

s.

..

.3

3

2

2 O

Op

pe

er

ra

at

ti

io

on

n.

..

.4

4

2

2.

.1

1 O

Op

pe

er

ra

at

ti

io

on

n

M

Mo

od

de

es

s.

..

.4

4

2

2.

.2

2 S

Se

er

ri

ia

al

l

D

Da

at

ta

a

F

Fo

or

rm

ma

at

t.

..

.4

4

2

2.

.3

3 C

CT

TS

S

t

ti

im

mi

in

ng

g.

..

.4

4

3

3 C

Co

on

nf

fi

ig

gu

ur

ra

at

ti

io

on

n.

..

.5

5

3

3.

.1

1 S

So

of

ft

tw

wa

ar

re

e

C

Co

on

nf

fi

ig

gu

ur

ra

at

ti

io

on

n.

..

.6

6

4

4 A

Ap

pp

pl

li

ic

ca

at

ti

io

on

n

I

In

nf

fo

or

rm

ma

at

ti

io

on

n.

..

.7

7

4

4.

.1

1 A

Ap

pp

pl

li

ic

ca

at

ti

io

on

n

S

Sc

ch

he

em

ma

at

ti

ic

c.

..

.7

7

4

4.

.2

2 A

An

nt

te

en

nn

na

a

D

De

es

si

ig

gn

n.

..

.8

8

5

5 T

Te

ec

ch

hn

ni

ic

ca

al

l

S

Sp

pe

ec

ci

if

fi

ic

ca

at

ti

io

on

ns

s.

..

.9

9

5

5.

.1

1 M

Me

ec

ch

ha

an

ni

ic

ca

al

l

D

De

et

ta

ai

il

l.

..

.9

9

6

6 E

Ev

va

al

lu

ua

at

ti

io

on

n

B

Bo

oa

ar

rd

d.

..

.1

10

0

6

6.

.1

1 C

Co

on

nn

ne

ec

ct

ti

io

on

ns

s.

..

.1

10

0

6

6.

.2

2 M

Me

ec

ch

ha

an

ni

ic

ca

al

l

D

De

et

ta

ai

il

ls

s.

..

.1

11

1

6

6.

.3

3 D

DI

IP

P

S

Sw

wi

it

tc

ch

h

C

Co

on

nf

fi

ig

gu

ur

ra

at

ti

io

on

n.

..

.1

11

1

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

1 Module Connections

Pin Descriptions

Number Name Type Description

1 Vcc Power Positive supply voltage connection. Decouple with 100n ceramic

capacitor to ground.

2, 3, 4, 6 GND Power Connect to 0 volts.

5 Antenna In / Out Nominal 50 ohm input/output impedance capacitively isolated

from the internal circuit.

7, 8 nc - No Connection.

9 PD In Power Down pin. Take low for low power standby mode.

10 Tx In

Transmit data input from host controller.

Data input to the transmitter can be directly interfaced to CMOS

logic drive operating on the same supply voltage as the

transceiver.

11 Rx Out Received data output to host controller (CMOS logic out)

representing true data as supplied to the transmitter.

12, 13 Data Rate In Host Data Rate selection.

14 Configuration In High for normal operation, low to configure module.

15 RTS In Logic ‘0’ is Request To Send.

Take low when the host is ready to send data to the module or is

ready to receive data from the module.

16 CTS Out Logic ‘0’ is Clear To Send.

Taken high when the module is busy.

Host Data Rate Selection

DR2 (pin 13) DR1 (pin12) Baud Rate

0 0 4,800

0 1 9,600

1 0 19,200

1 1 38,400

Vcc 1

GND 2

GND 3

GND 4

ANT 5

GND 6

NC 7

NC 8

16 CTS

15 RTS

14 Config

13 DR2

12 DR1

11 Rx

10 Tx

9 PD

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

2 Operation

The Host Data Rate pins are read when the PD pin goes high. The RF650 must be put into standby mode by

taking the PD pin low in order to change the selection.

The size of RF data packets are set during configuration. If fewer bytes are received by the RF650 than the

preset size, then after 10ms from the last byte received from the host, the RF packet will be processed

(expanded to meet the preset packet size) and transmitted. The RF data packet size must be set the same for

transmitter and receiver, otherwise the received packets will be discarded.

In order to optimise data rate , in a point-to-point configuration where data is mostly being sent in one

direction, the packet size for one data direction can be set to the maximum size, however the reverse direction

may be set to a smaller packet size, to implement an acknowledge reply for example.

The RTS pin overrides the timeout value. If a short data packet is sent, RF transmission will start as soon as

the RTS pin is taken ‘high’ after the last byte is sent to the module.

The RF650 contains an on-board data buffer equal to two data packets. Therefore if RTS is asserted (then the

host is unable to receive data) the RF650 will store a max of two data packets, all further data packets

received will be discarded.

No RF packets will be received by the module when it is in power down standby mode.

Each RF650 has its own preset address. This is set during configuration. Any data received is examined and

the address header embedded within the data packet is compared with the RF60 address. Only data received

with matching address will be processed and output to the host, all other data will be discarded.

All RF650 modules are shipped with a default address of 7E7E7E7E.

2.1 Operation Modes

The addressing protocol employed enables many different configurations such including:

one-to-one operation; for point to point data communication

broadcast operation; where a single master address many RF650 modules concurrently. (using many

RF650 modules set to the same address),

one-to-many; A network consisting a master and many slaves (the receivers all have the same address)

many-to-one; where the transmitters all send to a single receiver address.

Because each RF650 can contain a unique address, multiple RF650 networks can co-exist in the same area.

2.2 Serial Data Format

The RF650 serial format settings are:

Baud Rate: Defined by DR1 and DR2 Pins

Data Bits: 8

Parity: None

Stop Bits: 1

Flow Control: Hardware

2.3 CTS timing

With a standard buffer size of 30 bytes, CTS is asserted 41uS after the buffer is full. In cases where less

than 20 bytes are sent CTS is asserted after a timeout of 10mS.

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

3 Configuration

The configuration of the RF650 module may be changed by setting the Configuration pin low, then sending a

set of configuration data bytes to the module on the Tx pin.

Alternatively the Configuration software can be used to setup the module through a graphical interface, please

refer to section 3.1 for details on this.

Byte Name Description Default Supplied Value

0 MSB 7E hex

1 7E hex

2 7E hex

3

Destination Address

LSB 7E hex

4 MSB 7E hex

5 7E hex

6 7E hex

7

RF650 Address

LSB 7E hex

8 RF Channel 100 kHz step offset from 422.4MHz 107 (433.1MHz)

0 = -10dBm

1 = -2dBm

2 = +6dBm

9 Tx Power

3 = +10dBm

0 (-10dBm)

10 Tx data packet size 1 – 31 bytes 30 bytes

11 Rx data packet size 1 – 31 bytes 30 bytes

The RF Channel is calculated as:

433 MHz working frequency: Config value (decimal) = (desired RF frequency - 422.4MHz) * 10

868 MHz working frequency: Config value (decimal) = [(desired RF frequency / 2) - 422.4MHz] * 10

Please Note, the calculated value must be converted into hexadecimal format.

The Configuration pin must be held low for at least the first byte to change the RF650 module into

configuration mode. If the Configuration pin is still low at the end of the configuration then the module

will send the current configuration back to the host. To retrieve the current configuration without

changing any options the host can send a single byte to the module and wait for the response.

It is not necessary to send all configuration bytes to the module, but all data sent must be valid. For example

to change the destination address the host may just send four bytes. Configuration data excluded from the end

of the data stream will be unchanged. The RF650 module will accept a short configuration after a 10ms

timeout after the last byte sent to the module, or when the RTS pin goes high. This allows for the host to easily

change the destination address of the RF data packet, thus enabling one RF650 to send individual data to

several different recipient modules.

A destination address of 00000000 will reset the RF650 to the default settings shown above.

RF data packets received by the RF650 with the embedded destination address which matches the RF650

address will be accepted, processed and passed to the host, all of the RF data packets will be ignored.

When configuring the destination or RF650 address an incorrect number of bytes for an address will leave the

current address unchanged.

An invalid Transmitter Power or Packet Size setting will leave the current setting unchanged.

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

3.1 Software Configuration

To configure the module with the software configuration tool please follow the steps below.

The Evaluation board is particularly useful for configuration as it allows direct connection to a RS232 Com Port

and 5-12V power supply. Please refer to section 6 for details on the Evaluation Board Hardware.

The software files are available from the download section of the RF Solutions website.

I. Download and install Labview RunTime Version 6.0.

II. Download the ‘RF650_Config’ Zip file and extract the executable to a local file on your PC.

III. Set the configuration Pin of the RF650 module to Low.

IV. Connect the module to a power supply and the RS232 port of your PC.

V. Run the RF650_Config executable.

VI. Set the baud rate and COM port as required by your setup.

VII. Select your frequency range with the top toggle switch as shown below

VIII. Click the read config button to read the current configuration of the module

IX. Click the write config button to write the configuration of the module

Figure 1. Configuration register not read Figure 2. Configuration register read / written

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

4 Application Information

Connection of the RF650 to an RS232 host terminal device such as a PC serial port may easily be achieved

using the circuit as below.

The 9 way ‘D’ socket (J1) provides the standard pinout required to connect directly to the serial port of any std

PC using a 9 way male/female cable. The MAX3232 (U2, a low voltage RS232 line driver) provides level

conversion between the RS232 levels on the serial port and the logic levels pins of the RF650 module. (note

that direct connection of RS232 levels to the module will result in immediate destruction of the device). J6

provides power to the circuit, pin 2 of J6 connects to your Vcc supply while pin 1 connects to your Ground.

4.1 Application Schematic

Circuit notes:

J2,3,4 and 5 allow the selection of the following modes:

J2 when shorted sets the module for normal running mode or if left open selects configuration mode.

J3 and J4 selects the host data rate.

J5 when sorted puts the module into standby mode or when left open in normal operation.

If two such circuits are constructed then it will be possible to interconnect two PC’s and test out the

performance of the hybrids. When both circuits are powered up it will be necessary for them to have each

others address in the “Destination Address” register.

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

4.2 Antenna Design

The design and positioning of the aerial is as crucial as the module performance itself in achieving a good

wireless system range. The following will assist the designer in maximising system performance.

The RF ground pin should be connected to a ground plane which should shield the aerial connection and the

PCB layout around the aerial track itself should be such as to give a 50 Ohm impedance. The aerial should be

kept as far away from sources of electrical interference as physically possible. The specified power supply

decoupling capacitors should be placed close to the module as possible and have direct connections to the

relevant pins.

The antenna ‘hot end’ should be kept clear of any objects, especially any metal as this can severely restrict the

efficiency of the antenna to receive power. Earth planes restricting the radiation path of the antenna will also

have the same effect.

The best range will be achieved with either a straight piece of wire, rod or PCB track @ ¼ wavelength (15.5cm

@ 433.9MHz). Increased range may be achieved if this ¼ wave antenna is placed perpendicular to and in the

middle of a solid earth plane measuring at least 16cm radius. In this case, the antenna should be connected

to the module using 50 Ohm coaxial cable and the PCB track layout tips given above should be observed.

RF RF

Helical A ntenna Whip A ntenna

34mm @ 433MHz

17 tur ns equally spaced

∅

= 5mm (insi de)

15.5cm @ 433MHz

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

5 Technical Specifications

Electrical Characteristics

Min. Typ. Max. Units Notes

DC Levels

Supply voltage 1.9 3.3 3.6 V 1

Supply current (Transmit mode) 11 30 mA

Supply current (Receive mode) 12.5 mA

Supply current (Standby mode) 125 uA

Data input/output high Vcc–0.3 Vcc+0.3V V

Data input/output low 0 0.3 V

RF

430.0 440.0 MHz 2 Working frequency: 433MHz Module

868MHz Module 860 880.0 MHz 2

Receiver sensitivity -100 dBm

Transmitter RF power out +10 dBm

Frequency deviation +/- 50 kHz

GFSK manchester encoded data rate 100 kbps

Operating temperature -20 +80 Deg C

Storage temperature -40 +100 Deg C

Dynamic Timing

Power up to stable receiver data out 30 mS

Power up to full RF out 30 mS

Standby to Receive mode 1 mS

Standby to Transmit mode 1 mS

Notes

1. Supply voltage should have <10mV ripple.

2. The application operating frequency must be chosen to comply with the Short Range device

regulation in the area of operation.

5.1 Mechanical Detail

Pin Pitch: 2.54mm Module Pitch: 22.86mm

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

6 Evaluation Board

• Direct RS232 Interface to PC

• Accepts 433 or 868MHz Modules

• Easy configuration with downloadable

software tool

• LED Indication of transmission

• Accepts a range of Antenna Sockets

• Supply Voltage 5 - 12Vdc

The RF650 evaluation board provides a reliable proven host board for development with the RF650

module. A single board is supplied, no RF650 module is included with the board and the antenna socket

is not fitted. This enables the board to be used for either the 433MHz or 868MHz module with a range of

antenna socket types.

6.1 Connections

6.1.1 Power

The evaluation board requires a 5 - 12Vdc power source. The maximum operational supply current is <50mA.

Power is applied to the two way screw terminal labelled ‘CN1A_B.’ The left hand side of the screw terminal is

GND (nearest the DB9 connector).

6.1.2 RS232 Connector

The RF Modem interfaces to the host computer via an RS232 connection using a standard DB9 connector as

shown in the diagram below.

8

3

2

20

7

6

4

5

22

1

2

3

4

5

6

7

8

9

PC Seria l Port

DTE

(DB25)

RF Modem

DCE

(DB9F)

Tx

Rx

DTR

GND

RTS

CTS

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

PC Serial Port

DTE

(DB9)

RF Modem

DCE

(DB9F)

Tx

Rx

DTR

GND

RTS

CTS

Tel 01273 898000 Fax 01273 480661

SMART RADIO TRANSCEIVER RF650

6.2 Mechanical Details

6.3 DIP Switch Configuration

DIP Switch Name Type Description

1 PD (Power Down) In OFF : Power Down mode; ON : Operating mode.

2,3 Data Rate In Host Data Rate selection (see next table).

4 Configuration In OFF : Configuration mode; ON : Operating mode.

5 RTS In

6 CTS Out OFF, OFF : RTS,CTS Disabled (RS232 without handshake);

ON, ON : RTS,CTS Enabled (RS232 with handshake).

6.3.1 Host Data Rate Selection

DR1 (SW2) DR2 (SW3) Baud Rate

OFF OFF 4,800

ON OFF 9,600

OFF ON 19,200

ON ON 38,400

RF Solutions Ltd.,

Unit 21 Cliffe Industrial Estate,

South Street, Lewes, E Sussex,

BN8 6JL. England

Tel +44 (0)1273 898 000 Fax +44 (0)1273 480 661

Email sales@rfsolutions.co.uk http://www.rfsolutions.co.uk