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©2008 by RF Monolithics, Inc. WIT910M 2 - 6/5/08
DEVELOPER KI T
(Info: click here)
General Specifications
RF Frequency 902 to 927 MHz
Radio Certifications FCC Part 15, Canadian RSS-210
Operating Range Indoor - 1000 ft, Outdoor - more than 20 miles with omni-directional antenna
Network Topologies Point-to-point and point-to-multipoint (star)
Network Protocol High remote capacity CSMA with option for limited TDMA
Error Detection and Correction 24-bit CRC and ARQ
Serial Data Interface Asynchronous (UART) CMOS signals, 3.3 V, 5 V tolerant
Serial Data Rate up to 115.2 kb/s, software selectable
Channel Data Rate 172.8 kb/s
Number of Frequency Channels 54
RF Bandwidth 460 kHz
Transmit Power Output 10, 20, 27 or 29 dBm, software selectable
Receiver Sensitivity -103 dBm for 10-5 BER
Supply voltage 3.3 to 10 V for up to 27 dBm transmit power , 5 to 10 V for 29 dBm transmit power
Current Consumption
29 dBm T ransmit Power,
57.6 kb/s Serial Data Rate
Remote Sleep 250 µA Base Station Receive 125 mA
Operation: S tandby 43 mA Operation: Transmit 800 mA
Receive 100 mA
Transmit 800 mA
Size 80.2 x 46.5 x 8.6 mm
Weight 35 g
Operating Temperature -40 C to 70 C
Humidity 20% to 90% (non-condensing)
900 MHz
FHSS
Transceiver
Module
WIT910M2
Features:
• Fast wireless serial data transmission
• Robust 900 MHz frequency hopping
spread spectrum technology
• More than 20 mile outdoor range with
omni-directional antennas
• 3.3 volt operation, low power
consumption
• Small size, light weight
• Certified for unlicensed operation in the
USA and Canada
Benefits:
• Suitable for point-to-point and point-to-
multipoint networks
• Supports large number of nodes
• High immunity to interference and
multipath fading
• Supports long range applica t ion s
• Easy to integrate
• Ideal for battery powered devices
•RoHS Compliant
Shown with shield removed
WIT91 0M2 transc eive r modul es are d esign ed to tra nsmi t serial dat a usin g high ly robu st 900 M Hz
frequency hopping spread spectrum (FHSS) technology. WIT910M2 modules employ RFM’s
beacon- synchronized CSMA at an RF data rate of 172.8 kb/s to support a high number of remotes.
WIT910M2 transceivers are suitable for both point-to-point and point-to-multipoint networks. FHSS
technology provides strong immunity to both interference and multip ath fading. The small size, light
weight and low power consumption of these transceiver modules make them suitable for a wide
variety of applications. WIT910M2 modules are certified for unlicensed operation in the USA,
Canada, Australia, Israel and New Zeland.
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©2008 by RF Monolithics, Inc. WIT910M 2 - 6/5/08
Connector Pinout
Pin Signal Type Description
1 Gnd - Signal and chassis ground
2 TxD Input Data input to be transmitted
3 RxD Output Received data output
4 CFG Input Configuration select, used to switch radio between data and control mode
5 RTS Input Request to send input, used for receive flow control by the host
6 Sleep/DTR I nput Module sleep/DTR input, sleep is active high
7 DCD Output Data carrier detect, indicates FHSS synchronization on remotes
8 CTS Output Clear to send output, used for receive flow control by the radio
10 Power Down Input Low power mode input, active low
16 Vcc Positive supply - minimum 3.3 V, 5 V minimum for 29 dBm transmit power, maximum 10.0 V
PIN 1
.21 [5.3]
1.69 [42.9] 3.16 [80.2] .13 [3.3]
1.69 [42.9]
1.83 [46.5]
1.48 [37.6]
.135 [3.43]
COUNTERSINK AND CLEARANCE HOLE FOR
#2-56 [2.0 X 0.4] FLATHEAD SCREW. (2 PLCS)
.34 [8.6]
13 [3.3]
RF CONNECTOR
.21 [5.3]
.74 [26.1]
Long Operating Range
With 29 dBm of trans mit p ower an d a rece ive sen sitiv ity o f -103 dBm, the WI T910M 2 can achi eve ranges in exc ess of 20 mile s usin g
3 dBi omni-directional antennas. When long range isn’t needed, the WIT910M2, measuring just 80.2 x 46.5 x 8.6 mm and weighing just
35 grams, is a powe rful performer at lo w power, consuming only 100 mA at 3.3 volt s. With the same size and moun ting dimens ions of the
industry-l eading W IT2410M4G module , the WIT9 10M2 can be used in place o f the W IT2410M4G i n existi ng desig ns, creat ing a 900 MHz
product with little development effort.
Reliable
The WIT910M2 provides both reliable communication and reliable operation. Using robust frequency hopping spread spectrum
technology, the WIT910M2 provides immunity to jamming as well as immunity to multip ath fading. Using a 2 4-bit CRC for error detection,
automatic retransmit request (ARQ) and a 512 byte data buffer , error-free transparent communication is automatic. Built-in data scrambling
adds a meas ure of security. Relia ble operation is assured throug h RFM’s stringent QA pro cesses. All WIT 910M2s are ma nufactured i n an
ISO9000 certified facility.
Simple
Simple to integrate and use, the WIT910M2’s default parameter settings work for most applications. For other applications, software
control makes changing parameter settings easy. The WIT910M2, with its small size and low power consumption, is simple to integrate
into your product. The WIT910M2’s RS-232 style interface with standard 3.3 volt CMOS signal levels makes integration easy. Since
WIT910M2 modules are certified for license free operation, your WIT910M2 based product does not have to repeat radio regulatory
approval.
Versatile
WIT910M2 operating parameters are configurable under software control. Even the transmitter power level can be selected using a
straight- forward command set. Both point-to-point and point-to-multipoint modes are supported. Baud rates from 1.2 to 115.2 kb/s are
provided for serial communication between a WIT910M2 and its host.
Physical Specifications - dimensions in inches (mm)
