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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 applications
• Easy to integrate
• Ideal for battery powered devices
• RoHS Compliant
900 MHz
FHSS
Transceiver
Module
WIT910M2 transceiver modules are designed to transmit serial data using highly robust 900 MHz
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 multipath 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.
Shown with shield removed
General Specifications
RF Frequency
Radio Certifications
Operating Range
Network Topologies
Network Protocol
Error Detection and Correction
Serial Data Interface
Serial Data Rate
Channel Data Rate
Number of Frequency Channels
RF Bandwidth
Transmit Power Output
Receiver Sensitivity
Supply voltage
Current Consumption
29 dBm Transmit Power,
57.6 kb/s Serial Data Rate
Size
Weight
Operating Temperature
Humidity
902 to 927 MHz
FCC Part 15, Canadian RSS-210
Indoor - 1000 ft, Outdoor - more than 20 miles with omni-directional antenna
Point-to-point and point-to-multipoint (star)
High remote capacity CSMA with option for limited TDMA
24-bit CRC and ARQ
Asynchronous (UART) CMOS signals, 3.3 V, 5 V tolerant
up to 115.2 kb/s, software selectable
172.8 kb/s
54
460 kHz
10, 20, 27 or 29 dBm, software selectable
-103 dBm for 10-5 BER
3.3 to 10 V for up to 27 dBm transmit power, 5 to 10 V for 29 dBm transmit power
Remote
Sleep
Operation: Standby
Receive
Transmit
80.2 x 46.5 x 8.6 mm
35 g
-40 C to 70 C
20% to 90% (non-condensing)
250 µA
43 mA
100 mA
800 mA
Base Station
Operation:
Receive
Transmit
125 mA
800 mA
www.RFM.com E-mail: info@rfm.com
©2008 by RF Monolithics, Inc.
Page 1 of 2
WIT910M2 - 6/5/08
Long Operating Range
With 29 dBm of transmit power and a receive sensitivity of -103 dBm, the WIT910M2 can achieve ranges in excess of 20 miles using
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 powerful performer at low power, consuming only 100 mA at 3.3 volts. With the same size and mounting dimensions of the
industry-leading WIT2410M4G module, the WIT910M2 can be used in place of the WIT2410M4G in existing designs, creating 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 multipath fading. Using a 24-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 measure of security. Reliable operation is assured through RFM’s stringent QA processes. All WIT910M2s are manufactured in 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.
Connector Pinout
Pin
1
2
3
4
5
6
7
8
10
16
Signal
Gnd
TxD
RxD
CFG
RTS
Sleep/DTR
DCD
CTS
Power Down
Vcc
Type
-
Input
Output
Input
Input
Input
Output
Output
Input
Description
Signal and chassis ground
Data input to be transmitted
Received data output
Configuration select, used to switch radio between data and control mode
Request to send input, used for receive flow control by the host
Module sleep/DTR input, sleep is active high
Data carrier detect, indicates FHSS synchronization on remotes
Clear to send output, used for receive flow control by the radio
Low power mode input, active low
Positive supply - minimum 3.3 V, 5 V minimum for 29 dBm transmit power, maximum 10.0 V
Physical Specifications - dimensions in inches (mm)
COUNTERSINK AND CLEARANCE HOLE FOR
PIN 1
.135 [3.43]
#2-56 [2.0 X 0.4] FLATHEAD SCREW. (2 PLCS)
RF CONNECTOR
.21 [5.3]
1.83 [46.5]
1.69 [42.9]
.74 [26.1]
1.48 [37.6]
13 [3.3]
.34 [8.6]
.21 [5.3]
1.69 [42.9]
3.16 [80.2]
.13 [3.3]
www.RFM.com E-mail: info@rfm.com
©2008 by RF Monolithics, Inc.
Page 2 of 2
WIT910M2 - 6/5/08
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