Wireless Transceiver with Modbus Interface for OMWT Series Wireless Transmitters


Wireless Transceiver with Modbus Interface for OMWT Series Wireless Transmitters | OMWT-XREC-MOD

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  • RS-485 Master/Slave Auto-Sensing Radio Interface
  • Receives Data from OMWT-REP-900 Wireless Repeater
  • Provides Remote Capability to RS-485 Modbus Networks
  • Built-in 900 MHz Frequency Hopping Radio for Long-Range Wireless Interface
  • Multiple Radios Allow Many Remote RS-485 Networks to Coexist Logically


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The OMWT-XREC-MOD Wireless Transceiver uses an embedded 100-milliwatt frequency hopping wireless modem that provides communication between a local RS-485 network and a remote network of RS-485 connected devices. The OMWT-XREC- MOD will automatically sense the direction of data flow and switch the RS-485 and radio devices accordingly. The OMWT-XREC-MOD can be placed in a network of RS-485 devices and appear as a slave repeater of remote RS-485 devices or it can be placed in a network of one or many RS-485 slaves and act as the RS-485 repeater of a remote master. The radio operates within the 900 MHz ISM Band under Part 15 of the FCC Rules and regulations.

The OMWT-XREC-MOD operates at 19200 Baud at either odd parity or no parity. Dip switches select parity and one of 7 radio networks. Radios operating together must have the same radio network address (1-7 set by switches labeled A0-A2). Select a different radio network address to prevent interference from nearby networks that are not sharing information. The default radio network for roof-top applications is 5. The user may choose another network address (1-7) if desired. While all radios in a network must have the same network address they do not have to have the same parity; the parity is local to the RS-485 serial port on the OMWT-XREC-MOD only. Parity information is not transmitted or received.

Radio network selection 0 (A0, A1, A2 all set to 0) selects a special network setup. When network address setting 0 is selected the pre-programmed radio network parameters are used; these parameters are user and application specific and must be set at the factory for specific applications.

The OMWT-XREC-MOD can also be used as a general purpose RS-485 half duplex radio interface operating at 19200 baud at either odd or no parity (dip switch selectable).

The OMWT-XREC-MOD is supplied standard with a 1/2 wave monopole antenna. For longer distance outdoor use, optional Omni-Directional and YAGI directional line-of-site antennas are available.

Frequency Range: 902 to 928 MHz, unlicensed ISM Band
Type: Frequency hopping spread spectrum transceiver
Frequency Control: Direct FM
Transport Protocol: Transparent networking
Network Topology: Multi-drop
Channel Capacity: Hops through 25 channels,
up to 65,000 NetIDs
Serial Data Interface: Asynchronous (RS-232)
CMOS (TTL) signals, 5V, 3.3V tolerant
I/O Data Rate: 9600 baud
Channel Data Rate:
10K bps at 9600 baud
Transmit Power Output: 100 mW
Rx Sensitivity: -110 or -107 respectively
Transceiver Range Indoor
(with Standard 1/2 Wave Monopole Antenna):

180 to 450 m (600 to 1500'), 900 MHz;
Transceiver Range Outdoor
(With Optional Omni-Directional Antenna):

Up to 11 km (7 mi), 900 MHz
Transceiver Range Outdoor
(with Optional YAGI Antenna):

Up to 32 km (20 mi), 900 MHz
Interference Rejection:
70 dB at pager and cellular phone frequencies
5 Vdc ±0.3V, 170 mA nominal transmitting,
50 mA nominal receiving
Operating Temperature:
0 to 70°C (32 to 158°F)
Storage Temperature:
0 to 70°C (32 to 158°F)
Operating Humidity:
10 to 90% RH non-condensing
Dimensions (without antenna):
70 H x 127 W x 35 mm D
(2.75" x 5.00" x 1.375")
Weight: 142 g (5 oz)
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