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 Power: 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)
注: Each wireless transceiver includes 1/2 wave antenna, 110 Vac adaptor, 1.8m(6ft) RS-232 cable with DB9F termination. *Additional antennas are availalble. Contact the Data Acquisition Engineering Department.
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