The WRT is a Wireless data transmission device designed
to receive and transmit RS485 data packets. The product
is factory configured for Modbus RTU protocol. Each data
producing point (slave)can be connectedto oneWRTdevice,
and transmits the data to a second unit, which is connected
to the network master. Several slave data producers can be
connected together, to one WRT. Up to 99 slave units can
transmit to one master, and the units can be configured so
one network master can communicate with another network
through that network’s master.
Description
Installation
Configuration
1. No network communication
A. Check for node power. Confirm that the LEDs are
on: Green, Red, Orange. Check power source switch
position on the back of the node.
B. Cycle the power to clear from stand-by condition.
C. Check network wire connections, reverse + and-
D. Possible signal is blocked. Add another node or
E. Be sure that Node ID, channel selection and group ID
switch settings are correct. Each node must be unique
to the network and the same as user equipment ad-
dress. Master ID must be 0.
F. Check to be sure node and user equipment are set for
the same protocol (Modbus RTU).
Trouble Shooting
Power Wiring
Connect external source 4.0 to 6.0 VDC to terminal block,
or use 3.3 to 6.0 VDC produced by AC adaptor, remove
supplied plug and strip wires to terminate onto the radio
block.
Output Wiring
Connect control or monitoring wires to the sensor. Strip
the insulation back approximately 3/8 inch (10mm). If
solid wire, no tool is needed, just insert the wire into
terminal 7 (+) or terminal 8 (-) and the signal ground (6).
Terminals 3,4 and 5 are not used. Wire should be 24-16
AWG, 30 meters maximum. If using stranded wire, use a
small screwdriver to release the terminal securing block,
allowing for wire insertion.
Unit Switch
(RF-CH) Radio
Channel Frequency
0 11 ch 2405 MHz
1 12 ch 2410 MHz
2 13 ch 2415 MHz
3 14 ch 2420 MHz
4 15 ch 2425 MHz
5 16 ch 2430 MHz
6 17 ch 2435 MHz
7 18 ch 2440 MHz
8 19 ch 2445 MHz
9 20 ch 2450 MHz
A 21 ch 2455 MHz
B 22 ch 2460 MHz
C 23 ch 2465 MHz
D 24 ch 2470 MHz
E* 25 ch 2475 MHz
F* 25 ch 2475 MHz
* Note both positions E and F set channel 25
Each node in a networks will use the same channel
Node ID: Master is always
set to ID “0”, slave units set
to a value between 1 and 99.
One transceiver must be set
as the master and at least one
as a slave to the master.
Group ID: Select the same
group ID for all nodes on a
network. Contact factory for
other configurations.
Use 5VDC externalpower supply, and
bond the Modbus equipment ground
to the same ground as power supply.
If using an AC wall-type adaptor, re-
move supplied cord end and strip the
cord wires for termination on radio
block. Set this switch to “TERM”
position.
The WRT unit must be installed indoors or outdoors in
a suitable non-metallic enclosure. Each unit requires a 5
VDC power supply, and will need to be configured for
network address, channel frequency and group ID. The
radio can be screwed to a back panel or hung on a wall
with a nail or screw.
Back side of WRT
Set the node (radio) address
to the same value as the data
input device. If an address
higher than 99 is required,
contact the NK factory.
