User`s manual

Western Reserve Controls 1782-JDM User’s Manual
PUB 24.0
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2. Switch setting changes do NOT take effect until the device is reset with either a device RESET
command (to the class 1 Identity object) or a power cycle.
2.2 How to Change the DeviceNet Baud Rate
1. The baud rate defaults to autobaud. You can change the baud rate in software to a fixed baud rate using
your configuration tool or an explicit message to Set Class 3 (DeviceNet Class), Instance 1, Attribute 2
to 1 (125k), 2 (250k), or 3 (500k), from the Master.
2. If you change the baud rate, the new baud rate will not become effective until the unit is power cycled or
a Reset command is issued to the JDM from the Master.
2.3 How to Install the Modbus Device Network
1. The communication between the Modbus device(s) and the 1782-JDM is an RS-232 3-wire full-duplex
link or an RS-485 network, using a 2-wire half-duplex differential signal between the devices.
2. Connect an appropriate cable to your Modbus device. See your Modbus device users manual for details.
3. Connect the other end of the cable to the JDM using the 3-point terminal plug provided. See Table 2.2
below.
4. Turn on power to the Modbus device.
Table 2-2 JDM Serial Port Connection
Pin # RS232
Signal
RS485
Signal
Designator
1 Transmit Signal + SIG+
2 Receive Signal - SIG-
3 Ground Ground GND