User`s manual

Western Reserve Controls 1782-JDM User’s Manual

PUB 24.0

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 , an RS-485 network, using a 2-wire half-duplex differential signal between the devices, or an RS-

422 5-wire full-duplex link.

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 or 5-point terminal plug provided. See

Table 2.2 and 2.3 below.

4. Turn on power to the ModBus device.

Table 2-2 RS-232/485 Connector Signals

Pin # RS232

Signal

RS485

Signal

Designator

1 Receive Signal - RX/SIG-

2 Transmit Signal + TX/SIG+

3 Ground Ground GND

Table 2-3 RS-422 Connector Signals

Pin # Designator

RS422

Signal

5 TX- Transmit -

4 TX+ Transmit +

3 GND Ground

2 RX- Receive -

1 RX+ Receive +