Western Reserve Controls 1782-JDC Instrukcja Użytkownika Pobierz pdf (Strona 30)

Western Reserve Controls 1782-JDM User’s Manual

PUB 24.0

Problem: JDM operates on DeviceNet but does not seem to handle ModBus activity.

Possible Solutions:

1. Check the RX and TX LEDs on the JDM. A successful transmission will appear as:

• Brief TX LED flash

• Brief RX LED flash

• Both LEDs off

If the sequence does not appear as this, then there is a wiring problem.

2. If this is an RS485 link, make sure it is properly terminated. (121ohm resistor at each

end.)

3. Make sure the TX and RX, or SIG+ and SIG-, are not crossed.

4. Make sure your signal commons are connected.

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Western Reserve Controls 1782-JDC Instrukcja Użytkownika Strona 30