AB7702B no Serial Link Light

Hello,

I have an Anybus 7702-B / MB100 that I am interfacing to a Modbus RTU RS485 Gateway. I have verified data output from my RS485 Gateway up to the Anybus with Modscan32.

I have configured the Modbus settings of the Anybus to match those of the Modbus RS485 gateway and the settings used for Modscan, but I do not get a Serial Link light on the Anybus. I have attached screenshots of the configuration here. Swapping polarity of the RS485 A and B signal lines and using a 120ohm termination resistor has had no effect.

2021-01-18_14-21-00

Hello,
Do you have anything sending requests though on the TCP side? They should be directed at the IP of the gateway then the Node ID of the serial device. The status counters showing 0 indicate it hasn’t had any modbus requests.

Deryck

Hey Deryck,

Thanks, I was overlooking that step, I connected to the TCP side with Modscan32, pointed it to the Modbus slave and the data is showing up perfectly…

Great! looks like it is working correctly now!
Have a great week.

Deryck