Polling through a DIGI One IAP; Modbus TCP/IP. Slaves are connected RS485, Modbus RTU, port 1. I could not get this to work in the shop, but I’m not sure if it was the DIGI since Siemens and Modbus don’t seem to play well together. I’m using the embedded port on the processor.
Are you trying to do 2 wire RS-485 or 4 wire RS-485?
Hi,
Igot the same problem with an Triconex - Invensys.
the Triconex are the slave with Modbus/TCP and an Hoeywell TDC3000 are the Master with Modbus/RTU i’am using 2 wire RS-485 half duplex, conected to port 1, screw-term.