Hi all,
I use an Auto 485 to connect to my T100MD888 plc for downloading and monitoring purposes while at the same time I connect my PC to the RS232 com port of the PLC for MODBUS comms generated by DAQFactory.
This is allows me to online monitor while the PC and PLC comms are active, which is great for development and debugging. Unfortunately the 485 coms are sporadic at best and while I can connect and monitor, the monitoring updates are not continuous and I will lose connection typically in < 10s or the connection freezes and takes 10s plus to re-establish.
This happens even when the PC is not sending MODBUS requests, interestingly however I always seem to be able to transfer programs through 485 without any problems.
FYI, as the PC has no comm ports I am using a usb-232 converters for both channels.
Any ideas what the problem may be?