Report Modbus programming in Projects seeking Programmers Posted October 27, 2020 6 hours ago, ORSO2001 said: dear TJ, some not clear info from you...I mean...you wrote about ModBus TCP but the document attached report, for these devices, ModBus RTU by RS485...have you a gateway in the middle? My apologies, this set up on the down stream device is modbus RTU, however, it uses a rj45 connection. We would be using a gateway RTU -> TCP into the PLC/HMI combo. Here is the long and short of it. We currently get this set up from a supplier. It takes them 8+ weeks to get one out to us. I figured if we can get a scalable program set up, delivery times would decrease considerably. Thus, making for a happier customer.