Posted 7 Oct 2022 Hi everybody I am using CpP1E plc Wich as you know, has rs232, rs485 and peripheral ports. Actually I use the RS485 port for a HMI network. Also, I need to make another modbus network to transfer some binary signals (a fault module) to the plc. So, can I use the RS232 port of the plc at the same time as the master device? Thank you in advance Share this post Link to post Share on other sites