Modbus is an industry-adopted communication protocol based on RTU, ASCII, and TCP protocols for various applications; these three protocols are commonly used by various equipment in the industry, such as DCS, PLC, HMI, Power meters, various sensor and measuring instruments.

The SC10E4 M Series support 16 simultaneous TCP master and 32 simultaneous requests for each TCP master.
Each RS232/485/422 serial port can be individually configured for Modbus RTU or Modbus ASCII, Master or Slave or even different baud rate.