The communication module has the following features:

• Rugged plastic housing
• LEDs for displaying “Send”, “Receive” and “Error”
• Communication interface

It is available in three versions with different transmission physics:

• RS 232C (V.24)
• 20 mA (TTY)
• RS 422/RS 485 (X.27).

Drivers

Drivers with differing load capabilities are available for the CP 341:

• Modbus:
  for communication according to the Modbus protocol with RTU format:
  • Modbus master:
    master-slave interfacing with SIMATIC S7 as master.
  • Modbus slave:
    master-slave interfacing with SIMATIC S7 as slave, message frame traffic from slave to slave not possible.