The CM 1241 communication modules have the same design features as the basic devices.

• Installation on DIN rails:
  The modules are snapped onto the rail next to the CPU on the right and are electrically and mechanically connected to each other and to the CPU by the integral slide mechanism.
• Direct installation:
  Horizontal or vertical mounting on DIN rail or direct mounting in the cabinet using integral lugs.

The communication modules are equipped with the following:

• Status LEDs for indicating “Send”, “Receive” and “Error”
• Communication interface:
  available for the RS232 or RS422/485 physical transmission properties