### External Device Settings

For External Device communication settings, use the SEL key, UP key, or DOWN key located in the operation area on the front of the controller.

Refer to your External Device manual for details.

1. Press and hold SEL key to display the 3rd block parameter.

2. Press UP key or DOWN key to display setting parameter.

3. Press SEL key.

4. Press UP key or DOWN key to display setting value.

5. Press SEL key.

6. Press and hold SEL key.

##### Setting Value

Setting Parameter | Setting Value | Setup Description
--- | --- | ---
STno | 1 | Station No.
CoM | 0 | Parity setting
PCoL | 1 | Communication protocol

NOTE

- The PXR CPU type can be connected with RS-422/485 (2-wire) when the 11th digit of model number includes the following codes:
  M (RS-485 Modbus interface)
  V (RS-485 Modbus interface + Digital input 1 point)

NOTE

- PXR4 Socket type cannot be connected because it lacks a serial port option.

NOTE

- PRX4 (AutoFIX) is the CPU unit released in July 2001 or later.

NOTE

- PRX4 (NoAutoFIX) is the CPU unit released in June 2001 or earlier.