### External Device Settings

##### RS-422/485 Communication Port Settings

To set the External Device's RS-422/485 communication port to half-duplex communication, set the jumper (for TC3-01) or DIP Switch (for TC8-00) as follows.

Refer to your External Device manual for details.

- Setup Description

CPU | Jumper/DIP Switch | Setting
--- | --- | ---
TC3-01 | JP15, between pins 2 and 3 | Short
JP3 | Short
JP4 | Short
TC8-00 | SW5-1 | OFF
SW5-2 | OFF
SW5-3 | ON
SW5-4 | ON
SW5-5 | ON

##### Register Settings for RS-422/485 Communication

Use the ladder software (TCPRGOS-W (E)) to set up RS-422/485 communication.

Refer to your External Device manual for details.

After setup is complete, restart the External Device to enable the settings.

##### Procedure

1. On the computer, start the ladder software.

2. From the [Tool] menu, select [Register editor].
   The [Register data] window appears.

3. Set the register as follows.

Double-click [HEX] in the register column and enter the value in the [Data change] dialog box.

CPU | Register | Setting
--- | --- | ---
TC3-01 | D11F | 0004h
TC8-00 | D37F | 8004h

NOTE

- The following items are fixed. The communication speed is set automatically.

Setting Information | Value
--- | ---
Communication Type | RS-422/485 (2wire)
Data Length | 8 bit
Parity | None
Stop Bit | 2 bit

NOTE

- For TCmini series to run RS-422/485 (2 wire) communications, one of the following CPU versions or later is necessary.
  TC3-01 (Version: TCmini LT3CU01D1)
  TC8-00 (Version: TCmini LT8CU00A0)