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Appendix Chapter 13

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RS232/485 interface

Options for using the serial interface include transparent data transfer, control of

connected devices or operation of the unit with a terminal program. Depending

on the setting, the interface works with the RS232 or RS422/485 protocol. The

protocol used depends on the current configuration (see page 56).

The pin assignments depend on the protocol used.

Note

For RS422/RS485 pin assignment is also possible for 2-wire connection.

– Connect the TxD+ with the RxD+. TxD+ then is equivalent to DATA+.

– Connect the TxD- with the RxD-. TxD- then is equivalent to DATA-.

Pin RS232 Protocol RS422/485 Protocol

1– –

2 RxD (receive data) RxD+ (receive data plus)

3 TxD (transmit data) TxD- (transmit data minus)

4– –

5 GND (ground) GND (ground)

6– –

7 RTS (ready to send) TxD+ (transmit data plus)

8 CTS (clear to send) RxD- (receive data minus)

9– –

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 121 122

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