Technical data

Hardware Information

6-15

SIMATIC Panel PC 670 Computing Unit Equipment Manual

Edition 12/01

Serial port COM1 (PLC/V24/Modem)

The serial port (COM 1) on the computing unit is assigned as follows:

Connector Pin

No.

Short

Name

Meaning Input

Output

2 TxD (D1) Serial transmission data Output

3 RxD (D2) Serial received data Input

4 RTS (S2) Request to send Output

5 CTS (M2) Clear to send Input

6 DSR (M1) Data set ready Input

7 GND (E2) Station ground (reference

potential)

8 DCD (M5) Data carrier detect

(carrier)

Input

9 +TTY RxD TTY receive Input

10 -TTY RxD TTY receive Input

18 +TTY TxD TTY send Output

19 +20mA Floating current source -

20 DTR (S1) Data terminal equipment

ready

Output

21 -TTY TxD TTY send Output

22 RI (M3) Incoming call Input

1 - Shield -

11-17 - Not assigned -

23-25 - Not assigned -