Specifications

Hardware Information

7-10

SIMATIC Box PC 620 Manual

A5E00131465-01

Serial Port COM1 (PLC/V.24/Modem) *

The serial port (COM 1) on the Box PC has the following pinout:

Figure 7-1 COM 1 Serial Port (Socket Connector)

Pin No.

Designation Description Input /Output

1 - Shield -

2 TxD (D1) Serial transmit data Output

3 RxD (D2) Serial receive 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) Functional ground

(reference potential)

8 DCD (M5) Data carrier detect Input

9 +TTY RxD TTY receive Input

10 - 17 - Unassigned -

18 +TTY TxD TTY send Output

19 +20mA Isolated current source -

20 DTR (S1) Data terminal ready Output

21 -TTY TxD TTY send Output

22 RI (M3) Incoming call Input

23-25 - Unassigned -

* The line current (TTY) interface is an optional product feature.