Siemens PC 670 用户手册

7-12

Panel PC 670 Computing Unit, Equipment Manual

The serial interface (COM2) of the computing unit is assigned as follows

1

5

6

9

Figure 7-2

Serial interface COM2 (male)

1

DCD (M5)

Data carrier detect

Input

2

RxD (D2)

Received data

Input

3

TxD (D1)

Transmission data

Output

4

DTR (S1)

Data terminal equipment
ready

Output

5

GND (E2)

Station ground

-

6

DSR (M1)

Data set ready

Input

7

RTS (S2)

Request to send

Output

8

CTS (M2)

Clear to send

Input

9

RI (M3)

Incoming call

Input