Siemens PC 670 manual Serial interface COM1 AG/V24/Modem, Pin No Short Name Meaning Input/Output

Release 04/02 Hardware Information

Serial interface COM1 (AG/V24/Modem)

The serial interface (COM 1) of the computing unit is assigned as follows:

1

14

1325

Figure 7-1 Serial interface COM1 (female)

Pin No.	Short Name	Meaning	Input/Output
1	-	Shield	-
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)	Functional ground (reference	-
		potential)
8	DCD (M5)	Data carrier detect (carrier)	Input
9	+TTY RxD	TTY receive	Input
10 - 17	-	Not assigned	-
18	+TTY TxD	TTY send	Output
19	+20mA	Isolated current source	-
20	DTR (S1)	Data terminal equipment ready	Output
21	-TTY TxD	TTY send	Output
22	RI (M3)	Incoming call	Input
23-25	-	Not assigned	-

Panel PC 670 Computing Unit, Equipment Manual 7-11