Siemens SIMATIC PC 670 Equipment Manual page 143

Release 04/02
Serial interface COM1 (AG/V24/Modem)
The serial interface (COM 1) of the computing unit is assigned as follows:
Figure 7-1
Pin No.
1
2
3
4
5
6
7
8
9
10 - 17
18
19
20
21
22
23-25
Panel PC 670 Computing Unit, Equipment Manual
1
14
25
13
Serial interface COM1 (female)
Short Name Meaning
- Shield
TxD (D1) Serial transmission data
RxD (D2) Serial received data
RTS (S2) Request to send
CTS (M2) Clear to send
DSR (M1) Data set ready
GND (E2) Functional ground (reference
potential)
DCD (M5) Data carrier detect (carrier)
+TTY RxD TTY receive
- Not assigned
+TTY TxD TTY send
+20mA Isolated current source
DTR (S1) Data terminal equipment ready
-TTY TxD TTY send
RI (M3) Incoming call
- Not assigned
Hardware Information
Input/Output
-
Output
Input
Output
Input
Input
-
Input
Input
-
Output
-
Output
Output
Input
-
7-11