Technical specifications
9.4 Interface description
SIMATIC Field PG M6
Operating Instructions, 12/2018, A5E43198909-AA
85
RS232/TTY (COM1)
Pin no.
Short designation Meaning
Input/output
1
-
Shielding
-
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)
Ready for operation
Input
7
GND (E2)
Functional ground (reference po-
tential)
-
8
DCD (M5)
Data carrier detect
Input
9
+TTY RxD
Current loop receive
Input
10-17
-
Not assigned
-
18
+TTY TxD
Current loop send
Output
19
+20 mA
Potentially isolated power source
-
20
DTR (S1)
Data terminal ready
Output
21
-TTY TxD
Current loop send
Output
22
RI (M3)
Incoming call
Input
23-25
-
Not assigned
-
Gender changer for COM1
With the gender changer (25-pin / 9-pin) the COM1/V.24/AG port can be converted to the
usual 9-pin male connector. For this, you only have to plug the adapter onto the COM1
socket and secure it with the two hexagonal head screws.
The V.24 and TTY ports of the COM1 can be used alternatively.
