Siemens SIMATIC S7-1200 CP 1243-8 IRC - Page 199

Accessories
C.1 TS modules
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
199
Properties
The TS Module RS232 has a COM interface for connection of an external modem.
The COM interface, a 9-pin RS232 plug connector, is located behind the lower front panel.
You can operate the following devices from the COM port:
● Standard modems
● ISDN terminal adapters
● GSM wireless modems with an RS232 port
Note
The specifications relating to interference immunity and interference emission apply only
when using devices, lines and connectors conforming to industrial requirements in
accordance with EN 61000
-6-4:2001 and EN 61000-6-2:2001.
Pin assignment and signal description of RS232 port
The RS232 plug connector has the following pin out:
Pin no.
Short de-
scription
Meaning
Input / out-
put
1 DCD Received signal level - the DCE reports the receipt of a car-
rier or the connection establishment to the DTE.
1
,
2
Input
2
RXD
Received data - from DCE to the DTE
Input
3
TXD
Transmit data - from DTE to DCE
Output
4
DTR
Ready to send - the DTE signals this to the DCE.
Output
5
GND
Internal reference ground
6 DSR Ready to operate - the DCE signals this to the DTE. Input
7 RTS Request to send - the DTE requests the DCE to transmit
data on the data cable. The DTE waits for the CTS (ready-to-
send) signal from the DCE.
Output
8 CTS Ready to send - the DCE is able to transfer the data incom-
ing from the DTE.
Input
9
-
-
-
Schirm
-
On connector housing
-
;
1
DCE = data communication equipment Modem or ISDN-TA
;
2
DTE =data terminal equipment CP (or TS adapter)