Siemens Simatic PC Panel PC 870, Equipment Manual

Page: 102 / 154

Hardware Information Release 11/02
7-8
SIMATIC Panel PC 870 Computing Unit, Equipment Manual
Serial port COM1 (PLC/V24/Modem), X30
The serial port (COM 1) on the computer unit is assigned as follows:
Connector Pin
No. Short
Name Meaning Input /
Output
1 – Shield –
2 TxD (D1) Serial send data Output
3 RxD (D2) Serial receive data Input
4 RTS (S2) Request To Send Output
1
14 5 CTS (M2) Clear To Send
6 DSR (M1) Data Set Ready
Input
7 GND (E2) Station Ground (reference
potential) –
8 DCD (M5) Data Carrier Detect
(carrier) Input
9 +TTY RxD TTY Receive Input
10-17 NC Not Connected –
18 +TTY TxD TTY Send Output
19 +20 mA Isolated power supply –
13
25
20 DTR (S1) Data Terminal Equipment
Ready
Output
21 -TTY TxD TTY Send
Output
22 RI (M3) Incoming call Input
23-25 NC Not Connected –
Gender changer for COM1
You can convert the COM1/V24/PLC port of the SIMATIC PC family into a 25-pin
male connector by means of the enclosed gender changer (25-pin
↔
25-pin). Plug
the gender changer onto the COM1 socket and secure it with the two Allen screws.
The V24 and TTY interfaces of COM1 can be used alternatively.