Siemens SIMATIC PG 720, Руководство пользователя

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8
8-11
PG 720 Programming Device
C79000-G7076-C720-02
The serial port (COM1) on the PG 720 has the following pinout:
1
13
14
25
Figure 8-7 COM1 Serial Port
Table 8-9 Pinout Table of the COM1 Serial Port
Pin No. Designation Description Input/Output
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) Data set ready Input
7 GND (E2) Ground (reference potential) –
8 DCD (M5) Data carrier detect Input
9 +TTY RxD TTY receive Input
10 –TTY RxD TTY receive Input
11 M20 RxD Isolated current source –
18 +TTY TxD TTY send Output
19 +20mA Isolated current source –
20 DTR (S1) Data terminal ready Output
21 –TTY TxD TTY send Output
22 RI (M3) Incoming call Input
1 – Shield –
11-17 – Not assigned –
23-25 – Not assigned –
Serial Port
(PLC/V24/Modem)
Hardware Information