Com Port Pin Specifications; Rs-232 Com Port Pin Specifications - 3Com Impact IQ 3C882 User Manual

RS-232 COM Port Pin Specifications
The asynchronous RS-232-D COM port on the 3C882 ISDN
modem, labeled RS-232, is a standard DB-25 female
connector. The 3C882 ISDN modem asynchronous port pin
assignments, shown in Table C-1, conform to standard
definitions for data communications equipment (DCE).
Table C-1 Pin Descriptions
Pin # Pin Name
1 Shield Ground (GND)
2 Send Data (SD)
3 Receive Data (RD)
4 Request to Send (RTS)
5 Clear to Send (CTS)
6 Data Set Ready (DSR)
7 Signal Ground (GND)
8 Carrier Detect (DCD)
18 Local Loopback
20 Data Terminal Ready
(DTR)
21 Remote Loopback
22 Ring Indicator (RI)
RS-232 COM Port Pin Specifications
Signal Direction
—
To ISDN modem
From ISDN modem
To ISDN modem
From ISDN modem
From ISDN modem
—
From ISDN modem
From ISDN modem
To ISDN modem
To ISDN modem
From ISDN modem
C-2