Com Impact Digital Modem; Cabling Requirements; Pin Descriptions - 3Com DIGITAL MODEM User Manual

Cabling Requirements

Cables to connect the 3Com Impact digital modem to your
computer are provided. For IBM or IBM-compatible PCs with
a 25-pin serial port, a DB-9–to–DB-25 connection adapter is
included with the digital modem.
The asynchronous RS-232-C port on the digital modem,
labeled Computer, is a standard DB-9 female connector. The
digital modem asynchronous port pin assignments, shown in
Table 1-2, conform to standard definitions for data
communications equipment (DCE).
Table 1-2 Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
Pin Name
Carrier Detect (DCD)
Receive Data (RD)
Transmit Data (TD)
Data Terminal Ready
(DTR)
Signal Ground (GND)
Data Set Ready (DSR)
Request to Send (RTS)
Clear to Send (CTS)
Ring Indicator (RI)
Cabling Requirements
Signal Direction
From digital modem
From digital modem
To digital modem
To digital modem
—
From digital modem
To digital modem
From digital modem
From digital modem
1-9