Table of Contents
Advertisement
Wiring a DB-25 to DB-9 Cable
DB-9 connectors for PCs should be wired at the computer end of the
cable as shown below.
Minimum Requirements
Some computer/terminal equipment supports only a few of your I-
modem's EIA-232 signals. The minimum required for your I-modem
to operate asynchronously follows:
DB-25
Pin
2
3
7
20
Flow Control Requirements
If your computer and software support Clear to Send and you wish
to use Transmit Data hardware flow control (&H1), Pin 5 (DB-25) or
Pin 8 (DB-9) is required.
If your computer and software support Request to Send and you
wish to use Received Data hardware flow control (&R2), Pin 4
(DB-25) or Pin 7 (DB-9) is required.
Technical Information
Figure B.2 Wiring a DB-25 Cable
DB-9
Supports this signal
Pin
Function
3
Transmitted Data
2
Received Data
5
Signal Ground
4
Data Terminal Ready
B-7
Advertisement
Table of Contents
