Specifications

A-2 Courier V.Everything External Modem: Getting Started
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.
DB-25 Connector
(Male)
DB-9 Connector
(Female)
Minimum Requirements
Some computer/terminal equipment supports only a few of the
Courier’s EIA-232 signals. The minimum required for the
Courier to operate asynchronously follows:
DB-25 DB-9
Pin Pin Function
2 3 Transmitted Data
3 2 Received Data
7 5 Signal Ground
20 4 Data Terminal Ready
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.