Specifications

The Serial Port A-1
Appendix A
The Serial Port
Most computers provide a DB-25 or DB-9 port that conforms to
the EIA-232 standard. If you are connecting the Courier to a
Macintosh computer, see the section For Macintosh Computers.
The EIA-232 Interface
The Courier’s serial port is factory set to signal according to the
EIA-232 standard:
DB-25 Connector
(Female)
Figure A-1. Signals at the Courier's Serial Port.