Symbol Technologies Spectrum24 AP-4131 - Manual (Page 27)

Introduction
AP-4131 Access Point Product Reference Guide 17
The DB-9, 9-pin, RS-232 serial port provides a UI (User Interface)
connection. The UI provides basic management tools for the AP. The serial
link supports short haul (direct serial) or long haul (telephone-line)
connections. The AP is a DTE (Data Terminal Equipment) device with male
pin connectors for the RS-232 port. Connecting the AP to a PC requires a
null modem cable.