Specifications

Table Of Contents
Integrator’s Reference Manual for Polycom HDX Systems
2–56 Polycom, Inc.
Null Modem Adapter
This adapter is used when connecting a Polycom HDX system to a serial
device that transmits on pin 3 such as Crestron Pro2 processor. It is a male to
female DB-9 adapter plug. This connection may require the straight-through
serial cable (2457-09172-001) on page Straight-Through Serial Cable on
page 2-54 .
Do not use this adapter with an AMX device. AMX systems support both RS-232
and RS-422. Therefore, for RS-232 support, use a null modem cross-over cable
that carries only pins 2, 3, and 5, with pins 2 and 3 crossed.
Length Part Number RoHS Compliant
1517-61577-001 Yes
Drawings and part numbers are provided for reference only. Polycom claims no
responsibility or liability for the quality, performance, or reliability of cables based on
these reference drawings, other than cables provided by Polycom. Contact your
Polycom distributor or Polycom Custom/Vertical Products to order cables that meet
the appropriate manufacturing tolerances, quality, and performance parameters for
your application.
DB9F DB9M
PIN 1&6 PIN 4
PIN 2 PIN 3
PIN 3 PIN 2
PIN 4 PIN 1&6
PIN 5 PIN 5
PIN 7 PIN 8
PIN 8 PIN 7
PIN 9 N/C