Crestron
CNXTA
CNX Telephone Audio Interface Card
CNX Telephone Audio Interface
Card: CNXTA
Description
Functional Description
The CNX Telephone Audio Interface Card, CNXTA, allows access and control of a
Cresnet system through standard telephone lines. The CNXTA recognizes and
generates telephone Dual-Tone Multifrequency (DTMF) signals. When the CNXTA
is installed, these signals are used by a Cresnet system to remotely operate any
device controlled by the system. The CNXTA also recognizes caller ID (CID) and
CID on call waiting.
The CNXTA uses audio messages as voice prompts and responses. These files can
be recorded as WAV files on a personal computer (PC) using Microsoft®
Windows™ Sound Recorder, converted to PCM format, and transferred to the
CNXTA. Pre-recorded WAV message files can be downloaded from Crestron’s
website (
A Cresnet system with the CNXTA may be programmed to respond to incoming
telephone tones or sequence of tones. For example, pressing 1 or 12 from a telephone
(after connecting to the system) may be used to activate an air conditioning system
and the CNXTA would respond with “Command accepted, air conditioning is on”.
The system may also be programmed to dial-out and play a recorded message when
a specific input, such as from a security device, is received. By using CID
information, the system can be programmed to allow access only from a specific
telephone or even limited access from other lines.
Physical Description
The CNXTA, shown on the next page, is a circuit board fastened to an aluminum
faceplate. The card is installed into an unoccupied slot in a Crestron CNX
Generation Control System. The faceplate contains two audio ports and one
telephone port that are described on the next page.
Operations & Installation Guide - DOC. 8144A
CNX Telephone Audio Interface Card: CNXTA
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Summary of Contents for CNXTA
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