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Reference Guide Crestron 2-Series Control System
82 • 2-Series Control Systems Reference Guide – DOC. 6256A
Appendix A: Interfacing a Control System with a Modem
NOTE: The 2-Series control system must have CUZ version 3.129 or later installed
to ensure proper modem communications. For a general guide to operations, refer to
the “Quick Guide” setup described below. For further details on cabling and other
modem operations, refer to the sections after the “Quick Guide”. The instructions in
this appendix use a modem that can be configured with DIP switches.
NOTE: This procedure requires Crestron Viewport.
Quick Guide
The following are required to interface a PC with a control system via modem:
• Rack Modem: A Hayes compatible (AT command set) modem with DIP
switches that can be set to the required settings. This is the modem that is to
be connected to the control system.
• PC Modem: A Hayes compatible (AT command set) modem that can be
addressed on a COM port, for use with the Viewport utility on the PC.
• Proper equipment to connect the PC modem to the PC (refer to modem
manufacturer's instructions for this).
• Control system-to-modem cable:
⇒ If the control system is a PRO2, AV2, RACK2, PAC2, CP2,
CP2E, MC2, MC2E, or MC2W, use a DB25M-to-DB9M straight
through cable or a DB25F-to-DB25M (or DB9F- to-DB9M) cable
with a null modem adapter
⇒ If the control system is a QM-RMC or a QM-RMCRX(-BA) use a
DB25M-to-DB9M straight-through cable with a DB9F-to-DB9F
gender changer.
• 2-Series control system
Perform the following procedure:
1. Make sure all equipment is powered off.
2. Set the rack modem DIP switches as shown in the following table. Note
that the following table describes the DIP switches of a U.S. Robotics
33.6K Sportster FAX modem. Most Hayes compatible modems should
have similar switching options.
Rack Modem Switch Settings
SWITCH
NUMBER
REQUIRED
SETTING
POSITION DEFINITION
Up DTR normal 1 Down
Down DTR override (always high)
Up Verbal result codes 2 Either
Down Numeric result codes
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