Specifications

Burk Technology is able to offer only limited support for other modems used with GSC3000 or VRC2500. If
you are using an unsupported modem, please refer to the US Robotics DIP switch settings for help configuring
the appropriate functions for the modem you are using.
Connection
Note: Be sure your modem is correctly installed in Windows and that it is properly functioning before using it with
the GSC3000 or VRC2500 system.
Follow the steps below to connect the US Robotics modem to the system. Refer to
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if you are connecting your modem to a Voice Interface in a GSC3000 setup.
1. When connecting to a GSC3000 I/O unit, connect the modem to the I/O unit’s COM2 port with the
supplied DB9 to DB25 serial cable (as shown below). For a VRC2500 unit, connect the null modem cable
to the DIAL-UP port (as shown below).
2. Use a standard telephone cord to connect the TELCO jack on the modem to the RJ-11 wall jack.
3. In order for the GSC3000 or VRC2500 to detect the newly installed modem, cycle the power on the unit.
Note: Always use a telephone line surge suppressor when connecting a modem or Voice Interface to the RJ-11 wall
jack. Damage caused by voltage surges, including lightning strikes, is not covered by the factory warranty. Visit our
web site at www.burk.com
or contact our sales department for information on suppressors we recommend.
GSC3000 & VRC2500 INSTALLATION & OPERATION MANUAL
CHAPTER 6: MODEM & SITE EQUIPMENT CONNECTIONS
50
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1 UP Data Terminal Ready
2 UP Verbal Result Codes
3 DOWN Enables Result Code Display
4 DOWN No echo, offline commands
5 UP (I/O unit)
DOWN (Voice Interface)
Enables auto answer. The modem will answer the incoming call for the I/O unit.
Disables auto answer. The voice interface will automatically answer the call.
6 UP Carrier detect normal
7 UP Load NVRAM defaults
8 DOWN Smart mode