Specifications

208
APPENDIX F • TROUBLESHOOTING
7 Beaver Brook Road, Littleton, MA 01460 • 978-486-0086 • www.burk.com
If this happens...
I can’t connect to the site using the
VRC2500 software.
My dial-up modem connection is
unreliable at the 19,200 baud rate.
The power LED on the Command Relay
Unit(s) does not light, or only one lights.
The Alarm Handler does not report
alarms. It says that the unit is not
recognized.
Try this...
Check the connection between the on-site
modem and the VRC unit. Check the
auto-answer status lights on the modem
and make sure it is on.
The modem must be turned on, plugged
into the correct COM port, and the VRC
unit must be power cycled before the
modem will be detected by any outbound
calls for alarms will be made.
Direct connect the PC to the VRC unit to
make sure they can communicate. Run
the VRC Site Manager and make sure the
ports are configured correctly.
If you hear two sets of tones (both
modems are attempting to connect),
make sure that both modems are set to
the same baud rate – 19,200 is
recommended. Both modems should be
set for the same speed. If they are not,
the faster modem may not be auto-
bauding down fast enough.
Install an RFI filter next to the modem.
Install an RFI filter in line with the modem
or Voice Interface – whichever is
connected to the TELCO line.
Check and tighten the DB37 cable
connection.
The VRC unit's 5VDC outputs are
protected by chemical (self-healing) fuses
which will reset in about 30 seconds once
an overload has been removed. Unplug
the DB37 connector and wait at least 30
seconds. Then, plug the connector back
in. The power LEDs should light. If the
problem persists, please call technical
support.
Make sure that the site password in the
Site Access window is the same as the
password in the Site Properties window.
Typically a change in one window
automatically updates the other.
It could be that...
The modem is not answering.
The VRC2500 unit is not powered or has
not been power-cycled since installing the
modem.
The COM ports aren’t configured
properly.
The modem isn’t configured properly.
Radio Frequency Interference is inhibiting
communications.
Close proximity to a transmitter or other
RF sources may cause interference with
the modem signal.
The unit is not properly connected.
A fuse may have blown.
The site password set in the Site Access
window is not the same as the site
password set under Site Properties.