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“On Air” Indication
Whenever the LINKS unit is communicating over the cellular network, the red LED (L1) on the unit’s circuit
board will be illuminated. When communications are successfully completed and there are no troubles to
report, the LED will return to its stand-by indication of one flash every 10 seconds. If trouble conditions exist,
the LED will flash 2 or more times every 10 seconds.
20-minute Transmission Cut-off
The LINKS1000 will automatically “hang up” after 20 minutes of continuous communication. This feature is
designed to prevent a cellular call from lasting indefinitely.
NOTE: The 20-minute cut-off time may affect
downloading performed through the LINKS1000. While performing downloading functions, the LINKS1000
will automatically hang up the call after 20 minutes.
LINKS1000 TROUBLE SHOOTING
If LINKS1000 will not communicate to the central monitoring station receiver, check the following before
calling Sur-Gard technical support:
1. Check all wiring
A. Make sure T1 & R1 of the LINKS are connected to Tip & Ring of the control panel.
B. Make sure the GND of the LINKS is connected to a zone common or Aux- of the control panel.
C. Make sure the proper resistor is in place on control panel PGM (see installation instuctions).
D. Make sure the programmer is not plugged into the LINKS1000.
2. Check the trouble LED (L1)
A. Check number of flashes on trouble LED. If the LED flashes more than once every ten seconds, refer
to Table 2. Repair the indicated problem.
B. Four flashes means bad communications with the cellular network. Add an extension antenna.
C. Eight flashes means bad PGMIn connection. This means the GND for the LINKS is not connected to
a panel ground or the control panel is not programmed correctly.
Be sure the control panel is properly programmed for LINKS operation. PGM outputs on DSC
equipment will be set to logic low when the panel is programmed correctly. Check the installation
instructions in the LINKS1000 manual for the particular panel being connected.
3. If red LED flashes once every ten seconds, yet LINKS still cannot reach central station:
A. Connect a telephone handset to TIP & RING of the control panel. Send a signal through the LINKS.
Listen to the handset. If a ‘network’ message is heard, make note of it and follow the instructions. For
instance; the network message says “you must first dial a 1 or zero before placing this call”. The
telephone number in the control panel probably requires a ‘Preamble’. Be sure the central station
telephone number is not programmed as the LINKS1000 cellular telephone number.
B. Check cellular activation. Call the cellular number of the LINKS1000. If the LINKS is properly activated
yet turned off, the network message should say “the cellular customer you have called is unavailable
or has traveled outside of the coverage area”. If the LINKS cellular number is called and the LINKS is
turned on (and downloading is not enabled and connected), the message should say “the customer
you have called has left the vehicle”, or it will simply hang up (this would occur after many rings). If the
cellular number is not activated the message will say “the number you have called is not in service”.
Call the cellular service provider and check the activation. Be prepared with the LINKS ESN and the
telephone number.
