Troubleshooting guide

PAGE 32 of 36 VR GSM DOOR INTERCOM TECHNICAL MANUAL VER2.0.0
TROUBLE SHOOTING
SYMPTOM TEST
Interference on the speech
Check the signal strength ‘1111SIG?’. If the signal strength
is to low the GSM module which increase it’s power to
compensate causing interference with the speech circuits.
Try relocating the antenna or using a more powerful or
directional antenna.
Ensure the antenna cables are not running close to the
power supply cables or the microphone wires inside the
intercom panel
Try a different SIM card from a different service provider as
they may have better coverage in that area.
The intercom panel repeatedly beeps twice
and the name plate back light of the module
(Not additional button modules) does not
Check the power supply is of adequate voltage as show
earlier in this manual and that the jumper JP1 is in the
correct position.
illuminate.
Try a full reset as shown earlier in the manual (Powering
up with C2 & PTE shorted).
Try a different SIM card.
Intercom module may have a fault.
A long beep is heard when I press a button.
No telephone number setup for that button. Check the
programming.
Check the SIM card is fitted correctly.
The intercom panel does not respond to
SMS messages
Check the SIM card has a SMS service centre number
stored. This will require putting the SIM card into a mobile
phone to check. Contact the SIM card provider if you are
not sure.
Check the number you are sending the message to is
correct (The number of the SIM card in the intercom panel
After sending a SM to the intercom panel. Listen for a
single short beep from the Intercom panel. This will
indicate that the message was received and understood. If
a long beep is heard it indicates the message was either
not understood or the 4 digit code was incorrect.
Try resetting the 4 digit code to 1111 as shown earlier in
this manual (Powering up with C1 & PTE shorted).
The call keeps dropping out
Increase the call time in programming.
Check the signal strength and if necessary, move or
change the antenna or try a different SIM card provider.
Speech echoes and feeds back
Try lowering the speaker volume using jumpers JP2 & JP3
Try adjusting the volume using the programmable settings
during a call
Check the microphone is fitted correctly in the intercom
panel and that the mic hole is not blocked in any way.
ERROR message returned in SMS when
programming or no SMS returned at all
even though a ? was included at the end of
the message sent.
Check over the message sent again and compare it with
the examples in the manual.
Common errors include:-
1. Using two apostrophe marks side by side instead of “.
Note that these look the same in the message. An easy
way to see if this is the problem is to move the cursor
along in the message and if the cursor can get between
the two “ then it is not the connect character used.
2. Lower case letters instead of upper case. For example
using stn when STN should be used.