GAI-Tronics CB193-001 Call Boxes - Manual (Page 19)

Pub.: 43004-031E
Model CB193-xxx, CB194-xxx, and CB195-xxx RF Call Boxes Page 18 of 52
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Battery Voltage Monitoring and Reporting
The micro-controller monitors the voltage on the battery by use of an analog-to-digital converter. The
battery voltage is sampled every 6 hours. If low battery voltage is detected, the Call Box transmits its
ANI and a low battery code (‘*LB’ = ‘*52’) via the radio. Once this report is made, the Call Box status
lamp turns amber and blinks for 0.25 second every 8 seconds until the battery is charged or replaced. As
noted in the ANI reporting paragraph, a DTMF decoding device will be required at the receiving end of
the Call Box transmission.
In call box-to-telephone line operation, a low battery ANI code is not transmitted. However, the Call
Box status lamp turns amber and blinks for 0.25 second every 8 seconds until the battery is charged or
replaced. In conjunction with the status lamp indication, the RF Call Box transmits a low battery alert
tone that is audible to the telephone user (if programmed for this operation). This tone is broadcast in
unison with the flashing status lamp. A telephone operator must be “online” with the RF Call Box to
hear this alert tone.
Off-Hook Reporting (Model CB194-xxx Only)
The Model CB194-xxx RF Call Box is fitted with a magnetic proximity hookswitch for handset sensing.
Activation of this sensor wakes the Call Box and initiates transmission of the programmed ANI code. If
the handset remains off-hook for an extended period following the termination of a call, or if no call is
initiated after the handset is taken off-hook, the Call Box again transmits its ANI and an off-hook alert
code (‘*OH’ = ‘*64’). As noted in the ANI reporting paragraph, a DTMF decoding device will be
required at the receiving end of the Call Box transmission.
N OTE : Off-hook ANI reporting is not available in call box-to-telephone line operation.