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    The main tool for troubleshooting the ABNs is the 'STATUS' LED on the front panel of the unit. This LED will flash either one to four times per second. This is an indication of the state of the unit and the following describes the meaning of the flashes:-

    One flash per second indicates that all is well. The unit is communicating with either the external cellphone or its internal GSM module. The unit is registered with the network and all functions should be active.

    Two flashes per second indicates that a voice call is currently active.

    Three flashes per second indicates that the unit is unable to register on the GSM network. This could be caused by a number of potential problems. Firstly and most commonly, the PIN request on the SIM card has not been disabled on the ABN-1/8+ units. Secondly it may be that the SIM card has not been properly inserted or is faulty. Check the functionality of the SIM card and (on the '+'-models) make sure it has been inserted correctly. Thirdly, there may be inadequate reception for the phone or GSM module to register on the GSM network. Check for adequate reception or antenna problems.

    Four flashes per second indicates that the unit is unable to establish comunication with either the external phone or internal GSM module. In the case of the external phone, check that the cable is properly connected and that the contacts are clean. It may be that the cable itself is faulty. The phone or internal GSM module itself may be faulty and require repair.

    When the ABN is in the process of sending an SMS message, the status LED will flash rapidly for a few seconds. If it is unable to successfully send the message, it will retry five times before giving up, and during that time the LED will flash for a noticeably longer period. If it is unable to send the message, it is probably due to the SIM having no airtime left! In any event, it will be necessary to check the SIM card functionality in order to establish the reason why the network will not permit the sending of messages.