perating and Installation
cannot make a connection in CSD mode. This could be caused if
ervice provider does not support CSD connections or if the modem that
is being called is not connecting.
The GSM SIM card is defective or cannot be read. Try another SIM card. A
SIM card is a memory device and can be damaged by static discharge. If
another SIM card also fails then this indicates an electrical problem with the
The radio does not respond properly to an echo
The radio cannot be initialized. This can be caus
battery. Otherwise the radio or GSM SIM card may be defective.
The radio did not return a proper response to a command. This is a problem
with the radio or perhaps the GSM SIM card.
Packet (Internet) service is not avail
able. This is a problem with the network
or with the way the cellular account has been set up.
The radio does not respond properly to an SMS command. This is a
activation (OTAA) call failed (CDMA units onl
Logic supply Vcc is less than 2.8V during light
generally caused by a nearly depleted battery.
Logic supply Vcc is less than 2.8V during heavy
powered up). This is generally caused b
y a nearly depleted battery or a
power source that cannot supply the current required by the radio.
The output of the radio’s regulator circuit is less than 3.4V.
There is a data retention problem with the non
board has not been calibrated.
Problem reading voltages and temperature (A/D converter problem)
There is no primary phone number to dial or no primary IP address to
connect to. Check the configuration.
mmunications problem with the non
LED Error Codes 21 thru 39
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