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MT-703 User Manual
7
Troubleshooting
7.1
LED signalling
The tree LEDs placed on the circuit board of the MT-703 module are a very useful
diagnostic tool. As it was mentioned previously, each LED has a specific function
and its name. Starting from the left, there are following diodes:
· The GSM LED
· The Status LED
· The USB LED
The purpose of the GSM LED is informing the user about the GSM modem status.
Under a normal operation of the module, this LED indicates the change of a
stand-by mode into an active mode, using short single blinks. The single and a little
bit longer blink indicates a next step, when the GSM module is working and ready
to activate the communication port. This means that the module is ready to
communicate with configuration software, which is indicated by double blinks. Then
triple blinks indicate that the module has successfully logged in the GSM network. If
GPRS transmission is not configured, this moment indicates the end of the module
activation. When the GPRS transmission is enabled, the fourth, more longer blink
appears, and it means successful login to the selected APN.
The consecutive steps in transition from the stand-by mode to the active mode
(when the GSM/GPRS transmission is possible) are as follows:
1. No communication with the GSM modem
2. The GSM modem is running
3. The USB port of the MT-703 module is ready for communication
4. The GSM modem is registered in the GSM network
5. The GSM modem is logged in the selected APN of GPRS network
The blink repetition period and blinks duration are shown on the figure below.
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