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MC20 reference code
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MC20 positioning module reference code, debugging instructions: 1 abnormal communication solution. Check whether the power supply meets 5v-18v, whether the positive and negative poles are connected correctly, whether the serial port connection mode is normal, txd-rxd-txd gnd-gnd. 2 solution for not reading SIM card. After power on, wait 2-3 seconds to read again. Check whether the SIM card is China Mobile or China Unicom. Check whether the SIM card is inserted correctly. When there is a SIM card on our board, check whether the notch direction of the SIM card is inserted when the module is powered off. There is no registered network solution. It takes time to register the network. Generally, it can be registered in 15 seconds. Check whether the signal quality is good enough, generally greater than 10. Check whether the GSM antenna is installed and whether the power supply is sufficient. When using GPS positioning, there is no need to install SIM card and GSM antenna.
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