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Why is the GSM module not "answering" when sending SMS commands?
#1
Question:
Why is the GSM module not "answering" when sending SMS commands?
Answer:
1.
SIM card must be mounted correctly and PIN code must be 1000.
2.
Battery for GSM moduel must mounted at charged from main battery in at least 5 hours.
3.
No mounted antenna or insufficient signal strength.
4.
The GSM module must be "woken up". The module can manually be "woken up" by pressing button 5 sec. or until LED lights up the first time. The module will then be "online" for 180 sec.
5.
SMS service no. must be programmed in parameter P3.
6.
Wrong commands. The commands is "case sentisive" and must be entered exactly as typed in manual.
7.
The number of the mobil phone used for configuration is not approved according to parameter: P4, P5, P6. (If parameters are not configured all phone no. are allowed).
8.
The no. of characters in SMS is above 180.
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