Задавали вопрос - а правда ли что на перых образцах былы перепутаны ножки nRESET и ON_OFF?
Ситуация следующая - физически ножки не перепутаны, а вот логика работы:
It is ture, for old SIM18 version, ON_OFF pin is used to let module enter full on mode, and nRESET pin is used to let module sleep .
But for new SIM18 module, the ON_OFF pin can be used to let module both into full on and sleep mode by interrupt.
The ON_OFF interrupt is generated by rising edge of a low-high-low pulse, which should be longer than 90us and less than 1s (suggestion is about. 100ms pulse length).
Do not generate ON_OFF interrupts less than 1 sec intervals. Especially take care that any multiple switch bounce pulses are filtered out.
See red mark number from below picture of lable on top of module.
01 is old one,
from 02 and more it is new version
Мы привезли образцы модулей начинающиеся вообще с 10, так что про старые можно не думать.