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Update 2:
After increasing capacitance from 1000 uF to 2200 uF between +VBAT & GND, the problem solved. Now I can communicate with M590 by all applicable commands.
Update:
The module OFF/ON recycling problem solved after connecting 1000uF capacitor between module +bat & GND.
But network related commands are not working.
+CPAS command returns : 1 unavailable. The command is not allowed by the module terminal (MT).
I'd got NeoWay M590E module from online store, assembled and tested it successfully. ON/OFF pins is pulled down permanently so it starts automatically when power is applied. It gives correct response to AT command issued from hyper terminal when sim card is not inserted.
But it has problem of...
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