T:>> GSM modem disconnects after a while II

  • Q: Type of module? A: TER-GX400
    Q: Firmware version? A: 08.01.005
    Q: Type of starter kit you have?
    (S1, S1B, S2, S3, S4, EVK1, EVK2, none, other)

    It seems that the modem , after a couple of hours of not being used , it enters "probably" in a power saving mode closing the connection port.
    Tested on two different PC's one with Windows XP and the other one Windows Vista.

    I implemented an application that sends every hour an AT command. The application is running for 48 hours and still working vs (3-6 hours before).

    For AT+CFUN? the response I get is +CFUN=1 (power saving is disabled). But it behaves as it is going in power saving mode.

    Found a tech doc "Modules_Software_User_Guide_r1.pdf" that specifies the fallowing:

    I was also thinking that it might be from Windows default settings when entering power saving mode (It might shut down the COM ports to save energy).

    Do you have any ideas how to solve this?