Posts by Ben

    What is the RJ11 connector supplied with the Terminal TER-GX10x for?

    Its used for updating the firmware in the GSM/GPRS/PCS engine inside.

    How is the firmware update made?

    You request the latest firmware from Round Solutions or e-mail

    You start the software program on your pc.

    The terminal TER-GX10x is switched off.
    The RJ11 plug is inserted in the audio socket of the TER-GX10x.

    Start the Terminal TER-GX10x and remove the RJ11 plug after 5 seconds.

    Now the firmware update starts.

    If you have any questions or comments, please contact

    [quote]I beleive I have the honour and pleasure of posting the first thread in this board !

    Very Nice!

    1) Does the TER-GX101S containt a GSM Module GM862-GPRS module. So does all the documentation relevant to that Module apply to the TER-GX101S ?

    Yes, the TER-GX101S has the GM862 series inside.

    2) We want to integrate such a module into a 1U 19" rack PC case. Is the 4Pin Molex power supply connector on the module compatible with an Standard ATX12V 4 Pin 12V connector (MOLEX 39-01-2040 or equiv) ?
    More generally do you have any comments about using an ATX12V power supply also used for providing power to a PC Motherboard and HardDrive.?

    I will check on that and reply with an e-mail or post it here.

    3) Does the module casing provide proper RF shielding ?

    Yes, the GM862 modules are shielded and the alu housing of the TER-GX101S is enhancing it additionally.


    Can you specify on which country you are working and with which network operator, so that maybe someone has already done the GPRS connection and can tell yuo the right values for
    APN, username and password required for GPRS connections?

    - Edited by Ben 20.08.2003, 12:02 -
    - Edited by Ben 20.08.2003, 12:03 -


    the reason is that you give LF after the commands: remove LF command and just give CR.


    PS. I did know that myself!!

    I am using the GM862-GSM/GPRS with RS-EB-S1 board.
    Why does it go down into sleep mode after 20-30 Sek?

    The interface chip MAX3238E on the RS-EB-S1 board has an Auto-Power-Down Mode.
    This chip has an automatic power-down mode (after 20-30 Sek) to reduce the power consumption.
    You can switch this mode off when you lift up the Pin number 13 of the MAX3238E, so that he has no more contact to Ground and
    then connect it to pin 14 of the MAX3238, that means to VCC.
    After this patch the chip never will switch to the auto-power-down mode.

    If you wish to obtain the data sheet of the MAX3238E, please contact Rround Solutions.
    We are happy to help you!

    How can I automatically turn on at power-up of the GM862-GSM/GPRS?

    The GM862-GPRS GM862-GSM needs a negative pulse of at least 1s on the ON* pin of its connector to turn-on.
    This is obtained with an open collector transistor.
    For the control of the real turn-on of the module or to control possible shutdown due to power drops during the functioning of the module, you can check the PWRCTL (also named START) line. The PWRCTL line remains high (2.7V for GM862-GPRS and GM862-GSM) for all the time the module is ON.
    It is therefore possible to design a small circuitry to turn-on the module automatically when it`s powered, it is even possible to add some circuitry in order to turn on again the module if it has been shutdown (for example by an external RESET) without the need for resetting the power supply.

    If you want the module just to turn-on when powered (but turn-off if AT#shdn command issued) please ask Round Solutions.
    Some adjustments may be needed in the values of: R2, C3 and R3,R4,C2 depending from the VBATT to adjust pulse timings.

    Examples of circuits may be obtained by Round Solutions.
    Please e-mail Round Solutions and ask for the "Power-Up-Circuit".

    Can the customer design the application is such a way that they
    can change from the internal sim card to the external and back to
    the internal without turning off the GM862 modem?

    The GM862 don`t permit that internal SIM and external SIM are simultaneously

    A solution could be this one:
    You must use two external SIM card Holder and add two three states buffers
    to separate the not active SIM from the bus of active SIM.

    On the GM862 there is a CCIO line for managing the inserting and removing of
    the external SIM card Holder.
    The CCIO pin must be managed from an external logic control in such a way

    1- at the ignition of GM862 the SIM must be inserted and the CCIO pin must
    be low.
    2- when you need to change SIM you must switch the CCIO pin high
    3- to set in tristate the buffer of SIM that you want disable.
    4- to activate the buffer of the SIM you want to use
    5- you must put the CCIO pin low again.
    6- now the GM862 starts with the SIM inizialization again

    Note: There is no limit about number of SIMs, obviously you have to use the
    same number of SIM and three state buffers.

    Q1: Is only "IRA" for TE character set ?
    I want to use "ucs2" for unicode.

    Actually in SMS TEST mode the only character set supported is IRA;
    in SMS PDU mode all character sets are supported since they are enclosed in the PDU.
    Therefore if you want to use "ucs2" for unicode as character set, then work in PDU mode.

    Q2: I also want to use 8bits and PDU mode to send SMS ,
    but when I set "AT+CSMP =x,x,x,y" ,y=25 ,04,244~248. The GPRS
    module responses error code :303.
    How can I deal with it?

    The "AT+CSMP=x,x,x,y" command applies only to the SMS TEXT mode, it does not apply to
    the PDU MODE. In PDU mode all the SMS parameters are enclosed in the PDU.
    Therefore you don`t have to send the AT+CSMP command if you work in PDU mode.
    - Editiert von Ben am 05.05.2003, 16:20 -

    Concerning the RTC on the GM862-GPRS; it is about 18 hours a day the main
    power is not available. Can we use a cheap circuitry?

    they can use a backup capacitor of 0,47F. It works up to -25 degrees.

    You can find on the web sites:…/pdf/ee237_eec_sg_dne.pdf

    The regulator have to be isolated from module+backup capacitor during

    It can be done with a mosfet that they have to disable with the module
    For the mosfet you can visit the web site:

    The mosfet have to lead when the regulator is switched-on and have to be
    interdict when the regulator is switched-off.

    Our application is PDU and `8bits` , to send SMS.(maybe also use ucs2)
    And in GM862-GPRS, no 8bits only 7bits[IRA].(at+csmp=?)
    Now how can we do?

    You can send PDU at 8 bits or uc2 when you use SMS in PDU mode.
    The IRA set (and so the limitation to 7 bit) is only for SMS in text mode.

    In order to send SMS in PDU you don`t have to set the +CSMP because all data is included in the PDU.
    Just set the PDU mode AT+CMGF=0 and send directly the PDU with the AT+CMGS=<pdu_length>

    > CTRL-Z (CTRL-Z is hex char 0x1A or \\1AH )

    - Editiert von Ben am 03.05.2003, 14:52 -