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13. PREPAID AIRTIME VOUCHER LOADING
If using a prepaid SIM card, it is recommended that prepaid airtime be topped up via an ATM or via
your bank's Internet banking portal. If your network or bank does not support this, you can purchase
a normal airtime voucher and remotely send the voucher number to the GSM Commander, which will
in turn send the voucher number to the network to top up the airtime.
Your airtime top-up voucher is typically a long number, and when using this voucher number with a
normal cellphone, you typically need to frame this number by some preceding and appending text.
For example, with MTN in South Africa, you need to send:
“*141*0000000000000#”
where the “141” is network-dependent, and the 0000000000000 is the voucher number.
This detail is typically provided on the voucher slip.
To send a voucher to the GSM Commander, you simply send it an SMS of the form :
SENDUSD:*141*000000000000#
( from any number)
where 000000000000 is the voucher number.
The GSM Commander will receive this and post the voucher number along to the network.
14. SERIAL PORT
The GSM Commander is configured via USB from a PC. The GSM Commander also provides a serial
functionality, that can be used for various functions, described later in this manual. Both the USB
and Serial ports are internally connected to the GSM Commander microprocessor.
Signalling levels:
RS232
Connector:
RS232 / Audio
(10pin IDC Header)
Please Note:
Configuration via the software is ONLY possible through the USB port and
configuration messages sent via the Serial port will ONLY get a response via the Serial port.
The pin-out is as follows:
Pin 1
: MIC+ (Can connect to condenser MIC for voice calls)
Pin 2
: MIC
–
(Can connect to condenser MIC for voice calls)
Pin 3
: SPR
–
(can be connected to an external audio system)
Pin 4
: SPR+ (can be connected to an external audio system)
Pin 5
: RS232 RX to GSM Commander(Input)
Pin 6
: RS232 TX from GSM Commander(Output)
Pin 7
: Not used (Do NOT Connect)
Pin 8
: +5V
Pin 9
: GND
Pin 10
: +14V from input supply
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