FALCOM TANGO55i, Hardware Description

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TANGO55/
I
& TANGO56/
I
V
ERSION
1.03
Both interface B and C are not independent usable. The interface B has the highest
priority. If you don’t want to use the interface B you must deactivate the signals RTS
(or remove connection). With the interface C you have the audio and control
functionality on one interface.
See table for connections:
Pin Description Direction
1 Power output 10V ± 5% 150mA OUT
2 Received Data (RxD) IN
3 Transmitted Data (TxD) OUT
4 Ground
5 SPK+ OUT
6 SPK- OUT
7 MIC+ IN
8 MIC- IN
Table 13: Pin description fo RJ45
4.2.3 Reset configuration
In case of malfunction the GSM/GPRS modem offers various RESET possibilities.
For a RESET of the GSM/GPRS modem please use the following way:
a) Operating voltage remains applied, the Ignition line of the modem
remains connected to the operating voltage or any other external
power source (10,8V ... 31,2V).
b) Then, send for at least 100ms a LOW signal level to the Transmit Data
[TxD] pin of the serial interface B or C (means: send a “BREAK” signal to
the used Transmit Data [TxD] line from a terminal software). The “BREAK”
signal forces the modem to perform a reset by driving the TxD pin of
modem to the ground.
c) Once the system detects an incomming signal through TxD pin (e.g. type
AT <enter> on the terminal screen) the modem set itself into the
command mode. (Via IGN line is also posible, by disconnecting the
Ignition line (IGN) and connecting it again, the modem set itself also into
the command mode).
If the GSM software is still running, while the user feels the need to reset the modem,
AT+CFUN=1,1 could be used. This will de-register the modem from the network and
bring it into the state before the PIN has been entered.
4.2.4 Firmware update
The download procedure is documented in chapter 8.
4.2.5 Turn off GSM/GPRS engine of the TANGO55/56 modems using AT
command
The best and safest approach to powering down the GSM/GPRS engine is to issue
the
AT^SMSO
command. This procedure lets GSM engine log off from the network
and allows the software to enter into a secure state and safe data before
disconnecting the power supply. The mode is referred to as POWER DOWN mode. In
this mode, only the RTC stays active.
Before switching off the device sends the following response:
^SMSO: MS OFF
OK
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