TANGO
VERSION 1.04
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Page 23
2.2.1
Ignition line
The Ignition Line on Interface A uses an internal processor to control the
timing of the “SOFT-ON“ procedure of the internal GSM modem.
To switch the modem ON the Ignition Line has to be connected to a high
voltage level of (10,8V ... 31,2V). The green LED on interface C shows the
progress of the “SOFT-ON“ procedure (green indicator light). Enter PIN
Number of the inserted SIM card (if required). After a few seconds it will go
flashing slowly (that’s mean the registration into the network is
successfully).
To switch the modem off the commands AT+CPOF or AT+CFUN=0 (see
AT commands manual) has to be issued. To switch the modem on again see
above.
2.2.2
Serial handling
The GSM/GPRS modem TANGO allows control of the GSM/GPRS modem
over the interface B or Interface C. The interface B is a implementation of a
serial interface corresponding EIA-RS232-C.
See table below for details:
CCITT V24 Pin
Description
Direction
102
5
Signal Ground (GND)
103
3
Transmitted Data (TxD).
The DTE uses the TxD line to send data to the
interface for transmission over the Modem.
IN
104
2
Received Data (RxD).
The interface uses the RxD to send data
received from the Modem to the DTE.
OUT
105
7
Request To Send (RTS)
IN
106
8
Clear To Send (CTS)
OUT
107
6
Data Set Ready (DSR)
OUT
108
4
Data Terminal Ready (DTR)
IN
109
1
Data Carrier Detect (DCD)
OUT
125
9
Ring Indicator (RI)
OUT
Table 12:
R232 9-pin description
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.
