TANGO55/
I
& TANGO56/
I
V
ERSION
1.03
The actual state of modems is displayed by two LED’s at the connector on the top of
interface C of the unit.
Off
Modem is off or run in SLEEP mode
600 ms On / 600 ms Off
No SIM card inserted or no PIN entered, or network search
in progress, or ongoing user authentication, or network login
in progress.
75 ms On / 3 s Off
Logged to network (monitoring control channels and user
interactions).
No call in progress.
75 ms On / 75 ms Off/
75 ms On / 3 ms Off
One or more GPRS contexts activated.
Flashing
Flashing Indicates GPRS data transfer: When a GPRS
transfer is in progress, the LED goes on within 1 second
after data packets were exchanged.
Flash duration is approximately 0.5 s.
Green LED (GSM)
On
On Depending on type of call:
Voice call:
Connected to remote party.
Data call:
Connected to remote party or exchange of
parameters while setting up or disconnecting a call.
Off
Power off or interface C in use.
Yellow LED
On
Power on, interface B in use or both interfaces (B & C) are
not connected.
4.2.1 Ignition
line
The Ignition Line on Interface A uses an internal processor to control the timing of the
“TURN-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
“TURN-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 means 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.
4.2.2 Serial
handling
The GSM/GPRS modem TANGO55/56 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 to 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
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