User Manual

TANGO55/I & TANGO56/I VERSION 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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