FALCOM TANGO Guide

This document is available at HTTP://WWW.FALCOM.DE/ .
TANGO
Hardware description
Version 1.04

TANGO VERSION 1.04
This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.
Page 1
Contents
0 INTRODUCTION ..............................................................4
0.1 SCOPE OF THE USER’S GUIDE .......................................................................................................... 5
0.2 USED ABBREVIATIONS.................................................................................................................... 6
0.3 RELATED DOCUMENTS.................................................................................................................... 6
1 SECURITY .........................................................................7
1.1.1 GENERAL..................................................................................................................................... 7
1.1.2 EXPOSURE TO RF ENERGY ..................................................................................................... 7
1.1.3 EFFICIENT MODEM OPERATION............................................................................................ 7
1.1.4 ANTENNA CARE AND REPLACEMENT................................................................................. 8
1.1.5 DRIVING ...................................................................................................................................... 8
1.1.6 ELECTRONIC DEVICES............................................................................................................. 8
1.1.7 VEHICLE ELECTRONIC EQUIPMENT .................................................................................... 8
1.1.8 MEDICAL ELECTRONIC EQUIPMENT ................................................................................... 8
1.1.9 AIRCRAFT ................................................................................................................................... 8
1.1.10 CHILDREN ................................................................................................................................... 9
1.1.11 BLASTING AREAS ..................................................................................................................... 9
1.1.12 POTENTIALLY EXPLOSIVE ATMOSPHERES........................................................................ 9
1.1.13 NON-IONISING RADIATION ....................................................................................................9
1.2 SAFETY STANDARDS..................................................................................................................... 10
2 GENERAL CHARACTERISTICS.................................11
2.1.1 General ........................................................................................................................................ 11
2.1.2 Electrical...................................................................................................................................... 11
2.1.3 Physical........................................................................................................................................ 11
2.1.4 Basic Features.............................................................................................................................. 11
2.1.4.1 Telephony..................................................................................................................................................... 11
2.1.4.2 Short Message Service (GSM and GPRS mode)........................................................................................... 12
2.1.4.3 GSM circuit Data Features .......................................................................................................................... 12
2.1.4.4 GPRS Packet Data Features ........................................................................................................................ 12
2.1.4.5 GSM Supplementary services....................................................................................................................... 12
2.1.4.6 Other features............................................................................................................................................... 12
2.1.5 Interfaces ..................................................................................................................................... 13
2.1.6 Power consumption ..................................................................................................................... 13
2.1.6.1 TANGO-900/1800-X..................................................................................................................................... 13
2.1.6.2 TANGO-900/1800-X-G2 .............................................................................................................................. 14
2.1.6.3 TANGO-900/1800-X –G10........................................................................................................................... 15
2.1.7 Temperature Range...................................................................................................................... 15
2.1.8 RF characteristics......................................................................................................................... 16
2.1.8.1 Receiver........................................................................................................................................................ 16
2.1.8.2 Transmitter................................................................................................................................................... 16
2.1.8.3 Determining the External Equipment Type .................................................................................................. 16
2.1.9 Interfaces ..................................................................................................................................... 17
2.1.9.1 Interface A (4-pin connector) ....................................................................................................................... 18
2.1.9.2 Interface B (9-pin D-SUB connector)........................................................................................................... 19
2.1.9.3 Interface C (8-pin RJ45 connector).............................................................................................................. 20
2.1.9.4 Interface D (antenna interface) .................................................................................................................... 21
2.1.9.5 Interface E (SIM interface)........................................................................................................................... 21
2.1.9.6 Interface F (Optical indicator interface)...................................................................................................... 22
2.2 FUNCTIONAL DESCRIPTION ........................................................................................................... 22
2.2.1 Ignition line.................................................................................................................................. 23
2.2.2 Serial handling............................................................................................................................. 23
2.2.3 Reset configuration...................................................................................................................... 24
3 GENERAL GUIDELINES FOR THE USE OF THE
TANGO .............................................................................25
3.1 GETTING STARTED........................................................................................................................ 25
3.2 HARDWARE & SOFTWARE REQUIREMENTS ................................................................................... 25

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Page 2
3.2.1 Minimum hardware interface to get started ................................................................................. 25
3.2.1.1 Connecting the external antenna (SMB type)............................................................................................... 25
3.2.1.2 Installing the SIM card................................................................................................................................. 26
3.2.1.3 Connecting the Modem to external device cable .......................................................................................... 26
3.2.1.4 Connecting the DC power supply................................................................................................................. 27
3.2.1.5 Mounting the terminal.................................................................................................................................. 28
3.2.1.6 Placing the terminal..................................................................................................................................... 28
3.2.2 Terminal emulator setup .............................................................................................................. 29
3.2.2.1 Checking the Modem (using Microsoft Windows™ Hyper Terminal as example) ....................................... 29
3.2.3 Getting started to GPRS Network................................................................................................ 31
3.2.4 Adding a Modem ......................................................................................................................... 31
3.2.4.1 Making a dial-up networking ....................................................................................................................... 34
3.2.5 Making a dial-up networking....................................................................................................... 35
3.3 COMMUNICATIONS SOFTWARE ..................................................................................................... 40
3.4 BASIC OPERATION........................................................................................................................ 41
3.4.1 Troubleshooting........................................................................................................................... 42
4 HOUSING .........................................................................44
4.1 HOUSING OF CRADLE .................................................................................................................... 45
5 APPENDIX .......................................................................46
5.1 RECOMMENDATIONS FOR POWER SUPPLY..................................................................................... 46
5.1.1 External cable for power supply .................................................................................................. 46
5.2 POSSIBLE EXTERNAL DEVICES: ..................................................................................................... 47
5.2.1 Operation of the active receiver................................................................................................... 48
5.2.2 Interface....................................................................................................................................... 48
5.3 POSSIBLE EXTERNAL ANTENNA .................................................................................................... 49
5.4 POSSIBLE EXTERNAL HEADSET ..................................................................................................... 49
Version history:
Version number Author Changes
1.00 F. Beqiri Initial version
1.01 F. Beqiri Average current in GPRS Mode
added.
1.02 F. Beqiri New chapters added (3.2.1.5,
3.2.1.6 and 3.3)
New sections added ()
Housing of cradle (figure 42)
optimize.
1.03 F. Beqiri Chapter “Firmware update”
removed.
1.04 F. Beqiri Table 1 updated.
Determination for DTE or DCE
connection (Chapter 2.1.8.3)
added.

TANGO VERSION 1.04
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Page 3
Cautions
Information furnished herein by FALCOM are accurate and reliable.
However, no responsibility is assumed for its use.
Please read carefully the safety precautions.
If you have any technical questions regarding this document or the
product described in it, please contact your distributor.
General information about FALCOM and its range of products is
available at the following internet address: http://www.falcom.de/
Trademarks
Some mentioned products are registered trademarks of their respective
companies.
Copyright
The TANGO user’s guide is copyrighted by FALCOM GmbH with all
rights reserved. No part of this user’s guide may be produced in any form
without the prior written permission of FALCOM GmbH.
FALCOM GmbH.
No patent liability is assumed with respect to the use of the information
contained herein.

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Page 4
0Introduction
This manual is focussed on the GSM and GSM/GPRS data solutions of the
TANGO series from FALCOM GmbH.
TANGO as a Plug-and-Play Dual Band GSM/GPRS device with an
integrated SIM card holder, an external antenna connector and standard
connector interfaces, provide a quick and easy way to plug in GSM and
GPRS functionality to systems and terminals. It can be directly connected
via RS232 interface to the serial port of a desktop or notebook computer. A
standard SIM card can be inserted in the integrated card holder. The modem
can send and receive data by GSM and GPRS network. It supports SMS and
Fax as well as voice calls. The TANGO can be easily controlled by using
AT command for all kinds of operations.
Available in dual-band configurations, this full type approved integrated
modem constitutes a self contained, fully integrated implementation of the
GSM/GPRS standard.
TANGO supports GPRS Class B, class 2 (making download at speeds up to
28.8 kbps) as well as Class B, class 10 (making download at speeds up to 56
kbps).
About GPRS:
GPRS is standard for General Packet Radio Service that is an add-on to
the GSM (Global System for Mobile Communications) cellular network -
a type of network used to provide cellular phone service.
The TANGO Modem provides reliable data connections to GPRS 900
MHz and 1800 MHz as well as to GPRS 850 MHz and 1900 MHz
networks. When in regions where GPRS is not available, user can still
access their important information with GSM 14.4 kbps data
connections.
Table below shows the different versions of the TANGO series.
DEVICE DISCRIPTION AVAILABILITY
TANGO-900/1800-1 GSM only, SMB-male antenna connector Now
TANGO-900/1800-1-G10 GSM/GPRS Class B/multi-slot class 10,
SMB-male antenna connector Now
TANGO-900/1800-1-G2 GSM/GPRS Class B/multi-slot class 2,
SMB-male antenna connector Now
TANGO-900/1800-2 GSM only, FME-female antenna connector Now
TANGO-900/1800-2-G10 GSM/GPRS Class B/multi-slot class 10,
FME-female antenna connector Now
TANGO-900/1800-2-G2 GSM/GPRS Class B/multi-slot class 2,
FME-female antenna connector Now
TANGO-850/1900-1 GSM only, SMB-male antenna connector Available soon

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Page 5
DEVICE DISCRIPTION AVAILABILITY
TANGO-850/1900-1-G10 GSM/GPRS Class B/multi-slot class 10,
SMB-male antenna connector Available soon
TANGO-850/1900-1-G2 GSM/GPRS Class B/multi-slot class 2,
SMB-male antenna connector Available soon
TANGO-850/1900-2 GSM only, FME-female antenna connector Available soon
TANGO-850/1900-2-G10 GSM/GPRS Class B/multi-slot class 10,
FME-female antenna connector Available soon
TANGO-850/1900-2-G2 GSM/GPRS Class B/multi-slot class 2,
FME-female antenna connector Available soon
Table 1: TANGO series.
Users are advised to quickly proceed to the “Security” chapter and read
the hints carefully.
0.1 Scope of the user’s guide
This document describes the hardware interface and the technical
specifications of the TANGO modem.
This product is based on a Dual Band GSM/GPRS engine: every integrated
modem referenced TANGO-900/1800 includes a GSM/GPRS 900/1800
MHz module and every integrated modem referenced TANGO-850/1900
includes a GSM/GPRS 850/1900 MHz module.
These two dual-band modems have the same specifications unless otherwise
specified. As far as network operation is concerned, the TANGO has two
versions. The first one is only GSM and the second one is GSM/GPRS
modem. The GSM and GSM/GPRS versions have the same specifications
unless otherwise specified.

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Page 6
0.2 Used abbreviations
Abbreviation Description
ETSI European Telecommunications Standards Institute
GSM Global System for Mobile communications
IMEI International Mobile station Equipment Identity
ME Mobile Equipment
GPRS General Packet Radio Service
PLMN Public Land Mobile Network
PIN Personal Identification Number
PUK Personal Unblocking Key
RP Receive Protocol
RXQUAL Received Signal Quality
SIM Subscriber Identity Module
SMS Short Message Service
SMS/PP Short Message Service/Point-to-Point
TA Terminal Adapter
TE Terminal Equipment
TP Transmit Protocol
0.3 Related documents
•ETSI GSM 07.05 “Use of Data Terminal Equipment - Data Circuit
terminating Equipment interface for Short Message
Service and Cell Broadcast Service“
•ETSI GSM 07.07 “AT command set for GSM Mobile Equipment”
•ITU-T V.25ter “Serial asynchronous automatic dialling and
control”

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Page 7
1Security
IMPORTANT FOR THE EFFICIENT AND SAFE OPERATION OF
YOUR GSM/GPRS MODEM READ THIS INFORMATION BEFORE
USE !
Your GSM or GSM/GPRS modem is one of the most exciting and
innovative electronic products ever developed. With it you can stay in
contact with your office, your home, emergency services, and others,
wherever service is provided.
1.1.1 GENERAL
Your modem utilises the GSM standard for cellular technology. GSM is a
newer radio frequency (« RF ») technology than the current FM technology
that has been used for radio communications for decades. The GSM
standard has been established for use in the European community and
elsewhere.
Your modem is actually a low power radio transmitter and receiver. It sends
out and receives radio frequency energy. When you use Your modem, the
cellular system handling your calls controls both the radio frequency and the
power level of your cellular modem.
1.1.2 EXPOSURE TO RF ENERGY
There has been some public concern about possible health effects of using
GSM or GSM/GPRS modem. Although research on health effects from RF
energy has focused for many years on the current RF technology, scientists
have begun research regarding newer radio technologies, such as GSM.
After existing research had been reviewed, and after compliance to all
applicable safety standards had been tested, it has been concluded that the
product is fit for use.
If you are concerned about exposure to RF energy there are things you can
do to minimise exposure. Obviously, limiting the duration of your calls will
reduce your exposure to RF energy. In addition, you can reduce RF
exposure by operating your cellular modem efficiently by following the
below guidelines.
1.1.3 EFFICIENT MODEM OPERATION
For Your modem to operate at the lowest power level, consistent with
satisfactory call quality:
If Your modem has an extendible antenna, extend it fully. Some models
allow you to place a call with the antenna retracted. However Your modem
operates more efficiently with the antenna fully extended.
Do not hold the antenna when the modem is « IN USE ». Holding the
antenna affects call quality and may cause the modem to operate at a higher
power level than needed.

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1.1.4 ANTENNA CARE AND REPLACEMENT
Do not use the modem with a damaged antenna. If a damaged antenna
comes into contact with the skin, a minor burn may result. Replace a
damaged antenna immediately. Consult your manual to see if you may
change the antenna yourself. If so, use only a manufacturer-approved
antenna. Otherwise, have your antenna repaired by a qualified technician.
Use only the supplied or approved antenna. Unauthorised antennas,
modifications or attachments could damage the modem and may contravene
local RF emission regulations or invalidate type approval.
1.1.5 DRIVING
Check the laws and regulations on the use of cellular devices in the area
where you drive. Always obey them. Also, when using Your modem while
driving, please: give full attention to driving, pull off the road and park
before making or answering a call if driving conditions so require. When
applications are prepared for mobile use they should fulfil road-safety
instructions of the current law!
1.1.6 ELECTRONIC DEVICES
Most electronic equipment, for example in hospitals and motor vehicles is
shielded from RF energy. However RF energy may affect some
malfunctioning or improperly shielded electronic equipment.
1.1.7 VEHICLE ELECTRONIC EQUIPMENT
Check your vehicle manufacturer’s representative to determine if any on
board electronic equipment is adequately shielded from RF energy.
1.1.8 MEDICAL ELECTRONIC EQUIPMENT
Consult the manufacturer of any personal medical devices (such as
pacemakers, hearing aids, etc...) to determine if they are adequately shielded
from external RF energy.
Turn Your modem OFF in health care facilities when any regulations
posted in the area instruct you to do so. Hospitals or health care facilities
may be using RF monitoring equipment.
1.1.9 AIRCRAFT
Turn Your modem OFF before boarding any aircraft.
Use it on the ground only with crew permission.
Do not use in the air.
To prevent possible interference with aircraft systems, Federal Aviation
Administration (FAA) regulations require you to have permission from a
crew member to use Your modem while the plane is on the ground. To
prevent interference with cellular systems, local RF regulations prohibit
using Your modem whilst airborne.

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Page 9
1.1.10 CHILDREN
Do not allow children to play with Your modem. It is not a toy. Children
could hurt themselves or others (by poking themselves or others in the eye
with the antenna, for example). Children could damage the modem, or make
calls that increase Your modem bills.
1.1.11 BLASTING AREAS
To avoid interfering with blasting operations, turn your unit OFF when in a
« blasting area » or in areas posted : « turn off two-way radio ».
Construction crew often use remote control RF devices to set off explosives.
1.1.12 POTENTIALLY EXPLOSIVE ATMOSPHERES
Turn Your modem OFF when in any area with a potentially explosive
atmosphere. It is rare, but Your modem or its accessories could generate
sparks. Sparks in such areas could cause an explosion or fire resulting in
bodily injury or even death.
Areas with a potentially explosive atmosphere are often, but not always,
clearly marked. They include fuelling areas such as petrol stations ; below
decks on boats ; fuel or chemical transfer or storage facilities ; and areas
where the air contains chemicals or particles, such as grain, dust, or metal
powders.
Do not transport or store flammable gas, liquid, or explosives, in the
compartment of your vehicle which contains Your modem or accessories.
Before using Your modem in a vehicle powered by liquefied petroleum gas
(such as propane or butane) ensure that the vehicle complies with the
relevant fire and safety regulations of the country in which the vehicle is to
be used.
1.1.13 NON-IONISING RADIATION
As with other mobile radio transmitting equipment, users are advised that
for satisfactory operation and for the safety of personnel, it is recommended
that no part of the human body be allowed to come too close to the antenna
during operation of the equipment.
The radio equipment shall be connected to the antenna via a non-radiating
50Ohm coaxial cable.
The antenna shall be mounted in such a position that no part of the human
body will normally rest close to any part of the antenna. It is also
recommended to use the equipment not close to medical devices as for
example hearing aids and pacemakers.

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Page 10
1.2 Safety standards
THIS CELLULAR MODEM COMPLIES WITH ALL APPLICABLE
RF SAFETY STANDARDS.
This cellular modem meets the standards and recommendations for the
protection of public exposure to RF electromagnetic energy established
by governmental bodies and other qualified organisations, such as the
following :
-Directives of the European Community, Directorate General V in
Matters of Radio Frequency Electromagnetic Energy.

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Page 11
2General characteristics
2.1.1 General
•Dual Band GSM/GPRS modem E-GSM 900/1800 MHz or E-GSM
850/1900 MHz
•Class 4 (2W at 850/900 MHz)
•Class 1 (1W at 1800/1900 MHz)
•Small size and low power consumption
•Voice, SMS
•Fax and data transmission without extra hardware
•Tricodec (FR/EFR/HR)
•Internal 3V SIM interface
•Easy remote control by AT commands for dedicated applications
•Fully Type Approved according to GSM Phase 2+ specifications
•Fully shielded and ready-to-use
2.1.2 Electrical
Power supply: 10.8 ... 31.2 V DC (absolute maximum
ratings) for more details refer to the
chapter 2.1.6 “Power consumption” (table
2 to 7)
2.1.3 Physical
Absolute maximum dimension: 115 mm x 52 mm x 26.6 mm (L x B x H)
Weight: 82.6 g (with SMB connector)
88.0 g (with FME connector)
Absolute maximum
dimension of cradle: 119.4mm x 66.7mm x 31.8mm(L x B x H)
Weight of cradle: 21 gr
Casing: Complete shielding (Chromium-plate
ABS)
Mounting: through 2 screw holes on the cradle
Operating temperature range: -20°C to + 55°C
Functional temperature: -20°C to + 70°C
Storage temperature: -30°C to + 85°C
2.1.4 Basic Features
2.1.4.1 Telephony
•Telephony (TCH/FS) & Emergency calls
•Full Rate, Enhanced Full Rate and Half Rate
•Dual Tone Multi Frequency function (DTMF)

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Page 12
2.1.4.2 Short Message Service (GSM and GPRS mode)
•Text and PDU
•Point to point MT & MO
•SMS Cell Broadcast
2.1.4.3 GSM circuit Data Features
•Data circuit asynchronous, transparent and non transparent up to
14,400 bits/s
•Automatic fax group 3 (Class 1 & 2)
•Alternate speech and fax
•MNP2, V.42bis
2.1.4.4 GPRS Packet Data Features
•GPRS Class B Class 2 (up to 28.8 kbps) or GPRS Class B Class 10
(up to 56 kbps)
•Coding Schemes: CS1 to CS4
•Compliant with SMG31bis
2.1.4.5 GSM Supplementary services
•Call Forwarding
•Call Barring
•Multiparty
•Call Waiting and Call Hold
•Calling Line Identity
•Advice of Charge
•USSD
•Closed User Group
•Explicit Call Transfer
2.1.4.6 Other features
•ME+SIM phone book management
•Fixed Dialling Number
•SIM Toolkit Class 2
•SIM, network and service provider locks
•Real Time Clock
•UCS2 character set management

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Page 13
2.1.5 Interfaces
Single antenna interface: SMB or FME antenna connector.
Internal SIM interface: 3V only
For Data Operation: RS-232C serial link
Remote control by AT commands (GSM 07.07
and 07.05)
Serial baud rate from 300 to 115,200 bits/s
Autobauding (300 up to 38400 bits/s)
Audio: RJ45 serial link (microphone and speaker)
2.1.6 Power consumption
2.1.6.1 TANGO-900/1800-X
Average current (in mA at 12 VDC):
900 1800 GSM band
31 31 in idle mode (base station sends at -85 dBm)
125 96 in transmit mode at power level 7/3
162 118 in transmit mode at power level 5/0 (maximum)
GSM
Serial interface is applied and working.
25 mA (off)
IF MODEM IS SWITCHED OFF (BY AT+CPOF OR AT+CFUN=0),
BUT POWER IS STILL SUPPLIED.
(Serial interface is applied and working)
Table 2: Power consumption at 12 VDC.
Average current (in mA at 24 VDC):
900 1800 GSM band
18 18 in idle mode (base station sends at -85 dBm)
67 50 in transmit mode at power level 7/3
88 64 in transmit mode at power level 5/0 (maximum)
GSM
Serial interface is applied and working.
Table 3: Power consumption at 24 VDC.

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2.1.6.2 TANGO-900/1800-X-G2
Average current (in mA at 12 VDC):
900 1800 GSM band
31 31 in idle mode (base station sends at -85 dBm)
123 103 in transmit mode at power level 7/3
158 127 in transmit mode at power level 5/0 (maximum)
GSM
Serial interface is applied and working.
GPRS 160.36 mA in transmit mode at power level 5
25 mA (off)
IF MODEM IS SWITCHED OFF (BY AT+CPOF OR AT+CFUN=0),
BUT POWER IS STILL SUPPLIED.
(Serial interface is applied and working)
Table 4: Power consumption at 12 VDC.
Average current (in mA at 24 VDC):
900 1800 GSM band
16 16 in idle mode (base station sends at -85 dBm)
67 54 in transmit mode at power level 7/3
84 68 in transmit mode at power level 5/0 (maximum)
GSM
Serial interface is applied and working.
GPRS 84.46 mA in transmit mode at power level 5
Table 5: Power consumption at 24 VDC.

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2.1.6.3 TANGO-900/1800-X –G10
Average current (in mA at 12 VDC):
900 1800 GSM band
32 32 in idle mode (base station sends at -85 dBm)
118 110 in transmit mode at power level 7/3
147 138 in transmit mode at power level 5/0 (maximum)
GSM
Serial interface is applied and working.
GPRS 257.06 mA in transmit mode at power level 5
25 mA (off)
IF MODEM IS SWITCHED OFF (BY AT+CPOF OR AT+CFUN=0),
BUT POWER IS STILL SUPPLIED.
(Serial interface is applied and working)
Table 6: Power consumption at 12 VDC.
Average current (in mA at 24 VDC):
900 1800 GSM band
17 17 in idle mode (base station sends at -85 dBm)
62 57 in transmit mode at power level 7/3
78 74 in transmit mode at power level 5/0 (maximum)
GSM
Serial interface is applied and working.
GPRS 132.22 mA in transmit mode at power level 5
Table 7: Power consumption at 24 VDC.
2.1.7 Temperature Range
Operating temperature range: -20°C to + 55°C
Functional temperature: -20°C to + 70°C
Storage temperature: -30°C to + 85°C

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2.1.8 RF characteristics
2.1.8.1 Receiver
EGSM Sensitivity : <-104 dBm
DCS Sensitivity : <-100 dBm
Selectivity @ 200 kHz : > + 9 dBc
Selectivity @ 400 kHz : > +41 dBc
Dynamic range : 62 dB
Intermodulation : >- 43 dBm
Co-channel rejection : > = 9 dBc
2.1.8.2 Transmitter
Maximum output power (EGSM) : 33dBm ±2dB
Maximum output power (DCS) : 30dBm ±2dB
Minimum output power (EGSM) : 5dBm ±5dB
Minimum output power (DCS) : 0dBm ±5dB
H2 level : < -30dBm
H3 level : < -30dBm
Noise in 925 - 935 MHz : < -67dBm
Noise in 935 - 960 MHz : < -79dBm
Noise in 1805 - 1880 MHz : < -71dBm
Phase error at peak power : < 5 ° RMS
Frequency error : +/- 0.1ppm max
2.1.8.3 Determining the External Equipment Type
Before you connect the DB9 serial port connectors on the aforementioned
terminals (DCE units) to external equipment, you need to determine if the
external hardware serial ports are configured as DTE or DCE.
The terms DTE (Data Terminal Equipment) and DCE (Data
Communications Equipment) are typically used to describe serial ports on
devices. Computers (PCs) generally use DTE connectors and
communication devices such as modems and DSU/CSU devices generally
use DCE connectors. As a general rule, DTE ports connect to DCE ports via
straight through pinned cables. In other words, a DTE port never connects
directly to another DTE port. Similarly, a DCE port never connects directly
to another DCE port. The signalling definitions were written from the
perspective of the DTE device; therefore, a Receive Data signal becomes an
input to DTE but an output from DCE.
All TANGO series are designed for use as a DCE unit. Based on the
aforementioned conventions for DCE-DTE connections it communicates
with the customer application (DTE) using the following signals:

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TANGO Terminal (DCE) to Application (DTE)
TxD ----------------------- TXD
RxD -----------------------RXD
RTS ----------------------- RTS
CTS -----------------------CTS
DTR ----------------------- DTR
DSR -----------------------DSR
DCD -----------------------DCD
RING -----------------------RING
Table 8: The signaling definitions between DTE and DCE.
2.1.9 Interfaces
Interface specifications
Interface A 4-pin Micro-Fit™ 3.0 Molex
Part number: 43045-0406 (Female)
Interface B Standard RS232 serial interface
Interface C Audio 8-pin RJ45, RS232 (Rx, Tx) serial interface
Interface D GSM antenna with SMB or FME antenna connector.
Interface E SIM card reader for small SIM cards (3V)
Interface F LED’s for status indication
Table 9: Interface specifications of the Modem

TANGO VERSION 1.04
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Page 18
Figure 1: view of TANGO interfaces.
2.1.9.1 Interface A (4-pin connector)
Figure 2: Pin out of 4-pin power supply connector (interface A)
Power input: 10,8....31,2 V DC
Pin number Name Functions
1GND DC power negative input
2Mute Do not connect
3IGN Ignition (connected to positive DC power)
4POWER (+Vin) DC power positive input
Table 9: Description of modem power connector
A cable, included in the package shall be used for power supply connection.
For more deteils see Appendix chapters 5.1 and 5.1.1.

TANGO VERSION 1.04
This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.
Page 19
2.1.9.2 Interface B (9-pin D-SUB connector)
Interface B has the highest priority connection to control the TANGO
modem. This one has a standard D-SUB-male serial connector.
RS232 9 pin D-Sub to DIN 41652
+/-12V RX, TX, RTS, CTS, DTR, DSR, DCD, RI
300...115200 Baud rates for serial link (2400...19200 with auto-bauding)
Interface B (DB9 connector) has the following layout.
Figure 3: RS232 pin-out (interface B)
Pin Description Direction
1DCD Data Carrier Detect OUT
2RxD Received Data OUT
3TxD Transmitted Data IN
4DTR Data Terminal Ready IN
5GND Signal Ground -
6DSR Data Set Ready OUT
7RTS Request To Send IN
8CTS Clear To Send OUT
9 RI Ring Indicator OUT
Table 10: Pin assignment of the standard RS232 connector