Telit Communications S p A GM862G Users Guide
TELIT GM862-GPS
Quad Band GPS Data Terminal Module
TECHNICAL
MANUAL
Code: 1vv0300730
Rev. 0
May. 20, 2006
TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
REVISION INDEX
REV. SUBJECT OF MODIFICATION DATE
Rev. 0
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
Rev. 0
MASTER INDEX
1 INTRODUCTION ................................................................................... 4
2 MECHANICAL VIEW ............................................................................ 6
2.1 Mechanical view of Telit GM862-GPS module................................................................. 6
3 TECHNICAL SPECIFICATIONS........................................................... 7
3.1 GM862-GPS Transceiver Module..................................................................................... 8
3.2 Environmental requirements ........................................................................................... 11
3.3 Transceiver module interface connectors .......................................................................12
3.4 Audio levels specifications ..............................................................................................13
3.5 Interface connector.......................................................................................................... 15
3.6 Mechanical characteristics.............................................................................................. 18
3.7 GM862-GPS Data Terminal System............................................................................... 19
3.8 EMC ................................................................................................................................ 22
3.9 Camera support............................................................................................................... 22
3.10 Software Features........................................................................................................... 23
3.11 Jammed Detect & Report Extension............................................................................... 30
3.12 Easy Script Extension - Python interpreter...................................................................... 31
3.13 Python implementation description .................................................................................33
3.14 AT Commands ................................................................................................................50
3.15 GPS Receiver characteristic ...........................................................................................55
3.16 Conformity Assessment Issues...................................................................................... 57
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
Rev. 0
1 INTRODUCTION
The Telit GM862-GPS Quad Band GSM-GPRS Data Terminal Module is a small,
lightweight and low power consumption device that allow digital communication services
wherever there is a GSM - GPRS 850 MHz, 900 MHz, 1800 MHz or PCS 1900 MHz
network with an integrated GPS receiver.
The Telit GM862-GPS includes a 20 channels GPS receiver. It provides all the features of
the Telit GM862 family versions such as Voice, Circuit Switched Data transfer,
Phonebook, SMS, four bands GSM capability, hot removal sensing on board SIM Reader,
GPRS Class 10 and battery charger circuitry.
Moreover, the Telit GM862-GPS integrates the “EASY SCRIPT “ functionality. This is a
PYTHON engine script interpreter allowing self-controlled operations.
It is specifically designed and developed for OEM usage and dedicated to portable data,
voice and telematics applications needing the added triband and GPRS Class 10
improved speed features and the battery charger such as:
• Fast Worldwide GPRS Telemetry and Telecontrol (SCADA applications)
• Worldwide Smart GPRS Security systems
• Worldwide Smart GPRS Vending machines
• Fast Worldwide GPRS POS terminals
• Worldwide PDAs
• Worldwide Phones and Payphones
• Worldwide Smart Automotive and Fleet Management applications
• Battery powered applications needing a battery charger
Moreover, for the GM862-GPS:
• Automotive and Fleet Management applications
• Position reporting and tracking
The Telit GM862-GPS module is specifically designed and developed for OEM usage and it is
intended to be installed inside an equipment.
The Telit GM862-GPS family modules is LEAD FREE Green products compliant with
RoHS directive.
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Telit GM862-GPS
Quad Band GPS Data Terminal Module
Rev. 0
The design and development of the Telit GM862-GPS module is in line with the following
documents:
3GPP TS 51.010–1 GSM/EDGE Radio Access Network; Digital cellular
telecommunications system (Phase 2+): Mobile Station (MS) Conformance Specification;
Part 1. Conformance Specification.
EN 301 511 Global system for mobile communications (GSM); Harmonised standard
for mobile stations in the GSM 900 and DCS 1800 bands covering essential requirements
under Article 3(2) of the R&TTE directive (1999/5/EC).
EN 60950 Safety of information technology equipment, including business equipment.
EN 301 489–07 Electromagnetic compatibility and radio spectrum matters (ERM);
Electromagnetic compatibility (EMC) standard for radio equipment and services;
Part 7: Specific conditions for mobile and portable radio and ancillary equipment of digital
cellular radio telecommunications systems (GSM and DCS).
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
2 MECHANICAL VIEW
2.1 Mechanical view of Telit GM862-GPS module.
Rev. 0
GPS antenna connector
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TECHNICAL MANUAL
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Telit GM862-GPS
Quad Band GPS Data Terminal Module
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3 TECHNICAL SPECIFICATIONS
Herein will be described the technical characteristics of GM862-GPS Transceiver Module.
The block diagram in Figure 1 shows the interconnection between GM862-GPS
Transceiver and Other Equipment Manufacturer Hardware.
Internal
Power supply
SIM
CARD
reader
Charger Input
RX-TX connector
GPS RF connector
/D Connect
Camera Interface
QUAD BAND
RFsection
GPIO 1-7
BB Processing
E-Gold Lite
RS232 UART data
Handset AUDIO path
GPS section
Handsfree AUDIO path
RS232 NMEA data
Figure 1 GM862-GPS Transceiver.
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
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3.1 GM862-GPS Transceiver Module
The GM862-GPS Transceiver Module is a Quad Band GSM - GPRS class 10 (4 down 2
up) based on Lite Infineon chipset and PV Lite internal SW platform with SiRF GSC3F
GPS chipset, on low profile compact shielded assembly with connections for GSM RX/TX
antenna, GPS antenna and data/service connector for all functional and interface signals.
The module is provided with an on board SIM Holder.
3.1.1 Electric Characteristics
3.1.1.1 Supply voltage
The external power supply must be connected to the VBATT signal and must fulfill the
following requirements:
• Nominal operating voltage: 3.8 V
• Operating voltage range: 3.4 V - 4.2 V
3.1.2 Power consumption
The typical current consumption of the GM862-GPS module is:
• Power off current (typical) < 36 μA;
• Stand–by current (power saving) < 20 mA
• Operating current in voice ch. 170 mA
• Operating current in voice ch. < 270 mA
• Operating current GPRS class 10 < 500 mA
• GPS Receiver consumption < 60 mA
• GPS Receiver (power saving) 1 mA
rms
(< 5 mA
rms
@ typical network conditions
rms
1.9 A
rms
@ worst network conditions
rms
rms
using command AT+CFUN)
rms
@ worst network conditions
peak
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
3.1.3 Embodied Battery charger
The battery charger is suited for 3.7V Li-Ion rechargeable battery (suggested capacity 5001000mAh). The Charger needs only a CURRENT LIMITED power source input and
charges the battery directly through VBATT connector pins.
• Battery charger input pin: CHARGE
• Battery pins: VBATT, GND
• Battery charger input voltage min: 5.0 V
• Battery charger input voltage typ: 5.5 V
• Battery charger input voltage max: 7.0 V
• Battery charger input current max: 400mA
• Battery type: Rechargeable Li-Ion
NOTE: If embodied battery charger is used, then a LOW ESR capacitor of at least 100μF
must be mounted in parallel to VBATT lines.
NOTE: when power is supplied to the CHARGE lines, a battery must always be connected
to the VBATT pin of the module.
Rev. 0
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
3.1.4 Radio Electric Characteristics
3.1.4.1 Operating frequencies
The standard operating frequencies are conforming to the ETSI GSM specifications.
Mode Freq. TX (MHz) Freq. RX (MHz) Channels (ARFC) TX - RX offset
E-GSM-900 890.0 - 914.8 935.0 - 959.8 0 – 124 45 MHz
880.2 - 889.8 925.2 - 934.8 975 - 1023 45 MHz
GSM-850 824.2 - 848.8 969.2 - 893.8 128 - 251 45 MHz
DCS-1800 1710.2 - 1784.8 1805.2 - 1879.8 512 – 885 95 MHz
PCS-1900 1850.2 - 1909.8 1930.2 - 1989.8 512 - 810 80 MHz
3.1.4.2 Transmitter output power
GSM–850
The GM862-GPS transceiver module in GSM–850 operating mode is class 4 in
accordance with the specification that set the nominal 2W peak RF power (+33dBm) on 50
Ohm.
GSM–900
The GM862-GPS transceiver module in GSM–900 operating mode is class 4 in
accordance with the specification that set the nominal 2W peak RF power (+33dBm) on 50
Ohm.
DCS–1800
The GM862-GPS transceiver module in DCS–1800 operating mode is class 1 in
accordance with the specifications that set the nominal 1W peak RF power (+30dBm) on
50 Ohm.
PCS–1900
The GM862-GPS transceiver module in PCS–1900 operating mode is class 1 in
accordance with the specifications that set the nominal 1W peak RF power (+30dBm) on
50 Ohm.
Rev. 0
3.1.4.3 Reference sensitivity
GSM–850
The sensitivity of the GM862-GPS transceiver module according to the specifications for
the class 4 GSM–850 portable terminals is better than –102dBm in all the operational
conditions.
GSM–900
The sensitivity of the GM862-GPS Transceiver module according to the specifications, for
the class 4 GSM–900 portable terminals is better than –102dBm in all the operational
conditions. The static sensitivity is better than –105dBm in all the operational conditions.
DCS–1800
The sensitivity of the GM862- GPS Transceiver module according to the specifications, for
the class 1 portable terminals DCS 1800 is better than –102dBm in normal operating
conditions. The static sensitivity is better than –105dBm in all the operational conditions.
PCS–1900
The sensitivity of the GM862- GPS Transceiver module according to the specifications, for
the class 1 portable terminals PCS 1900 is better than –102dBm in normal operating
conditions. The static sensitivity is better than –105dBm in all the operational conditions.
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
3.2 Environmental requirements
The GM862-GPS module is compliant with the applicable ETSI reference documentation
GSM 05.05 Release 1999 ETSI EN300910 V8.4.1.
3.2.1 Climatic requirements
The table describes a set of environmental characteristics that the platform must satisfy:
Requirement IEC Test Condition
Functional temperature 60068-2-1 Ad Cold
Functional temperature 60068-2-2
Not functional temperature 60068-2-1 Aa Cold
Not functional temperature 60068-2-2 Ba Heat
Not funct. Temp. Change 60068-2-14
Not functional dampness 60068-2-56
3.2.2 Temperature range
Bd Heat
Nb Change of
Temperature
Cb Damp heat
steady state
-25 °C
+75 °C
-40 °C
+85 °C
5 cycles -25÷+30°C
93% UR at +40°C
Rev. 0
• Temperature in normal functional conditions: –30°C ÷ +80°C
•
Temperature in storage conditions: –30°C ÷ +85°C
3.2.3 Vibration Test (non functional)
• 10 ÷12Hz ASD = 1.92m 2 /s 3
• 12 ÷ 150Hz –3dB/oct
3.2.4 SIM Card Reader
The GM862-GPS Transceiver module supports a 3 volts small type SIM card, through the
internal SIM Card Reader or through the suitable signals on the interface connector pins.
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Telit GM862-GPS
Quad Band GPS Data Terminal Module
3.3 Transceiver module interface connectors
3.3.1 Antenna GSM-GPS connectors
The Telit GM862-GPS Transceiver module includes two 50 Ohm MMCX coaxial female 2
pin Angle Coax SMD J01341A0081 connectors to allow the GSM RF antenna and the
GPS antenna connection.
SIM Holder connecto
Rev. 0
GPS antenna
Picture 2: GSM and GPS Antenna coax connectors
GSM antenna
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Telit GM862-GPS
Quad Band GPS Data Terminal Module
3.3.2 GSM Antenna requirements
The GSM antenna that the customer chooses to use, depending on his application, should
fulfill the following requirements:
Rev. 0
Frequency range
Bandwith
Gain
Impedance
Input power
VSWR absolute max
VSWR recommended
3.3.3 GPS Antenna requirements
The GPS antenna that the customer chooses to use, depending on his application, should
fulfill the following requirements:
Frequency range
Bandwith
Gain
Impedance
Supply voltage
Power consumption
3.3.4 SIM Card connector
The Telit GM862-GPS Transceiver module includes two models of SIM CARD connector
one “Push-Push” connector for normal applications or a Hinged Cover connector for
automotive applications.
3.4 Audio levels specifications
The audio of the Telit GM862 GPS, module is organized into two main paths:
• internal path (called also MT)
• external path (called also HF)
These two paths are meant respectively for handset and headset/handsfree use.
The Telit GM862 GPS module has a built in echo canceller and a noise suppressor, tuned
separately for the two audio paths; for the internal path the echo canceller parameters are
suited to cancel the echo generated by a handset, while for the external audio path they
are suited for a handsfree use.
For more information on the audio refer to the Hardware User Guide.
The following tables report all the audio level specifications.
Standard QUAD Band frequency range,
80 MHz in GSM & 170 MHz in DCS & 140 MHz PCS band
1.5dBi ≤ Gain < 3dBi
50 ohm
> 2 W peak power
<= 10:1
<= 2:1
GPS = 1575.42MHz
GPS band
Typical 25dB (Max 27 dB)
50 ohm
Nominal 3.8V range 3.4V up to 4.2V
40mA max
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
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“Mic_MT” 1
st
differential microphone path
• line coupling AC
• line type balanced
• coupling capacitor ≥ 100nF
• differential input resistance 50kΩ
• differential input voltage ≤ 1,03Vpp (365mV
• microphone nominal sensitivity -45 dBV
/Pa
rms
rms
)
• analog gain suggested + 20dB
• echo canceller type handset
“Mic_HF” 2nd differential microphone path
• line coupling AC
• line type balanced
• coupling capacitor ≥ 100nF
• differential input resistance 50kΩ
• differential input voltage ≤ 65mVpp (23mV
• microphone nominal sensitivity -45 dBV
/Pa
rms
rms
)
• analog gain suggested +10dB
• echo canceller type car kit hands-free
Speaker characteristics
“Ear_MT” Differential Line-out Drivers Path
• line coupling: DC
• line type: bridged
• output load resistance : ≥ 14 Ω
• internal output resistance: 4 Ω (typical)
• signal bandwidth: 150 - 4000 Hz @ -3 dB
• max. differential output voltage 1310 mV
(typ, open circuit)
rms
• differential output voltage 328mVrms /16 Ω @ -12dBFS
• SW volume level step - 2 dB
• number of SW volume steps 10
“Ear_HF” Power Buffers
path
• line coupling: DC
• line type: bridged
• output load resistance : ≥ 14 Ω
• internal output resistance: 4 Ω ( >1,7 Ω )
• signal bandwidth: 150 - 4000 Hz @ -3 dB
• max. differential output voltage 1310 mV
• max. single ended output voltage 656 mV
(typ, open circuit)
rms
(typ, open circuit)
rms
• SW volume level step - 2 dB
• number of SW volume steps 10
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TECHNICAL MANUAL
Telit GM862-GPS
Quad Band GPS Data Terminal Module
Rev. 0
3.5 Interface connector
The GM862-GPS Transceiver module interface connector (Figure 3) is a low profile
0.50mm (.020") Pitch Receptacle - SMT, Dual Row, Vertical Stacking CSTP 50 pin Molex
52991–0508 (male) with the pin–out shown in the next table.
Pin Signal I/O Function
Internal
Pull up
Type
1 VBATT
2 GND - Ground Power
3 VBATT - Main power supply Power
4 GND - Ground Power
5 VBATT - Main power supply Power
6 A/D - A/D converter @ 12 bit (Input Impedance >100Kohm)
7 VBATT - Main power supply Power
8 CHARGE AI Battery Charger Input (5) Power
9 EAR_HF+ AO Handsfree ear output, phase + Audio
10 EAR_MT- AO Handset earphone signal output, phase - Audio
11 EAR_HF- AO Handsfree ear output, phase - Audio
12 EAR_MT+ AO Handset earphone signal output, phase + Audio
13 MIC_HF- AI Handsfree microphone input; phase -, nominal level 3mVrms Audio
14 MIC_MT+ AI Handset microphone signal input; phase+, nominal level 50mVrms Audio
15 MIC_HF+ AI Handsfree microphone input; phase +, nominal level 3mVrms Audio
16 MIC_MT- AI Handset microphone signal input; phase-, nominal level 50mVrms Audio
17 ON_OFF I
18 AXE I Handsfree switching
19 SIMIO I/O External SIM signal - Data I/O 3V ONLY
20 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V
21 PWRCTL O
22 SIMVCC - External SIM signal – Power (3) 3V ONLY
23 RESET I Reset input
24 SIMRST O External SIM signal – Reset 3V ONLY
25 CAM_CLK I/O Camera Interface (4) CMOS 2.8V
26 SIMCLK O External SIM signal – Clock 3V ONLY
27 SIMIN I/O External SIM signal – Presence (active low)
28 GPO2 / JDR O
29 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V
30 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V
31 GPI1 I General purpose input
GPIO8/CAM_O
32
33 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V
34
N
GPIO9/CAM_RS
T
Main power supply Power
-
Max 1V
input
Input command for switching power ON or OFF (toggle command). The pulse to
be sent to the GM862 must be equal or greater than 1 second.
Module Status ON indication (Signal output for power on/off control of external
devices
General purpose output (Open Collector) / Jammer Detect Report
I/O Configurable general purpose I/O pin / Camera Interface (4) CMOS 2.8V
I/O Configurable general purpose I/O pin / Camera Interface (4) CMOS 2.8V
47KΩ
100KΩ
1KΩ
47KΩ
Pull Up to
VBATT
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
Open
Collector
transistor
base
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Telit GM862-GPS
Quad Band GPS Data Terminal Module
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Pin Signal I/O Function
35 TX_GPS O TX Data NMEA GPS protocol CMOS 2.8V
36 C109/DCD O Output for Data carrier detect signal (DCD) to DTE CMOS 2.8V
37 C104/RXD O Serial data output to DTE CMOS 2.8V
38 GPIO10/ CLK I/O Configurable general purpose I/O pin / TRACE or Python DEBUG (5) CMOS 2.8V
39 STAT_LED O Status indicator led
40
41 RX_GPS I RX Data NMEA GPS protocol CMOS 2.8V
42
43 C108/DTR I Input for Data terminal ready signal (DTR) from DTE (4) CMOS 2.8V
44 GPIO13 / MRST I/O Configurable general purpose I/O pin / TRACE or Python DEBUG (5) CMOS 2.8V
45 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 2.8V
46
47
48 GPIO5 / MTSR I/O Configurable general purpose I/O pin / TRACE or Python DEBUG (5) CMOS 2.8V
49
GPIO11 /
IIC_HW_SDA
GPIO12 /
IIC_HW_SCL
GPIO3 / CAM_
SCL
GPIO4 /
CAM_SDA
GPIO6
/ ALARM I/O
I/O Configurable general purpose I/O pin / IIC HW CMOS 2.8V
I/O Configurable general purpose I/O pin / IIC HW interface CMOS 2.8V
Configurable general purpose I/O pin /
I/O
IIC Camera Interface (4)
Configurable general purpose I/O pin /
I/O
IIC Camera Interface (4)
Configurable general purpose I/O pin /
ALARM
Internal
Pull up
Collector
CMOS 2.8V
CMOS 2.8V
CMOS 2.8V
Type
Open
50
GPIO7
/ BUZZER
Configurable general purpose I/O pin /
I/O
BUZZER
(1) For the exclusive use of the Technical Support Service
(2) An earphone with a 150 ohm impedance can be directly connected to EAR+ and EAR–
(3) On this pin a maximum of 47nF bypass capacitor is allowed.
(4) When activating the Easy camera these pins will not be available for other use
(5) This output requires an external circuit to connect it to a serial port.
Figure 3 Interface connector mechanical view
CMOS 2.8V
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Telit GM862-GPS
Quad Band GPS Data Terminal Module
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3.5.1 Logic level specification
Where not specifically stated, all the interface circuits work at 2.72V CMOS logic levels.
The following table shows the logic level specifications in the Telit GM862-QUAD/QUAD-
PY Transceiver module interface circuits:
LEVEL MIN MAX
Input high level 1.9 V 3.3 V
Input low level -0.2 V 0.5 V
Output high
level@1mA
Output low level
@1mA
2.15 V 2.8 V
0 V 0.2 V
Operating Range - Current Capability
Current Min Max
Current Output Low I
OL
- 1mA
Current Output High IOH - 1mA
Buffered Current Output High I
Buffered Current Output Low I
Buffered Current Input High I
Buffered Current Input Low I
(2) - -
BOH
(2)
BOL
BIH
BIL
(1) - 0.5mA
(1)
2mA 20mA
- 30uA
(1) For GPIO1 pin - base input.
(2) For GPIO2 pin - Open Collector.
3.5.2 Reset signal
RESET is used to reset the Telit GM862-GPS Transceiver module. Whenever this signal is
pulled low, the GM862-GPS is reset and Re-booted.
CONNECTOR PIN I/O SIGNAL FUNCTION
SO301 23 I RESET Module reset and
Reboot
NOTE: do not use this signal to power off the Telit GM862-GPS module.
Use the ON/OFF signal (Pin 17 of SO301) to perform this function.
Signal levels:
SIGNAL MIN MAX
RESET Input high 2.2 V 3.3 V
RESET Input low 0 V 0.2 V
If unused, this signal may be left unconnected.
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Telit GM862-GPS
Quad Band GPS Data Terminal Module
3.6 Mechanical characteristics
3.6.1 Dimensions
The Telit GM862-PCS module overall dimension are:
Length: 43.9 mm
Width: 43.9 mm
Thickness: 6.9 mm
Volume: ≅
13 cm
3
The mechanical layout of Telit GM862-GPS Transceiver module is shown in Figure 4
Rev. 0
6.25
Figure 4 GM862-GPS Transceiver Mechanical layout
3.6.2 Weight
The Telit GM862-GPS module weight is 25gr, (shielding included).
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