Sony Ericsson GT47 Parts list manual

Product Photo/Illustration
GT47/GT48
Technical Description

The information contained in this document is the proprietary information of
Sony Ericsson Mobile Communications International.The contents are confidential
and any disclosure to persons other than the officers, employees, agents or subcontractors
of the owner or licensee of this document, without the prior written consent of
SonyEricsson Mobile Communications International, is strictly prohibited. Further,
no portion of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic or mechanical, including
photocopying and recording, without the prior written consent of Sony Ericsson Mobile
Communications International, the copyright holder.
First edition (June 2003)
Sony Ericsson Mobile Communications International publishes this manual without
making any warranty as to the content contained herein. Further Sony Ericsson Mobile
Communications International reserves the right to make modifications, additions and
deletions to this manual due to typographical errors, inaccurate information, or
improvements to programs and/or equipment at any time and without notice. Such
changes will, nevertheless be incorporated into new editions of this manual.
All rights reserved.
©Sony Ericsson Mobile Communications International, 2003
Publication number: LZT 123 7607 R1B
Printed in UK


LZT 123 7607 R1B
Contents
1. Introduction .............................................................................................................. 4
1.1 Description ........................................................................................... 4
1.2 Highlights ........................................................................................... 4
1.3 Main Features and Services............................................................................... 5
1.4 Service and Support ......................................................................................... 9
1.5 Precautions ........................................................................................... 9
2. Mechanical Description .......................................................................................... 10
2.1 Overview ......................................................................................... 10
2.2 Physical Dimensions...................................................................................... 11
3. Electrical Description ............................................................................................. 12
3.1 Power Supply and Extended I/O Connector ................................................... 12
3.2 RS232 Serial and Extended I/O Interface ....................................................... 16
3.3 Audio Connector ......................................................................................... 22
3.4 Antenna Connector........................................................................................ 24
3.5 SIM Card Reader ......................................................................................... 25
3.6 Real Time Clock ......................................................................................... 25
3.7 Software Updates ......................................................................................... 26
4. Embedded Applications ......................................................................................... 27
4.1 Features ......................................................................................... 27
4.2 Implementation ......................................................................................... 27
5. TCP/IP Stack........................................................................................................... 29
5.1 Implementation ......................................................................................... 29
6. Operation................................................................................................................. 30
6.1 Switching the GT47 On ................................................................................ 30
6.2 Switching the GT47 Off................................................................................ 30
6.3 Operating States/LED.................................................................................... 30
6.4 Power Save ......................................................................................... 31
6.5 Controller Mode ......................................................................................... 31
7. Technical Data ........................................................................................................ 32
8. AT Command Summary......................................................................................... 36
9. Abbreviations and Definitions............................................................................... 42

1. INTRODUCTION
4
LZT 123 7607 R1B
1. Introduction
1.1 Description
The GT47/GT48 is an intelligent GSM/GPRS control terminal that
encapsulates everything you need for wireless M2M capability in one
compact unit. In conjunction with Sony Ericsson’s M2mpower package the
GT47/48 can host and control your wireless application, minimising the
need for extra components. Alternatively, it can be used as a powerful
standalone GPRS modem with its intrinsic TCP/IP stack.
The GT47/48 is a self contained terminal with its own SIM card reader and
standard connector interface, minimising the need for further hardware
development.Its wide and useful range of IOs can be reconfigured to add
functions and features that make your M2M solution both innovative and
cost effective.
The GT47/GT48 can be used to provide a communications link for a
variety of wireless applications including fleet and asset management,
vending, security and alarm monitoring, e-maintenance and other
telemetry applications. The ease of application development and hosting
on the GT47/48 means M2M solutions in area of personal leisure (e.g.boats
and caravans) and around the home can be addressed.
With dual band 900/1800 MHz (GT47) and 850/1900 MHz (GT48)
versions available, your applications can be used all over the world.
The control terminal comes with a library of sample script applications to
give developers a head start where needed.
The GT47/GT48 incorporates Sony Ericsson's GR47/GR48 GSM/GPRS
engine.
Note! When the GT47 is referred to in the text the description covers the GT48
as well; unless specifically mentioned.
All functions described inside this Technical Description are only possible
when the SIM-Card is inserted.
1.2 Highlights
• Intelligent, versatile GSM/GPRS control terminal
• Dual band, EGSM 900/1800MHz
• Customised applications can be embedded and run independently
• Self contained terminal with standard connectors
• 2 x RS232 interfaces with a useful range of configurable IOs
• TCP/IP stack
• Data: GPRS, HSCSD, CSD, SMS
• Voice: full rate, enhanced full rate, half rate

1. INTRODUCTION
5
LZT 123 7607 R1B
• SMS: mobile-originated, mobile-terminated, cell broadcast
• Fax: Group 3, Classes 1 & 2
• 15 way high density connector
•5V - 32V d.c. input
• 4-wire audio connection
• Antenna connection (FME male)
• R&TTE type approved (GT47)
1.3 Main Features and Services
The GT47 performs a set of telecom services (TS) according to GSM
standard phase 2+, ETSI and ITU-T. The services and functions of the
GT47 are implemented by issuing customised applications embedded on
the device, or by AT commands issued internally, or over the RS232 serial
interface.
1.3.1 Types of Mobile Station
The GT47 is a dual band control terminal with the GSM radio
characteristics shown in the table below.
GT47 E-GSM900 GSM1800
Frequency Range (MHz) TX: 880-915
RX: 925-960 TX: 1710-1785 RX: 1805-1880
Channel spacing 200kHz 200kHz
Number of channels 174 carriers *8 time slots
E-GSM: channels 0 to 124
channels 975 to 1023
374 carriers *8 time slots
DCS: channels 512 to 885
Modulation GMSK GMSK
TX phase accuracy < 5º RMS phase error (burst) < 5º RMS phase error (burst)
Duplex spacing 45MHz 95MHz
Receiver sensitivity at
antenna connector < –102dBm < –102dBm
Transmitter output power at
antenna connector Class 4 2W (33dBm) Class 1 1W (30dBm)
Automatic hand-over between EGSM900 and GSM1800

1. INTRODUCTION
6
LZT 123 7607 R1B
1.3.2 Short Message Service
The GT47 supports the following SMS services:
• Sending; MO (mobile-originated) with both PDU (protocol data unit)
and text mode supported.
• Receiving; MT (mobile-terminated) with both PDU and text mode
supported.
• CBM (cell broadcast message); a service in which a message is sent to all
subscribers located in one or more specific cells in the GSM network
(for example, traffic reports). This feature is network dependent.
• SMS STATUS REPORT according to GSM 03.40.
• SMS COMMAND according to GSM 03.40.
The maximum length of an SMS message is 160 characters when using 7-
bit encoding. For 8-bit data, the maximum length is 140 characters. The
GT47 supports up to 6 concatenated messages to extend this function.
1.3.3 Voice Services
The GT47 offers the capability of mobile originated and mobile
terminated voice calls, as well as supporting emergency calls. Multi-party,
call waiting and call divert features are available. Some of these features are
network-operator specific.
For the inter-connection of audio, the GT47 offers a balanced 4-wire
analogue interface.
DTMF (Dual Tone Multi Frequency) is supported.
The GT48 also supports the Adaptive Multi Rate (AMR) type of vocoder.
GT48 GSM850 GSM1900
Frequency Range (MHz) TX: 824-849
RX: 869-894 TX: 1850-1910 RX: 1930-1990
Channel spacing 200kHz 200kHz
Number of channels 124 carriers *8 time slots
GSM: channels 128 to 251 299 carriers *8 time slots PCS: channels 512 to 810
Modulation GMSK GMSK
TX Phase Accuracy < 5º RMS phase error (burst) < 5º RMS phase error (burst)
Duplex spacing 45MHz 80MHz
Receiver sensitivity at
antenna connector < –102dBm < –102dBm
Transmitter output power
at antenna connector Class 4 2W (33dBm) Class 1 1W (30dBm)
Automatic hand-over between GSM850 and GSM1900

1. INTRODUCTION
7
LZT 123 7607 R1B
1.3.4 Data Services
The GT47 supports the following data protocols:
•*356*HQHUDO3DFNHW5DGLR6HUYLFH
GT47 is a Class B terminals, which provide simultaneous activation
and attachment of GPRS and GSM services. GT47 is a GPRS class 8
(4+1) enabled devices, which are capable of transmitting in one
timeslot per frame (up link), and receiving at a maximum of four
timeslots per frame (down link).
•&6'&LUFXLW6ZLWFKHG'DWD
GT47 is a capable of establishing a CSD communication at 9.6kbps.
•+6&6'+LJK6SHHG&LUFXLW6ZLWFKHG'DWD
GT47 supports HSCSD class 2 (2+1) communication, with one
timeslot per frame capacity in the up link and two timeslots per frame
capacity in the down link.
1.3.5 Fax Services
The GT47 allows fax transmissions to be sent and received by commercial
fax software installed on the application computer. Group 3 fax Classes 1
and 2 are supported.
1.3.6 Supplementary Services
• Call forwarding
• Call hold, waiting and multiparty
• Calling/called number identification
• Advice of charge
•USSD
• Alternate line service
• Customer service profile
• Preferred networks
• Operator selection
• Network registration
• Call barring
• Call transfer
1.3.7 Serial Communication
The GT47 enables an end-to-end communication path to be established
between the telemetry/telematics application, either hosted internal or
connected externally, and a remote terminal or host, via the GSM network.

1. INTRODUCTION
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LZT 123 7607 R1B
Once a path has been set up, voice or data communication can take place.
An RS232 9-signal serial interface is available via the GT47’s 15-way high
density data connector.
This primary serial interface can be used to:
1. Control the GT47 via an external PC or micro-controller using AT
commands;
2. Send and receive data.
The GT47 supports the full set of AT commands according to GSM 07.05
and GSM 07.07. It also supports an extended set of Ericsson proprietary AT
commands to add extra functionality.
AT commands are used to operate the GT47 with a broad range of
functions including:
• configuring general parameters of the GT47
• setting up and controlling communications to and from the GSM
network
• obtaining GSM network status information
Additionally the GT47 provides a second RS232 serial interface, operating
as a 4-signal and GND interface, with hardware flow control (Rx, Tx, CTS
and RTS). This 4-signal serial interface is controllable via embedded
applications and may be used to control external accessories e.g. a GPS
receiver.
For more detail on the AT commands supported by the GT47 see “AT
Command Summary”, page 36.
1.3.8 Extended I/O Interface
The control terminal contains several general purpose, configurable, input
and output signals. Signals may be reconfigured by AT command or by
intrinsic function when using embedded applications.
• 1 analogue input
• 3 digital inputs
• 5 digital outputs
• + 4.8V DC output
In addition, 6 of the control signals on the primary RS232 interface can be
reconfigured for use as digital inputs or outputs if required.
The drivers controlling certain outputs have been designed to carry higher
currents than normal logic IOs. They can be used to activate or power
external devices, for example a switch or a relay.
A+4.8V output is available, if required, to power external devices.

1. INTRODUCTION
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LZT 123 7607 R1B
1.3.9 Interfacing with the GT47
The GT47 uses the following industry standard connectors;
• 15 pin high density socket (RS232 serial port and extended I/O
interface)
• RJ12 (plug-in power supply and extended I/O connector)
• RJ9 (handset audio connector)
• Integral SIM card reader
• FME male (antenna connector)
1.4 Service and Support
To contact customer support please use the details below:
Customer Support
Sony Ericsson Mobile Communications
Maplewood Building
Chineham Business Park
Basingstoke
RG24 8YB
E-mail: [email protected]m
or
[email protected]
Information about Sony Ericsson and its products is available on the
following web site:
http://www.SonyEricsson.com/M2M
1.5 Precautions
The GT47 as a standalone item is designed for indoor use only. To use
outdoors it must be integrated into a weatherproof enclosure. Do not
exceed the environmental and electrical limits as specified in “Technical
Data”, page 32.

2. MECHANICAL DESCRIPTION
10
LZT 123 7607 R1B
2. Mechanical Description
2.1 Overview
The pictures below show the mechanical design of the module along with
the positions of the different connectors and mounting holes. The module
case is made of durable PC/ABS plastic.
Figure 2.1 Module viewed from the left side
Figure 2.2 Module viewed from the right side
A
ntenna
connector
RS232 serial and
extended I/O connector
LED
Access to
SIM card
Mounting hole (x2)
Audio
connector
Power supply and
extended I/O connecto
r

2. MECHANICAL DESCRIPTION
11
LZT 123 7607 R1B
2.2 Physical Dimensions
Measurements are given in millimetres. See also “Technical Data”, page 32.
71.5
66.4
77.4
26.2
11.0
55.3
45.3
10.6
11.0
9.0
51.0
(x2)
3.5

3. ELECTRICAL DESCRIPTION
12
LZT 123 7607 R1B
3. Electrical Description
All electrical connections to the module are protected in compliance with
the standard air (8kV) and contact (4kV) Electrostatic Discharge (ESD)
tests, of EN 61000-4-2.
The module uses the following industry standard connectors:
• High density 15 pin (RS232 serial and extended I/O interface)
• RJ12 6-way (power supply and extended I/O connector)
• RJ9 4-way (handset connector)
• SIM card reader
• FME male coaxial jack (antenna connector)
3.1 Power Supply and Extended I/O Connector
An RJ12 6-way connector, as shown and described below, serves as a means
of supplying and controlling d.c. power to the modem. Additionally there
are several extended input/output signals available that can be used to
control or interface external systems and devices.
General signal description:
1 VIN
2 OUT-2
3 IN-1
4 TO_IN
5 OUT-1
6 GND

3. ELECTRICAL DESCRIPTION
13
LZT 123 7607 R1B
The power connector electrical characteristics are listed below:
Note! Signal OUT-2 on the RJ12 connector is switched in parallel to signal
OUT-4 on the 15-pin high density socket. The individual output signals
are generated by two different low side switches inside the module driven
from a common control signal.
3.1.1 Power Supply Interface
The supply voltage VIN, required by the GT47, is in the range 5V - 32V
d.c. VIN and GND are reverse polarity and over voltage protected.
The GT47 switches on automatically once the 5V-32V dc supply voltage
is applied.
Note! The GT47 will not switch on if TO_IN is shorted to ground when the dc
supply is applied.
Note! For more information on switching the GT47 on and off please see section
“6. Operation”, page 30.
Note! Please be aware that the total current carried via either the VIN or GND
pins will be the sum of the intrinsic power consumption of the GT47 and
any drive current supplied via OUT-1 or OUT-2 (or other IOs). The
current on either of the VIN or GND pins must not exceed 1.5A.
Caution! It is recommended that the system integrator provides appropriate fusing
otherwise the GT47 may be damaged.
Pin Signal Dir Limits Description
1 VIN I5 - 32V Positive power input
2OUT-2 O32V, 0.25A Low side switch, short circuit protected
3IN-1 I–0.5 - 32V Digital Input
VIH > 3V, VIL < 2.8V
Internal Pull Down of 40KΩ
4TO_IN I–0.5 - 32V Active low control line used to switch
the GT47 off/on.
VIH > 5V, VIL < 2V
Power off/on: t > 0.2s
Internal Pull Up to VIN of 20KΩ
5OUT-1 O VIN, 0.4A High side switch, short circuit protected
6GND I - Negative power (ground) input and
return path for TO_IN and the extended
inputs and outputs

3. ELECTRICAL DESCRIPTION
14
LZT 123 7607 R1B
Current Consumption at Standard Operation
Notes! Power Down Mode: DC power is applied but the GT47 is switched OFF.
Standby Mode: The module is switched ON and camped on to the
network. No call in progress.
Talk Mode: The module is switched ON and a voice/data call is in
progress.
The power consumption during transmission in Talk Mode is measured at
maximum transmitted power.
The power consumption in Standby Mode is measured at the maximum
paging rate (Paging Rate 2).
Current Consumption with external +4.8V Supply Active
For the following calculations it was assumed that the external +4.8V load
is 70mA.
Note! These tables do not include the power consumption associated with any
drive current supplied via further GT47 outputs, e.g. OUT-1 or OUT-2.
Supply Voltage 5V 12V 32V
Power Down Mode:
AV Max AV Max AV Max
515 515 20 50 mA
Standby Mode (typical):
Frequency AV Max AV Max AV Max
850/900 MHz 26 110 943 620 mA
1900/1800 MHz 26 120 945 619 mA
Talk Mode (typical):
Frequency AV Max AV Max AV Max
850/900 MHz 220 1230 90 520 40 200 mA
1900/1800 MHz 170 960 70 350 30 140 mA
Supply Voltage 5V 12V 32V
Power Down Mode:
AV Max AV Max AV Max
515 515 20 50 mA
Standby Mode (typical):
Frequency AV Max AV Max AV Max
850/900 MHz 112 196 45 79 19 33 mA
1900/1800 MHz 112 206 45 81 19 32 mA
Talk Mode (typical):
Frequency AV Max AV Max AV Max
850/900 MHz 306 1316 126 556 53 213 mA
1900/1800 MHz 256 1046 106 386 43 153 mA

3. ELECTRICAL DESCRIPTION
15
LZT 123 7607 R1B
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Digital Inputs
The digital input IN-1 is available on pin 3 of the RJ12 connector. Its state
is detected by IO5 of the embedded GR47 engine, see GT47-GR47 signal
cross reference table, page 21.
The distinction between low level and high level signals is at the voltage
level of 3 V. Voltages above 3 V are detected as high level voltages and
voltages below 2.8 V are detected as low level.
Digital Outputs
The RJ12 power supply connector has two different output drivers:
• OUT-1 is driven by a high side switch that applies VIN to pin 5 of the
RJ12 connector. IO1 of the embedded GR47 engine is used to activate
the OUT-1 signal, see GT47-GR47 signal cross reference table,
page 21.
• OUT-2 is driven by a low side switch that shorts pin 2 of the RJ12
connector to ground when activated. IO3 of the embedded GR47
engine is used to activate OUT-2, see GT47-GR47 signal cross
reference table, page 21.
VIN Monitoring
The voltage, VIN, can be monitored internally by the GT47, for example if
the control terminal is supplied from an external battery. ADC1 on the
GR47 is used for this purpose, see GT47-GR47 signal cross reference table,
and is calibrated to operate in the voltage range 0 – 31.875 V. The
resolution of the 8 bit converter, ADC1, provides a measurement accuracy
of approximately 3%.

3. ELECTRICAL DESCRIPTION
16
LZT 123 7607 R1B
3.2 RS232 Serial and Extended I/O Interface
The GT47 supports a standard 9 signal RS232 serial interface (EIA/TIA
574) on the 15 pin high density connector together with a range of
configurabe I/Os including a second 4-wire RS232 interface.
Signals that support an alternative configuration can be reconfigured using
the appropriate AT command (e.g. AT+E2IO) or via an intrinsic function
if using an embedded application.
Note! When reconfiguring a GT47 signal, via AT command or intrinsic
function, the corresponding GR47 signal name must be used, see GT47-
GR47 signal cross reference table, page 21.
The electrical characteristics of the serial port signals are shown below:
1 DCD
2 RD
3 TD
4 IN-3
5 OUT-3
6 DSR
7 RTS
8 CTS
9 4.8V
123
67813 14
10
10 RI
11 IN-2
12 OUT-4
13 DTR
14 GND
15 ANA_IN
45
9
11 12 15
Pin GT47
Signal
Dir Max.
Voltage
limits
Description
1DCD O±13.2V RS232 signal
Data carrier detect V
RXW
≥±5V
2RD O±13.2V RS232 signal:
Received data V
RXW
≥±5V
3TD I± 25V RS232 signal:
Transmitted data V
,/
< 0.6V, V
,+
> 2.4V
4IN-3 I-0.5 - 32V Digital input V
,+
> 3V, V
,/
< 2.8V
PullDown with 40KΩ
5OUT-3 O32V, 0.25A low side switch, short circuit protected
6DSR O±13.2V RS232 signal:
Data set ready V
RXW
≥±5V
7RTS I±25V RS232 signal:
Request to send V
,/
< 0.6V, V
,+
> 2.4V
8CTS O±13.2V RS232 signal:
Clear to send V
RXW
≥±5V

3. ELECTRICAL DESCRIPTION
17
LZT 123 7607 R1B
3.2.1 Standard RS232 Serial interface and Signals
The module supports a standard RS232 serial interface (EIA/TIA 574) via
its 15 pin high density connector, shown above.
3.2.2 Serial Data
The GT47 supports the standard data character format of 1 start bit, 8 bit
data, no parity plus 1 stop bit, in total 10 bits per character. In line with
serial communication terminology the module is the data circuit-
terminating equipment (DCE) and the external application or computer is
the data terminating equipment (DTE).
3.2.3 Serial Data Signals - RD, TD
The default baud rate is 9.6kbps, however higher bit rates up to 230.4kbps
are supported and can be set by AT commands. At start-up the module
transmits and receives data at the default rate of 9.6kbps in either standard
AT mode or binary mode (the first received data - AT or binary format -
determines the operating mode).
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RD is an output signal that the GT47 uses to send data to the external
application.
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TD is an input signal, used by the external application to send data to the
GT47.
94.8V O0 - +4.8V,
75mA Voltage supply for external devices Supply voltage +4.8V, max. current 75mA
10 RI O±13.2V RS232 signal:
Ring indicator V
RXW
≥±5V
11 IN-2 I-0.5 - 32V Digital input V
,+
> 3V, V
,/
< 2.8V
PullDown with 40KΩ
12 OUT-4 O32V, 0.25A low side switch, short circuit protected
13 DTR I±25V RS232 signal:
Data Terminal Ready V
,/
< 0.6V, V
,+
> 2.4V
14 GND I - Ground connection and return path for
the extended inputs/outputs
15 ANA_IN I-0.5 - 32V Analog input measurement range: 0 -
12.75V
Pin GT47
Signal
Dir Max.
Voltage
limits
Description

3. ELECTRICAL DESCRIPTION
18
LZT 123 7607 R1B
3.2.4 Control Signals - RTS, CTS, DTR, DSR, DCD, RI
RTS and CTS are capable of transmitting at 1/10th of the data
transmission speed for data rates up to 230.4kbps (byte-oriented flow
control mechanism).
5HTXHVWWR6HQG576 3LQ
Used to condition the GT47 for data transmission. The default level is
inactive by internal pull down.
The exact behaviour of RTS is defined by an AT command. Software or
hardware control can be selected. Hardware flow is the default control.
The application must pull RTS high to enable transmission from the
GT47.
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CTS indicates that the GT47 is ready to transmit data. The default level is
high. You can define the exact behaviour of CTS through an AT command,
and can select software or hardware flow control.
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DTR indicates that the DTE is ready to send and receive data. It also acts
as a hardware ‘hang-up’, terminating calls when switched low. The signal
is active high. You can define the exact behaviour of DTR with an AT
command.
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An active DSR signal is sent from the GT47 to the application (DTE) to
confirm that a communications path has been established. DSR has two
modes of operation, use the AT command AT&S to set the mode.
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DCD indicates that the GT47 is receiving a valid carrier (data signal) when
high. You can define the exact behaviour of DCD with an AT command.
5LQJ,QGLFDWRU5, 3LQ
RI indicates that a ringing signal is being received by the GT47 when
high. You can define the exact behaviour or RI with an AT command.

3. ELECTRICAL DESCRIPTION
19
LZT 123 7607 R1B
Alternative Configuration
It is possible to reconfigure one or more of the signals in this section (RTS,
CTS, DTR, DSR DCD and RI) to be used as digital inputs or outputs if the
full RS232 serial interface is not required. Configuration is achieved using
AT command (AT+E2IO) or via embedded application intrinsic functions,
please refer to GT47-GR47 signal cross reference table, page 21.
To be reconfigured as a digital IO, each signal must retain the direction and
the logic voltage levels attributed to it when used as an RS232 signal. For
example DSR can only be reconfigured as a digital output with V
RXW
≥±5V.
3.2.5 Extended I/O Signals
Please refer to GT47-GR47 signal cross reference table, page 21, for more
information on the relationship between signal names and pin numbers of
the GT47 and the embedded GR47 engine.
'LJLWDO,QSXWV 3LQ
Digital inputs IN-2 and IN-3 are available on the HD15 connector via pins
11 and 4 respectively. The inputs are detected via signals IO4 and IO7 of
the embedded GR47 engine.
Note! As an alternative configuration signals IN-2 and IN-3 can be used to
support a second RS232 serial interface as RTS-2 and TD-2. Further
information is given below.
$QDORJ,QSXW 3LQ
The signal ANA_IN can be used for measuring analog input values in the
range 0 -12.75V. ADC2 of the embedded GR47 is used to detect
ANA_IN.
The resolution of the converter is 8 bit with an measurement accuracy of
about 3%.
The input impedance of the ANA_IN pin is 50 KΩ.
'LJLWDO2XWSXWV 3LQ
Digital outputs OUT-3 and OUT-4 are available on the HD15 connector
via pins 5 and 12 respectively. The outputs are controlled via signals IO8
and IO3 of the embedded GR47 engine.
Signal OUT-4 on the HD15 connector is switched in parallel to signal
OUT-2 on the RJ12 connector. The individual output signals are
generated by two different low side switches inside the terminal driven
from the common control signal, IO3. All GT47 output signals driven by

3. ELECTRICAL DESCRIPTION
20
LZT 123 7607 R1B
low side switches return to open circuit when deactivated. This allows the
external application hardware to determine the desired logic voltage levels
with the appropriate pull-up.
The output drivers are low side switches which short the pin to GND if
they are activated.
Note! As an alternative configuration signals OUT-3 and OUT-4 can be used to
support a second RS232 serial interface as CTS-2 and RD-2. Further
information is given below.
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There is a voltage regulator implemented inside the module that is capable
of supplying an external voltage source of +4.8V with a maximum current
of 75 mA.
The voltage source can be switched on/off with the DAC signal of the
internal GR47 GSM engine.
By default the voltage source is switched on. A high level of 2.75V at the
DAC output of the GR47 GSM engine will switch the voltage source off.
Note! The +4.8V source may be switched on/off via an embedded or external
application and so may be used as an optional digital output with levels of
+4.8V and open circuit.
3.2.6 Second RS232 Serial Interface
IN-3 and OUT-3 can be automatically reconfigured as signals TD-2 and
RD-2, of a second serial interface, by enabling UART3 of the internal
GR47. UART 3 may be enabled using AT command or intrinsic function.
In addition, IN-2 and OUT-4 can be automatically reconfigured as signals
CTS-2 and RTS-2 of the second serial interface by enabling hardware flow
control for UART3 on the internal GR47. Hardware flow control can be
enabled using intrinsic function only.
Note! The signal level thresholds for each of the digital inputs of the second serial
interface are: 3V<V
,+
<32V and V
,/
< 2.8V.
An external RS232 transceiver component may be used to convert the serial
interface to standard RS232 electrical levels. The GT47’s +4.8 V output
can be used to provide power for the transceiver.
3.2.7 Relationship between GT47 and GR47 signals
When reconfiguring a GT47 signal, via AT command or intrinsic
function, the corresponding GR47 signal name must be used, see the
GT47-GR47 signal cross reference tables overleaf.