Maestro 100 User manual

Maestro 100 Series
GSM/GPRS Modems
Eco –Lite –100M –Extended
USER MANUAL
Rev. 01

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REVISION HISTORY
Rev.
Date
Details
Originated by
00
01
Mar 2007
First release
Wallace Lee
01
30
Jan 2008
Second release
Cecile Lin
This manual is written without any warranty.
Maestro Wireless Solution Ltd. reserves the right to modify or improve the product
and its accessories which can also be withdrawn without prior notice.
Besides, our company stresses the fact that the performance of the product as well
as accessories depends not only on the proper conditions of use, but also on the
environment around the places of use.
Maestro Wireless Solution Ltd. assumes no liability for damage incurred directly or
indirectly from errors, omissions or discrepancies between the modem and the
manual.
Confidential, the whole present document is the sole property of Maestro
Wireless Solution Limited.
1

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TABLE OF CONTENTS
REVISION HISTORY.................................................................................................1
SAFETY PRECAUTIONS ......................................................................................... 3
Using the modem in vehicle............................................................................3
Protecting your modem....................................................................................3
CHAPTER 1: Introduction.....................................................................................4
1. Package.........................................................................................................4
2. Interfaces ....................................................................................................4
a. Status indicator ...............................................................................4
b. SMA female antenna connector .................................................4
c. 15-Pin D-Sub Female connector (RS232/Audio) .................5
d. 4-Pin connector (Power input/output) .....................................5
3. Optional accessories ................................................................................. 6
CHAPTER 2: INSTALLATION................................................................................8
1. Mounting the modem................................................................................8
2. Install the SIM card................................................................................... 8
3. Connect the external antenna (SMA type) ......................................8
4. Connect the modem to external device............................................9
5. Connect the DC power supply .............................................................9
CHAPTER 3: WORKING WITH MAESTRO 100..............................................10
1. Checking the modem (using Microsoft Windows XP
HyperTerminal as example)......................................................................10
2. Basic operation.........................................................................................12
CHAPTER 4: SPECIFICATIONS .........................................................................13
CHAPTER 5: APPENDIX.......................................................................................14
1. Factory settings........................................................................................14
2. Input/Output port....................................................................................14
3. RS232 Auto-online mode (power saving) ......................................14
CHAPTER 6: TROUBLESHOOTING...................................................................15
1. The modem’s LED does not light......................................................15
2. The modem’s LED lights but does not blink long time after
power up ..........................................................................................................15
3. The modem does not respond to the terminal program ...........15
4. No voice could be heard for the modem’s speaker output when
a call is answered.........................................................................................15
Confidential, the whole present document is the sole property of Maestro
Wireless Solution Limited.
2

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SAFETY PRECAUTIONS
The modem generates radio frequency (RF) power. When using the modem care
must be taken on safety issues related to RF interference as well as regulations
of RF equipment. 

Do not use your phone in aircraft, hospitals, petrol stations or in places where
using GSM products is prohibited. 

Be sure that the modem will not be interfering with nearby equipment. For
example: pacemakers or medical equipment. The antenna of the modem should
be away from computers, office equipment, home appliance, etc. 

An external antenna must be connected to the modem for proper operation. Only
used approved antennas with the modem. Please contact authorized dealer on
finding an approved antenna. 

Always keep the antenna with minimum safety distance of 26.6 cm or more from
human body. Do not put the antenna inside metallic box, containers, etc. 
Using the modem in vehicle
Check for any regulation or law authorizing the use of GSM in vehicle in your
country before installing the modem 

Install the modem by qualified personnel. Consult your vehicle dealer for any
possible interference of electronic parts by the modem. 

The modem should be connected to the vehicle’s supply system by using a fuse-
protected terminal in the vehicle’s fuse box 

Be careful when the modem is powered by the vehicle’s main battery. The
battery may be drained after extended period. 
Protecting your modem
To ensure error-free usage, please install and operate your modem with care.
Do remember the following: 

Do not expose the modem to extreme conditions such as high humidity/rain, high
temperatures, direct sunlight, caustic/harsh chemicals, dust, or water. 

Do not try to disassemble or modify the modem. There is no user serviceable
part inside and the warranty would be void. 

Do not drop, hit or shake the modem. Do not use the modem under extreme
vibrating condition. 

Do not pull the antenna or power supply cable. Attach/ detach by holding the
connector. 

•Connect the modem only according to the instruction manual. Failure to do it will

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CHAPTER 1: Introduction
Maestro 100 is a ready-to-use GSM modem for voice, data, fax and SMS
services. It also supports GPRS Class 10 for hi-speed data transfer (except Maestro
100 Eco). Maestro 100 can be easily controlled by using AT command for all kinds of
operations. With standard 9-pin RS232 port and telephone-like audio plug (via
optional cable) the Maestro 100 can be set up with minimal effort.
1. Package
The Maestro 100 package should include the following:
- Maestro 100/Ext/Eco/Lite x 1
- Power cord with fuse x 1
- Safety note x 1
2. Interfaces
SIM holder eject button
SMA female antenna
Status indicator
15 pin Sub-D Female Connector
connector
(RS232/Audio)
SIM holder 4-PIN connector
(Power input/output)
a. Status indicator
The LED will indicate different status of the modem:

OFF
Modem is switched off

ON
Modem is connecting to the network
Flashing slowly Modem is in idle mode 

Flashing rapidly Modem is in transmission/communication (GSM only) 
b. SMA female antenna connector
Connect this to an external antenna with SMA male connector. Make sure the
antenna is for the correct GSM frequency with impedance of 50ohm, and also

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c. 15-Pin D-Sub Female connector (RS232/Audio)
The connector provides serial link and audio link to the modem
Pin number
Name
EIA designation
Type
Note
1
DCD
Data Carrier Detect
Output
2
TX
Transmit Data
Input
3
BOOT
Input
Not used
4
MICROPHONE (+)
Input
With 2VDC bias
5
MICROPHONE (-)
Input
output
6
RX
Receive Data
Output
7
DSR
Data Set Ready
Output
8
DTR
Data Terminal Ready
Input
9
GND
Ground
Ground
10
SPEAKER (+)
Output
11
CTS
Clear To Send
Output
12
RTS
Request To Send
Input
13
RI
Ring Indicator
Output
14
RESET
Input
Pull low to reset
15
SPEAKER (-)
Output
Specification of microphone and speaker to be connected:
Parameters
Min
Typical
Max
Remark
Microphone current @2V/2K Ohm
0.5mA
Microphone input level
100 mVpp
Speaker output current 150 Ohm/1nF
16mA
Speaker impedance
32ohm
50Ohm
Please refer to the document "Application notes - Power supply & Audio" for more
information about audio connection.
d. 4-Pin connector (Power input/output)
A cable, included in the package shall be used for power supply connection:
Pin assignment of 4-Pin connector
Pin number
Name
Functions
1
I/O
Input/Output port
2
~INTR
Interrupt function triggered by pulling this
pin to ground or LOW level; reserved for
additional functions with new firmware
3
POWER -
DC power negative input
4
POWER +
DC power positive input

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A cable, included in the package shall be used for power supply connection:
5-32V DC
Supply
Connector Micro-Fit 3.0
Fuse holder
Stripped wire
Fuse rating:
250V –2.5A
3. Optional accessories
You may contact your sales agent for the following optional accessories:
External antenna
-Magnetic mount type
-Frequency GSM 900/1800 band
-Gain 3db
-VSWR < 1.5:1
-Height ~ 236 mm (including magnetic base)
-Cable: Type RG-174U length 2.5m
‘Y’ cable
-Direct connection with standard 9-
pin RS-232 port (DTE)
-Direct connection with common
handset of telephone for voice call
-Shielded cable
-Cable length 1.1m (w/connector)
Sub-D 9 pin
4p4c plug

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Pin assignment
Sub-D 15 (male)
Sub-D 9 (female)
Plug 4P4C
1
1
2
3
3
4
1
5
4
6
2
7
6
8
4
9
5
10
2
11
8
12
7
13
9
14
15
3
DIN rail mount
Quick attachment / detachment
to standard DIN rail 

Zinc plated Steel 

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CHAPTER 2: INSTALLATION
1. Mounting the modem
Use 2 pieces of M3 screw to mount the modem. When using optional DIN rail mount,
please refer to document "Installation of DIN rail mount".
Screw mounting slot
Bottom view
2. Install the SIM card
Use a ball pen or paper clip to press the SIM holder eject button. The SIM holder will
come out a little. Then take out the SIM holder.
Note: DO NOT pull out the SIM holder without pushing the ejector button.
Put the SIM card to the tray; make sure it has completely sat on the tray. Put the tray
back into the slot.
3. Connect the external antenna (SMA type)
Connect this to an external antenna with SMA male connector. Make sure the
antenna is for the GSM frequency with impedance of 50ohm, and also connector is
secured tightly.
Note: Please use antenna designed for GSM device operation. Incorrect antenna will
affect communication and even damage the modem.
SMA male connector
of antenna cable
Secure tightly

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4. Connect the modem to external device
You can use the optional 'Y' cable to connect the modem's Sub-D connector to
external controller/computer. Note: The modem CANNOT be directly connected to
the 'LINE' jack of a landline telephone.
Connection example using optional 'Y' cable:
4p4c
plug
Handset of phone
Maestro
Sub-D 15 pin
DB-9
connector
connector
100
RS-232 port of PC
5. Connect the DC power supply
Connect the open ending of the inducted power cord to a DC supply. Refer to the
following for power supply requirement.
Input voltage range
5V –32V
Rated current
650 mA
AC-DC Adaptor
or battery (Not
included)
Solder wire
endings
Connect the connector to the modem. The modem will turn on automatically.
The status indicator on the modem will be lit when power on. After a few seconds it
will go flashing slowly (registered to the network successfully refer 1.2.1).