Erco&Gener GenPro 18e User manual

L’esprit Modem
User Guide
GenPro 18e
(GenPro18e)
Reference : EG_GenPro18e_1003_UG_007_UK
Revision : 007
Date : 10/10/2011
S.A. ERCO & GENER – ZI de St. Lambert-des-Levées – BP 30163 – F-49412 SAUMUR Cedex
Tél. : [phone] – Fax : [phone] – www.ercogener.com – [e-mail]
SA CAPITAL 200873 €– R.C. SAUMUR B 332 174 820 – SIRET 332 174 820 00032 – NAF 2630Z – TVA Intra : FR 16 332 174 820

EG_GenPro78e_1003_UG_007_UK Page 2 / 41
Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
Document history
Révision Modifications Auteur Date
000 CREATION F. LE BRETON 27/05/08
001 Added Reset following SIM extraction (paragraph 5.1.4) F. LE BRETON 27/05/08
002
Modified product package sticker page 09 et 11
Update consumptions page 35
Update declaration of conformity page 41
F. LE BRETON 30/05/08
003 Added consumptions page 34
Modified temperature range page 37 F. LE BRETON 10/06/08
004 Cancelation Error Code table page 25 F. LE BRETON 30/10/08
005 Modified "CPIN" page 16 F. LE BRETON 30/10/09
006 Updating the certificate of conformity. YST 10/05/11
007 The GenPro 20e SQB becomes the GenPro 18e. YST 10/10/11
The main modifications in this document compared to its previous version, are easily identifiable on a
monitor by means of the blue text.

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
CONTENTS
PRESENTATION................................................................................................................................................5
WARNING ..........................................................................................................................................................6
COPYRIGHT AND DISCLAIMER.......................................................................................................................6
1 REFERENCES ................................................................................................................................................7
1.1 REFERENCE DOCUMENTS............................................................................................................................... 7
1.2 ABREVIATIONS ............................................................................................................................................... 7
2 PACKING.........................................................................................................................................................9
2.1 CONTENTS..................................................................................................................................................... 9
2.2 PACKING CASE .............................................................................................................................................. 9
2.3 MODEM LABELS ........................................................................................................................................... 10
3 GENERAL PRESENTATION ........................................................................................................................11
3.1 PHYSICAL DESCRIPTION ............................................................................................................................... 11
3.2 EXTERNAL CONNECTIONS ............................................................................................................................. 12
3.2.1 Connections ................................................................................................................................... 12
3.2.1.1 GSM antenna connector......................................................................................................... 12
3.2.1.2 4-pin Micro FIT female connector........................................................................................... 12
3.2.1.3 15-pin Sub HD female connector ........................................................................................... 12
3.2.2 2-wire micro FIT supply cable....................................................................................................... 13
4 CHARACTERISTICS AND SERVICES.........................................................................................................14
5 USING THE MODEM ....................................................................................................................................15
5.1 STARTING WITH THE MODEM ......................................................................................................................... 15
5.1.1 Mounting the modem ..................................................................................................................... 15
5.1.2 Installation of the modem............................................................................................................... 15
5.1.3 Communication with the modem ................................................................................................... 16
5.1.4 Extraction of the SIM card.............................................................................................................. 16
5.1.5 Re-initialisation of the modem ....................................................................................................... 17
5.2 RECOMMENDATIONS FOR USING THE MODEM IN VEHICLES .............................................................................. 17
5.2.1 Recommended connection to the battery in a lorry ....................................................................... 17
5.2.2 Technical constraints in lorry ......................................................................................................... 19
5.3 GSM INDICATOR LED .................................................................................................................................. 20
5.4 AT COMMANDS ECHO DEACTIVATED.............................................................................................................. 20
5.5 VERIFYING GSM RECEIVE SIGNAL QUALITY.................................................................................................... 21
5.6 VERIFYING THE PIN CODE ............................................................................................................................ 22
5.7 VERIFYING MODEM REGISTRATION ON THE GSM NETWORK ............................................................................ 22
5.8 MAIN AT COMMANDS (HAYES) .................................................................................................................... 23
5.9 POWERING DOWN THE UNIT .......................................................................................................................... 24
5.10 UPDATING THE MODEM SOFTWARE .............................................................................................................. 24
6 TROUBLE SHOOTING..................................................................................................................................25
6.1 RS232 (V24) COMMUNICATION PROBLEM ..................................................................................................... 25
6.2 "ERROR" MESSAGE .................................................................................................................................... 25
6.3 "NO CARRIER" MESSAGE ........................................................................................................................... 26
7 FUNCTIONAL DESCRIPTION ......................................................................................................................27
7.1 ARCHITECTURE ............................................................................................................................................ 27
7.2 POWER SUPPLY ........................................................................................................................................... 28
7.2.1 General .......................................................................................................................................... 28
7.2.2 Protection....................................................................................................................................... 28
7.3 RS232 SERIAL LINK...................................................................................................................................... 29

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
7.3.1 General .......................................................................................................................................... 29
7.3.2 Auto-baud mode ............................................................................................................................ 30
7.3.3 Auto-power supply mode through the pin RI ................................................................................. 30
7.3.4 Pins description.............................................................................................................................. 30
7.4 AUDIO ......................................................................................................................................................... 31
7.4.1 Microphone .................................................................................................................................... 31
7.4.2 Loud-speaker ................................................................................................................................. 32
7.5 RESET ....................................................................................................................................................... 32
7.5.1 General .......................................................................................................................................... 32
7.5.2 RESET sequence .......................................................................................................................... 32
8 TECHNICAL CHARACTERISTICS ...............................................................................................................33
8.1 MECHANICAL................................................................................................................................................ 33
8.2 ELECTRICAL................................................................................................................................................. 34
8.2.1 Power supply ................................................................................................................................. 34
8.2.2 Audio interface ............................................................................................................................... 35
8.2.3 SIM Interface.................................................................................................................................. 35
8.2.4 GSM/DCS ...................................................................................................................................... 35
8.2.4.1 RF performances.................................................................................................................... 35
8.2.4.2 External GSM Antenna........................................................................................................... 36
8.2.5 RESET Signal ................................................................................................................................ 36
8.3 ENVIRONMENTAL CHARACTERISTICS.............................................................................................................. 37
8.4 STANDARDS /CONFORMITIES ....................................................................................................................... 37
9 SECURITY RECOMMENDATIONS..............................................................................................................38
9.1 GENERAL..................................................................................................................................................... 38
9.2 SECURITY IN A VEHICLE ................................................................................................................................ 39
9.3 CARE AND MAINTENANCE.............................................................................................................................. 39
9.4 YOUR RESPONSIBILITY.................................................................................................................................. 39
10 RECOMMENDED ACCESSORIES.............................................................................................................40
11 CLIENT SUPPORT......................................................................................................................................40
DECLARATION OF CONFORMITY.................................................................................................................41

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
Presentation
Entirely dedicated to the wireless markets throughout the world, the GenPro 18e allows a simple and rapid
integration of GSM / GPRS connectivity into M2M applications.
The GenPro 18e is a robust, reliable and long life product. Its very compact metal case makes it ideally
adapted to onboard standards.
The GenPro modem is Quad-Band 850/900/1800/1900 MHz and GSM/GPRS Class 10.
The GenPro 18e modem allows the immediate development of onboard high value-added telematic
solutions.
The GenPro 18e provides an external mode of operation, controlled by an external application through an AT
command set (see the ERCO & GENER Commands List).
This document describes the modem and provides the following information:
- General presentation,
- Functional description,
- Available basic services,
- Installation and use (first level),
- User-level trouble shooting,
- Recommended accessories.
For further information, please refer to the following documents:
- Commands List
- Application Notes
- Release Notes
- Client support (Hot-Line)

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
Warning
-TO AVOID ALL RISK OF ELECTROCUTION, DO NOT OPEN THE UNIT
-THE UNIT CONTAINS NO USER REPAIRABLE COMPONENTS
-THE UNIT MUST BE RETURNED TO THE MANUFACTURER FOR ANY REPAIRATION
-THE UNIT MUST NOT BE CONNECTED DIRECTLY TO THE MAINS SUPPLY. PLEASE USE A
SUITABLE EXTERNAL POWER SUPPLY.
In its continuing research into improving its products, ERCO & GENER reserves the right to modify its
products and documentation at any time.
Copyright and Disclaimer
All rights reserved. The reproduction, transfer, distribution or storage of part or the totality of the contents of
this document, in any form, mechanical or electronic, without the prior written authorization from ERCO &
GENER is strictly prohibited.
GenPro 18e is a trademark of ERCO & GENER.
Hayes is a registered trademark of Hayes Microcomputer Product Inc. The names of products and
companies mentioned in this document may be names or trademarks of their respective holders.
Use of certain products or services described in this document may require subscription or a paying
subscription. The availability of certain products or services described in this document can vary according to
the configurations and the materials.
In certain countries, restrictions of use of the equipment may apply. Contact your nearest legally qualified
local government representative for more information.
ERCO & GENER operate a method of continuous development. Consequently, ERCO & GENER reserves
the right to change and improve its products and documentation at any time and without notice.
The contents of this document are provided “as is”. All information contained herein is provided in good faith.
No responsibility can be assumed as to the precision and reliability of the contents of this document. Except
for the applicable obligatory laws, no guarantee in any form, explicit or implicit, including, but without being
limited to it, is granted as to the aptitude for marketing and suitability to a particular use. ERCO & GENER
reserves the right to revise this document or to withdraw it at any time and without notice.
ERCO & GENER cannot in any case to be held responsible for any loss of data or income, as well as
particular damage, incidental, consecutive or indirect.

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
1 References
1.1 Reference Documents
AT Commands Lists:
EG_GenProxxx_ xxx_1003_CL_000_UK
Software update procedure:
EG_GenProxxx_xxx_1003_UP_000_UK
Documents de reference GSM:
GSM 07.05.
GSM 07.07.
1.2 Abreviations
AC Alternative Current
ACM Accumulated Call Meter
AMR Adaptative Multiple Rate
AT Attention (prefix for modem commands)
BTS Base Transceiver Station
CLK ClocK
CMOS Complementary Metal Oxide Semiconductor
CS Coding Scheme
CTS Clear To Send
dB Decibel
dBc Decibel relative to the Carrier power
dBi Decibel relative to an Isotropic radiator
dBm Decibel relative to one milliwatt
DC Direct Current
DCD Data Carrier Detect
DCE Data Communication Equipment
DCS Digital Cellular System
DSR Data Set Ready
DTE Data Terminal Equipment
DTMF Dual Tone Multi-Frequency
DTR Data Terminal Ready
EEPROM Electrically Erasable Programmable Read-Only Memory
EFR Enhanced Full Rate
E-GSM Extended GSM
EMC ElectroMagnetic Compatibility
EMI ElectroMagnetic Interference
ESD ElectroStatic Discharges
ETSI European Telecommunications Standards Institute
FIT Series of connectors (micro-FIT)
FR Full Rate
FTA Full Type Approval
GCF Global Certification Forum
GND GrouND
GPIO General Purpose Input Output
GPRS General Packet Radio Service
GSM Global System for Mobile communications
HR Half Rate
I Input
IEC International Electrotechnical Commission

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
IMEI International Mobile Equipment Identification
I/O Input / Output
LED Light Emitting Diode
MAX MAXimum
ME Mobile Equipment
MIC MICrophone
Micro FIT Family of connectors from Molex
MIN MINimum
MNP Microcom Networking Protocol
MO Mobile Originated
MS Mobile Station
MT Mobile Terminated
NOM NOMinal
O Output
Pa Pascal (for speaker sound pressure measurements)
PBCCH Packet Broadcast Control Channel
PC Personal Computer
PCL Power Control Level
PDP Packet Data Protocol
PIN Personal Identity Number
PLMN Public Land Mobile Network
PUK Personal Unblocking Key
RF Radio Frequency
RFI Radio Frequency Interference
RI Ring Indicator
RMS Root Mean Square
RTS Request To Send
RX Receive
SIM Subscriber Identification Module
SMA SubMiniature version A RF connector
SMS Short Message Service
SNR Signal-to-Noise Ratio
SPI Serial Peripheral Interface
SPL Sound Pressure Level
SPK SpeaKer
SRAM Static RAM
TCP/IP Transmission Control Protocol / Internet Protocol
TDMA Time Division Multiple Access
TU Typical Urban fading profile
TUHigh Typical Urban, High speed fading profile
TX Transmit
TYP TYPical
UTC Universal Time Clock
VSWR Voltage Stationary Wave Ratio

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
2 Packing
2.1 Contents
The GenPro 18e is supplied with:
- 1 GenPro 18e packing case,
- 1 GenPro 18e modem,
- 2 fixing brackets,
- Instructions Sheet.
- 2-wire cable (Red/Black) with in-line fuse
2.2 Packing Case
Packing case external dimensions:
- Width: 54.5 mm,
- Height: 68 mm,
- Length: 108 mm.
An identification label is attached to the top of the packing case. It contains
- The ERCO & GENER logo,
- The product reference (GenPro 18e),
- CE mark and RoHS compliance mark,
- The IMEI 15-digit bar code.
Identification label dimensions:
- Height: 37 mm,
- Length: 70 mm.

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
2.3 Modem Labels
One production label, attached to the underside of the modem, provides the following information:
- CE mark,
- Crossed wheelie-bin mark (DEEE standard),
- DC supply (VDC),
- The IMEI 15-digit bar code.

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
3 General Presentation
3.1 Physical Description
Description of the GenPro 18e modem:
Connector
Micro-Fit 4pins/M
Front side Connector Sub HD
15pins/F
Rear side
Connector
SMA/F
SIM card cover GSM LED
Two fixing brackets for attaching the modem to a support:
Brides de fixation

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
3.2 External connections
3.2.1 Connections
3.2.1.1 GSM antenna connector
The GSM antenna connector is a 50impedance female SMA type.
3.2.1.2 4-pins Micro FIT female connector
This connector allows the connection of an external DC supply.
Pin N° Signal
1 +VDC
2 GND
3 NC
4 NC
WARNING: pins 3 and 4 are not wired. It is strictly forbidden to connect a supply voltage to these pins – the
modem may be damaged.
3.2.1.3 15-pin Sub HD female connector
This connector provides:
- The serial RS232 link,
- The audio line connection (microphone and loud-speaker),
- The BOOT and RESET signals.
Pin N° Description Circuit (V24 – RS232C) I/O
1 Signal detection / Buzzer 109 – DS – DCD O
2 Data transmission 103 – ED – TXD I
3 Boot BOOT I
4 Microphone + MIC2P I
5 Microphone - MIC2N I
6 Data reception 104 – RD – RXD O
7 Data Set Ready 107 – PDP – DSR O
8 Data Terminal Ready 108/2 – TDP – DTR I
9 Ground 102 – TS – GND -
10 Loud Speaker + SPK2P O
11 Clear To Send 106 – PAE – CTS O
12 Request To Send 105 – DPE – RTS I
13 Ring Indicator / 3,8V 125 – IA – RI O
14 Reset RESET I
15 Loud Speaker - SPK2N O
Note : the pin 3 is not used.

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
3.2.2 2-wire micro FIT supply cable
This cable provides power to the modem.
Component Characteristics
4-pin Micro FIT connector Type : MOLEX
Cable Length 1.5m
Wire Tinned copper 24 x 0.2 mm
Surface area : 0.75 mm²

EG_GenPro78e_1003_UG_007_UK Page 14 / 41
Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
4 Characteristics and Services
The GenPro 18e is a class 10 GSM or GSM/GPRS modem intended for asynchronous binary data
transmission, fax Group3 (Class 2), SMS and voice.
The features of the GenPro 18e modem are shown in the table below.
GenPro 18e modem
GSM
- Quad-Bands 850/900/1800/1900 MHz
- ETSI GSM Phase 2+ Classe 4 (2W @ 850 / 900 MHz)
Classe 1 (1W @ 1800 / 1900 MHz)
- SIM Toolkit Release 99
VOICE
- Voice (GSM mode)
- Téléphonie, Emergency call 112
- Full Rate, Enhanced Full Rate, Half Rate et AMR (FR/EFR/HF/AMR)
- Echo cancellation and noise reduction features
- Full Duplex Mains Libres
DATA
- GPRS Multi-Slot Class 10 supported (4Rx / 2Tx)
- PBCCH/PCCCH supported, coding schemes supported : CS1 - CS4
- Circuit de Données asynchrones, transparent et non-transparent 9600 (Standard) à 14400bds (Selon
réseau)
- Compatible Group 3 FAX
- SMS Text, PDU, MT/MO modes and SMS Cell Broadcast
Interfaces
- GSM antenna: SMA-F connector
- Electrical Power: +5.5 à +32 VDC (micro-FIT connector)
- RS232 (300 up to 115200 bds) + Audio through Sub-D 15 pins female connector
- AT commands : GSM 07.05 et 07.07
- SIM reader(SIM 3V – 1,8V)
Supplied accessories
- Fixing brackets (x2)
- 2-wire micro FIT supply cable
Option
- Auto-power supply through the pin RI for external application (*)
(*) Consult us

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
5 Using The Modem
5.1 Starting with the modem
5.1.1 Mounting the modem
To mount the modem on a support, use the fixing brackets as shown in the diagram below:
Note:
- Must be fixed to a flat
surface.
- Maximum height of the
screw head height: 2 mm
5.1.2 Installation of the modem
To install the modem, it is recommended to perform the following operations with the modem turned off:
- Remove the SIM card cover on the rear side.
- Carefully insert the SIM card into its holder.
- Push the SIM card until the "click", which confirms you the SIM Card is correctly positioned.
- Replace the SIM card cover.
- Connect the GSM antenna to the SMA connector.
- To connect to a DTE, connect the V24 link using the 15-pin Sub HD cable.
- Connect the supply cable to an external regulated DC source (for automobile applications, refer to
chapter 5.2 Recommendations for using the modem in vehicles).
- Connect the supply cable to the modem and turn on the power supply. The GSM LED will light up.
The modem is now ready. Refer to chapter 5.8 Main AT commands (HAYES) for a description of
the commands for configuring and using the modem.

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Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
5.1.3 Communication with the modem
Connect the RS232 cable between the DTE (the COM port) and the modem (DCE).
Configure the DTE RS232 port as follows:
Data rate: 9600 bps,
Data size: 8 bits,
Parity: None,
Stop bits: 1,
▪Flow control: hardware.
Via the DTE (a PC running a communications application such as HyperTerminal), enter the command
AT(CR). The modem should reply with OK.
In the case where no communication can be established with the modem:
Verify the RS232 connexion between the DTE and the modem (DCE),
Verify the configuration of the COM port on the DTE.
Some examples of AT commands which can be sent to the modem once the communication has been
established and verified (these commands are explained in detail later in the document):
AT+CGSN : the modem should reply with a 15 digit number (beginning with "35873000xxxxxxx").
AT+CPIN="xxxx" : enter the code of the SIM card xxxx (if active).
AT+CSQ : verify the GSM signal reception level.
AT+CREG ? : verify the registration of the modem on the network.
ATD<telephone number> : start a voice call.
ATH : hang-up (end of the call).
For further information about these AT commands and their associated parameters, refer to the "Commands
List" from ERCO & GENER.
5.1.4 Extraction of the SIM card
To remove the SIM card from the modem, it is recommended to apply the following instructions, the modem
not power supplied:
- Remove the SIM card cover from the rear side.
- Push on the SIM card (simple pression) up to the "click", allowing its eject.
- Remove carefully the SIM card from its holder.
- Place the SIM card cover.
- Apply a Reset or an ON / OFF to save these operations.

EG_GenPro78e_1003_UG_007_UK Page 17 / 41
Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
5.1.5 Re-initialisation of the modem
The hardware RESET signal is available on pin 14 of the 15-pin Sub HD connector. The modem is re-
initialised when this RESET signal is held at a low level for at least 500µs.
WARNING: This RESET signal should be considered as a means of re-initialising the modem in cases of
emergency only. For further details concerning the RESET of the modem, see the chapter
7.6 RESET.
5.2 Recommendations for using the modem in vehicles
WARNING: The power supply connector on the GenPro 18e must NOT be connected directly to the
battery of a vehicle.
5.2.1 Recommended connection to the battery in a lorry
All Lorries have a circuit breaker outside the cabin. The circuit breaker is necessary for security reasons. For
example, if a fire breaks out in the lorry’s electric box, the driver may cut the power source to avoid further
danger and damage (explosion).
The circuit breaker is connected to the ground of the lorry, usually connected to the fuse box. As such, most
lorry circuit breakers cut the ground connexion rather than the battery power side as shown in the diagram
below:

EG_GenPro78e_1003_UG_007_UK Page 18 / 41
Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
GenPro 18e
The diagram above shows a recommended connexion, where the modem is connected after the circuit
breaker to the ground of the lorry (or in the fuse box) and NOT directly to the earth of the battery

EG_GenPro78e_1003_UG_007_UK Page 19 / 41
Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
5.2.2 Technical constraints in lorry
It is highly recommended to NOT connect the modem supply directly the battery but instead to the circuit
breaker. Otherwise the modem may be damaged when the lorry is starting and the circuit breaker is closed.
In this case the ground of the lorry and the ground of the battery will be connected together via the modem
as shown in the diagram below:
GenPro 18e
Example of a forbidden electrical connexion (risk of damage to the modem)
The diagram above shows an electrical connexion which may damage the modem because its ground is
connected directly to the earth of the battery.
In this example, when the circuit breaker is closed, the current flows via the modem and the electrical circuits
in the lorry (dash-board for example). When the lorry’s starter motor is used it could result in the cables and
or the modem being damaged or destroyed.
The internal circuits of the modem are not designed to withstand the high currents associated with starter
motors.

EG_GenPro78e_1003_UG_007_UK Page 20 / 41
Description and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modifications.
5.3 GSM indicator LED
The state of the modem is indicated by the GSM LED located on the rear side of the modem, close to the
SIM holder (see chapter 3.1 Physical Description).
The table below shows the meaning of the different states of the GSM LED :
GSM LED LED activity Modem state
ON LED on fixed The modem is powered, it is ready to function but not
yet recognised by the network; the PIN code has not
yet been entered or the antenna is not connected.
LED flashing
(once every 2
seconds)
The modem is powered, the PIN code is active, the
modem is recognised by the network and is ready to
make or receive a call (Idle mode).
LED flashing
(Once a second)
The modem is powered and currently in communication
(Voice, Data or Fax).
OFF LED off The modem is not powered or is in the RESET phase.
5.4 AT commands Echo deactivated
If no echo is returned when entering an AT command, it could be that :
- the “Local echo” of your communication application is not activated,
- and/or the modem’s echo function has been deactivated.
The echo is configured by the command ATE and requires a back-up with the command AT&W.
To activate the modem echo, enter the command ATE1.
When using a communication application to send AT commands to the modem, it is recommended to :
- deactivate the "local echo" in your communication application,
- activate the modem echo (enter the command ATE1).
For a communication Machine to Machine with the modem, it is recommended to deactivate the modem
echo (enter the command ATE0) to avoid the CPU receiving redundant responses.
For more information about the ATE command see the ERCO & GENER "Commands List".