CEP Terminals CT63 NG User manual

CT63 NG Terminal
User Manual
Revision 1.2

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Important information
This technical description contains important information for start up and use of the CT63 NG Terminal.
Read it carefully before you start working with the CT63 NG Terminal.
The warranty will be void should damage occur due to non-compliance with these instructions for use.
We cannot accept any responsibility for consequential loss.
We cannot be held responsible for material loss or personal injury that is due to non-compliance with
the safety instructions. The warranty will be void in such circumstances.
The CT63 NG Terminal contains highly integrated components which can be damaged by electrostatic
discharge if the user would open the housing.
CEP preserves the right to change the included information without notice and doesn’t take
responsibility for errors in the document and/or missing information.
Therefore only touch the CT63 NG Terminal on the housing or connectors and avoid
touching the components on the board.
Safety Instructions
Warning
When using products which are exposed to electric voltage the valid regulations have to be
observed.
Before opening of a device always make sure that the device is disconnected from the power supply.
You should only use tools on components, modules or devices if they are disconnected from the power
supply and the electric charge, which may still be stored in some components inside the device, has
been discharged.
All cables and wires which are energized and connected to the device, the module or components have
to be checked regularly for any damage of the isolation shield or fractures of the cables. If the supply
cables are visibly damaged the device must be taken out of operation immediately until the faulty cable
has been replaced.
When using components or modules, the specification given in the corresponding description of these
components must strictly be observed. The device shall be operated only by appropriately qualified
personnel.
This device shall only be used for its intended purpose.
Please note that we are not responsible for any errors in usage or wireless connection. Therefore we
cannot accept any responsibility for consequential loss.
In case those measurements with the opened housing are necessary, an isolating-transformer has to be
integrated for safety reasons. Alternatively the voltage can be supplied by an appropriate power supply
which complies with the safety regulations. All wiring work has to be done in a voltage free state only.

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Table of Contents
Important information...................................................................................................................................................... 2
Safety Instructions ............................................................................................................................................................ 2
1 General Information ................................................................................................................................................. 6
1.1 Contact for Support .......................................................................................................................................... 6
1.2 Conventions Used in this Manual ..................................................................................................................... 6
1.3 Related Documentation.................................................................................................................................... 7
1.4 Abbreviations .................................................................................................................................................... 7
1.5 Revision History................................................................................................................................................. 8
2 Product Description .................................................................................................................................................. 9
2.1 Overview ........................................................................................................................................................... 9
2.2 Identification...................................................................................................................................................10
2.3 Physical Dimensions and Weight .................................................................................................................... 10
2.4 Product Features and Technical Data .............................................................................................................11
2.5 CEP Certified Accessories................................................................................................................................ 13
3 Safety and Product Care ......................................................................................................................................... 14
3.1 Audience and Intended Use............................................................................................................................14
3.2 Safety instructions .......................................................................................................................................... 14
3.3 General precautions........................................................................................................................................ 14
3.4 SIM card precautions ......................................................................................................................................15
3.5 Antenna precautions....................................................................................................................................... 15
4 Electrical Description .............................................................................................................................................. 15
4.1 Power Connector ............................................................................................................................................16
4.2 Antenna Connector......................................................................................................................................... 17
4.3 SIM card reader...............................................................................................................................................17
4.4 RS232 Serial Port............................................................................................................................................. 18
4.4.1 Serial Data ...............................................................................................................................................19
4.5 Mini USB Connector........................................................................................................................................ 19
5 Operation ................................................................................................................................................................19
5.1 Switch ON the modem .................................................................................................................................... 19
5.2 Configuration of the bit rate on the serial interface....................................................................................... 20
5.3 Power cycle the modem ................................................................................................................................. 20
5.4 Using low power mode of the modem ...........................................................................................................20

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5.4.1 Low power mode with RTS/CTS/RING under DTE control...................................................................... 20
5.4.2 Low power mode with Looped RTS/CTS .................................................................................................21
5.5 Operating states / green LED ..........................................................................................................................21
5.6 Controlling the Outputs .................................................................................................................................. 22
5.7 Power consumption during Regular Operation..............................................................................................22
6 Installation of the modem ......................................................................................................................................23
6.1 Where to install the modem........................................................................................................................... 23
6.1.1 Environmental conditions ....................................................................................................................... 23
6.1.2 GSM Signal strength................................................................................................................................23
6.1.3 Connection of components to CT63 NG Terminal ..................................................................................23
6.1.4 Network and Subscription....................................................................................................................... 23
6.2 How to install the modem .............................................................................................................................. 23
6.2.1 Power supply........................................................................................................................................... 23
6.2.2 Securing the modem............................................................................................................................... 24
6.3 Antenna........................................................................................................................................................... 24
6.3.1 General.................................................................................................................................................... 24
6.3.2 Antenna type........................................................................................................................................... 24
6.3.3 Antenna placement................................................................................................................................. 24
6.3.4 The antenna cable...................................................................................................................................25
6.3.5 Possible communications disturbances .................................................................................................. 25
7 Optional variants..................................................................................................................................................... 26
7.1 CT63 NG with Mini USB with USB –Power (host powered) ...........................................................................26
7.2 RS485 Sub D9 ..................................................................................................................................................26

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Table Overview
Table 1: Abbreviation........................................................................................................................................................ 7
Table 2: Documentation Change Log................................................................................................................................ 8
Table 3: Feature Overview CT63 NG...............................................................................................................................12
Table 4: Accessories List.................................................................................................................................................. 13
Table 5: RJ11 Pin and Signals Description....................................................................................................................... 17
Table 6: Electrical characteristics of the serial port signals ............................................................................................ 18
Table 7: Power Consumption in Low Power Mode with RS232 under DTE control ....................................................... 21
Table 8: Power Consumption in Low Power Mode with Looped RTS/CTS .....................................................................21
Table 9: Operating states of the green LED ...................................................................................................................21
Table 10: Power consumption in standby, idle and low power mode ...........................................................................22
Table 11: Mini USB with host powered Pin Signal .......................................................................................................... 26
Figure Overview
Figure 1: Connector on rear side of the Terminal............................................................................................................. 9
Figure 2: Connectors on front side of the Terminal.......................................................................................................... 9
Figure 3: Drawing of the Terminal’s Housing..................................................................................................................11
Figure 4: RJ11 Pin Connector ..........................................................................................................................................16
Figure 5: Looping RTS with CTS in the modem ............................................................................................................... 18
Figure 6: Mini USB Type A/B connector..........................................................................................................................19
Figure 7: CT63 Mini USB with USB Power (host powered) Pin Connector .....................................................................26
Figure 8: RS485 Sub-D 9-pin female connector with pin numbering .............................................................................26

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1General Information
This User Manual consists of the following chapters:
Chapter
Description
1
General Information provides basic information such as the conventions for the
warning levels, applicable related documentations, used abbreviations, a revision
history and contact information.
2
Product Description provides a brief overview about the mechanical specification of
the product (including size and weight) as well as an overview of the functions and
features of the device as well as the available accessories.
3
Safety and Product Care addresses the audience for this manual, the indented use of
this device and safety-related information important to read before using the device.
4
Electrical Description describes the electrical characteristics and pin allocation of the
device’s connectors.
5
Operation provides details relating to the commissioning of the device, including
details on activating special features such as the low power mode.
6
Installation of the Modem provides important instructions about how to install the
device for the M2M application.
7
Optional variants provides the electrical characteristics of optional product variants.
1.1 Contact for Support
Please submit your request to CEP customer support using the following online form:
http://www.cepag.de/en/support/support-form
Information about CEP AG, products and accessories, including FAQs, are available from the following
web site: http://www.cepag.de.
1.2 Conventions Used in this Manual
The following conventions for warning levels are used in this manual:
Warning
Warnings against hazards that may result directly in serious injuries or death in case of non-
observance.
Caution
Warnings against hazards that may result in injuries in case of non-observance.
NOTICE
Warnings against hazards that may result in material damage in case of non-observance.

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Indicates that the device can be damaged by electrostatic discharge.
This note contains helpful suggestions or references to material not covered in the
document.
1.3 Related Documentation
Please consult the download zone of the CEP AG website for additional documents related to CT63 NG, such
as AT command manuals. Note that such type of documents can be accessed online only after you have
registered on our website and agreed with our terms of use. Please follow this link to register for a user
account:
http://www.cepag.de/en/en-nda-reg-form
…or use the following link to login if you already have a valid user account:
http://www.cepag.de/en/en-user-login
1.4 Abbreviations
Abbreviation
Explanations
CSD
Circuit Switched Data
DCE
Data Circuit Terminating Equipment
DTE
Data Terminal Equipment
GPRS
General Packet Radio Service
GSM
Global System for Mobile Communication
MS
Mobile Station
MT
Mobile Terminated
PDU
Protocol Data Unit
SIM
Subscriber Identity Module
SMS
Short Message Service
URC
Unsolicited Result Code
VIH
Volt Input high
VIL
Volt Input low
VSWR
Voltage Standing Wave Ratio
Table 1: Abbreviation

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1.5 Revision History
Revision
Date
Changes
Rev 1.0
14.10.2015
First version of the document.
Rev 1.1
06.11.2015
Corrected Section 1.3. Updated product naming.
Rev 1.2
09.12.2015
Updated Sections 4.4 (RS232 Serial Port) and 5.4 (Using low
power mode of the modem).
Added new Section 5.2 (Configuration of the bit rate on the
serial interface)
Table 2: Documentation Change Log

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2Product Description
2.1 Overview
The pictures below show the mechanical design of the CT63 NG Terminal along with the positions of the
different connectors and mounting holes. The CT63 NG Terminal case is made of durable PC/ABS
plastic.
Figure 1: Connector on rear side of the Terminal
Figure 2: Connectors on front side of the Terminal

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Please note the following:
The terminal can be securely fitted into your application by using the mounting holes positioned at the
two of the corners of the device make it possible to securely bolt the modem into your application.
The SIM card is mounted in the modem, and is accessible by to the user under a lid without the need to
use any tools.
Section 4 Electrical Description“2. Electrical Description” describes the pins and electrical characteristics or
of the modem’s terminal’s various connectors are described in
Section 4.2 Antenna Connector“2.3 Antenna Connector” provides information about the antenna
connector is found in “2.3 Antenna Connector”
A special DIN Rail Mounting Bracket can be offered as an accessory item (Art-Nr. 12304)
which allows installation of the modem in industrial environments using DIN Rails.
2.2 Identification
On the bottom of the device, you will find the type label.
Label
Description
S/N
Serial number1
Serial number
IMEI
International Mobile
Equipment Identity
FW
GSM firmware version
HW-Rev.
Hardware Revision
Number + Production date
CE conformity mark
Disposal in accordance
with European Directive
2002/96/CE
2.3 Physical Dimensions and Weight
Overall dimensions: 77 x 67 x 26 mm
Weight: approx. 80g
1
Note that the serial number consists of a 4-digit product ID followed by the device’s IMEI.

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Figure 3: Drawing of the Terminal’s Housing
2.4 Product Features and Technical Data
NOTICE
CEP AG may, at any time and without notice, make changes or improvements to the products and
services offered and / or cease producing or commercializing them.
Category
Features
Details
Air Interface
2G Frequency Band
850 / 900 / 1800 / 1900 MHz
GPRS Class
Class 12
GPRS Features
Full PBCCH support
Mobile Station Class B
Coding Scheme 1 –4
Output Power
Class 4 (2W) for GSM850/GSM900
Class 1 (1W) for GSM1800/GSM1900
CSD
Up to 9.6 kbps,
V.110, RLP, non-transparent
USSD
SMS
Point-to-point MT and MO
Text and PDU mode, Cell Broadcast
Jamming Detection

Hardware Features
Memory
5 MB RAM / 10 MB Flash
SIM Card Holder
1x (1,8/3 Volt)
LEDs
1 GSM + 2 Configurable
Real-time Clock
RTC with alarm functionality
Type Approvals
CE
Connectors
D-Sub (9-pin)
1x Female (RS232)

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Category
Features
Details
USB
1x Mini-USB (USB 2.0)
RJ11
1x Power + IOs (1x Analogue Input; 1x Output)
Interfaces /
Connectors
Antenna
1x (FME Male)
RS232
1x (Sub-D9 Female)
RS485 (optional)
1x (Sub-D9 Female)
USB 2.0
1x (Mini-USB)
Analog Inputs
1x (RJ11 connector)
Outputs
1x (RJ11 connector)
Software
AT Command Set
Gemalto standardized and extended AT commands (Hayes,
TS 27.007 and 27.005)
Programming Language
Java profile IMP-NG & CLDC 1.1 HI
SIM Application Toolkit
SAT Release 99
TCP/IP Stack
Access via AT commands and transparent TCP services
SW Update
Serial / USB / FOTA
Power Management
Voltage Range
5V - 32V
Hardware
Characteristics
Operating Temperature
-40°C to +80°C
Dimensions
77x66x26 mm
Weight
80g
Table 3: Feature Overview CT63 NG

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2.5 CEP Certified Accessories
Art-Nr.
Description
12002
Power supply 230V AC / 12 V DC with 6-pin RJ11 connector
12003
Power cable with 6pin RJ11 connector and with open ends
12021
FME female Magnetic Antenna / Pentaband (Quad&UMTS)
12016
FME female Rectangular Antenna / Pentaband (Quad&UMTS)
12020
FME female Patch Antenna/ Pentaband (Quad&UMTS)
12006
Roof-mount antenna, FME female waterproof, 900/1800 MHz
12004
RS232 cable, 1.5m for PC connection
12304
DIN Rail Mounting Bracket
Table 4: Accessories List
Please contact your distributor or CEP AG for availability or check CEP’s webpage www.cepag.de.

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3Safety and Product Care
This device has been designed in accordance with state-of-the-art standards, manufactured with
utmost care using high-quality materials, and tested. Nevertheless, its use may constitute a risk to
persons or cause material damage.
The following safety instructions must be followed in order to ensure the safety of users and the device.
NOTICE
If these instructions are ignored, CEP AG will not assume responsibility for any damages that are
incurred. CEP AG may refuse warranty claims where evidence of product misuse is found.
Please read the information in this section and the information in Section 6 Installation of the modem
before starting your integration work!
3.1 Audience and Intended Use
This terminal product is targeted towards system integrators who need to add a wireless
communications link to their M2M application, in order to capture data from the application as well as
to remotely control that application. Any other use is not indented.
3.2 Safety instructions
PLEASE READ THESE SAFETY INSTRUCTIONS AND KEEP A COPY OF THEM.
Always ensure that use of the modem is permitted. The modem may present a hazard if used in proximity
to of personal medical electronic devices. As a rule, the modem must not be used in hospitals, airports or
planes.
Never use the modem at a gas station, refueling point, blasting area or in any other environment where
explosives may be present.
Operating the modem close to other electronic devices, such as antennas, television sets, and radios may
cause electromagnetic interference.
This product is intended to be used with the antenna or other radiating element at least 20 cm away from
any part of the human body. In applications where this rule cannot be applied, the application designer is
responsible for providing the SAR measurement test report and declaration.
You are responsible for observing your country's safety standards, and where applicable, the relevant
wiring rules.
3.3 General precautions
The CT63 NG Terminal as a stand-alone item is designed for indoor use only. To use outside it must be
integrated into a weatherproof enclosure. Do not exceed the environmental and electrical limits as
specified in Section 2.4 Product Features and Technical Data.
Avoid exposing the modem to lighted cigarettes, naked flames or to extreme hot or cold temperatures.
Never try to dismantle the modem yourself. There are no components inside the modem that can be
serviced by the user. If you attempt to dismantle the modem, you may invalidate the warranty.
The CT63 NG Terminal must not be installed or located where the surface temperature of the plastic case
may exceed 85°C.

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All cables connected to the CT63 NG Terminal must be secured or clamped, immediately adjacent to the
modem's connectors, to provide strain relief and to avoid transmitting excessive vibration to the modem
in the installation.
Ensure the cables, supplying power, audio headset, and input cable to the CT63 NG Terminal, does do not
exceed 3meters.
To protect power supply cables and meet the fire safety requirements when the unit is powered from a
battery or a high current supply, connect a fast 1.25A fuse in line with the positive supply.
Do not connect any incompatible component or product to the CT63 NG Terminal.
3.4 SIM card precautions
Before handling the SIM card in your application, ensure that you are not charged with static electricity.
Use proper precautions to avoid electrostatic discharges.
When the SIM card hatch is opened, the SIM card connectors lie exposed under the SIM card holder.
Caution! Do not touch these connectors! If you do, you may release an electrical discharge that could
damage the modem or the SIM card.
When designing your application, the SIM card’s accessibility should be taken into account. We always
recommend that you have the SIM card protected by a PIN code. This will ensure that the SIM card
cannot be used by an unauthorized person.
3.5 Antenna precautions
If the antenna is to be mounted outside, consider the risk of lightning. Follow the instructions provided
by the antenna manufacturer.
Never connect more than one modem to a single antenna. The modem can be damaged by radio
frequency energy from the transmitter of another modem.
Like any mobile station, the antenna of the modem emits radio frequency energy. To avoid EMI
(electromagnetic interference), you must determine whether the application itself, or equipment in the
application’s proximity, needs further protection against radio emission and the disturbances it might
cause. Protection is secured either by shielding the surrounding electronics or by moving the antenna
away from the electronics and the external signals cable.
The modem and antenna may be damaged if either come into contact with ground potentials other than
the one in your application. Beware, ground potential are not always what they appear to be.
4Electrical Description
The modem uses the following standard connectors:
RJ11 6-way (power + 1 analogue input + 1 output)
Mini USB (USB 2.0)
SIM card reader
FME male coaxial jack (antenna connector)
Sub-D female socket, 9 pin (RS232 serial port)

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4.1 Power Connector
An RJ11 6-way connector, as shown and described below, serves as a means of supplying and
controlling DC power to the modem. The use of an external power supply is necessary as the USB port
is not intended to be used as power source.
2
The supply voltage VCC required by the modem is 5V - 32V DC. Please note that applying the supply
voltage does not switch the modem on. To do so an additional active-high control signal, TO_IN, must
be applied for > 1 second.
Please see chapter 5.1 Switch ON the modem for further important details about TO_IN and power
supply requirements, especially if TO_IN is applied in parallel to VCC.
VCC and GND are reverse-polarity and over-voltage protected as long as antenna interface
and the user’s application are unused or connected to separate grounds.
Figure 4: RJ11 Pin Connector
PIN
Signal
Direction
Limits
Description
1
VCC
Input
5 –32V
Positive power input, DC
2
ADC_IN
Input
0-32V
Analogue Input
3
EMERG_OFF
Input
5 –32V
Active high control line used to
switch off the terminal
VIH > 5V, VIL < .5V
Power off: t >1s
4
TO_IN
Input
5 –32V
Positive edge triggered signal;
used to switch on the modem
VIH > 5V, VIL < 0.5V
Power on: t >1s after VCC
available
VIH = Volt Input high
VIL = Volt Input low
2
This Statement does not apply to the USB Host Powered version of the CT63 NG.

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PIN
Signal
Direction
Limits
Description
5
DIG_OUT
Output
5 - VCC
Digital Output VCC, max. 400
mA
6
GND
Input
-
Negative power (ground) input
and return path for TO_IN and
EMERG_OFF
Table 5: RJ11 Pin and Signals Description
The TO_IN signal requires a positive “edge” (a sharp” signal transition from low to high) to
turn the modem on. This transition should be a rising signal from 0V (GND) to VCC, or at least
a large fraction of that voltage range, and must be applied at the same time as VCC or after it.
Very slow transitions (significantly slower than many milliseconds) or very small transitions
(e.g. only few volts instead of 0V to VCC) will not turn on the module (since they are not
considered to be a “positive edge”).
4.2 Antenna Connector
The antenna connector allows transmission of radio frequency (RF) signals between the modem and an
external customer-supplied antenna. The modem is assembled with a 50 Ohms, FME male coaxial jack.
The customer-selected antenna should fulfil the following requirements:
Frequency range: Quadband (GSM 850/ 900/ 1800/ 1900 MHz)
Bandwidth: 80 MHz in EGSM 90
Gain: <3dBi
Impedance: 50 Ohms
Input Power: >33 dBm (2W) peak power in GSM
VSWR recommended: <2
4.3 SIM card reader
The CT63 NG Terminal is fitted with a SIM card reader designed for 1.8V and for 3V SIM cards. It is the
flip-up type which is lockable in the horizontal position and is accessed through a removable panel.

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4.4 RS232 Serial Port
The modem supports a standard RS232 serial interface via its 9 pin Sub-D connector, shown below. In
line with serial communication terminology the CT63 NG Terminal should be considered as the data
circuit-terminating equipment (DCE) and the external application or computer as the data terminating
equipment (DTE). The maximum baud rate to communicate with the CT63 NG Terminal is 230400 kbit/
s.
Some functions need to be configured or activated using module specific AT commands. Please refer to
the appropriate AT command manual referenced in Section xyz for further details.
NOTICE
The RS232 interface requires full RTS / CTS Flow Control support by the remote station connecting to
the terminal. If you just have Rx/Tx/GND connected in the serial interface, you have to connect the RTS
with the CTS pin in order to be able to communicate with the module (Pins 7 and 8 on the DCE, i.e.
modem; see picture below).
Figure 5: Looping RTS with CTS in the modem
PIN
Signal
Direction
Limits
Description
1
DCD
Output
> + 4V
<- 4 V
Data carrier detect
2
RD
Output
> + 4V
<- 4 V
Received data
3
TD
Input
> + 2,4V
< 0.8 V
Transmitted data
4
DTR
Input
> + 4V
< 0.8 V
Data terminal ready
5
GND
-
0 V
Ground connection
6
DSR
Output
> + 4V
< - 4 V
Data set ready
7
RTS
Input
> + 2,4V
< 0.8 V
Request to send
8
CTS
Output
> + 4V
< - 4 V
Clear to send
9
RI
Output
> + 4V
< - 4 V
Ring indicator
Table 6: Electrical characteristics of the serial port signals

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4.4.1 Serial Data
The modem supports the standard data character format of
Programmable baud rate (300bps to 230,400bps).
Auto-configuration mode with auto-baud (1,200bps to 230,400bps).
Multiplex ability according to GSM 07.10 Multiplexer Protocol.
4.5 Mini USB Connector
The modem supports a standard USB 2.0 Full Speed slave interface to receive AT-commands as well as
data transmissions.
Drivers for several operating systems (e.g. Windows Vista, Windows XP or Linux) are available for
download from the CEP AG website (for registered users only).
Figure 6: Mini USB Type A/B connector
5Operation
5.1 Switch ON the modem
There are two ways to switch on the modem, once power is applied:
assert TO_IN to high level for > 1s
activate the RS232 control line DTR for >0.2s
The modem is fully operational after 4 seconds. Logging onto a network may take longer than this and
is outside the control of the modem. The modem can be configured to start up at the time power is
applied by permanently tying power connector signals TO_IN (pin 4) and VCC (pin 1) together.
DTR must be cycled from low to high.
Although this will not be an issue in almost all typical applications of the modem, there are a few cases
in which the modem might not recognize the power up signal. This is no failure of the modem itself, the
same would apply to almost any electronic device that provides a separate “power on” or “reset”
signal.
Possible cases are the following:

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Older power supplies often have large capacitors which lead to slow leading and falling edges (tying TO_IN
in parallel to VCC instead of using a separate dedicated digital signal might increase this effect)
Slow analogue signals used to assert TO_IN
If you are in doubt, please
Use the mains power adapter that is provided by your distributor and is known to work properly with your
modem.
Make sure that your signal and system design is according to the above.
Consult our support team that will be more than happy to assist you.
5.2 Configuration of the bit rate on the serial interface
Please note that autobauding is activated by default upon delivery (using the AT command “AT+IPR=0”,
please refer to Section 4.6 “AT+IPR Bit Rate” of the BGS5 AT Command Guide for further details).
5.3 Power cycle the modem
There are two ways to switch off (power down) the modem as described below:
EMERG_OFF to high level for t >1s
Turn off, or disconnect the power supply.
5.4 Using low power mode of the modem
Below are some short descriptions on how to enter and exit the low power state of the modem.
NOTICE
Please note that the power consumption in low power mode is different according to the used method!
5.4.1 Low power mode with RTS/CTS/RING under DTE control
Enabling the low power mode:
Wait until the GSM module is logged into the GSM network
Send the AT command "AT^SPOW=2,2000,3" (activating the serial interface for 2000 ms = 2 s to receive
the wake-up AT command)
Set the RTS control line on DTE side from High level to Low level
A stable low-power mode should be achieved after approx. 1-2 minutes.
Disabling the low power mode by user:
Set the RTS control line on DTE side from Low level to High level
The RS-232 transceiver is activated immediately for the time-period which had been previously configured
when enabling the low power mode, i.e. for a duration of 2 seconds
Within these 2 seconds the following command must be sent to disable the low power mode:
“AT^SPOW=1,0,0”
Disabling the low power mode upon receiving GSM activity
Call the number of the SIM card inserted in the modem, or send an SMS message
The RING line will change from Low to High level
Set the RTS Line on the DTE side from Low to High level