This technical description contains important information for start up and use of the CT63 Terminal.
Read it carefully before you start working with the CT63 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 incompetent use or
non-compliance with the safety instructions. The warranty will be void in such circumstances.
The CT63 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.
Safety Instructions
Before opening of a device always pull the mains adapter or 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 has to be taken out of operation immediately until the
faulty cable has been exchanged.
When using components or modules it is necessary to strictly observe the specification given in the
corresponding description of these components. If a description for a private end-customer not clearly
states which electric data is valid for a component or a module, how to wire the device, which external
components or additional devices can be connected or which parameters these components are
allowed to have, a specialist must be contacted.
Before putting a device into operation, it has to be clarified, whether this device or module is meant for
the field of application. In case of doubt ask specialists or the manufacturer of the device.
Please note that we are not responsible for any errors in usage or connection. Therefore we cannot
accept any responsibility for consequential loss.
Devices which operate with >35 Volt have to be connected by a specialist. Before putting the device
into operation it should be checked that there is no current leakage on the housing.
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.
The pictures below show the mechanical design of the CT63 Terminal along with the
positions of the different connectors and mounting holes. The CT63 Terminal case is
made of durable PC/ABS plastic.
RJ11 6-way (power connector)
Mini USB (USB 2.0)
SIM card reader
FME male coaxial jack (antenna connector)
Sub-D female socket, 9 pin (RS232 serial port)
2.1 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. It is necessary to connect an
external power supply, since the available power on the USB port is not sufficient to
run the modem.
The supply voltage, VCC, required by the modem is 5V - 32V DC. Application of 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 “3.1 Switching 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.
The antenna connector allows transmission of radio frequency (RF) signals between
the modem and an external customer-supplied antenna. The modem is fitted with a
50Ω, FME male coaxial jack.
The CT63 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.
2.4 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 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 CT63Terminal is 230400 kbit/s.
The electrical characteristics of the serial port signals are shown below:
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.
RD is an output signal that the modem uses to send data to the application.
Serial Data To Modem (TD)
TD is an input signal, used by the application to send data to the modem.
2.7 Control Signals – RTS, CTS, DTR, DSR, DCD, RI
Request to Send (RTS)
RTS is used to condition the DCE for data transmission. The default level is high by
internal pull up. 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 low to communicate with the modem. The modem will
respond by asserting CTS low, indicating it is ready for communication.
Clear To Send (CTS)
CTS indicate that the DCE 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.
Data Terminal Ready (DTR)
DTR indicates that the DTE is ready to transmit and receive data. It also acts as
hardware „hang-up‟, terminating calls when switched high. The signal is active low.
You can define the exact behaviour of DTR with an AT command. The DTR line can
also be used to switch on the modem when activated for 0.2 seconds. The DTR line
must be deactivated prior to switching off the modem to ensure it switches off
(powers down) correctly.
Data Set Ready (DSR)
An active DSR signal is sent from the modem to the application (DTE) to confirm that
a communications path has been established. DSR has two modes of operation,
settable using the AT command AT&S.
Data Carrier Detect (DCD)
DCD indicates that the DCE is receiving a valid carrier (data signal) when low. You
can define the exact behaviour of DCD with an AT command.
Ring Indicator (RI)
RI indicates that a ringing signal is being received by the DCE when low. You can
define the exact behaviour for RI with an AT command.
The modem supports a standard USB 2.0 Full Speed slave interface interface for ATcommands. The maximum baud rate to communicate with the CT63 Terminal is up to
12Mbit/s.
Drivers for several operating systems (e.g. Windows Vista, Windows XP or Linux) are
available. Please ask us (support@cepag.de).
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
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. In this case DTR must be
used to switch the modem on again after it has been switched off or reset, while
power is still applied.
Note: DTR must be cycled from low to high.
Note: 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”).
Although this will not be an issue in almost all typical applications of the modem,
please consider following points:
Large capacitors in your power supply which will lead to slow leading and
falling edges (issue does not apply with modern stabilized switching regulator
power-adaptors) AND TO_IN tied in parallel to VCC (instead of separate
dedicated digital signal)
Slow analogue signals used to assert TO_IN
TO_IN signal not before VCC
All 3 cases above might prevent the modem from recognizing 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.
If you are doubt, please
Use the mains power adapter that is provided by your distributor and is know
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.
There are two ways to switch off (power down) the modem as described below:
use the “AT^SMSO” command
EMERG_OFF to high level for t < 1s
A delay of up to 10s is experienced as the modem logs off the network
3.3 Operating states / LEDs
3.3.1 Power up LED (green LED in the middle)
The modem has a green power up LED, as depicted below, which is used to indicate
various operating states. These states are described in following table.
4 Power consumption
The following table shows you the power consumption of the CT63 / in different
modes:
Please read the information in this section and the information in “Installation
of the Modem”, before starting your integration work!
4.1 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 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, refuelling 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 20cm 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.
4.2 General precautions
The CT63 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 “Technical Data”.
Avoid exposing the modem to lighted cigarettes, naked flames or to extreme
hot or cold temperature.
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 Terminal must not be installed or located where the surface
temperature of the plastic case may exceed 85°C.
All cables connected to the CT63 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 Terminal, does not exceed 3 metres.
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 Terminal.
Note: CEP AG may refuse warranty claims where evidence of product misuse is
found.
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.
4.4 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.
5 Installation of the modem
This chapter gives you advice and helpful hints on how to integrate the CT63
Terminal into your application from a hardware perspective. Please read the
information given in “Safety and Product Care”, page 10 and then read the
information in this section before starting your integration work.
There are several conditions which need to be taken into consideration when
designing your application as they might affect the modem and its function. They are:
5.1.1 Environmental conditions
The modem must be installed so that the environmental conditions stated in the
Technical Data chapter, such as temperature, humidity and vibration are satisfied.
Additionally, the electrical specifications in the Technical Data section must not be
exceeded.
5.1.2 GSM Signal strength
The modem has to be placed in a way that ensures sufficient GSM signal strength.
To improve signal strength, the antenna can be moved to another position. Signal
strength may depend on how close the modem is to a radio base station. You must
ensure that the location, at which you intend to use the modem, is within the network
coverage area. Degradation in signal strength can be the result of a disturbance from
another source, for example an electronic device in the immediate vicinity. More
information about possible communication disturbances can be found in section 5.3.5.
When an application is completed, you can verify signal strength by issuing the AT
command AT+CSQ. See “AT + CSQ Signal Strength”.
Tip! Before installing the modem, use an ordinary mobile telephone to check a
possible location for it. In determining the location for the modem and antenna, you
should consider signal strength as well as cable length
5.1.3 Connections of components to CT63 Terminal
The integrator is responsible for the final integrated system. Incorrectly designed or
installed, external components may cause radiation limits to be exceeded. For
instance, improperly made connections or improperly installed antennas can disturb
the network and lead to malfunctions in the modem or equipment.
5.1.4 Network and Subscription
Before your application is used, you must ensure that your chosen network provides
the necessary telecommunication services. Contact your service provider to obtain
the necessary information.
If you intend to use SMS in the application, ensure this is included in your
(voice) subscription.
Consider the choice of the supplementary services
Use a high-quality power supply cable with low resistance. This ensures that
the voltages at the connector pins are within the allowed range, even during
the maximum peak current.
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. This protects the power cabling
and modem.
5.2.2 Securing the modem
Before securing the modem take into account the amount of additional space
required for the mating connectors and cables that will be used in the application.
Where access is restricted, it may be easier to connect all the cables to the
modem prior to securing it in the application.
Securely attach the CT63 Terminal modem to the host application using two
3mm diameter pan-head screws
5.3 Antenna
5.3.1 General
The antenna is the component in your system that maintains the radio link between
the network and the modem. Since the antenna transmits and receives
electromagnetic energy, its efficient function will depend on:
• the type of antenna (for example, circular or directional);
• the placement of the antenna;
• Communication disturbances in the vicinity in which the antenna operates.
In the sections below, issues concerning antenna type, antenna placement, antenna
cable, and possible communication disturbances are addressed. In any event, you
should contact your local antenna manufacturer for additional information concerning
antenna type, cables, connectors, antenna placement, and the surrounding area.
You should also determine whether the antenna needs to be grounded or not. Your
local antenna manufacturer might be able to design a special antenna suitable for the
application.
Make sure that you choose the right type of antenna for the modem. Consider the
following requirements:
the antenna must be designed for the one of the frequency bands in use;
please ask your network provider for more information:
o GSM 850/900 MHz
o GSM 1800/1900 MHz;
the impedance of the antenna and antenna cable must be 50Ω;
the antenna output-power handling must be a minimum of 2W;
the VSWR value should be less than 3:1 to avoid any damage to the modem.
5.3.3 Antenna placement
The antenna should be placed away from electronic devices or other antennas. The
recommended minimum distance between adjacent antennas, operating in a similar
radio frequency band, is at least 50cm. Therefore we recommend to use a cable
antenna and place it away from the terminal. If signal strength is weak, it is useful to
face a directional antenna at the closest radio base station. This can increase the
strength of the signal received by the modem. The modem‟s peak output power can
reach 2W. RF field strength varies with antenna type and distance. At 10cm from the
antenna the field strength may be up to 70V/m and at 1m it will have reduced to 7V/m.
In general, CE-marked products for residential and commercial areas, and light
industry can withstand a minimum of 3V/m.
5.3.4 The antenna cable
Use 50Ω impedance low-loss cable and high-quality 50Ω impedance connectors
(frequency range up to 2GHz) to avoid RF losses. Ensure that the antenna cable is
as short as possible. The Voltage Standing-Wave Ratio (VSWR) may depend on the
effectiveness of the antenna, cable and connectors. In addition, if you use an adapter
between the antenna cable and the antenna connector, it is crucial that the antenna
cable is a high-quality, low-loss cable. Minimize the use of extension cables,
connectors and adapters. Each additional cable, connector or adapter causes a loss
of signal power.
Possible communication disturbances include the following:
Noise can be caused by electronic devices and radio transmitters.
Path-loss occurs as the strength of the received signal steadily decreases in
proportion to the distance from the transmitter.
Shadowing is a form of environmental attenuation of radio signals caused by
hills, buildings, trees or even vehicles. This can be a particular problem inside
buildings, especially if the walls are thick and reinforced.
Multi-path fading is a sudden decrease or increase in the signal strength.
This is the result of interference caused when direct and reflected signals
reach the antenna simultaneously. Surfaces such as buildings, streets,
vehicles, etc., can reflect signals.
Hand-over occurs as you move from one cell to another in the GSM network.
Your mobile application call is transferred from one cell to the next. Hand-over
can briefly interfere with communication and may cause a delay, or at worst, a
disruption.
6 Optional variants
Optional varians are available, please find below the technical information for:
I2C/SPI on 15-pin connector
JAVA variant
Audio variant
USB host powered version
EDGE variant
Please contact your distributor or CEP AG directly for further information if necessary.
To contact customer support please use the contact details below:
Customer Support
CEP AG
Raiffeisenallee 12b
82041 Oberhaching
Germany
E-mail: support@cepag.de
or
Tel. +49-89-450 292 – 11
Information about CEP AG, products and accessories is available on the following
web site: http://www.cepag.de.
Please contact us via e-mail if you miss anything on the web and we will provide it to
you personally via e-mail.
Note: 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.