NAVTELECOM SMART S-2422 User manual

GPS/GLONASS TRACKING EQUIPMENT
SMART S-2422
Operations manual
Installation and connection of the device
v1.0
MOSCOW
2020

Dear customer!
This Operations manual provides information about main issues relating to the functioning, installation, and operation
of the device.
Customers are strongly advised to study this document carefully before the installation and operation of the device.
Navtelecom LLC is interested in constantly improvement of the manufactured products quality.
Please, contact our technical support by email address: [email protected] should you have any questions or
problems with the device.
It is possible to download software, documentation and get detailed information on the manufacturer's website
https://navtelecom.ru.en
We thank you for purchasing of our product! We are sure that if operation of the equipment is correct, it will reliably
serve you for a long time.

CONTENTS
CONTENTS ........................................................................................................................................... 2
1. BASIC CHARACTERISTICS ............................................................................................................ 3
1.1 Purpose of the system ............................................................................................................. 3
1.2 System tasks............................................................................................................................ 3
1.3 Operational principles ............................................................................................................. 3
1.4 Basic technical characteristics ................................................................................................ 4
1.5 Appearance of the device ........................................................................................................ 6
1.6 Standard equipment set .......................................................................................................... 7
1.7. Device components ................................................................................................................ 9
1.8 Device interface connector.................................................................................................... 11
2. DEVICE CONNECTION ................................................................................................................. 12
2.1 Installation ............................................................................................................................ 12
2.2 SIM-card installation and operation ..................................................................................... 13
2.3 Power connection .................................................................................................................. 13
2.4 Universal inputs connection .................................................................................................. 14
2.4.1 Analog sensors connection.............................................................................................. 14
2.4.2 Discrete sensors connection ........................................................................................... 14
2.4.3 Pulse frequency sensors connection ............................................................................... 15
2.5 Built-in accelerometer ........................................................................................................... 16
2.6 Control outputs connection ................................................................................................... 16
2.7 1-Wire informational interface (IButton) connection........................................................... 19
2.8 Connection to the RS-485 interface ...................................................................................... 21
3. LED INDICATION......................................................................................................................... 22

1. BASIC CHARACTERISTICS
1.1 Purpose of the system
The equipment is a GPS-GSM Based Vehicle Tracking System. It is allowed to use the following terms in relation to this
device: “system”, “product”, “equipment”, “device” “terminal”, “tracker”.
The system is designed for:
vehicle monitoring: its location, track, mileage, fuel consumption, engine hours;
driving style determination (EcoDriving);
emergency informing about vehicle hijacking;
emergency informing about attacks on the driver or passengers and other accidents;
processing and transmitting of data to the server from devices such CAN bus adapters, RFID tag reader, fuel level
sensors;
monitoring the temperature using temperature sensors;
remote control of connected devices and vehicle systems, such as a siren, engine and door lock system, etc.
Recipients of information from the system can be:
centralized dispatch centers;
end-users (corporate and private car owners, proxy persons, etc.)
1.2 System tasks
The system operation consists of the following tasks:
telemetering record of vehicle location, speed, direction and mileage according to the GPS/GLONASS satellite
information;
telemetering record from the contact, impulse, analog connected sensors and CAN bus; monitoring of vehicle
battery voltage;
fuel consumption, drains and fills monitoring; mileage monitoring; stoppage time and off-track monitoring; places
of cargo loading/unloading monitoring;
events data record to the nonvolatile memory, possibility of its remote reading and analyzing;
sustained or specified time period transmission of information about current and past events on the vehicle via
GPRS-channel to the telematics server for further analyzing, visualization and report formation;
customer SMS informing on sensors activation;
connected external devices control (for example, siren on/off) by SMS command or by preset settings in automatic
mode;
control of cargo safety by comprehensive measures; improving driver and passenger’s safety.
1.3 Operational principles
The device during its operation continuously monitors the status of the connected sensors, vehicle battery voltage,
GSM modem signal level, operational capability of navigational sensor (GPS/GLONASS), etc.
At power-up or USB connection to a computer the device automatically turns on. At power-off or USB disconnection
the device turns off.
Upon the occurrence of an event set by the device logic (set by the user or device manufacturer), the telematics
information is recorded into nonvolatile memory and is sent to tracking platform as a message with a set of parameters.
Events for messages formation can be change of direction, timer activation in motion or in stand, activation of input sensor,
value changes of analog or digital sensor, etc. Each message is recorded with its sequence number and has its own code
that determines the reason for its formation. When sending message packets after reconnecting to tracking platform, the
earlier messages are sent first. Some messages generated by “alarm” events (pressing the panic button, impact sensor
detection, etc.) are sent out of turn, immediately after the “alarm” event has happened. After message packet sending to
the server, the device is waiting for server answering. If there is no answering from the server, the device will try to send
message again until it receives answering about data transferred, in this case the next packets from the queue will not be
sent. This algorithm set in the data transfer protocol ensures reliable sending of all messages to the server, even in case
of data transmitting failure.
The device operation parameters are configured using proprietary software, the NTC Configurator program. For
proper software operation there is a requirement for a computer with MS Windows 7 or higher operating system.
It is also possible to perform basic settings via Bluetooth, USB, GSM channels using the NTC Control program - a
mobile application for smartphones and tablets running the Android operating system.

1.4 Basic technical characteristics
Tab 1
S-2422
GSM/GPRS/Bluetooth
GSM frequency bands
GSM 850, EGSM 900, DCS 1800, PCS
1900
GPRS class
B, multislot class 12
Transmitter power
Class 4 (2W) в GSM 850 и EGSM 900;
Class 1 (1W) в DCS 1800 и PCS 1900
Maximum speed of data transfer/reception, kbit/s
85,6
SIM card holder 1
external with the plug, miniSIM
SIM card holder 2
no
GSM-signal jammer detector
yes
Bluetooth
yes, v 4.0
GNSS
Supported navigation systems
GLONASS/GPS/Galileo/QZSS
Number of channels
tracking: 33, Figureking-up: 99
Sensitivity (in laboratory conditions)
tracking: -167 dBm
cold start: -149 dBm
Time of first coordinates determination (for GPS and GLONASS systems with
a signal of -130 dBm)
cold start: 29 sec
warm start: 22 sec
hot start: <1 sec
Coordinates error, (50% CEP, 24 hours in static mode, with
signal levels -130 dBm), m
2.5 (in plan), 5 (in height)
Coordinate update rate, Hz
1
GNSS jammer detector
yes
Power supply
Operation supply voltage, V1
9,5…47
Current consumption at 12 V voltage in operation mode on
Average2, mA
80
Current consumption at 12 V voltage with turned off
GLONASS and GSM modules is no more than, mA
20
Maximum current consumption at 12 V voltage in the operation with the
charge of the battery is not more than, mA
200
Protection against polarity reversal
yes
Protection against prolonged overvoltage up to 500 V
yes
Battery3
no
Battery protection from recharge, full discharge, short circuit4
no
Quartz crystal unit
no
Backup battery of the navigation module
yes
Time of keeping of the RTC clock rate and ephemeris in a navigation module
(with the power off and discharging of the battery) is at least, days
5
Battery charging from USB
no
Interfaces/sensors
Inputs against power surges, V
up to 200
Total number of universal (analog, discrete, pulse-frequency) inputs
3
Built-in pull-up resistor for discrete or pulse-frequency inputs
no
Measuring range by inputs, set up as analog, V
0…31
Working range with frequency fuel level sensors, Hz
1 - 3000
USB interface for settings, control, data transfer and diagnostics
yes
RS-485 digital interface
yes
RS-232 digital interface
no

1-Wire interface
yes
Number of outputs of the “open collector” type for the external devices
control
2
Maximum switching current by the control outputs, mA
500
Maximum switching voltage by the control outputs, V
48
Built-in 3-axis accelerometer
yes
Maximum impact loading measured by the device, g
8
Performance specifications
Enclosure protection level
IP54
Maximum allowable overload during impacts, g
24
Storage temperature with the battery5,oC
-
Storage temperature without the battery, oC
-40 … +85
Operating temperature with the battery, oC
-
Operating temperature without the battery, oC
-40 … +85
Temperature at which the battery is possible to charge, oC
-
Maximum allowable humidity level at 35 oC, %
95
Device dimensions with connectors, mm
102х57х22
Device weight, kg
0,070
1.
If maximum operating voltage is exceeded the power protection is activated. The device continues to work, but is
powered by the battery.
2.
If GPRS operates in poor communications, peak consumption (10 ms), consumption of the device can accede 500 mA.
3.
Attention! Lithium polymer battery (Li-Po) is used in the device. The following rules must be observed during its
operation: not to heat, keep away from sources of heat, not to throw the battery into the fire, not to expose to direct
sunlight. The device, for power of which Li-Po battery is used, cannot be used in high humidity, high and low ambient
temperatures. Operation is permitted under the conditions specified by the manufacturer. Not to hit, not to deform,
not to disassemble, not to close contacts.
4.
Protection against battery charge while it is overcooled or overheated.
5.
When the device is stored and used outside the specified temperatures, it is recommended to turn it off and remove
the battery from the device to avoid damage to the battery and to the device.

1.5 Appearance of the device
On the front part of the device unit (Figure 1) is located:
14-pin connector of Microfit-14 type for connection of power supply, digital and analog sensors and control lines.
On the side of the device unit (Figure 2) is located:
MiniUSB connector for connection with a computer;
SIM card holder slot with ejector (yellow button).
In the upper part of the device unit (Figure 3) there are three indicators:
system indicator (SYS)
modem operation indicator (GSM);
navigation receiver indicator (NAV).
Figure 1. Device unit (front view).
14-pin connector of Microfit-14
Figure 2. Device unit (side view).
MiniUSB connector and SIM card slot with ejector
Figure 3. Device unit (top view).
SYS, GSM, NAV indicators

1.6 Standard equipment set
Tab. 2
№
Name
Number of pieces
Version of complete set
A
B
1
Device unit
1
+
+
2
14-pin connector of Microfit-14 with two power wires
1
+
+
3
Cable set of 5 installation wires
1
+
+
4
Interface cable with MiniUSB connector
1
+
5
Passport
1
+
+
6
Package
1
+
Figure 4. 14-pin connector of Microfit-14
Figure 5. Interface cable with MiniUSB connector
Some cases may require connection of additional equipment not included in the standard equipment set, for example:
fuse and fuse holder;
fuel level sensor;
external LED;
temperature sensor;
TouchMemory contact key reader.
Figure 6. Fuse and fuse holder

Figure 7. Fuel level sensor
Figure 8. External LED
Figure 9. Temperature sensor
Figure 10. TouchMemory contact key reader
The manufacturer reserves the right to complete the devices with equipment whose set, appearance and
characteristics differ from those shown in the figures.

1.7. Device components
The device consists of the following elements (see figures 11-14):
1) front cover;
2) fixing hole;
3) system LED indicator;
4) GSM LED indicator;
5) GLONASS / GPS LED indicator;
6) 14 pin connector;
7) MiniUSB connector;
8) SIM-card 1 ejector holder;
9) SIM-card holder 1 (external);
10) back cover;
11) fixing screw of the back cover - 4 pcs.
Figure 11
Figure 12

Figure 13
Figure 14

1.8 Device interface connector
14
7
13
6
12
5
11
4
10
3
9 8
2 1
NC RS485A(+) RS485B(-) iBUT NC NC
OUT2 OUT1
UIN3 UIN2 UIN1
GND
+Ug
NC
Figure 15. System 14-pin interface connector
1 - Power “Plus” (+ UG)
2 –“Ground” (GND)
3 - Universal input 1 (UIN1)
4 - Universal input 2 (UIN2)
5 - Universal input 3 (UIN3)
6 –Output 1 "open collector" (OUT1)
7 –Output 2 "open collector" (OUT2)
8 –Not used
9 –Not used
10 - 1-Wire Interface Line (iBUT)
11 - RS-485 interface line (RS-485B (-))
12 - RS-485 interface line (RS-485A (+))
13 –Not used
14 –Not used
“Plus” of the main power supple +U6 should be connected via an external fuse.
«Ground» GND is connected to the "ground" of the car.
The universal inputs UIN1, UIN2 иUIN3 can be set up as discrete, analog, counting or frequency. It allows to
connect to them a wide range of different sensors, for example, frequency (frequency from 1 Hz to 2000 Hz) and analog
(voltage from 0 V to 31 V) FLS, impulse fuel consumption sensors (DRL), buttons or switches.
Attention!
It is prohibited to apply a voltage more than 50 V to the device universal inputs, because it may lead to the failure
of the device.
Outputs OUT1 and OUT2«open collector» type are designed to control low-current loads up to 500 mA. When
activated, a negative signal ("Ground") is formed on these lines. Connection of external executive devices with a load
current higher than the maximum allowed should be made using additional switching relays. The relay type is selected
based on the requirements for the value of the switched current, voltage, and also depending on the power of the connected
device.
The interface line 1-Wire (iBUT) is used to connect the contact pads of TouchMemory keys, Proximity-card readers
and digital heat-sensing device.
The digital interface RS-485 is designed for connection of various devices transmitting and receiving information
on this interface, for example, fuel level sensors (up to 6 pcs.), CAN bus adapter, RFID.

2. DEVICE CONNECTION
2.1 Installation
Before the system installation, first of all, it is necessary to determine the type and number of the connecting sensors,
the identification system and other additional equipment. It is also necessary to be sure that all the additional equipment
connected to the terminal are operable.
The device has internal sensitive GSM and GLONASS/GPS antennas, however, just before system installation and
equipment connection it is necessary to be sure that at the proposed location, the selected cellular operator provides
satisfactory communication quality.
The device should be installed in such a way as to ensure maximum “visibility” of the navigation satellites in the
upper hemisphere. The device must be oriented in space so that the internal GLONASS/GPS antenna is on top. That is,
when the device is placed vertically, the Microfit-14 interface connector should be located on the bottom, and on the
horizontal position, the SYS, GSM and NAV indicators should be on the top.
Attention!
In order to avoid overheating of the device it is recommended to install the tracker in places with an ambient
temperature more than +60 ° C, for example, near heating systems, etc. It is also prohibited to place the device in a sealed
container without heat dissipation.
It is prohibited to install tracker in places with high humidity and in places where there is a risk of possible ingress
of liquid or large amount of dust into the case.
Figure 16. Device unit. Location of GLONASS/GPS-antenna
When the device is connected to the Microfit-14 connector harness, the connector itself should not be connected to
the device. Each pin of this connector has a numeric code. The purpose of each pin on the Microfit-14 system connector is
shown in Figure 16
At the stage of checking the correctness of the connection and settings of the device, it is not recommended to
directly include actuating devices in the output circuits. It is advisable to do this at the final stage of verification.
The power supply of digital and analogue fuel sensors must be connected through the fuses supplied with the sensors
directly to the power supply.
The power supply “-” (“ground”) of all connected external sensors must be combined with the power supply “-”
(contact “G”) of the device.
The interface lines of fuel sensors should be connected directly to the device without additional elements. Switches
must be made with the power off.
Connection to the car CAN bus should be carried out with the car ignition off.

2.2 SIM-card installation and operation
The device supports using of one SIM-card. The SIM card (external) installation is carried out without the use of special
tools.
Figure 17. SIM-card installation to the device
Remove the SIM card holder from the device by pressing the yellow ejector button with a pen or a pencil. Place the SIM
card in the holder with the gold contacts facing out. Carefully insert the holder along with the SIM card back into the device.
Attention!
If the SIM-card is locked with a PIN code, it is necessary to unlock it by inserting the SIM card into a mobile phone or
specify the PIN-code of this card in the device settings in the “Data transmission” tab.
The balance of funds on SIM-cards should be sufficient for the device to operate on GPRS.
2.3 Power connection
The power supply of the system is carried out from the on-board network of the car, which should within the limits
indicated in Table 1, in the section "Basic technical characteristics".
When voltage surges, which is more than the specified ratings, occur, the built-in overvoltage protection system will
operate in the device. It is strongly recommended to connect the device to the power supply through a 1 A fuse (not
included in standard equipment set). During installation the power supply should be connected the last turn when all the
other equipment is already connected. Connection of the power supply minus contact (GND) is carried out to the vehicle
“ground”.
Note:
On vehicles with disconnection of the “ground” in order to ensure uninterrupted operation, it is allowed to connect
the device power supply to the “+” and “-” circuits of the vehicle battery. In this case, it is not allowed to connect any
sensors, signal circuits or power supply circuits through which the device can be connected to the car body. Also, when the
car is powered by the battery in which the “ground” is disconnected, sensors cannot be connected to the device, the “-”
power supply of which is connected to the car body, without the use of galvanic isolation devices.
14
7
13
6
12
5
11
4
10
3
9 8
2 1
«+»
«-»
Car battery
Fuse
(1А)
«GND»
Figure 18. Power connection

2.4 Universal inputs connection
2.4.1 Analog sensors connection
The device allows to measure the voltage applied to the inputs in the range of 0 ... 31 V.
When connecting analog FLS or other sensors for which the output voltage has to be monitored, the voltage
measurement profile must be set in the inputs setting. In this case, the function of adjustable averaging of measured values
and the setting of the threshold level for fixing the voltage measurement event become available.
CPU_adc
R1R2
UIN
C1
+U
Figure 19. Connection of analog sensors
2.4.2 Discrete sensors connection
The device allows to connect any type of sensors that have two steady states: "on" ("activated") and "off" ("normal").
The voltage thresholds at which the device fixes the sensor on (activating) or off (switching to normal) depend on
the line profile setting and the set levels on the voltage scale. In order to operate with discrete sensors, the “Discrete NO
+”, “Discrete NC +”.
CPU_adc
R1R2
UIN
C1
2–10
кОм
+U
Figure 20. Connection of normally open (NO-) sensors
2–10
кОм
+U
CPU_adc
R1R2
UIN
C1
Figure 21. Connection of normally closed (NC-) sensors

Profiles "Discrete NC+" and "Discrete NO+" allow to work with sensors, which, when turned on or off, close the input
to “+” supply voltage.
CPU_adc
R1R2
UIN
C1
+U
Figure 22. Connection of normally open (NO+) sensors
CPU_adc
R1R2
UIN
C1
+U
Figure 23. Connection of normally closed (NC+) sensors
Note:
It is recommended to connect one of the universal input (usually UIN1) to the vehicle ignition line and make the
appropriate setting in the configuration. However, such connection is not mandatory.
In addition to the source of notifications about turning on and turning off events, the input is used in coordinate
processing algorithms (for example, when they are averaged at parking lots), energy saving, when calculating engine hours
and in some other device algorithms.
Any input which configured for operation with a discrete sensor can be used as an ignition.
14
7
13
6
12
5
11
4
10
3
9 8
2 1 Fuse
(1А)
+U
Ignition
switch
UIN1
Alarm
button
«GND»
«GND»
«+»
«-»
Car battery
Figure 24. Connection of the ignition lock and alarm button
Digital inputs are configured in the “Input lines” tab of the NTC Configurator program.
2.4.3 Pulse frequency sensors connection
Сonnecting frequency or pulse sensors, it is necessary to consider how the output signal is generated in these
sensors. Further setting of the input depends on this.
It is necessary to set the threshold level of fixation correctly, in order the device correctly determine the frequency

or calculate the pulses.
The connection diagram or frequency sensors, the output of which is implemented according to the “open collector”
(OC) circuit with pull-up resistor is as follows:
CPU_adc
R1R2
UIN
C1
Q2
Rp
+U
Figure 25. Connection of sensors with an “OC” type output circuit with a pull-up resistor in the sensor
When pulse flow meters with a reed sensor is connected, one contact of which is connected to the “ground”, it is
necessary to use an external pull-up resistor.
CPU_adc
R1R2
UIN
C1
2–10
кОм
+U
Figure 26. Connection of flow meter with a reed sensor
2.5 Built-in accelerometer
There are virtual sensors based on the built-in accelerometer (three-axis acceleration sensor): soft and strong impact
sensors, displacement sensor and tilt sensor in the device. They can be used for alerts as well as external lines.
Accelerometer is also involved in the coordinate averaging algorithm during stops, and the correct display of the track
depends on its settings. In addition to virtual sensors, accelerometer is used for such functions as EcoDriving. For proper
operation of these functions, the accelerometer must be calibrated after installing the device on the vehicle.
2.6 Control outputs connection
OUT1 and OUT2 open collector outputs are designed to control low-current loads up to 500 mA. When the output is
activated (turned on), it connects the external load to the "-" power supply (to the "ground").
The character of the controlling signal depending on the chosen mode can be permanent, signal or periodic.
Settings of the outputs are made in the “Output lines” tab of the NTC Configurator program.
One of the outputs can be used for control of sound signal emitting with help of the buzzer, for warning or EcoDriving
function indication and for reminding about TM-key attaching (or RFID card).
Buzzers may be different in operating voltage, in the presence or absence of a built-in generator. A buzzer with a
built-in generator can emit a sound signal independently when a constant supply voltage is applied.
In order buzzer operates without built-in generator, supply voltage modulation is required.

Buzzer without built-in generator can be connected only to OUT1, because only this line has opportunity to modulate
the control signal for the buzzer.
Buzzer with built-in generator can be connected to any output. Connection diagrams for buzzer with build-in
generator and for buzzer without build-in generator have no difference.
14
7
13
6
12
5
11
4
10
3
9 8
2 1 Fuse
(1А)
«GND»
«+»
«-»
Car battery
Buzzer
-
+
Figure 27. Connection diagram of buzzer
It is possible to connect LED for indication of device operation mode and security mode state.
If the power source is vehicle’s on-board network, the LED must be connected through current-limiting resistor. Such
resistor is already installed inside the lamp in the automotive LED lamps. It is only necessary to select the LED lamp under
the desired voltage of the on-board vehicle network.
14
7
13
6
12
5
11
4
10
3
9 8
2 1 Fuse
(1А)
«GND»
«+»
«-»
Car battery
1-2 kOhm
+
-
LED
Figure 28. Connection diagram of LED
When security functions are used, it is possible to control the car siren. If the siren has a separate input, controlled
by “-”, then the output of the terminal can be connected to this input directly.
14
7
13
6
12
5
11
4
10
3
9 8
2 1 Fuse
(1А)
«GND»
«+»
«-»
Car battery
+
-
IN
Siren
Figure 29. Connection diagram for car siren with control input by “-”.

In order to connect car sirens without an additional control input, the inclusion of which is carried out by applying
the supply voltage, it is necessary to use an additional relay, since the current consumed by such a siren may exceed the
maximum allowable value for the output of the device.
The use of an additional relay is necessary for any load that can consume more than 500 mA.
There are relays with four and five contacts, but all relays have winding contacts (control contacts), these are 85
and 86 contacts (Figure 30). One of these contacts is connected to the “+” of the power supply, and the second to any
negative control output of the device (contacts 6 and 7 of the Microfit-14 connector). All connections must be made through
the fuse.
Figure 30. Designation of the external relay contacts
When voltage is applied to control contacts, relay is activated and closes or opens the electrical circuit with power
contacts. Power contacts are always marked as 30, 87 and 87a. The 30th pin is always in the relay. Without applying
voltage to the winding contacts, it is permanently closed to contact 87a. If a signal is applied to the winding, then the 30th
contact is disconnected from 87a and connected to 87. 87a or 87 contacts may be absent, then the relay will only work to
turn on or off (closing-opening) the power circuit.
30
85 86
87a
87
Figure 31. Five-contact relay diagram
Such relay can be used for example, when connecting an automotive electromechanical lock (figure 32).
Attention!
When controlling the inductive load, which is the winding of the relay, reverse currents with a potential of more than
200 V can occur. Such a voltage can destroy the control transistor of the device output. To limit backflow emissions, it is
necessary to connect an additional 1N4007 diode (1A, 1000V) in parallel to the relay coil, as indicated in figure 32
At the stage of correctness verification of the connection and settings of the device, it is not recommended to include
actuators in the relay circuit directly. It is advisable to do this at the final stage of testing.

30
85 86
87a
87
14
7
13
6
12
5
11
4
10
3
9 8
2 1 Fuse
(1A)
«GND»
«+»
«-»
Car battery
Diode 1N4007
Fuse
External
device
+
-
«GND»
Figure 32. Connection diagram of the relay to the outputs of the device OUT1 and OUT2
2.7 1-Wire informational interface (IButton) connection
1-Wire controller interface (IButton) allows to connect up to 4 digital sensors like DS18S20 (DS18B20) to the device,
and it can also operate with DS1990 keys or key / card readers that emulate DS1990 keys via interface 1- Wire.
Each DS1990 key is a chip with a unique identification number stitched into it at the manufacturing plant by which
the device identifies this sensor.
Saving the key codes in the device’s memory allows to use identification when changing the security mode, activating
the output with the profile set: “TM registered key indicator” and “TM key indicator”, and also necessary for operation of
the “Immobilizer” function.
The maximum number of stored keys - 16.
It is also allowed to connect external readers of contactless Proximity-cards and keyfobs that have TouchMemory
DS1990A key emulation interface. However, such readers, as a rule, do not operate together with thermal sensors
connected to the same physical interface.
Figure 33. TouchMemory System Key
Figure 34. TouchMemory key contact reader
Figure 35. Temperature sensor based on DS18S20 chip