Cinterion MTX-65i-RS485LC User manual

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MTX-65i-RS485LC
TERMINAL
User Manual
Powered by Cinterion WM TC65i GSM-GPRS Wireless Module

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General Notes
Product is deemed accepted by recipient and is provided without interface to recipient’s products. The documentation and/or
product are provided for testing, evaluation, integration and information purposes. The documentation and/or product are provided
on an “as is” basis only and may contain deficiencies or inadequacies. The documentation and/or product are provided without
warranty of any kind, express or implied. To the maximum extent permitted by applicable law, Matrix Electronica further disclaims
all warranties; including without limitation any implied warranties of merchantability, completeness, fitness for a particular purpose
and non-infringement of third-party rights. The entire risk arising out of the use or performance of the product and documentation
remains with recipient. This product is not intended for use in life support appliances, devices or systems where a malfunction of
the product can reasonably be expected to result in personal injury. Applications incorporating the described product must be
designed to be in accordance with the technical specifications provided in these guidelines. Failure to comply with any of the
required procedures can result in malfunctions or serious discrepancies in results.
Furthermore, all safety instructions regarding the use of mobile technical systems, including GSM products, which also apply to
cellular phones, must be followed. Matrix Electronica or its suppliers shall, regardless of any legal theory upon which the claim is
based, not be liable for any consequential, incidental, direct, indirect, punitive or other damages whatsoever (including, without
limitation, damages for loss of business profits, business interruption, loss of business information or data, or other pecuniary loss)
arising out the use of or inability to use the documentation and/or product, even if Matrix Electronica has been advised of the
possibility of such damages. The foregoing limitations of liability shall not apply in case of mandatory liability, e.g. under the
Spanish Product Liability Act, in case of intent, gross negligence, injury of life, body or health, or breach of a condition which goes
to the root of the contract. However, claims for damages arising from a breach of a condition, which goes to the root of the
contract, shall be limited to the foreseeable damage, which is intrinsic to the contract, unless caused by intent or gross negligence
or based on liability for injury of life, body or health. The above provision does not imply a change on the burden of proof to the
detriment of the recipient. Subject to change without notice at any time. The interpretation of this general note shall be governed
and construed according to Spanish law without reference to any other substantive law.
Important information
This technical description contains important information for start up and use of the MTX-65i-RS485-LC
Terminal.
Read it carefully before you start working with the MTX-65i-RS485-LC 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.
Service and Support
To contact customer support please use the contact details below:
Matrix Electronica
Alejandro Sanchez, 109
28019 Madrid –Spain-
[email protected]
Tel. [phone]
Information about MTX-65i-RS485-LC product and accessories is available on the following web site:
http://www.mtx-terminals.com
Documentation, drivers and tools
ftp.matrix.es/MTX-Terminals
Or contact your local distributor / sales agent:

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REVISION INFORMATION
FIRST EDITION. VERSION 1.0. Release: Apr 2013

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1. INTRODUCTION ...................................................................................................................................................6
1.1 Description ............................................................................................................................. 6
1.2 ORDERING INFORMATION ...................................................................................................... 6
1.3 Highlights ............................................................................................................................... 7
1.4 MTX-65i-RS485-LC Wireless modems in a Communication System .............................................. 9
1.5 Main Features and Services ..................................................................................................... 9
1.5.1 Types of Mobile Station ................................................................................................................................9
1.5.2 Short Message Service................................................................................................................................10
1.5.3 Data............................................................................................................................................................10
1.5.4 GPRS Multi-Slot Support............................................................................................................................11
1.5.5 Power Consumption ...................................................................................................................................11
1.5.5 SIM Card ....................................................................................................................................................13
1.6 Precautions .......................................................................................................................... 13
1.7 Block diagram ....................................................................................................................... 13
2. MECHANICAL DESCRIPTION ........................................................................................................................14
2.1 Overview ............................................................................................................................. 14
2.2. Dimensions ......................................................................................................................... 14
3. ELECTRICAL DESCRIPTION ..........................................................................................................................15
3.1 Power Connector .................................................................................................................. 15
Note. VCC and GND are reverse polarity and overvoltage protected 3.2 Mini USB Connector ............. 15
3.2 Mini USB Connector .............................................................................................................. 16
3.3 GSM Antenna Connector ........................................................................................................ 16
3.4. SIM card reader ................................................................................................................... 17
3.6 MAIN Serial RS232 Interface Port ASC0 ............................................................................... 18
3.7. RS485 BUS .......................................................................................................................... 20
3.7.2. I2C Serial Control Bus ..............................................................................................................................21
3.7.3. SPI Bus ......................................................................................................................................................22
3.7.4. Analog-to-Digital Converter (ADC ...........................................................................................................23
3.7.5 Real Time Clock .........................................................................................................................................23
3.8. Software Updates ................................................................................................................ 23
4. OPERATION.........................................................................................................................................................24
4.1 Switching On the Modem. New “Automatic Restart after shutdown” feature ............................... 24
4.2 Operating States/LED ............................................................................................................ 24
5. EMBEDDED APPLICATIONS...........................................................................................................................26
5.1. MTX-TUNNEL SOFTWARE APPLICATION ..............................................................................................27
6 SAFETY AND PRODUCT CARE........................................................................................................................29
6.1. Safety instructions ............................................................................................................... 29
6.2. General precautions ............................................................................................................. 29
6.3. SIM card precautions ........................................................................................................... 30
6.4. Antenna precautions ............................................................................................................ 30
6.5. Radio Frequency (RF) exposure and SAR ............................................................................... 30
6.6. Personal Medical Devices ...................................................................................................... 31
7. INSTALLATION OF THE MODEM .................................................................................................................32
7.1 Where to install the modem ................................................................................................... 32
7.1.1 Environmental conditions...........................................................................................................................32
7.1.2 Signal strength............................................................................................................................................32
7.1.3 Connections of components to MTX-65i-RS485-LC Terminal ...................................................................32
7.1.4 Network and Subscription ..........................................................................................................................32
7.2 How to install the modem ...................................................................................................... 32
7.2.1 Power supply ..............................................................................................................................................32
7.2.2 Securing the modem ...................................................................................................................................33
7.3 Antenna ............................................................................................................................... 33

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7.3.1 General.......................................................................................................................................................33
7.3.2 Antenna type ...............................................................................................................................................33
7.3.3 Antenna placement .....................................................................................................................................33
7.3.4 The antenna cable.......................................................................................................................................33
7.3.5 Possible communications disturbances ......................................................................................................34
8. ACCESSORIES.....................................................................................................................................................35
8.1. POWER SUPPLY ................................................................................................................... 35
8.1.1 AC Power Adaptor .....................................................................................................................................35
8.1.2 DC cable.....................................................................................................................................................35
8.2. ANTENNAS .......................................................................................................................... 36
8.2.1 GSM Magnetic Dual Band Antenna (900/1800MHz).................................................................................36
8.2.2 GSM Right angle short antenna .................................................................................................................36
8.2.3 GSM Patch Adhesive Antenna....................................................................................................................36
8.3. CABLES ............................................................................................................................... 37
8.3.1 Main port - RS232 4-way Serial Cable......................................................................................................37
8.3.2 USB CABLE................................................................................................................................................38
8.3.3 Adapter DB15 F – DB9 M..........................................................................................................................38
8.4. DIN Mounting Kit........................................................................................................................................38
9, CONFORMITY ASSESSMENT..........................................................................................................................39
FCC COMPLIANT AND SAR INFORMATION..................................................................................................40
10. ROHS STATEMENT..........................................................................................................................................41
11. DISPOSAL OF OLD ELECTRICAL & ELECTRONIC EQUIPMENT (WEEE MARK) .........................41
12. ABBREVIATIONS..............................................................................................................................................42
13. AT COMMAND SUMMARY ............................................................................................................................43
15. SALES CONTACT .............................................................................................................................................51
DEVELOPMENT KITs ................................................................................................................... 51

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1. INTRODUCTION
1.1 Description
The MTX-65i-RS485-LC is an intelligent GPS receiver plus GSM/GPRS radio terminal that encapsulates
everything you need for wireless M2M capability in one compact unit.
The MTX-65i-RS485-LC in conjunction with JAVA SDK software package can host and control your
wireless application, minimizing the need for extra components.
Alternatively, it can be used as a powerful standalone GPRS modem with its intrinsic TCP/IP stack.
The MTX-65i-RS485-LC is a self contained terminal with its own SIM card reader and 1 standard
connector interface, minimizing the need for further hardware development. This terminal can be used as
a powerful and flexible device that can be used in a wide range of telemetry and telematic applications
that rely on the remote exchange of data, voice, SMS or faxes via the GSM cellular network.
The MTX-65i-RS485-LC provides a standard RS232 and RS485 serial communication interface ports, as
well a USB port to allow the connectivity to all relevant PCs and control boards in office and industrial
environments. The MTX-65I-RS485-LC has a wide and useful range of IOs in its main port that can be
reconfigured to add functions and features that make your M2M solution both innovative and cost
effective.
The MTX-65i-RS485-LC can be used to provide a communications link for a variety of wireless
applications including fleet and asset management, vending, security/alarm monitoring, e-maintenance
and other telemetry applications.
With quad band 900/1800 MHz and 850/1900 MHz, your applications can be used all over the world.
The MTX-65i-RS485-LC incorporates a Cinterion WM TC65i module.
Note! Some of the functions described inside this Technical Description are only possible when the SIM-
Card is inserted
1.2 ORDERING INFORMATION
MTX-65i-RS485-LC: CODE 199801123
Hardware revision: HR 1.02
Firmware revision: FW 1.100

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1.3 Highlights
Interfaces
• GSM FME M antenna connector
• GPS SMA F antenna connector
o 2 Analog Input
o 1 x I2C/SPI bus. SPI optional.
o 1 x 4-wires RS232 UART flow control
o RS485 port
 USB 2.0 port
• GREEN Operating status LEDs
• SIM card interface 3 V, 1.8 V
• Plug-in power supply
General Features
• Quad-Band GSM 850/900/1800/1900 MHz
• GPRS multi-slot class 12
• GSM release 99
• Control via AT commands
• SIM Application Toolkit (release 99)
• TCP/IP stack access via AT commands
• Internet Services: TCP, UDP, HTTP, FTP, SMTP, POP3
• Supply voltage range: 9 ... 28 Vdc
• Power consumption (at 12 V):
- Power down 0.5 mA
- Sleep mode (registered DRX = 6) 29mA.
- Speech mode (average) 360 mA
- GPRS class 12 (average) 600 mA
• Temperature range
- Operation: -20°C to +65°C
-Restricted operation *: -30°C to +85°C
• Dimensions. Excluding connectors: 78.1 x 66.8 x 37.2mm
• Weight: < 190 g
GPRS data transmission
• GPRS class 12
• Mobile station class B
• PBCCH support
• Coding schemes CS 1-4
Multiple simultaneous PDP contexts
CSD data transmission
• Up to 14.4 Kbit/s
• V.110
• Non-transparent mode
• USSD support
Specification for fax
 Group 3, class 1, 2

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Ordering information: MTX-65i-RS485-LC: 199801123
*Restricted operating temperature range allows normal mode speech calls or data transmission for limited time until
automatic thermal shutdown takes effect. The duration of emergency calls is unlimited because automatic thermal
shutdown is deferred until hang up.
Short Message Service (SMS) Features
• Point-to-point MO and MT
• SMS cell broadcast
• Text and PDU mode
Internet Protocols
TCP/UDP/IP protocol stack
Extensive AT command access to TCP/IP stack
Internet Services: TCP, UDP, HTTP, FTP, SMTP, POP3
Open application resources
ARM© Core, Blackfin© DSP
• Memory: 400 KB (RAM) and 1.2 MB (Flash)
• Improved power-saving modes
Java™ features:
• CLDC 1.1 Hl
• J2ME™ profile IMP-NG
• Secure data transmission with HTTPS, SSL and PKI
Over-the-air update
• Application SW: OTAP
• Firmware: FOTA (OMA compliant)

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1.4 MTX-65i-RS485-LC Wireless modems in a Communication System
Figure 1 and Figure 2 illustrate the main blocks of a wireless communication system using the wireless
modem. Figure 1 shows the communication system when a micro-controller is used. They also show the
communication principles of the system and the interface between the wireless modem and the
application and Figure 2 shows the communication system when the JAVA application is embedded on
the wireless modem. The definitions in the figures, as used elsewhere in this manual, are in accordance
with the recommendations of 3GPP TS 27.007.
The MS (mobile station) represents the wireless modem and SIM card. The wireless modem excluding
SIM card, is known as the ME (mobile equipment).
The DTE (data terminal equipment) is the controlling application. This can be either an external host or
an internal embedded application.
The DCE (data circuit terminating equipment) is the serial communication interface of the MS.
1.5 Main Features and Services
The MTX-65i-RS485-LC performs a set of telecom services (TS) according to GSM standard phase 2+,
ETSI and ITU-T. The services and functions of the MTX-65i-RS485-LC are implemented by issuing
customized applications embedded onto the device, by AT commands issued internally or over the RS232
serial interface.
1.5.1 Types of Mobile Station
The MTX-65i-RS485-LC is a fully Quad Band capable GSM/GPRS mobile station with the characteristics shown
in the table below.
Figure 1. Main Blocks in a Wireless System (external micro-controller) Figure 2. Main Blocks in a Wireless System (embedded application)

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1.5.2 Short Message Service
The wireless modem supports the following SMS services:
• Sending; MO (mobile-originated) with both PDU (protocol data unit) and text mode supported.
• Receiving; MT (mobile-terminated) with both PDU and text mode supported.
• CBM (cell broadcast message); a service in which a message is sent to all subscribers located in one or more
specific cells in the GSM network (for example, traffic reports).
• SMS status report according to 3GPP TS 23.40
The maximum length of a text mode SMS message is 160 characters using 7-bit encoding. The wireless
modem supports up to six concatenated messages to extend this function. Concatenation is performed by the
host application.
1.5.3 Data
The wireless modem supports the following data protocols:
• GPRS (General Packet Radio Service)
The wireless modem is a Class B terminal. The wireless modem is GPRS multi-slot class12 enabled,
capable of receiving at a maximum of four timeslots per frame (down link), and transmitting in two
timeslots per frame (up link). See section 1.5.4 for multi-slot allocation by class.
• CSD (Circuit Switched Data)
The MTX-65i-RS485-LC wireless modem is capable of establishing CSD communication at 9.6 kbps and
14.4 kbps over the air.
Feature GSM850 E-GSM900 GSM1800 GSM1900
Frequency
range (MHz)
Tx 824-849 880-915 1710-1785 1850-1910
Rx 869-894 925-960 1805-1880 1930-1990
RF power @ARP with
50 load (typ) 33dBm 33dBm 30dBm 30dBm
Channel spacing 200kHz 200kHz 200kHz 200kHz
Number of channels 124 174 374 299
Number of TD slots 8 8 8 8
Duplex spacing 45MHz 45MHz 95MHz 80MHz
GSM power class 4 (2W) 4 (2W) 1 (1W) 1 (1W)
Modulation GMSK
Receive sensitivity <-102dBm at antenna connector
GPRS multi-slot class Class 12

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1.5.4 GPRS Multi-Slot Support
GSM Multi-slot classes supported by MTX-65i-RS485-LC
1.5.5 Power Consumption
The table below briefly summarizes the various operating modes referred to in the following chapters.
Normal operation
GSM / GPRS SLEEP
Various power save modes set with AT+CFUN command. Software is active
to minimum extent. If the Terminal was registered to the GSM network in
IDLE mode, it is registered and paging with the BTS in SLEEP mode, too.
Power saving can be chosen at different levels: The NON-CYCLIC SLEEP
mode (AT+CFUN=0) disables the AT interface. The CYCLIC SLEEP modes
AT+CFUN=7 and 9 alternately activate and deactivate the AT interfaces to
allow permanent access to all AT commands.
GSM IDLE Software is active. Once registered to the GSM network paging with BTS is
carried out. The Terminal is ready to send and receive.
GSM TALK
Connection between two subscribers is in progress. Power consumption
depends on network coverage individual settings, such as DTX off/on,
FR/EFR/HR, hopping sequences, antenna.
GPRS IDLE
Terminal is ready for GPRS data transfer, but no data is currently sent or
received. Power consumption depends on network settings and GPRS
configuration (e.g. multi-slot settings).
GPRS DATA
GPRS data transfer in progress. Power consumption depends on network
settings (e.g. power control level), uplink / downlink data rates, GPRS
configuration (e.g. used multi-slot settings) and reduction of maximum
output power.
GPS Transparency GPS transparent mode. The mode is set by AT command.
POWER DOWN
Normal shutdown after sending the AT^SMSO command, after pressing the ON/OFF key or after the
activation of the ONOFF line. The RTC works continuously, but the software is not active. Interfaces are
not accessible.
Airplane mode
Airplane mode shuts down the radio part, causes the Terminal to lo
g
off from the GSM/GPRS network
and disables all AT commands whose execution requires a radio connection.
Airplane mode can be controlled by the AT commands AT^SCFG and AT+CALA:
 With AT^SCFG= MEopMode/Airplane/OnStart the Terminal can be configured to enter the Airplane
mode each time when switched on or reset.
 The parameter AT^SCFG=MEopMode/Airplane can be used to switch back and forth between
Normal mode and Airplane mode any time during operation.
 Setting an alarm time with AT+CALA followed by AT^SMSO wakes the module up into Airplane
mode at the scheduled time.
Multi-slot
Class
Maximum slot allocation Allowable Configuration Max data rate
Downlink Uplink Active
8 4 1 5 1 up; 4 down 8-12Kbps Send
32-48Kbps Receive
10 4 2 5 1 up; 4 down 8-12Kbps Send
32-48Kbps Receive
2 up; 3 down 16-24Kbps Send
24-36Kbps Receive
12 4 4 5 1 up 4 down
2 up 3 down
3 up 2 down
4 up 1 down
8-12kpbs per slot

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Average power consumption
Parameter Description Conditions Min Typ Max Unit
VPOWER Operating Voltage for one minute 8 5 12 30 V
33 V
POWER
Average supply current (average time 3 min.)
@25°C @ worst case: GSM 900 max power
level
Power Down mode @8V 0.45 mA
@12V 0.50
@30V 0.80
SLEEP mode @8V 40 mA
@12V 29
@30V 18
IDLE mode @8V 50 mA
@12V 36
@30V 21
Data GPRS 1Tx / 4Rx @8V 260 mA
@12V 173
@30V 77
Data GPRS 2Tx / 3Rx
(Power reduction = 3dB)
@8V 378 mA
@12V 248
@30V 108
Data GPRS 4Tx / 1Rx
(Power reduction = 6dB)
@8V 500 mA
@12V 330
@30V 140
IPOWER_P
(6)
Peak supply current
during transmission slot
(577s * No. of Tx every
4.6ms)
Power control level for
Pout max
@8V 1500 mA
@12V 910
@30V 340
The power consumption figures shown represent typical average current and making different multi-slot
configurations, the worst case being that of two uplink and three downlink slots.
(6) Typical values measured with antenna impedance = 50Ohm (return loss >20dB)

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External
power
6-28VDC
ASC1 ASC0
1.5.5 SIM Card
The MTX-65i-RS485-LC supports an external SIM card through the integrated SIM holder. Both 3V and
1.8V SIM technology is supported. Older, 5V SIM technology is not supported.
1.6 Precautions
The MTX-65i-RS485-LC as a standalone item is designed for indoor use only. For outdoor use it must be
integrated into a weatherproof enclosure. Do not exceed the environmental and electrical limits as
specified in Technical Data
1.7 Block diagram
Cinterion TC65i R1
GSM/GPRS
Wireless module
GSM Antenna
FME M connector
Mini
USB
USB
interface
Serial Port
RS232 Level
Shifter
15
pins
DSUB
SPI / I2C
Terminal
block
Power
RS485
2 wires
LED
Signalling
SIM Card
Reader

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2. MECHANICAL DESCRIPTION
2.1 Overview
The pictures below show the mechanical design of the module along with the positions of the different
connectors and mounting holes. The module case is made of durable PC/ABS plastic.
2.2. Dimensions
Figure 5. Dimensions of the MTX-65i+RS485 terminal in mm

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3. ELECTRICAL DESCRIPTION
All electrical connections to the module are protected in compliance with the standard air and contact
Electrostatic Discharge (ESD).
The module uses the following industry standard connectors:
 High density 15 pin D-Sub (Main RS232 UART and extended I/O interface)
 5 pin terminal block for DC powering and RS485 BUS
 SIM card reader
 FME male coaxial jack (GSM antenna connector)
 USB mini connector
3.1 Power Connector
A terminal block 5-way connector, shared with RS485 BUS as shown and described below, supplies and
controls the D.C. power to the modem.
The supply voltage, VCC, required by the modem is in the range of 9-28V DC. We recommend a 12V DC
power supply. The power supply has to be a single voltage source capable of providing a peak during an
active transmission. The uplink burst causes strong ripples (or a drop) on the power lines.
By DEFAULT, the MTX-65iI-RS485-LC will switch on automatically when power supply is applied at PIN 4
and PIN 5.
Note. VCC and GND are reverse polarity and overvoltage protected
PIN: Signal Dir Limits Description
1 -RxB I/O RS485
2 +RxA I/O RS485
3 AUTO ON Input 0 – Vin NOT CONNECTED.
4 VCC Input 9-32 VDC Positive power DC
5 GND Input Negative power (ground)

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3.2 Mini USB Connector
The USB 2.0 interface allows connectivity to all relevant PCs and control boards in office and industrial
environments. The USB interface is a USB 2.0 full speed (12Mbit/s) interface for AT-C modem
functionality between the MTX-65i-RS485-LC Terminal and e.g. a PC.
It can be operated on a USB 2.0 Full Speed or High Speed root hub (a PC host), but not on a generic USB
2.0 High Speed hub which translates High Speed (480 Mbit/s/) to Full Speed (12 Mbit/s).
The MTX-65i-RS485-LC terminal’s USB port has different functions depending on whether or not Java is
running. Using Java, the lines may be used for debugging purposes. If Java is not used, the USB
interface is available as a command and data interface and for downloading firmware.
The USB I/O-pins are capable of driving the signal at min 3.0V. They are 5V I/O compliant. A USB 2.0
compatible connector is required to properly connect the module’s USB interface to the host.
Furthermore, the USB modem driver delivered with the MTX-65i-RS485-LC must be installed as described
below.
The USB host is responsible for supplying power across the VUSB_IN line to the module’s USB interface,
but not to other MTX-65i-RS485-LC interfaces. This is because the MTX-65i-RS485-LC is designed as a
self powered device compliant with the “Universal Serial Bus Specification Revision 2.0”
There are available drivers for Windows environment applications. Visit the MTX-65i-RS485-LC’s web
page at: www.mtx-terminals.com
3.3 GSM Antenna Connector
The antenna connector allows radio frequency (RF) transmission signals between the modem and an
external customer-supplied antenna. The modem is fitted with a 50, FME male coaxial jack.
The external antenna must be matched properly to achieve the best performance regarding radiated
power, DC-power consumption, modulation accuracy and harmonic suppression.

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3.4. SIM card reader
The MTX-65i-RS485-LC+G terminal is fitted with a SIM card reader designed for 1.8V and 3V SIM cards.
It is the flip-up type which is lockable in the horizontal position and is accessed through a removable
panel as shown below.
The card holder is a five wire interface according to GSM 11.11. A sixth pin has been added to detect
whether or not the SIM card drawer is inserted.
Removing and inserting the SIM card during operation requires the software to be reinitialized. Therefore,
after reinserting the SIM card it is necessary to restart the MTX-65i-RS485-LC terminal.
The full operation of the MTX-65i-RS485-LC relies on a SIM card being inserted. Some MTX-65i-RS485-LC
functionality may be lost if you try to operate the control terminal without a SIM card.

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MTX-65i-RS485 User Manual V.1.0 Pag. 18
Subject to change without prior notice
3.6 MAIN Serial RS232 Interface Port ASC0
The modem supports a standard RS232 serial interface (EIA/TIA 574) via its 15 pin Sub-D connector,
shown below. It is connected to TC65i ASC0 port using a level shifter converter.
MTX-65i-RS485-LC Terminal is designed for use as a DCE (data circuit-terminating equipment) based on
the conventions for DCE-DTE connections it communicates with the customer application (DTE- data
terminating equipment) using the following signals:
• Port TxD @ application sends data to MTX-65i-RS485-LC Terminal’s TD.
• Port RxD @ application receives data from MTX-65i-RS485-LC Terminal’s RD.
The RS-232 interface is implemented as a serial asynchronous transmitter and receiver conforming to
ITU-T V.24 Interchange Circuits DCE. It is configured for 8 data bits, no parity and 1 stop bit and can be
operated at fixed bit rates from 300bps to 460,800bps.
Autobauding supports bit rates from 1.2bps to 460,800bps. Hardware handshake using the /RTS and
/CTS signals and XON/XOFF software flow control are supported.
The electrical characteristics of the serial port signals are shown below:
Pin Signal Dir Voltage levels Description
2 RD 0 O Min ±5V Received data
3 TD 0 I VILmax = 0.6V
VIHmin = 2.4V
VImax = ±25V
Transmitted data
14 GND - 0V Ground connection
7 RTS I VILmax = 0.6V
VIHmin = 2.4V
VImax = ±25V
Request to send
8 CTS O Min ±5V Clear to send
Note: Outputs at 3kOhm load
Features
• It includes the data lines TXD0 and RXD0; by default the status lines RTS0 and CTS0 are included.
• ASC0 is primarily designed for controlling voice calls, transferring CSD, fax and GPRS data and for
controlling the GSM engine with AT commands.
• Full Multiplex capability allows the interface to be partitioned into three virtual channels, but with CSD
and fax services only available on the first logical channel.
• By default it is configured for 8 data bits, no parity and 1 stop bit. The setting can be changed using the
AT command AT+ICF and if required, AT^STPB. .
• ASC0 can be operated at fixed bit rates from 300 bps to 460800 bps.
Pin Signal
2 RD 0
3 TD 0
14 GND
7 RTS (optional /SPICS)
8 CTS (optional /SPDI)

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MTX-65i-RS485 User Manual V.1.0 Pag. 19
Subject to change without prior notice
•By default it is configured in fixed rate 115200 bauds.
• Autobauding is not compatible with multiplex mode. Autobauding is NOT recommended when using
SDK debug and MES applications. Please use fixed baud rate, as 115200 8N1.
• Supports XON/XOFF software flow control. By default it’s supported RTS0/CTS0 hardware flow control.
The MTX-65i-RS485-LC supports a range of configurable I/Os on the 15 pin high density connector
together with I2C/SPI bus
Pin
MTX-65i-
RS485-LC
Signal
Dir Max. Voltage limits Description
1 I2CCLK
SPICLK O 0.2 - 3.05 V I2C or SPI bus clock signal
2 Rx0 O Min ±5V ASC0 RS232 Received data
3 Tx0 I
VILmax = 0.6V
VIHmin = 2.4V
VImax = ±25V
ASC0 RS232 Transmitted data
4 NC - Not Connected
5 NC - Not Connected
6 I2CDAT-
SPIDO I/O Input: 0.8 - 3.05V Output: 0.2 - 3.05V I2C data or SPI bus Data Output
7 RTS0
(op.SPICS) I
VILmax = 0.6V
VIHmin = 2.4V
VImax = ±25V
ASC0 RS232 Ready to Send
8 CTS0
(op.SPIDI) O Min ±5V ASC0 RS232 Carrier to Send
9 ADC2 I
Vimin = 0V, VImax = 2.4V
Ri  750kOhms
Measurement interval: 100ms – 30s
Sensitivity, accuracy: 2400 steps (1step = 1mv)
Accuracy: ± 0.5mV
Analog-Digital converter Input 2
10 VOUT O Vout = 4.2 VDC; Imax = 300mA. Regulated Power Supply 4.2V DC
11 NC - Not Connected
12 NC - Not Connected
13 NC - Not Connected
14 GND 0V Ground connection
15 ADC 1 I
Vimin = 0V, VImax = 2.4V
Ri  750kOhms
Measurement interval: 100ms – 30s
Sensitivity, accuracy: 2400 steps (1step = 1mv)
Accuracy: ± 0.5mV
Analog-Digital converter Input 1

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MTX-65i-RS485 User Manual V.1.0 Pag. 20
Subject to change without prior notice
3.7. RS485 BUS
The RS485 BUS is connected to TC65i ASC1 port using level shifter converter.
It meets or exceeds the requirements of ANSI TIA/EIA-485-A
PIN: Signal Dir Limits Description
1 -RxB I/O RS485
2 +RxA I/O RS485
3 AUTO ON Input 0 – Vin NOT CONNECTED. Reserved for
future use
4 VCC Input 9-32 VDC Positive power DC
5 GND Input Negative power (ground)