Logic IO RTCU LX2 pro User manual

Technical Manual
Version 1.00
RTCU LX2 pro
Advanced Industrial M2M/IoT Gateway

RTCU LX2 pro Technical Manual V1.00
Advanced Automotive M2M/IoT Gateway
Logic IO ApS. Ph: ([phone]
Holmboes Allé 14 Fax: [phone]
8700 Horsens Page 2 of 39 Email: [e-mail]
Denmark www.logicio.com

RTCU LX2 pro Technical Manual V1.00
Advanced Automotive M2M/IoT Gateway
Logic IO ApS. Ph: ([phone]
Holmboes Allé 14 Fax: [phone]
8700 Horsens Page 3 of 39 Email: [e-mail]
Denmark www.logicio.com
Introduction
The RTCU LX2 pro is a powerful successor to the RTCU MX2 turbo with significant features,
capacity, power and security improvements. The RTCU LX2 pro is based on the latest LX hardware
architecture, offering an unprecedented balance between price and performance
The RTCU LX2 pro is positioned for a broad range of professional Automotive Internet of Things
applications. With onboard Worldwide LTE Cat. 4, Dual-band GNSS, and BLE 5.3, the RTCU LX2
pro device is ready for tomorrow's advanced IoT applications.
The device rests on the NX32L (NX32 for Linux) architecture that embraces many new technologies
and, at the same time, maintains full backward compatibility, which ensures that already
implemented and tested NX32 applications can execute without changes.
The RTCU LX2 pro device has been designed to meet the ever-increasing security challenges. It offers
full TLS on all major protocols and includes a hardened protected execution environment with dual-
boot and automatic fallback and recovery.
The RTCU LX2 pro has an onboard Dual-band Multi-constellation GNSS positioning engine that
supports the concurrent reception of all four global GNSS systems. The Dual-band receiver tracks not
only L1 but also L5, significantly mitigating the multipath effect in an urban environment - ultimately
improving positioning accuracy substantially. The RTCU LX2 pro is also available in versions with
Dead-Reckoning and RTK.
This manual contains technical documentation covering the installation and usage of the RTCU LX2
pro device. For detailed information on the product's programming and software configuration,
please refer to the RTCU IDE documentation.
For detailed information on the powerful RTCU M2M Platform, please refer to the
RTCU M2M Platform datasheet.

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Table of Contents
Introduction..................................................................................................................................................... 3
Table of Contents............................................................................................................................................ 4
Important Information................................................................................................................................... 5
Differences between the RTCU MX2 turbo and the RTCU LX2 pro ....................................................... 6
Technical Highlights ...................................................................................................................................... 7
Graphical Overview ....................................................................................................................................... 9
External Connections ................................................................................................................................... 10
Overview ................................................................................................................................................... 10
Connector X1: 4 pin PWR connector ................................................................................................. 10
Connector X2: 12 pin COM connector .............................................................................................. 11
Connector X3: 16 pin I/O connector .................................................................................................. 12
Connector X4: 6 pin SER1 connector................................................................................................ 13
Connector SER2: RJ45 (RS232) connector ......................................................................................... 13
Mini USB-B Connector ........................................................................................................................ 13
Power Supply............................................................................................................................................ 14
Digital Outputs ......................................................................................................................................... 15
Digital Inputs / Ignition Input ................................................................................................................ 16
Analog Inputs / Flex Inputs .................................................................................................................... 17
CAN Communication Port...................................................................................................................... 19
RS232 Port 1............................................................................................................................................... 20
RS232 Port 2............................................................................................................................................... 20
RS485 Port.................................................................................................................................................. 21
1-Wire Bus ................................................................................................................................................. 22
DC-Out –5 Volt ........................................................................................................................................ 22
3D Movement Sensor ................................................................................................................................... 23
LED Indicators .............................................................................................................................................. 24
User LED A and B .................................................................................................................................... 24
System LED S1 and S2 ............................................................................................................................. 24
Switches.......................................................................................................................................................... 26
User DIP-Switch........................................................................................................................................ 26
System Switch (RST) ................................................................................................................................ 26
Internal Li-Ion Backup Battery ................................................................................................................... 27
Wireless Communication ............................................................................................................................ 28
Worldwide LTE Cat. 4 Cellular Engine................................................................................................. 28
Bluetooth LE.............................................................................................................................................. 28
Multi GNSS Receiver ............................................................................................................................... 29
SIM-Card Readers......................................................................................................................................... 30
Internal / External SIM-Card Readers ................................................................................................... 30

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Installing the External SIM-card............................................................................................................. 30
Installing the Internal SIM-card.............................................................................................................. 31
Antennas ........................................................................................................................................................ 32
Cellular Antenna....................................................................................................................................... 32
GNSS Antenna .......................................................................................................................................... 32
Bluetooth Antenna.................................................................................................................................... 32
Product Identification Label with Barcode ............................................................................................... 33
Power Consumption .................................................................................................................................... 34
Appendices.................................................................................................................................................... 35
Appendix A –Opening the Device........................................................................................................ 35
Appendix B –Configuration DIP-switches........................................................................................... 36
Appendix C - Open Source Disclaimer ................................................................................................. 37
RTCU LX2 pro Specifications...................................................................................................................... 38
Important Information
Thank you very much for using a product from Logic IO Aps. Our products are designed for
professional use; therefore, this manual assumes technical knowledge and practice working with such
products.
This documentation does not entail any guarantee on the part of Logic IO Aps with respect to
technical processes described in the manual or any product characteristics set out in the manual. We
do not accept any liability for any printing errors or other inaccuracies in the manual, unless it can be
proven that we are aware of such errors or inaccuracies, or that we are unaware of these as a result of
gross negligence and Logic IO Aps has failed to eliminate these errors or inaccuracies for this reason.
This product is a complex and sensitive electronic product. Please act carefully and ensure
that only qualified personnel will handle and use the device. In the event of damage to the device
caused by failure to observe the information in this manual and on the device, Logic IO Aps shall not
be required to honor a warranty claim even during the warranty period and shall be exempted from
the statutory accident liability obligation. Any attempts to repair or modify the product also voids all
warranty claims. Only open the device to access the internal SIM card reader. There is no user-
serviceable part inside.
Please contact Logic IO for any technical or commercial inquiries:
Logic IO Aps.
Holmboes Alle 14
8700 Horsens
Denmark
Phone: [phone]
Support: suppo[email protected]
URL: www.logicio.com

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Differences between the RTCU MX2 turbo and the RTCU LX2 pro
The table below lists the differences between the RTCU LX2 pro and the RTCU MX2 turbo LTE:
Feature
RTCU LX2 pro
RTCU MX2 turbo LTE
Cellular Engine
LTE Cat. 4 (Worldwide)
LTE Cat. 1 (EMEA)
Bluetooth LE
√
X
GNSS
Dual-Band (L1 C/A and L5)
Single-band (L1 C/A)
Digital Inputs
6
5
Analog Inputs
0..10V / 0-30V
0-10V
DC-Out
5V
3.3V
XVoice
X
√
Headset
X
√
CAN-Bus
2
1
Motion Sensor
Accelerometer/Gyroscope
Accelerometer
Service/Programming Port
USB
RS232
Configuration
DIP-switch
Jumper
Storage
eMMC
VFRAM
SD-card
FRAM
6-pin connector (X4)
RD
4
1
TD
GND
5
2
CAN2-H
GND
6
3
CAN2-L
RD
4
1
TD
GND
5
2
RS-Detect
GND
6
3
DC-Out
12-pin connector (X2)
1W-LED
7
1
1-Wire
GND
8
2
GND
CAN1-L
9
3
CAN1-H
GND
10
4
DIN6
GND
11
5
RS485A
DC-Out
12
6
RS485B
1W-LED
7
1
1-Wire
GND
8
2
GND
CAN-L
9
3
CAN-H
GND
10
4
XVoice
GND
11
5
RS485A
DC-Out
12
6
RS485B

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Technical Highlights
Platform:
➢Based on the RTCU M2M Platform.
➢NX32L (NX32 for Linux) execution architecture.
oRTCU IDE development tool.
oOperates under a full and highly optimized Linux variant.
oOpen and extendable with Platform SDK.
LX Hardware Core:
➢Cortex-A7 32-bit ARM processor operating at up to 1 GHz.
➢Cortex-M4 32-bit co-processor for advanced power management.
➢Hardware floating-point and DSP instructions.
➢128 MByte RAM.
➢Up-to 512 MByte NAND Flash (system boot, persistent memory, and file-systems).
➢Real-time clock with a dedicated backup battery.
Security:
➢Embedded firewall.
➢TLS/SSL support with full certificate management.
➢TLS/SSL supporting all significant TCP protocols, such as RCH, FTP, SMTP, MQTT, and sockets.
➢Hardware-assisted encryption/authentication: AES-128, AES-192, AES-256, DES, TripleDES, HASH,
RND and RSA signature.
Wireless Communication:
➢LTE Cat. 4 Worldwide Multi-Band Cellular Engine.
➢Dual SIM-card readers with support for eSIM.
➢Dual-Band, Multi-constellation GNSS positioning engine.
➢Bluetooth LE 5.3.
Wired Communication:
➢2 x Full CAN 2.0B channels with hardware filtering and multi-speed support.
➢1-Wire bus for accessories such as ID-button reader, temperature sensors, etc.
➢2 x RS232 interface with handshake support.
➢1 x RS485 interface.
I/O Interfaces:
➢6 x digital inputs.
➢4 x high-power solid-state digital outputs.
➢2 x analog inputs with 0..10 volt / 0..30 volt.
➢Expandable I/O with standard Modbus modules.
Sensors:
➢3-axis Accelerometer with 16g scale.
➢3-axis Gyroscope with 2000 dps scale.
➢Temperature sensor.

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User Interaction:
➢4 x bi-color LED.
➢Dual user DIP-switches.
➢Reset/recovery switch.
➢High-speed Mini-USB service-port connector.
Audio:
➢Fully digitized audio system.
➢Digitized cellular audio.
➢DTMF support for Interactive Voice Response applications.
Storage:
➢Internal eMMC flash drive with 4 GB capacity.
➢Persistent memory and circular datalogger.
Power and Battery:
➢Operating voltage from 8 to 36VDC.
➢On-board 2 Ah Li-Ion battery with intelligent charging.
Encapsulation:
➢Housed in durable aluminum encapsulation.
Regulatory Approvals:
➢2007/46/EC UN ECE R10 Rev. 06 (E1).
➢Radio Equipment Directive, RED 2014/53/EU.
➢EMC Directive, 2014/30/EU.
➢2011/65/EU RoHS Directive.

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Graphical Overview
A graphical overview of the front- and back are shown below:
SIM Card Reader
Service Port
DIP-Switch
Reset Button
SER2
A
S1
S2
B
BT Antenna
GNSS Antenna
Cell Antenna
X3: I/O
9
1
X1: PWR
X2: COM
X4: SER1
1
3
1
7
1
4
Eject Button

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External Connections
Connections to external equipment are made via the connectors located on the back and front of the
RTCU LX2 pro.
The front panel is equipped with connectors commonly accessed by the user: SIM-Card, DIP-switch,
Service/programming port, LED's, RS232 and the reset button. Additionally, the configuration DIP-
switches are placed directly behind the front panel.
The back panel holds all connectors necessary for installation: 4-pin (X1) power and ignition, 6-pin
(X4) for RS232 and CAN, 12-pin (X2) for different communication interfaces and a 16-pin (X3) for
analog and digital I/O. Connection to the cellular antenna is via an SMA(F), connection to a 3V active
GNSS antenna via an SMA(F), and connection to the Bluetooth antenna via an RP-SMA(F) connector.
Overview
Connector X1: 4 pin PWR connector
SUPP
3
1
SUPP
PGND
4
2
DIN5/IGN
Pin
Name
Description
1
SUPP
Power supply, positive (+) connection
2
DI5/IGN
Digital input 5 / Ignition input (Shared with X3)
3
SUPP
Power supply, positive (+) connection
4
PGND
Power Ground

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Connector X2: 12 pin COM connector
1W-LED
7
1
1WIRE
GND
8
2
GND
CAN1-L
9
3
CAN1-H
GND
10
4
DIN6
GND
11
5
RS485A
DC-Out
12
6
RS485B
Pin
Name
Description
1
1WIRE
1-Wire bus
2
GND
Signal Ground
3
CAN1-H
CAN-bus 1 H-signal
4
DIN6
Digital input 6
5
RS485A
RS485 non-inverting signal
6
RS485B
RS485 inverting signal
7
1W-LED
1-Wire ID-Button LED
8
GND
Signal Ground
9
CAN1-L
CAN-bus 1 L-signal
10
GND
Signal Ground
11
GND
Signal Ground
12
DC-Out
5V/300mA DC-Out for external equipment.

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Connector X3: 16 pin I/O connector
AIN2
8
16
AGND
AIN1
7
15
AGND
DIN5
6
14
GND
DIN3
5
13
DIN4
GND
4
12
GND
DIN1
3
11
DIN2
DOUT3
2
10
DOUT4
DOUT1
1
9
DOUT2
Pin
Name
Description
1
DOUT 1
Digital output 1
2
DOUT 3
Digital output 3
3
DIN 1
Digital input 1
4
GND
Signal Ground
5
DIN 3
Digital input 3
6
DIN 5/IGN
Digital input 5 / Ignition input (Shared with X1)
7
AIN 1
Analog input 1
8
AIN 2
Analog input 2
9
DOUT 2
Digital output 2
10
DOUT 4
Digital output 4
11
DIN 2
Digital input 2
12
GND
Signal Ground
13
DIN 4
Digital input 4
14
GND
Signal Ground
15
AGND
Analog Ground
16
AGND
Analog Ground

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Connector X4: 6 pin SER1 connector
RD
4
1
TD
GND
5
2
CAN2-H
GND
6
3
CAN2-L
Pin
Name
Description
1
TD
Transmit Data from serial port 1, RS232 compatible
2
CAN2-H
CAN-bus 2 H-signal
3
CAN2-L
CAN-bus 2 L-signal
4
RD
Receive Data for serial port 1, RS232 compatible
5
GND
Signal Ground
6
GND
Signal Ground
Connector SER2: RJ45 (RS232) connector
1
2
3
4
5
6
7
8
DSR
DCD
DTR
GND
RD
TD
CTS
RTS
Pin
Name
Description
1
DSR
Data Set Ready, RS232 compatible
2
DCD
Data Carrier Detect, RS232 compatible
3
DTR
Data Terminal Ready, RS232 compatible
4
GND
Signal Ground
5
RD
Receive Data for serial port 2, RS232 compatible
6
TD
Transmit Data from serial port 2, RS232 compatible
7
CTS
Clear To Send, RS232 compatible
8
RTS
Request To Send, RS232 compatible
Mini USB-B Connector
This USB port is for programming and communication with the RTCU IDE or other RACP-compliant
applications. A standard USB cable can be used between the device and the PC.

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Power Supply
The RTCU LX2 pro device must be supplied with 8..36 VDC from an external DC power source
connected to the X1 connector. Positive power is applied to the SUPP pin, and the ground is
connected to the PGND pin.
The connector has two "SUPP" supply pins, which also supply power to the digital outputs. If the
total current consumption on the digital outputs exceeds 5A, then power must be applied to both
pins. Otherwise, one pin is sufficient.
There are three different labels for the ground connections:
•Power Ground (PGND)
•Signal Ground (GND)
•Analog Ground (AGND)
The signal and analog grounds are filtered from the power ground. Power ground must only be used
as a power supply return path. The signal ground is used as a ground reference for digital I/O's and
serial interfaces. The analog ground is a low-noise ground reference for the analog inputs.
The RTCU is protected against wrong polarity. For example, if a chassis or system ground is
connected to either SGND or AGND, a wrong polarity on the supply lines will destroy the internal
GND connection. A fuse can be installed on the positive supply to avoid such a scenario.
The RTCU also contains an internal high-capacity backup battery, which will supply the RTCU if the
external power supply fails or is disconnected. By default, the RTCU is powered down when a power
failure occurs. This setting, however, can be changed. Please consult the RTCU IDE online help for
more information.
Disabling the external DC power from the application interface and forcing the device to operate on
the internal backup battery is supported. Please consult the RTCU IDE documentation for additional
information.
When the ignition input is activated with a logical high, the RTCU unit will wake up if it is in power-
down mode. The ignition input (digital input 5) is available on the power connector to minimize the
need for connectors in minimal installations, but it is also available on the X3 connector (digital I/O
and analog Inputs) - only one should be used at a time.
X1: 4 pin PWR connector overview
Pin
Name
Description
1
SUPP
Power supply, positive (+) connection
2
DI5/IGN
Digital input 5 / Ignition input (Shared with X3)
3
SUPP
Power supply, positive (+) connection
4
PGND
Power Ground

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Digital Outputs
The digital outputs control four "high-side" switches. They function like contacts, where one side is
connected to the positive supply of the RTCU unit, and the other side is to the output. The switches
are protected against short circuits, ESD, and electronic kickback from inductive loads such as a relay.
The maximum switchable inductance is 20mH and must not be exceeded.
The digital outputs are supplied through the X1 power connector that also supplies the rest of the
RTCU unit. As the power is also the RTCU LX2 pro main power, a power fail would also affect the
digital outputs.
The RTCU unit offers advanced power management that can enable one or more outputs while the
RTCU is in low-power mode. Please consult the RTCU IDE documentation for additional
information.
X3: 16 pin I/O connector overview
Pin
Name
Description
1
DOUT 1
Digital output 1
9
DOUT 2
Digital output 2
2
DOUT 3
Digital output 3
10
DOUT 4
Digital output 4
Specification for each digital output
Type
Max.
Unit
Solid state
36
VDC
Short-circuit, ESD,
Inductive kickback protected up to 20mH.
1.5
A
Please note: Special attention to wiring must be taken; if the total current consumption of the digital
outputs exceeds 1.5A, then PGND must be used as a return path for the output(s).
If the total current consumption of the digital outputs exceeds 5A, the two SUPP pins must be used
for supply.

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Digital Inputs / Ignition Input
The digital inputs are all low-pass filtered and transient-protected. To activate the inputs, connect a
positive voltage between the input and the GND connector.
Please note: The DIN 5/IGN input is special as it also functions as the ignition input. If the ignition
input is activated with a logical high or low (Wait For Event mode only), it will wake up the unit
when the RTCU is in low power mode. A power apply will also wake up the unit, if it is in power-
down mode or WaitForEvent mode with power apply and/or ignition selected for wake-up.
The DIN 5/IGN input is available on both the X1 power connector and the X3 connector together with
the other digital inputs –only one should be used at a time.
The power management allows the possibility to configure a wake-up on one or more digital inputs
with individually configured falling- or rising edge detection. Please consult the RTCU IDE
documentation for additional information.
X3: 16 pin I/O connector overview
Pin
Name
Description
3
DIN 1
Digital input 1
11
DIN 2
Digital input 2
5
DIN 3
Digital input 3
13
DIN 4
Digital input 4
6
DIN5/IGN
Digital input 5 / Ignition input. (Shared with X1)
4
GND
Signal Ground
10
GND
Signal Ground
14
GND
Signal Ground
X2: 12 pin I/O connector overview
Pin
Name
Description
4
DIN6
Digital input 6
10
GND
Signal Ground
Specification for each digital input
Min.
Typ.
Max.
Unit
Logic "High"
8
12
40
VDC
Protected against transients and low-
pass filtered
Logic "Low"
-5
-
3
VDC
Cut-off frequency
-
25
-
kHz
Input impedance
-
13
-
kΩ

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Analog Inputs / Flex Inputs
The RTCU LX2 pro has two analog inputs. The analog inputs are voltage inputs specified with an
operating range of 0V to 30V DC. The conversion resolution is up to 12 bit(0..4095).
By default, the analog voltage is converted to a digital value with a resolution of 10-bit before being
presented to the application (0..1023). The application can change the resolution to the full 12 bit
(0..4095). Please consult the RTCU IDE documentation for further details.
The input signal is connected between AINx and AGND. Therefore, AGND must be connected to the
reference of the connected equipment. Please be aware that deviations may occur, as the system is
very noise-sensitive. Avoid long unshielded wires and significant fast-changing signals routed
parallel to the analog signals.
The inputs are low-pass filtered, ESD- and transient protected.
X3: 16 pin I/O connector overview
Pin
Name
Description
7
AIN 1
Analog input 1 / Flex input 1
8
AIN 2
Analog input 2 / Flex input 2
15
AGND
Analog Ground
16
AGND
Analog Ground
Specification for each analog input when used as analog input:
Min.
Typ.
Max.
Unit
Voltage
0
-
10
VDC
Protected against transients and
low-pass filtered
Precision is based on
measurements @ 25 ˚C
Resolution
-
-
12
Bit
Precision
-
0.3
0.5
%FSR
Cut-off frequency
-
4.5
-
kHz
Input impedance
-
30
-
kΩ
Specification for each analog input when used as flex input:
Min.
Typ.
Max.
Unit
Voltage
0
-
30
VDC
Protected against transients and
low-pass filtered
Precision is based on
measurements @ 25 ˚C
Resolution
-
-
12
Bit
Precision
-
0.2
0.3
%FSR
Cut-off frequency
-
4.5
-
kHz
Input impedance
-
30
-
kΩ

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The analog inputs are made available at the same time as both normal analog inputs with an
operating voltage range of 0-10V DC, and as flex inputs.
When used as flex inputs, the inputs are multi-mode inputs that can be configured to operate as either
analog or digital inputs. When operating as a Flex input the operating range is from 0V to 30V DC
and is configurable as digital inputs with customized threshold values.
The flex inputs can also be used as digital inputs, behaving the same way as the normal digital inputs
with the same threshold values or using different threshold values for more advanced features.
The same flex input can be used for multiple digital inputs with different settings, e.g., different
threshold values or debounce timing.
Configuring the flex input for band matching allows triggering the digital inputs at specific values,
making it possible to connect circuits that generate different voltages for different states and then read
the state directly.
See the RTCU IDE documentation for more details about configuring the flex inputs as digital inputs.

RTCU LX2 pro Technical Manual V1.00
Advanced Automotive M2M/IoT Gateway
Logic IO ApS. Ph: ([phone]
Holmboes Allé 14 Fax: [phone]
8700 Horsens Page 19 of 39 Email: [email protected]
Denmark www.logicio.com
CAN Communication Port
The RTCU provides the physical layer for the CAN (Controller Area Network) serial communication
interface in accordance with the ISO 11898 standard. The CAN bus is designed for high-speed (up to
1Mbit) robust communication in especially harsh environments like those found in the automotive
industry.
The CAN interface can be connected to an existing CAN network with a common protocol, such as
the J1939 standard, to retrieve information for surveillance or information purposes. The interface can
also be used as a robust serial data link with a non-standard protocol. Please consult the RTCU IDE
documentation for more information.
The physical layer consists of a two-wire (CAN-H and CAN-L) differential bus and a signal ground
for reference.
If the RTCU is connected to a "non-existing" network, a 120 ohm resistor must be connected between
CAN-H and CAN-L on each end of the transmission line in order to terminate it and avoid signal
reflections. This resistor can be connected on CAN bus 2 by activating configuration DIP-Switch 3,
which is located on the front-side, behind the front end-cap.
Be aware that connecting the RTCU to a CAN network can be dangerous. If the RTCU is not
configured with the correct network parameters, it will lead to network corruption and may interfere
with other connected equipment on the bus. Especially in vehicles, great precautions must be
observed to prevent communication interruptions.
By default, the write capability on the CAN bus is disabled. However, this can be enabled using
configuration DIP-switch 1 and 2 (located on the front, behind the end-cap) for the corresponding
CAN bus.
A wide range of software functions is available for easy access to the network. Please consult the
RTCU IDE documentation for further information.
X2: 12 pin COM connector overview
Pin
Name
Description
3
CAN1-H
CAN-bus H-signal
9
CAN1-L
CAN-bus L-signal
8
GND
Signal Ground
X4: 6 pin COM connector overview
Pin
Name
Description
2
CAN2-H
CAN-bus H-signal
3
CAN2-L
CAN-bus L-signal
6
GND
Signal Ground

RTCU LX2 pro Technical Manual V1.00
Advanced Automotive M2M/IoT Gateway
Logic IO ApS. Ph: ([phone]
Holmboes Allé 14 Fax: [phone]
8700 Horsens Page 20 of 39 Email: [email protected]
Denmark www.logicio.com
RS232 Port 1
This port can be used as a general-purpose RS232 serial port without hardware handshake signals.
X4: 6 pin SER1 connector overview
Pin
Name
Description
1
TD
Transmit Data from serial port 1, RS232 compatible
4
RD
Receive Data for serial port 1, RS232 compatible
5
GND
Signal Ground
RS232 Port 2
The port is a general-purpose RS232 port with all control signals, according to EIA-561 that defines
RS232 on a modular connector.
The signals are available on the RJ-45 connector located on the front panel of the RTCU.
Connector SER2: RJ-45 connector overview, fully RS232 compatible
Pin
Name
Description
1
DSR
Data Set Ready
2
DCD
Data Carrier Detect
3
DTR
Data Terminal Ready
4
GND
Signal Ground
5
RD
Receive Data for serial port 2
6
TD
Transmit Data from serial port 2
7
CTS
Clear To Send
8
RTS
Request To Send