Logic IO RTCU LX4 pro User manual

Technical Manual
Version 1.01
RTCU LX4 pro
Advanced Industrial M2M/IoT Gateway

RTCU LX4 pro Technical Manual V1.01
Advanced Industrial 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
Introduction
The RTCU LX4 pro is a powerful successor to the RTCU DX4i pro with significant improvements in
features, capacity, power, and security. In addition, the RTCU LX4 pro is based on the latest LX
hardware architecture, offering an unprecedented balance between price and performance.
The RTCU LX4 pro is positioned for a broad range of professional industrial Internet of Things
applications. With onboard M-Bus / Wireless M-Bus and pulse counting inputs (S0), it is a perfect
component in advanced Energy Management 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 already implemented and
tested NX32 applications can execute without changes.
The RTCU LX4 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 LX4 pro can also operate as a secure and intelligent industrial router/firewall for LAN side
clients connecting to the Internet over the cellular interface.
This manual contains technical documentation covering the installation and usage of the RTCU LX4
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 ......................................................................................................................................................................2
Important Information.....................................................................................................................................................4
Technical Highlights ........................................................................................................................................................5
RTCU LX4 pro Overview ................................................................................................................................................7
Signal Overview ....................................................................................................................................... 10
Mini USB-B Connector............................................................................................................................. 12
Ethernet / LAN.......................................................................................................................................... 12
Power Supply..................................................................................................................................................................12
Digital outputs ................................................................................................................................................................13
Digital Inputs / S0 inputs / Ignition Input...................................................................................................................14
S0 compliant inputs (IEC62053-31, Class A compatible).................................................................... 14
Analog Inputs .................................................................................................................................................................16
Analog Outputs ..............................................................................................................................................................17
RS232 port........................................................................................................................................................................18
RS485 Port........................................................................................................................................................................18
RS485 port 1............................................................................................................................................... 19
RS485 port 2............................................................................................................................................... 19
1-Wire bus .......................................................................................................................................................................19
Wired M-Bus ...................................................................................................................................................................20
Wireless M-Bus (optional).............................................................................................................................................20
User interface ..................................................................................................................................................................21
Graphical LCD display............................................................................................................................ 21
Keypad....................................................................................................................................................... 23
System Menu............................................................................................................................................. 23
LED Indicators ................................................................................................................................................................25
User LED A and B .................................................................................................................................... 25
System LED S1 and S2 ............................................................................................................................. 25
Switches ...........................................................................................................................................................................27
DIP-switch................................................................................................................................................. 27
System switch (RST)................................................................................................................................. 27
Rechargeable Li-Ion Backup Battery............................................................................................................................28
LTE Worldwide Cat. 4 Cellular Engine.......................................................................................................................29
SIM-Card .........................................................................................................................................................................29
Antennas..........................................................................................................................................................................29
Cellular Antenna ...................................................................................................................................... 29
Wireless M-Bus Antenna (optional) ...................................................................................................... 29
SD-CARD reader ............................................................................................................................................................30
Approved SD-CARDs.............................................................................................................................. 30
Product Identification Label with Barcode .................................................................................................................31
Power Consumption ......................................................................................................................................................32
Appendices......................................................................................................................................................................33
Appendix A –Device configuration guide........................................................................................... 33
Appendix B –Installing the SIM-Card.................................................................................................. 36
Appendix C - Open Source Disclaimer ................................................................................................. 37
RTCU LX4 pro Specifications .......................................................................................................................................38

RTCU LX4 pro Technical Manual V1.01
Advanced Industrial M2M/IoT Gateway
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Important Information
Thank you very much for using a product from Logic IO Aps. Our products are designed for
professional use, and 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. Do not open the product. 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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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.
➢512 MByte NAND Flash (system boot, persistent memory, and file-systems).
➢Real-time clock with a dedicated backup battery.
Security:
➢Embedded firewall.
➢Port forward and NAT services.
➢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.
➢Internal SIM-card reader with support for eSIM.
➢Optional: Wireless M-Bus. EN 13757-4/7 OMS EU/CE.
Wired Communication:
➢100 Mbps Ethernet LAN interface.
➢Wired M-Bus interface with up to 20 slaves.
➢1-Wire bus for accessories such as ID-button reader, temperature sensors, etc.
➢1 x RS232 interface with handshake support.
➢2 x RS485 interface.
I/O Interfaces:
➢8 x digital inputs, up to 4 digital inputs configurable as IEC62053-31 CLASS A compliant.
➢8 x high-power solid-state digital outputs.
➢4 x analog inputs with 0..10 volt / 0..20 mA with 12 bit precision.
➢2 x analog outputs with 0..10 volt / 0..20 mA
➢Expandable I/O with standard Modbus modules.
Sensors:
➢Temperature sensor.

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User Interaction:
➢Graphical 144x32 pixels display.
➢Keypad with 8 keys for sophisticated user interaction and control.
➢3 x bi-color, 1 x single color LED.
➢High-speed Mini-USB service-port connector.
Audio:
➢Fully digitized audio system.
➢Transfer, store, and play audio.
➢Digitized cellular audio.
➢DTMF support for Interactive Voice Response applications.
Storage:
➢Internal flash drive with up to 64 MByte capacity.
➢Persistent memory and circular datalogger.
➢Standard SD-Card reader.
Power and Battery:
➢Operating voltage from 8 to 36VDC.
➢On-board 2 Ah Li-Ion battery with intelligent charging.
Encapsulation:
➢Housed in an industry-standard M36 DIN compliant encapsulation.
➢Two-part pluggable connectors for easy installation and maintenance.
Regulatory Approvals:
➢Radio Equipment Directive, RED 2014/53/EU.
➢EMC Directive, 2014/30/EU.
➢2011/65/EU RoHS Directive.

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RTCU LX4 pro Overview

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The user interface can be found on the front and consists of a 144x32 easy-to-read graphical LCD, a
keypad with eight keys, four user-controlled LEDs, and three system LEDs.
The graphical LCD can show information to the user with both text and graphics fully supported. In
addition, the LCD also has icons for battery level/charging-in-progress and network status.
The keypad can let the user interact with the LX4 pro and access the system menu.
Front-side view
The pluggable screw terminals on the top and bottom sides of the LX4 pro are used to make
connections to external equipment.
All the connectors are available externally for easy access and maintenance.
The bottom side of the RTCU LX4 pro has connectors for the following communication interfaces:
Ethernet, 1-Wire, RS232, RS485 Port 1 and Port 2, and wired M-Bus. The analog inputs/outputs are
also found on this side.
Bottom-side view
Graphical LCD 144x32
Keypad
LEDs
Pin 5 . . . . . . . . . . . . . . Pin 26
Pin 27 . . . . . . . . . . . . . . . . Pin 49
Reset Button
Ethernet
Connector
Pin 5 . . . . . . . . . . . . . . . Pin 26
Screw
terminals
Screw
terminals

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The top side of the RTCU LX4 pro has connectors for power, digital inputs, digital outputs, and an
SMA female connector for an external cellular antenna.
The SD-card reader, four DIP switches, and the mini-B USB connector used as a programming/service
interface are also found on this side.
Inside the encapsulation, the SIM card and various configuration/termination jumpers are located.
Pin 49 . . . . . . . . . . . . . . . . . Pin 27
Cellular
Antenna
DIP 1-4
Mini USB-B
SD-Card

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Signal Overview
Ethernet
1
27
PGND
2
28
SUPP
P
3
29
SUPP
4
30
DOUT SUPP
SGND
5
31
DOUT1
1-Wire
6
32
DOUT2
1-Wire LED
7
33
DOUT3
SGND
8
34
DOUT4
RS485 RSA 1
9
35
DOUT5
RS485 RSB 1
10
36
DOUT6
SGND
11
37
DOUT7
RS485 RSA 2
12
38
DOUT8
RS485 RSB 2
13
39
DOUT GND
RS232 TXD
14
40
SGND
RS232 RDX
15
41
DIN1 / S0IN1
RS232 RTS
16
42
DIN2 / S0IN2
RS232 CTS
17
43
DIN3 / S0IN3
M-Bus +
18
44
DIN4 / S0IN4
M-Bus –
19
45
DIN5 / IGN
AOUT 1
20
46
DIN6
AOUT2
21
47
DIN7
AIN1
22
48
DIN8
AIN2
23
49
SGND
AIN3
24
50
Cellular
antenna
AIN4
25
51
AGND
26
52
Pin 5-26 overview
Pin
Name
Description
5
SGND
Signal ground
6
1-Wire
1-Wire bus for accessories such as ID-Button / temperature
sensor
7
1-Wire LED
1-Wire ID-Button LED
8
SGND
Signal ground
9
RSA 1
RS485 non-inverting signal for the RS485 port 1
10
RSB 1
RS485 inverting signal for the RS485 port 1
11
SGND
Signal ground
12
RSA 2
RS485 non-inverting signal for the RS485 port 2

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13
RSB 2
RS485 inverting signal for the RS485 port 2
14
TXD
Transmit data for the RS232 port
15
RXD
Receive data for the RS232 port
16
RTS
Request to send for the RS232 port
17
CTS
Clear to send for the RS232 port
18
M-BUS+
M-Bus signal
19
M-BUS-/SGND
M-bus ground / Signal ground
20
AOUT1
Analog output 1
21
AOUT2
Analog output 2
22
AIN1
Analog input 1
23
AIN2
Analog input 2
24
AIN3
Analog input 3
25
AIN4
Analog input 4
26
AGND
Analog Ground
Pin 27-49 overview
Pin
Name
Description
27
PGND
Power ground, negative (-) connection
28
SUPP
Power supply, positive (+) connection
29
SUPP
Power supply, positive (+) connection
30
DOUT SUPP
Power supply for the digital outputs
31
DOUT1
Digital output 1
32
DOUT2
Digital output 2
33
DOUT3
Digital output 3
34
DOUT4
Digital output 4
35
DOUT5
Digital output 5
36
DOUT6
Digital output 6
37
DOUT7
Digital output 7
38
DOUT8
Digital output 8
39
DOUT GND
Digital ground
40
SGND
Signal ground
41
DIN1 / S0IN1
Digital input 1
42
DIN2 / S0IN2
Digital input 2
43
DIN3 / S0IN3
Digital input 3
44
DIN4 / S0IN4
Digital input 4
45
DIN5 / IGN
Digital input 5
46
DIN6
Digital input 6
47
DIN7
Digital input 7
48
DIN8
Digital input 8
49
SGND
Signal Ground

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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.
Ethernet / LAN
This is a standard 10Base-T/100Base-TX IEEE 802.3 compliant RJ45 Ethernet connector.
Please use an appropriate connector and cable, such as a standard CAT-5 twisted pair patch cable
The connector has the following LED indicators that show the LINK status and communication
activity.
Power Supply
The RTCU LX4 pro device must be supplied with 8-36 VDC from an external DC power source.
Positive power is applied to the SUPP pin and the ground to the PGND pin.
The SUPP and PGND are connected to the device internally through a common-mode filter. Both
SUPP terminals are tied together internally.
There are four different ground labels for ground connections: Supply ground (PGND), signal
ground (SGND), digital output ground (DOUT GND), and analog ground (AGND). The signal,
digital output, and analog grounds are filtered from the supply ground and tied together internally.
The supply ground (PGND) should only be connected to the external DC power source to filter the
noise from the power source.
All the SGND terminals are tied together internally. Therefore, please choose the SGND closest to the
signal terminal for the best possible noise immunity.
The RTCU LX4 pro is protected against wrong polarity. 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.
The RTCU LX4 pro contains an internal 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. When the wakeup/ignition inputs are activated with a logical high, the RTCU LX4 pro
device will wake up from a power-down mode.
Power supply pins
Pin
Name
Description
27
PGND
Power ground, negative (-) connection
28
SUPP
Power supply, positive (+) connection
29
SUPP
Power supply, positive (+) connection

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Digital outputs
The digital outputs control eight "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 output control circuit is supplied from the power supply connected to the DOUT SUPP
and DOUT GND. While the DOUT SUPP is not connected with the external DC supply input pin
SUPP and needs to be connected to an external DC power source, the DOUT GND is internally
connected with the system ground.
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.
Digital output pins
Pin
Name
Description
30
DOUT SUPP
Digital output supply, positive (+) connector
31
DOUT 1
Digital output 1
32
DOUT 2
Digital output 2
33
DOUT 3
Digital output 3
34
DOUT 4
Digital output 4
35
DOUT 5
Digital output 5
36
DOUT 6
Digital output 6
37
DOUT 7
Digital output 7
38
DOUT 8
Digital output 8
39
DOUT GND
Digital output ground, negative (-) connector
Specification for each digital output
Type
Min.
Max.
Unit
Push/Pull
0
36
VDC
Short-circuit, Overload, Overvoltage, and ESD protected
-
1.5
A
-
140
mΩ
On-state resistor per channel

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Digital Inputs / S0 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 SGND connector.
Digital inputs 1-4 can be configured individually as S0 input (IEX62053-31, Class A).
By default, the digital inputs are configured as normal inputs. For placement and configuration og the
hardware jumpers inside the unit, please refer to the configuration guide in Appendix A.
Please note: The DIN 5/IGN input is unique as it also functions as the ignition input. If the ignition
input is activated with a logically 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 wakeup.
Please note: Digital inputs 6-8 do not work as high-speed IO, so PCT is limited to 400Hz, and
incremental encoders are not supported.
The power management allows the possibility to configure a wakeup on one or more digital inputs
with individually configured falling- or rising edge detection. Please consult the RTCU IDE
documentation for additional information.
S0 compliant inputs (IEC62053-31, Class A compatible)
In S0 configuration, the relevant RTCU LX4 pro input will act as a 'pulse input device,' where a
current source is provided on the input connector so that a simple switch between the SGND and the
appropriate input will activate it. This is used in most electricity metering equipment.
S0 must be enabled from the application to work as an S0 compliant input.
Please notice: The RTCU LX4 pro unit must be supplied with a minimum of 16 VDC to fully comply
with the S0 standard. The inputs will still work when supplied with 12VDC but will not be in
compliance with the S0 standard.

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Digital input pins
Pin
Name
Description
Jumper Settings
40
SGND
Signal ground
41
DIN1 / S0IN1
S0 input 1
Digital input 1
Row 1, Position S
Row 1, Position N (default)
42
DIN2 / S0IN2
S0 input 2
Digital input 2
Row 2, Position S
Row 2, Position N (default)
43
DIN3 / S0IN3
S0 input 3
Digital input 3
Row 3, Position S
Row 3, Position N (default)
44
DIN4 / S0IN4
S0 input 4
Digital input 4
Row 4, Position S
Row 4, Position N (default)
45
DIN5 / IGN
Digital input 5
46
DIN6
Digital input 6
47
DIN7
Digital input 7
48
DIN8
Digital input 8
49
SGND
Signal Ground
Specification for each digital input:
Min.
Typ.
Max.
Unit
Logic "High"
8
12
40
VDC
Protected against transients and
low-pass filtered
@ 12 VDC input voltage level
In "normal digital input"-mode
Logic "Low"
-5
-
3
VDC
Bandwidth
-
20
-
kHz
Input impedance
-
14
-
kΩ

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Analog Inputs
The RTCU LX4 pro has four analog inputs, which can be configured individually to work either as
voltage or current measurement inputs using the configuration jumpers. The range in voltage mode is
0..10 VDC, and in current mode 0..20mA.
The conversion resolution is 12 bit.
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.
By default, the inputs are configured as voltage inputs. For replacement and configuration of the
hardware jumpers inside the device, please refer to the device configuration guide in Appendix D.
Analog input pins
Pin
Name
Description
22
AIN1
Analog input 1
23
AIN2
Analog input 2
24
AIN3
Analog input 3
25
AIN4
Analog input 4
26
AGND
Analog Ground
Specification for each analog input (voltage mode):
Min.
Typ.
Max.
Unit
Voltage
0
-
10
VDC
Protected against transients and
low-pass filtered
Resolution
-
-
12
Bit
Precision
-
0.5
0.6
%FSR
Cut-off frequency
-
1
-
kHz
Input impedance
-
40
-
kΩ
Specification for each analog input (current mode):
Min.
Typ.
Max.
Unit
Current
0
-
20
mA
Protected against transients and
low-pass filtered
Resolution
-
-
12
Bit
Precision
-
0.5
0.6
%FSR
Cut-off frequency
-
1
-
kHz
Input impedance
-
504
-
Ω

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Analog Outputs
The RTCU LX4 pro has two analog outputs, which can be configured individually to work either as
voltage or current outputs using the configuration jumpers. The range in voltage mode is 0..10 VDC,
and in current mode 0..20mA. The resolution of the digital-to-analog converter is 10bit or 1024 in
decimal scale.
The decimal value for 10V/20mA output is 1023, and 512 for 5V/10mA.
The output signal is connected to the external equipment between AOUTx and AGND. 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. In current mode, the specifications for the analog output
are only valid for a maximum load is maximum of 250Ω.
The inputs are low-pass filtered, ESD- and transient protected.
Please notice: The RTCU LX4 pro unit must be supplied with a minimum of 12VDC in order for the
analog outputs to work according to the specifications.
By default, the outputs are configured as voltage outputs. For replacement and configuration of the
hardware jumpers inside the device, please refer to the device configuration guide in Appendix D.
Analog output pins
Pin
Name
Description
20
AOUT1
Analog output 1
21
AOUT2
Analog output 2
26
AGND
Analog Ground
Specification for each analog output (voltage mode):
Min.
Typ.
Max.
Unit
Voltage
0
-
10
VDC
Protected against transients and
low-pass filtered
Resolution
-
-
10
Bit
Precision
-
0.5
0.8
%FSR
Load
10
-
-
kΩ
Specification for each analog output (current mode):
Min.
Typ.
Max.
Unit
Current
0
-
20
mA
Protected against transients and
low-pass filtered
Resolution
-
-
10
Bit
Precision
-
0.5
0.8
%FSR
Load
-
-
250
Ω

RTCU LX4 pro Technical Manual V1.01
Advanced Industrial M2M/IoT Gateway
Logic IO ApS. Ph: ([phone]
Holmboes Allé 14 Fax: [phone]
8700 Horsens Page 18 of 39 Email: [email protected]
Denmark www.logicio.com
RS232 port
This port can be used as a general-purpose RS232 serial port with hardware handshake signals.
RJ45 connector overview.
Pin
Name
Description
11
SGND
Signal ground
14
TXD
Transmit data for the RS232 port
15
RXD
Receive data for the RS232 port
16
RTS
Request to send for the RS232 port
17
CTS
Clear to send for the RS232 port
RS485 Port
RS485 is a multi-drop network with a maximum of 32 nodes connected simultaneously to the bus.
Each RS485 bus contains an RSA and an RSB signal and a signal ground, which must always be
connected to the common signal ground for all nodes connected to the RS485 bus!
The maximum cable length for the RS485 bus is according to the EIA/TIA-485-A standard (max.
1000m @ <100kbit); this limit is highly influenced by the quality of the cable, signaling rate, noise etc.
At longer cable lengths, noisy environments, or high communication speeds, it might be necessary to
terminate the transmission line with a 120
1
ohm resistor at each end of the transmission line to
terminate it and avoid signal reflections. If the RTCU LX4 pro is used as an endpoint node, the jumper
for the RS485 port can be inserted in order to terminate the RS485 communication lines with 120Ω. By
default, the RS485 communication lines are not terminated with 120 Ω. For placement and
configuration of the hardware jumpers inside the unit, please refer to the configuration guide in
Appendix A.
Please note: For best performance, protection, and noise immunity, it is advised to use a shielded
cable to connect the device to the RS485 communications bus.
1
Assuming use of a CAT5 twisted pair cable

RTCU LX4 pro Technical Manual V1.01
Advanced Industrial 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
RS485 port 1
This port is available on the pluggable screw terminals and is not shared with other sources.
RS485 port 1 pins
Pin
Name
Description
9
RSA 1
RS485 non-inverting signal for RS485 port 1
10
RSB 1
RS485 inverting signal for RS485 port 1
8
SGND
Signal ground
RS485 port 2
This port is available on the pluggable screw terminals and is not shared with other sources.
RS485 port 2 pins
Pin
Name
Description
12
RSA 2
RS485 non-inverting signal for RS485 port 2
13
RSB 2
RS485 inverting signal for RS485 port 2
11
SGND
Signal ground
1-Wire bus
The 1-Wire bus is available on the pluggable screw terminals. All 1-Wire communication goes
through a single connection, and all 1-Wire devices connected can retrieve power directly from the
bus (called parasitic power). For this, only two wires are needed –the 1-wire signal and the ground
reference –allowing minimal cable installations.
For 1-Wire ID-Button readers, which include a built-in LED, a dedicated output is available for this
purpose. Please consult the RTCU IDE documentation for further information.
RJ45 connector overview.
Pin
Name
Description
6
1Wire
1-Wire bus for ID-Button / Temperature sensor
7
1W-LED
1-Wire ID-Button LED
5
SGND
Signal Ground
Specification of the 1-Wire bus:
Max.
Unit
Total weight1
65
m
1 The term of weight has been described in “Modular 1-wire concept –Technical Manual” document.

RTCU LX4 pro Technical Manual V1.01
Advanced Industrial 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
Wired M-Bus
The RTCU LX4 pro has an onboard wired M-Bus interface compliant with EN 13757-2/3 and offers a
comprehensive API for communicating with up to 20 slave devices on the bus.
The M-Bus interface is short-circuiting protected and supports full master-mode functionality. The
RTCU LX4 pro device needs to be supplied with an external supply for the M-Bus interface to be
operational.
M-Bus port pins
Pin
Name
Description
18
M-BUS+
M-Bus signal
19
M-BUS-/SGND
M-bus ground / Signal ground
Specification for the M-Bus:
Min.
Typ.
Max.
Unit
Bus idle voltage
-
-
36
VDC
Protected against short-
circuiting
Slave devices
-
-
20
Speed
300
-
9600
bps
Wireless M-Bus (optional)
The RTCU LX4 pro supports an optional onboard wireless M-Bus interface compliant with EN 13757-
4/7 and offers a comprehensive API for collecting data from wireless M-Bus slaves.
The Wireless M-Bus interface is designed for OMS EU/CE applications, but other variants are also
available on request.
The module has support for modes S1, S2, T1, T2, and R2 as well as common reception of mode T
and mode C1 in the form of mode T1+C1 and T2+C1.
Specification for the Wireless M-Bus OMS EU/CE interface:
Min.
Typ.
Max.
Unit
Frequency
-
868
-
MHz
Number of channels
-
12
-
Data Rate
4.8
-
100
kchip/s
Max output power
-
-
10
dBm
Indicative LOS
-
500
-
meter