Romutec 0300 User manual

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romutec Steuer.-und Regelsysteme GmbH Jochsberger Straße 39 D-91592 Buch am Wald www.romutec.de
Subject to technical changes
Technical Documentation / Instruction Manual
Romutec Control Gateway 32
Modbus/TCP to Modbus/RTU-Bridge
for use in building automation and control systems
with
management and diagnostic web interface
for DIN rail mounting
romutec®
Steuer- u. Regelsysteme GmbH
Jochsberger Straße 39
D-91592 Buch am Wald
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]

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Contents
1 Features and advantages of RCG32.................................................................................................... 3
1.1 Copyright and legal notice............................................................................................................. 3
2 General information.............................................................................................................................. 4
2.1 Notes on the operating manual .................................................................................................... 4
2.2 Safety information......................................................................................................................... 4
3 System description............................................................................................................................... 5
4 Configuration ........................................................................................................................................ 6
4.1 Hardware....................................................................................................................................... 6
4.2 Bus connection to Modbus master devices .................................................................................. 8
4.2.1 Communication within Modbus master/slave systems......................................................... 8
4.2.2 Terminal assignment of the Modbus RTU (RS485) port......................................................... 8
4.2.3 Recommended cable types for bus wiring............................................................................. 8
4.2.4 Modbus commands supported .............................................................................................. 8
4.3 Configuration via Web Interface ................................................................................................... 9
4.3.1 Starting the Web Interface..................................................................................................... 9
4.3.2 WiFi Configuration.................................................................................................................. 9
4.3.3 Ethernet-Configuration ........................................................................................................ 10
4.3.4 Serial Configuration.............................................................................................................. 10
Appendix................................................................................................................................................ 11
A) Technical specifications ................................................................................................................ 11

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1 Features and advantages of RCG32
RCG32, the DIN rail mounted Modbus TCP/RTU Bridge from romutec®, provides the
following features:
•Native support of Modbus TCP
•Native support of Modbus RTU
•Supports all Modbus function codes
•Supports all response and exception Codes
•Programmed in accordance with Modbus Application Protocol Specification Rev. V1.1b3
•Web Interface
•Available Serial Configurations:
oDatabits: 5, 6, 7 or 8
oParity: None, Even, Odd
oStoppbits: 1 or 2
oBaudrate: 50Bd to 500‘000Bd
•WIFI in AP Mode
•WIFI in Station Mode
•Ethernet RJ45
•24V AC/DC-power supply input
•2 serial interfaces in bridge mode with different settings
•255 Telegrams buffer, dynamically allocated
1.1 Copyright and legal notice
Copyright ® 2021 romutec® Steuer- u. Regelsysteme GmbH. All rights reserved. Without the express written
permission, this manual may not be reproduced, transmitted, transcribed, stored in a data recording system, or
translated into any language or computer language, neither in whole or in part. This applies to any form and any
means, whether electronic, mechanical, magnetic, optical, manual, or any other way.
Modbus® is a registered trademark of Schneider Electric, licensed to the Modbus Organization, Inc.
Errors and changes excepted

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2 General information
2.1 Notes on the operating manual
To take full advantage of your RCG32-devices, you should read all the chapters of this manual
to get information about the features of the equipment and to learn how to safely use the
system.
2.2 Safety information
Before you put your devices into operation, you should read the following carefully. This also applies if
any questions should arise at a later time.
Intended use:
The devices are to be used exclusively for the terms and features specified in this documentation.
With improper use, the manufacturer assumes no product liability and warranty claims.
•Follow all warnings and notes marked on the device or listed in the technical documentation.
•Operate the devices only when properly mounted on a DIN rail or in an appropriate mounting
frame
•The modules should not be installed in the immediate vicinity of frequency converters.
•Frequency converters must be provided with all safety measures in order to comply with the
required regulations and guidelines (e.g. line filter, etc.)
•Do not use the product near water or other liquids which can damage the electronic
components.
•The supply voltage must correspond to the information in the technical data.
•The terminals of the device should only be wired by authorized and trained personnel.
•Do not perform wiring work whenever the device is powered. There is a risk of electrical
shock.
•Connecting and disconnecting the terminals or connectors under voltage should be avoided.
The devices might be destroyed.
•Make sure that no objects, e.g. screws or other fastening material, gets into the device.
•Avoid installation in areas with extreme temperature fluctuations. The temperature ranges for
storage and operation which are given in the datasheet must be maintained to ensure trouble-
free operation.
•Do not install in areas with requirements of explosion-protection (ANEX or any other areas)
•Use only network cables with insulation an minimum CAT5e-Declatration
However, should problems occur, do not try to repair the device yourself. Do not open or disassemble
the device. Doing so, parts inside the device might be damaged on contact. Basically, if you have any
problems please contact the manufacturer.

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3 System description
The romutec® RCG32 Bridge is an TCP Interface with two UARTs (RS485 Interfaces) which converts
the Modbus TCP telegrams to native RTU telegrams and vice versa.
Therefore, the TCP side is a slave device which is connected via WIFI or Ethernet to an Modbus
master device.
On serial side, the bridge is connected to a Modbus RTU network and works as master device.
The communication speed (baud rate) and also the serial config are set up in web interface.
The two serial interfaces can be set up via webserver with different settings depending baud rate,
format and parity. These two serial interfaces are named with serial 1 and serial 2. The serial 1
interface is an isolated RS485 transceiver with the terminals serial 1 A, serial 1 B and ISO GND. The
serial 2 interface is a non isolated RS485 transceiver with terminals serial 2 A and serial 2 B. Ground
potential of serial 2 is ground oft he supply voltage. End of line termination can be set for each serial
interface in the control panel via the webserver.

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4 Configuration
4.1 Hardware
Maximum number of expansion modules per Modbus interface
Basically, as many modbus devices can be connected to a bus interface as addresses can be set. The
complete address range of 0 ... 254 is available, but only the adresses 1..247 are for legal-use. The
adresses 248 until 254 are reserved in Modbus protocol. However, please adhere to the DDC’s
manufacturer's recommendations concerning the maximum number of slave devices which may be
connected to the bus interface of the master device, as well as any constraints given for the address
range.
Basically, on the bridge you can connect up to 192 devices on the isolated serial 1 side and 63
devices on the non isolated serial 2 side without a Repeater.
Address 0 is reserved for multicast, the addresses 248 to 254 are reserved for bridge and similar
infrastructure functions.
Installation and wiring
Installation and wiring of the module will be done in the cabinet on the mounting plate.
Addressing Serial Interface
All incoming Modbus TCP requests are sent out on both serial interfaces. So you have to ensure that
the address of every slave device is unique over both interfaces.
Addressing TCP/IP Interface
The address of the TCP/IP interface can be set in the web interface.
You have two options:
•DHCP
•Static IP address
If you choose the option DHCP, the bridge is given an IP address from an available DHCP-Server.
If you have set a static IP instead, the bridge will work with these settings on TCP/IP.
Except of your settings, the bridge is available any time on AP mode by starting the web interface
calling the URL http://192.168.10.1. In AP mode your management device will take an IP given from
bridge (DHCP), which usually is 192.168.10.2.

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Meaning of the status LED
The status LEDs are located on top of the bridge..They signal the following states:
LED Red:
LED Blue:
Button handling
The button labeled with WiFi symbol is multi functional.
Pressing the button:
- If status LED is off and you press the button once, you will activate WiFi in access point mode.
The LED starts to blink slowly red. Now you can access the webserver of the gateway if you
connect your device to the WiFi provided by the RCG32. On first start up the SSID of the WiFi
is romutec RCG32 followed by the MAC address to keep SSID unique.
WiFi password on first start up is 01234567.
If your device is connetcted succesfully to the RCG32, the status LED will turn to shine
steadily red.
All settings are configurable in the webserver.
When connection is lost, status LED will start blinking slowly again.
- If you press the WiFi button again, you will enter station mode of RCG32. The LED in this
mode will blink slowly red first. If you have set the WiFi credentials for station mode via
webserver, the RCG32 will search for an according WiFi network and connects to it. If RCG32
has established a connection succesfully, the status LED turns to shine steadily red, else it will
blink quickly red, showing that the WiFi settings are incorrect or the wanted WiFi is not
reachable.
- If you press the button again, the status LED will turn off. WiFi is completely disabled in this
state.
Holding the button:
- If you press and hold the button for 5 to 9 seconds, you can force a reboot of the RCG32.
Status LED is blinking quickly blue if you are within the 5 to 9 seconds.
- If you press and hold the button for 10 to 15 seconds, you can force a reboot including a reset
of the settings to default values. Status LED turns to shine steadily blue if you are within the
10 to 15 seconds.
Off
No WLAN mode started
Blinking 1Hz
Access Point mode started
Blinking 10Hz
Station mode started
On
Bridge connected to network (AP mode or
Station mode)
Off
Nothing
Blinking 10Hz
Button pressed and held for 5 to 9 seconds
Restarting the device, all settings stay active
On
Button pressed and held for 10 to 15 seconds
Reseting the device, all settings set to default
values

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4.2 Bus connection to Modbus master devices
4.2.1 Communication within Modbus master/slave systems
For communication between a controller (DDC or PLC) and the romutec® RCG32-Bridge devices, it is
necessary to configure an TCP interface of the controller as Modbus master.
To communicate with a slave device connected to the bridge, you have to send the telegrams to the
IP address of the romutec® RCG32-bridge devices. This telegram contains the request message
which is needed for the slave device, including the unique slave ID.
This is done with the programming software of the manufacturer of the controller.
For questions, please consult the manual or contact the manufacturer of the controller.
4.2.2 Terminal assignment of the Modbus RTU (RS485) port
The terminal assignment for the bus connection of the romutec® RCG32-bridge to Modbus RTU slave
devices is as follows:
Type of Interface
Function
Terminal No.
Modbus Slave
RS485-1
Rx-Tx (Net_B )
/Rx-/Tx (Net_A )
I-GND
1.6
1.5
1.8
Data+ (B)
Data- (A)
Bus-GND
RS485-2
Rx-Tx (Net_B)
/Rx-/Tx (Net_A)
GND = supply GND
1.4
1.3
1.1
Data+ (B)
Data- (A)
Bus-GND
The bus interface of serial 1 is electrically isolated. The I-GND terminals must always be wired,
whether with braided shield or individual strands, and connected to ground / earth potential. There is
no internal connection between I-GND of serial 1 and the GND of the power supply.
The terminal 1.7 is connected to the shield of the RJ45 Ethernet socket. To avoid any
unwanted behaviour of the device, connect that terminal direcly to earth potential.
4.2.3 Recommended cable types for bus wiring
For a total length up to 100m: more than 100m:
Cable type: LIYCY 1x2x0,5mm² shielded CYPIMF 1x2x0,5mm² shielded
Line resistance: < 4,0Ω / 100m < 4,0Ω / 100m
Capacitance: < 13.0nF / 100m < 6.0nF / 100m
4.2.4 Modbus commands supported
All Modbus commands (aka FC = Function Codes) are supported.
There are no restrictions in the bridge.

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4.3 Configuration via Web Interface
4.3.1 Starting the Web Interface
When starting the web interface, you will see an overview like shown in this picture:
4.3.2 WiFi Configuration
The default password for first access is ‚01234567‘. It can be changed at any time.

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4.3.3 Ethernet-Configuration
4.3.4 Serial Configuration

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Appendix
A) Technical specifications
Supply voltage: 24 V AC/DC, +- 10%
Current consumption 100 mA
Serial-Bus interface RS485
Protocol for serial bus Modbus RTU
Supported baud rates 50 Baud, 110 Baud, 150 Baud, 300 Baud, 1.200 Baud,
2.400 Baud, 4.800 Baud, 9.600 Baud, 19.200 Baud,
38.400 Baud, 57.600 Baud, 115.200 Baud,
230.400 Baud, 460.800 Baud, 500.000 Baud
Serial port parameter settings 5N1, 5N2, 5E1, 5E2, 5O1, 5O2,
6N1, 6N2, 6E1, 6E2, 6O1, 6O2,
7N1, 7N2, 7E1, 7E2, 7O1, 7O2,
8N1, 8N2, 8E1, 8E2, 8O1, 8O2
Network Interface WLAN
RJ45
Bus cycle time individually depending on the baud rate and the number of
data points that will be addressed
Memory microPC internally
Max. number of write cycles Configuration settings such as inverting the inputs are stored
in the internal EEPROM and can be overwritten up to 100‘000
times.
Environmental conditions
Operating temperature 0...50 °C
Transport and storage temperature 0...70 °C
Relative humidity 10...90%, non-condensing
Protection class IP 20
Dimensions Standard housing 1 TE
B x H x D (mm): 17.5 x 90 x 58