Seneca R-KEY-LT User manual

ORIGINAL INSTRUCTIONS
USER MANUAL
R-KEY-LT
1-PORT MODBUS RTU/ASCII GATEWAY
SENECA S.r.l.
Via Austria 26 –35127 –Z.I. - PADOVA (PD) - ITALY
Tel. [phone] Fax [phone]
www.seneca.it

User Manual
R-KEY-LT
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Introduction
Contents of the present documentation refer to products and technologies described in it.
All technical data contained in the document may be modified without prior notice.
Content of this documentation is subject to periodical revision.
To use the product safely and effectively, read carefully the following instructions before use.
The product must be used only for the use for which it was designed and built: any other use must be
considered with full responsibility of the user.
The installation, programming and set-up is allowed only to authorized operators, physically and intellectually
suitable.
Set up shall be performed only after a correct installation and the user shall perform every operation described
in the installation manual carefully.
Seneca is not considered liable for failure, breakdown, accident caused because of ignorance or failure to
apply the indicated requirements.
Seneca is not considered liable for any unauthorized changes.
Seneca reserves the right to modify the device, for any commercial or construction requirements, without the
obligation to promptly update the reference manuals.
No liability for the contents of this documents can be accepted.
Use the concepts, examples and other content at your own risk.
There may be errors and inaccuracies in this document that may of course be damaging to your system.
Proceed with caution, and although this is highly unlikely, the author(s) do not take any responsibility for that.
Technical features subject to change without notice.
CONTACT US
Technical support
[email protected]
Product information
[email protected]
Document revisions
DATE
REVISION
NOTES
20/09/2017
1.00
First revision
This document is property of SENECA srl. Duplication and reproduction are forbidden, if not authorized.

User Manual
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TABLE OF CONTENTS
DEVICE DESCRIPTION AND INTENDED USE...........................................................4
1.1. FEATURES...............................................................................................................................................................................4
1.2. TECHNICAL SPECIFICATIONS ..............................................................................................................................................5
1.3. DESCRIPTION..........................................................................................................................................................................6
1.4. MODBUS ETHERNET TO SERIAL..........................................................................................................................................6
1.4.1. HOW IT WORKS .............................................................................................................................................................7
1.5. MODBUS SERIAL TO ETHERNET..........................................................................................................................................8
1.5.1. HOW IT WORKS .............................................................................................................................................................8
ELECTRICAL CONNECTIONS....................................................................................9
2.1. POWER SUPPLY .....................................................................................................................................................................9
2.2. SERIAL RS485 / RS232 TERMINAL POSITIONS ...................................................................................................................9
DEBUG LEDS.............................................................................................................10
DEFAULT CONFIGURATION ....................................................................................10
CONFIGURING THE DEVICE ....................................................................................11
5.1. FIRST ACCESS TO THE WEB SERVER WITH A DHCP SERVER......................................................................................11
5.2. FIRST ACCESS TO THE WEB SERVER WITHOUT A DHCP SERVER ..............................................................................13
5.3. TIPS FOR CONFIGURING IP FOR MULTIPLE R-KEY-LT DEVICES ..................................................................................15
5.4. DIP SWITCHES SW1 AND SW2 CONFIGURATION ............................................................................................................16
5.5. WEB SERVER CONFIGURATION.........................................................................................................................................16
5.6. SAVE OR LOAD A CONFIGURATION..................................................................................................................................22
TRAFFIC MONITOR...................................................................................................23
FIRMWARE UPDATE.................................................................................................25
EXTEND RS485 OVER ETHERNET: MODBUS SERIAL TO ETHERNET AND THEN
ETHERNET TO SERIAL ...................................................................................................26
GLOSSARY................................................................................................................27

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DEVICE DESCRIPTION AND INTENDED USE
WARNING!
This User Manual extend the information from the installation manual about the device configuration.
Use the installation manual for more info.
WARNING!
Under any circumstances, SENECA s.r.l. or its suppliers shall not be responsible for loss of recording
data/incomes or for consequential or incidental damage due to neglect or reckless mishandling of the
device, even though SENECA is well aware of these possible damages.
SENECA, its subsidiaries, affiliates, companies of the group, its suppliers and retailers shall not
guarantee that the functions will satisfy completely customer’s expectations or that device, the
firmware and the software shall have no errors or work continuously.
1.1. FEATURES
NR 1 RS485-RS232 serial port
NR 1 Fast Ethernet 10-100 Mbits with auto TX/RX
Up to 8 Modbus TCP-IP client in Modbus Ethernet to Serial mode
Up to 10 Modbus TCP-IP server in Modbus Serial to Ethernet mode
Support up to 247 Modbus serial slave devices
Simple configuration from the internal Webserver
Traffic Serial Packets Monitor from the internal Webserver
Support for Modbus RTU and Modbus ASCII serial protocols
Discovery Tools for search and configure devices (without changing the PC ip configuration)
DHCP / Static IP / Factory default available from dip switches SW2
Compact size: overall dimensions less than 110 x 53 x 32 mm
Baud rate for Modbus RTU/ASCII: from 1200 baud up to 115200 baud
Firmware Update from the internal webserver
Polarizer for RS485 BUS available from dip switches SW1
Quick installation on DIN 46277 rail

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1.2. TECHNICAL SPECIFICATIONS
GENERAL SPECIFICATIONS
Power supply
10 40 Vdc; 19 28 Vac 50 60 Hz
Absorption max
1 W
BOX
Dimensions
110 x 53 x 32 mm
Box, protection degree
Black, PA6, IP20
RS485/RS232
COMMUNICATION PORT
Number
1
Protocols
Modbus RTU/ASCII Slave/Master
RS232/RS485
Baud 1200..115200 configurable
Parity None/Odd/Even configurable
Stop Bit 1 or 2 configurable
Data Bit 7 or 8 configurable
10/100 MBIT FAST ETHERNET
PORT
Number
1
Portocols
Modbus TCP-IP Client/Server
ENVIRONMENTAL CONDITIONS
Temperature
-20°C ÷ +70°C
Humidity
30 ÷ 90% non-condensing
Storage temperature
-20°C ÷ +85°C
REFERENCE STANDARDS
EN 61000-6-4
Emission, industrial environmental
EN 61000-6-2
Immunity, industrial environmental
EN 61010-1
Safety

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1.3. DESCRIPTION
R-KEY-LT is a Modbus RTU/ASCII Gateway with a RS232/RS485 port and a Fast Ethernet 10-100MBits.
An internal Webserver is also available for configuration and real time values view.
R-KEY-LT is configurable in 2 different modes:
Modbus Ethernet to Serial (From Modbus TCP-IP to Modbus RTU/ASCII)
Modbus Serial to Ethernet (From Modbus RTU/ASCII to Modbus TCP-IP)
1.4. MODBUS ETHERNET TO SERIAL
In this scenario a Modbus TCP-IP master is connected with ethernet to R-KEY-LT, one or more serial Modbus
slaves (for example the Z-PC Seneca Series) are connected to the serial port.
A typical LAN connection is represented into this figure:
Also a communication with multiple clients is possible (Max 8 clients for device):

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1.4.1. HOW IT WORKS
The Modbus ethernet to serial is the simplest way to communicate with Modbus RTU/ASCII slaves by an
ethernet connection.
There is no need to configure which registers must be requested because the conversion from Ethernet to
serial is executed in real time.
Only the serial configuration must be made (baud rate, parity etc…).
The Master (client) Modbus TCP-IP request a modbus register by ethernet, then the R-KEY-LT convert the
request to the serial Modbus slave, the serial Modbus slave response is also retranslated in Modbus TCP to
the Master.
WARNING!

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It’s not possible to connect two Modbus serial slaves with the same Modbus address, if you need
to connect 2 Modbus RTU slaves with the same Modbus address (not configurable) you must use 2
R-KEY-LT devices.
1.5. MODBUS SERIAL TO ETHERNET
In this scenario a Modbus serial master must be connect to one or multiple Modbus TCP-IP servers.
The Modbus serial master is connected with the serial port to the R-KEY-LT, one or more Modbus TCP-IP
servers are connected to the ethernet port:
1.5.1. HOW IT WORKS
The Modbus serial to ethernet is the simplest way to create a communication between a serial master Modbus
device and one or more Modbus Ethernet TCP-IP server.
There is no need to configure which registers must be requested because the conversion from serial to
ethernet is executed in real time.
Only the serial configuration must be made (baud rate, parity etc…) and the server modbus station address
range (because one server can manage multiple station addresses).
The Master serial Modbus request a register from the RS232/RS485 port, then the R-KEY-LT convert the
request to the Modbus TCP-IP server, the Modbus TCP-IP server response is also retranslated in Modbus
serial to the Master.

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WARNING!
It’s not possible to connect more than one Modbus server using the same station address
ELECTRICAL CONNECTIONS
For more info please refer to the Installation manual, downloadable from:
http://www.seneca.it/products/r-key-lite
2.1. POWER SUPPLY
Connect the power supply to the electric clamp near the ethernet port:
2.2. SERIAL RS485 / RS232 TERMINAL POSITIONS
Connect the electric clamp 1, 2 and 3 for use the serial port as RS485 or 3, 4, 5, 6, 7 for use as RS232.
WARNING!
The A (+) and B (-) terminal can be inverted in some serial devices

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DEBUG LEDS
LED
STATE
MEANING
PWR
OFF
R-KEY-LT is switched off
PWR
FLASHING
R-KEY-LT is waiting an ip address from the DHCP server
PWR
ON
R-KEY-LT has acquired an IP address
RX
FLASHING
Data reception on serial port
TX
FLASHING
Data transmission on serial port
DEFAULT CONFIGURATION
The default configuration is:
IP: DHCP mode
Mode: Modbus Ethernet to Modbus RTU
Serial: Baud rate 38400,8bit ,No parity,1 stop bit

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CONFIGURING THE DEVICE
WARNING!
Dip switches configuration are active only after a reboot!
For reboot the device you can power off/on the power supply or press the “Reset” button until all leds
are ON (about 5 seconds).
5.1. FIRST ACCESS TO THE WEB SERVER WITH A DHCP SERVER
1) Switch OFF the R-KEY-LT
2) Force to flash the factory configuration by setting on SW2:
DIP 1 ON
DIP 2 ON
This will change the last configuration to factory default (with the IP set to DHCP, web server access
set to admin/admin).
3) Switch ON the R-KEY-LT
4) Set to use the flash configuration by setting on SW2:
DIP 1 OFF
DIP 2 OFF
5) Download from here:
http://www.seneca.it/products/r-key-lt
the Seneca Discovery Device tools then install it.
6) Launch the Seneca Discovery Device tool and click on the “Search” button, a list of Seneca devices
will be found. Now select the R-KEY-LT device:

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7) If you need to force a static IP compatible with your PC select the R-KEY-LT device and click on the
“ASSIGN” button
8) Now the device can be configured from the internal web server by typing in a browser the device ip
address, for example:
http://192.168.1.168
the default username/password are:
username admin
password admin
WARNING!
As long as the dhcp server does not provide a valid ip address (PWR led is flashing), the R-KEY-LT will
not be visible from the Discovery Device tool.

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WARNING!
If R-KEY-LT is configured with the ip set to DHCP but the DHCP server is not active,
after 5 minutes from the power up the R-KEY-LT will force the following fault ip address:
169.254.x.y
Where x.y are the last 2 MAC address values.
For example:
R-KEY-LT mac address = C8:F9:81:11:1A (hexadecimal values)
Fault ip address = 169.254.17.26
5.2. FIRST ACCESS TO THE WEB SERVER WITHOUT A DHCP SERVER
1) Switch OFF the R-KEY-LT
2) Force to static ip configuration by setting on SW2:
DIP 1 OFF
DIP 2 ON
This will force the ip to 192.168.90.101 static ip address
3) Switch ON the R-KEY-LT
4) Set to use the flash configuration by setting on SW2:
DIP 1 OFF
DIP 2 OFF
5) Download from here:
http://www.seneca.it/products/r-key-lt
the Seneca Discovery Device tools then install it.
6) Launch the Seneca Discovery Device tool and click on the “Search” button, a list of Seneca devices
will be found. Now select the R-KEY-LT device:

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7) Force a static IP compatible with your PC: select the R-KEY-LT device with ip 192.168.90.101 and
click on the “ASSIGN” button
8) Now the device can be configured from the internal web server by typing in a browser the device ip
address, for example:
http://192.168.1.168
the default username/password are:
username admin
password admin
WARNING!
Don’t connect on a network two or more devices with the same ip address!
Don’t connect on a network two or more devices with the SW2 DIP1=OFF and SW2 DIP2=ON
configuration!

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In this cases the R-KEY-LT will not be able to communicate from the ethernet port.
5.3. TIPS FOR CONFIGURING IP FOR MULTIPLE R-KEY-LT DEVICES
If in a network there are multiple R-KEY-LT devices to be installed, for speed up the installation follow this tips:
Install all the R-KEY-LT with the SW2 DIP1 = OFF and SW2 DIP2=OFF. If the devices are not used before
the ip is set to DHCP, if not force the device to DHCP with the dip switch.
If you have a DHCP server, all the devices can be found and configured with the Device Discovery tool.
If you don’t have a DHCP server after 5 minutes from the power up the devices will set a different static ip
169.254.x.y ,where x.y depends form the mac address and can once again can be found and configured
with the Device Discovery tool (without changing the PC ip configuration).
WARNING!
As long as the dhcp server does not provide a valid ip address (PWR led is flashing), the R-KEY-LT will
not be visible from the Discovery Device tool.
WARNING!
If R-KEY-LT is configured with the ip set to DHCP but the DHCP server is not active,
after 5 minutes from the power up the R-KEY-LT will force the following fault ip address:
169.254.x.y
Where x.y are the last 2 MAC address values.
For example:
R-KEY-LT mac address = C8:F9:81:11:1A (hexadecimal values)
Fault ip address = 169.254.17.26

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5.4. DIP SWITCHES SW1 AND SW2 CONFIGURATION
WARNING!
Dip switches configuration are active only after a reboot!
For reboot the device you can power off/on the power supply or press the “Reset” button until all leds
are ON (about 5 seconds).
SW1 ACTION
SW1 DIP1
SW1 DIP2
RS485 BUS POLARIZER ON
ON
ON
RS485 BUS POLARIZER OFF
OFF
OFF
SW2 ACTION
SW2 DIP1
SW2 DIP2
USE CONFIGURATION FROM FLASH
(DEFAULT)
OFF
OFF
WRITE AND USE FACTORY DEFAULT
CONFIGURATION (WITH DHCP ON)
ON
ON
FORCE IP TO 192.168.90.101
OFF
ON
RESERVED
ON
OFF
5.5. WEB SERVER CONFIGURATION
For access to the internal webserver type in a browser the R-KEY-LT ip address, for example:
http://192.168.90.101
then enter the username and password (default: user name = admin, password = admin).
The first page is the “Status” page:

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Now click on “Setup” for configure the device:
If you need to reset to the default parameters click on “FACTORY DEFAULT” button.
In this page you can save and load a previous configuration.
The first column represents the parameter name, the second column (current) it’s the current parameter value.
The last column can be used for changing the current configuration.
The parameters are explained below:
DHCP
Disable: A static Ip address is used
Enable: The IP address, the IP-Mask and the Gateway address are obtained from the DHCP server.
The R-KEY IP address can be obtained with the Device Discovery utility.
WARNING!
If R-KEY-LT is configured with the ip set to DHCP but the DHCP server is not active,
after 5 minutes from the power up the R-KEY-LT will force the following fault ip address:
169.254.x.y
Where x.y are the last 2 MAC address values.
For example:
R-KEY-LT mac address = C8:F9:81:11:1A (hexadecimal values)
Fault ip address = 169.254.17.26
STATIC IP ADDRESS
Static IP address when DHCP is Disable
STATIC IP MASK
mask when DHCP is Disable

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STATIC GATEWAY
Gateway address when DHCP is Disable
When a configuration it’s made you must confirm with “APPLY”, then the new configuration became operative.
WORKING MODE
Select between Modbus Serial to Ethernet or Modbus Ethernet to Serial.
TCP/IP PORT
TCP-IP port for the Modbus TCP-IP protocol used in “Modbus Ethernet to serial” mode (Max 8 clients).
PORT#1 MODBUS PROTOCOL
Select between Modbus RTU or Modbus ASCII protocol.
PORT#1 BAUDRATE
Used to Set the port baudrate
PORT #1 BITS

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Used to Set the number of bits for the serial communication.
PORT #1 PARITY
Used to Set the port parity (None, Odd or even).
PORT #1 STOP BITS
Used to Set the port parity (1 or 2; note that if the parity is set, only 1 bit can be used).
PORT #1 TIMEOUT
Used to Set the timeout on Modbus Master mode before making a new call.
WEB SERVER PORT
Used to Set the TCP-IP port for the Webserver.
WEB SERVER AUTHENTICATION USER NAME
Used to Set the User Name for accessing the Webserver (if User Name and Password are leave empty no
authentication is require for webserver access)
WEB SERVER AUTHENTICATION USER PASSWORD
Used to Set the Password for accessing the Webserver (if User Name and Password are leave empty no
authentication is require for webserver access)
IP CHANGE FROM DISCOVERY
Used to Set if a user is allowed to change IP configuration from the software “Seneca Discovery Device”
If “Modbus Serial to Ethernet” mode is selected you need to compile also the Modbus TCP-IP servers
parameters:

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