Sollae Systems
https://www.ezTCP.com
RS422/RS485 Modbus Gateway
SMG-5420 User Manual
Version 1.1
SMG-5420 User Manual Ver. 1.1
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This symbol, found on your product or on its packaging, indicates that
this product should not be treated as household waste when you wish to
dispose of it. Instead, it should be handed over to an applicable collection
point for the recycling of electrical and electronic equipment. By ensuring
this product is disposed of correctly, you will help prevent potential negative
consequences to the environment and human health, which could otherwise be caused by
inappropriate disposal of this product. The recycling of materials will help to conserve
natural resources. For more detailed information about the recycling of this product,
please contact your local city office, household waste disposal service or the retail
store where you purchased this product.
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Contents
1 Modbus Overview ................................................ - 4 -
1.1 Modbus .............................................................. - 4 -
1.2 Modbus Gateway ...................................................... - 5 -
2 Product Overview ............................................... - 6 -
2.1 Product Overview .................................................... - 6 -
2.2 Features ............................................................ - 6 -
2.3 Components .......................................................... - 6 -
2.4 Specification ....................................................... - 7 -
2.5 Interface ........................................................... - 8 -
2.5.1 Power ..................................................................... - 8 -
2.5.2 Ethernet .................................................................. - 9 -
2.5.3 Serial Port............................................................... - 9 -
2.5.4 LED ...................................................................... - 11 -
2.5.5 Function Button ......................................................... - 11 -
2.5.6 Setup Port............................................................... - 11 -
3 Preparation ................................................... - 12 -
3.1 Installing the Setting Tool ........................................ - 12 -
3.2 Connecting a Product ............................................... - 12 -
3.3 Searching Devices .................................................. - 12 -
3.4 Logging in ......................................................... - 12 -
4 Settings ...................................................... - 13 -
4.1 IP Address ......................................................... - 13 -
4.1.1 Obtain an IP address automatically ...................................... - 13 -
4.1.2 Use a Static IP address ................................................. - 14 -
4.2 Modbus Gateway ..................................................... - 15 -
4.2.1 Transmission Mode ....................................................... - 15 -
4.2.2 Baudrate (unit: bps) .................................................... - 15 -
4.2.3 Serial ................................................................... - 16 -
4.2.4 TCP ...................................................................... - 16 -
4.2.5 Advanced ................................................................. - 17 -
4.3 Advanced settings .................................................. - 19 -
4.3.1 Password ................................................................. - 19 -
5 Management .................................................... - 20 -
5.1 Checking Status .................................................... - 20 -
5.1.1 Product Information ..................................................... - 20 -
5.1.2 Communication Status .................................................... - 21 -
5.2 Factory Reset ...................................................... - 22 -
6 Technical Support and Warranty ................................ - 23 -
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6.1 Technical Support .................................................. - 23 -
6.2 Warranty ........................................................... - 23 -
6.2.1 Refund ................................................................... - 23 -
6.2.2 Free Repair Services .................................................... - 23 -
6.2.3 Charged Repair Services ................................................. - 23 -
7 Precaution and Exemption from Liability ....................... - 24 -
7.1 Precaution ......................................................... - 24 -
7.2 Exemption from Liability ........................................... - 25 -
7.2.1 English version ......................................................... - 25 -
7.2.2 French version .......................................................... - 26 -
8 Revision History .............................................. - 28 -
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1 Modbus Overview
1.1 Modbus
Modbus is a serial communications protocol originally published by Modicon (now
Schneider Electric) in 1979 for use with its programmable logic controller (PLCs).
As a matter of fact, Modbus has become a standard communication protocol.
Modbus serial line protocol is a master-slave protocol that a master communicates
with one or more slaves. A master sends Modbus queries to slaves and slaves send
responses to the master.
There are two transmission modes in Modbus serial line protocol and those are RTU
and ASCII. Comparisons of those two modes are as follows:
Division
Modbus/RTU
Modbus/ASCII
Basic
Commonly used
More efficient than ASCII mode
Less efficient than RTU mode
Used when the timer-related
requirements of the RTU mode
cannot be met
Coding System
8-bit binary
Hexadecimal, ASCII characters
Bits per Byte
1 start bit
8 data bits, LSB sent first
1 parity bit (or no parity bit)
1 stop bit (or 2 bits with no
parity)
1 start bit
7 data bits, LSB sent first
1 parity bit (or no parity bit)
1 stop bit (or 2 bits with no
parity)
Message
Framing
Use time intervals
char interval ≤ 1.5 char
frame interval ≥ 3.5 frame
Use ASCII characters
Start – 0x3A (‘:’)
End – 0x0D0A (CR+LF)
char interval ≤ 1 second
Frame
Checking
Filed
CRC
LRC
Frame
description
Slave Address (1)
Function Code (1)
Data (0 ~ 252)
CRC (2)
Start (1)
Slave Address (2)
Function Code (2)
Data (0 ~ 504)
LRC (2)
End (2)
Table 1-1 Comparisons of Modbus/RTU and Modbus/ASCII
With the evolution of networks, the demand for network communications of
industrial equipment has also increased. As a result, a network version became a
necessity for the Modbus protocol, the TCP/IP version called Modbus/TCP is released.
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1.2 Modbus Gateway
Figure 1-1 Modbus Gateway
Devices that use Modbus/TCP cannot directly communicate with devices that use
serial line Modbus protocols. Because not only the physical interfaces are different
but also the protocols are not compatible. If you want to implement the
communication, you need a device that convert and route data of both sides. We call
that kind of device Modbus Gateway.
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2 Product Overview
2.1 Product Overview
SMG-5420 is an industrial Modbus Gateway that converts and routes Modbus data
between the serial line and Modbus/TCP. This can help communicate between Modbus
master (or slave) of serial line and Modbus slave (or master) of network.
SMG-5420 provides 10/100Mbps Ethernet and RS422/RS485 serial port.
2.2 Features
⚫ RS422/RS485 Modbus Gateway
⚫ 10Base-T/100Base-TX Ethernet
⚫ RS422/RS485 serial port
⚫ Self-developed TCP/IP stack
2.3 Components
⚫ SMG-5420’s main body
⚫ DC 5V power adapter (optional)
⚫ 1.5M LAN cable (optional)
⚫ USB cable (Type A plug to Micro Type B plug, optional)
⚫ Bracket (optional)
⚫ Mounter for Din-Rail (optional)
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2.4 Specification
Power
Input Voltage
DC 5V (±0.5V)
Current Consumption
typically, 145㎃
Dimension
94㎜ x 57㎜ x 23㎜
Weight
Approximately 67g
Interface
Serial
1 x RS422/RS485
(baud rate: 1,200bps ~ 230,400bps)
Network
10Base-T/100Base-TX Ethernet
Temperature
Operating & Storage: -40 ~ 85℃
Approval
KC, CE, FCC
RoHS
RoHS Compliant
Table 2-1 Specification
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2.5 Interface
Figure 2-1 interface
2.5.1 Power
SMG-5420 requires DC5V power supply whose specification is as follows:
Figure 2-2 Power
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2.5.2 Ethernet
SMG-5420 provides 10/100Mbps Ethernet. The pin assignment is as follows:
Figure 2-3 Ethernet
2.5.3 Serial Port
⚫ Port Specification
Parameter
Value
Number
1
Type
RS422/RS485
Baud rate
1,200 ~ 230,400 [bps]
Parity
NONE, EVEN, ODD, MARK or SPACE
Data bit
8 or 7 (7 data bit is only available on using Parity)
Stop bit
1 or 2
Table 2-2 serial port parameters
SMG-5420 has a 3.5mm pitch 6-pole terminal block for connecting serial devices.
Figure 2-4 Serial Port
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⚫ RS485 Signal Lines
Label
Name
Description
Level
I/O
Wiring
TR+
TRX +
Data +
RS485
In/Out
Required
TR-
TRX -
Data -
RS485
In/Out
Required
G
GND
Ground
Ground
-
Required
Table 2-3 RS485 Signal Lines
⚫ RS422 Signal Lines
Label
Name
Description
Level
I/O
Wiring
TR+
TX +
Transmit Data +
RS422
Out
Required
TR-
TX -
Transmit Data -
RS422
Out
Required
R+
RX +
Receive Data +
RS422
In
Required
R-
RX -
Receive Data -
RS422
In
Required
G
GND
Ground
Ground
-
Required
Table 2-4 RS422 Signal Lines
Each signal line for RS422/RS485 has a 3.9KΩ built-in biasing resistor.
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2.5.4 LED
LED operations according to each state are as follows:
When the supplied power is stable: PWR
When the supplied power is NOT stable: PWR
When the script is running: RUN
When the script is NOT running: RUN
When a network is not connected: LINK
When a network is connected and an IP address is NOT assigned: LINK
When a network is connected and an IP address is assigned: LINK
When a TCP connection is NOT established: MTX & MRX
When sending valid Modbus data to the TCP: MTX
When receiving valid Modbus data from the TCP: MRX
When sending valid Modbus data to the serial port: STX
When receiving valid Modbus data from the serial port: SRX
2.5.5 Function Button
This button is used to implement factory reset.
2.5.6 Setup Port
This port is used for making a connection with a PC via USB cable.
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3 Preparation
3.1 Installing the Setting Tool
You need a program which is called spFinder to use this product. Download the
program on our web site and install it to your PC.
Functions of the spFinder are as follows:
⚫ Searching products connected via network and USB
⚫ Setting products
⚫ Monitoring status of products
3.2 Connecting a Product
Connect a product with your PC via a LAN cable or a USB cable. In the case of
using a LAN cable, note that your PC and the product should be on the same local
area network.
3.3 Searching Devices
Run spFinder on your PC and press the search button. Once you select one of
products searched and click it with right button of your mouse, two menus will be
popped up.
⚫ Setup: Setting the product
⚫ Status: Monitoring status of the product
3.4 Logging in
Before accessing to the searched product, you need to log in first. The default ID
and password are as follows:
Division
Default Values
ID
smg-5420
Password
smg-5420
Table 3-1 default values of ID and password
If the product has the default value for a password, spFinder automatically
processes the login.
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4 Settings
4.1 IP Address
4.1.1 Obtain an IP address automatically
This product can automatically obtain an IP address by DHCP. A DHCP server is
required to use this.
Figure 4-1 Obtain an IP address automatically
⚫ Select the [Obtain an IP address automatically].
⚫ Check the [Obtain DNS server address automatically] and click the [Write].
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4.1.2 Use a Static IP address
You can set a static IP address to this product.
Figure 4-2 Use a static IP address
⚫ Select the [Use static IP address].
⚫ Set the [Local IP address], [Subnet mask], [Gateway IP address] and [DNS IP
address].
⚫ Click the [Write] button to finish settings.
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4.2 Modbus Gateway
Figure 4-3 Modbus Gateway
4.2.1 Transmission Mode
This setting selects a transmission mode of serial line Modbus data. You can
select Modbus/RTU mode or Modbus/ASCII mode and the default is Modbus/RTU.
4.2.2 Baudrate (unit: bps)
This setting selects a baud rate of serial port. You can select one from the list
or type a baud rate. The default is 9,600bps.
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4.2.3 Serial
Parameter
Available Values
Default Values
Data Bits
8 or 7
8
Stop Bits
1 or 2
1
Parity
None, Even, Odd, Mark or Space
None
Table 4-1 Serial
4.2.4 TCP
⚫ Communication Mode
This setting defines a communication mode for TCP. TCP Server and TCP Client
are available and the default is TCP Server.
⚫ Peer Address
This setting defines an IP address of TCP server to be connected. This setting
is valid only if the Communication Mode is set to TCP Client.
⚫ Port
This setting defines a port number for TCP connection. The default is 502.
⚫ TCP Timeout (Unit: sec)
This setting defines expiration time for TCP connection in idle state. The
idle state means there is no sent or received data on TCP. The unit is second
and the default is 60.
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4.2.5 Advanced
⚫ Query Flow
This setting defines a direction of Modbus query. You can select TCP to Serial
or Serial to TCP and the default is TCP to Serial.
Figure 4-4 TCP to Serial
Figure 4-5 Serial to TCP
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⚫ Slave ID
This setting defines a slave address of serial Modbus device or unit ID of
Modbus/TCP. The ID can be set from 0 to 247 and the default is 0.
⚫ Response Timeout (Unit: ms)
This setting defines expiration time for a Modbus query. The default is 500.
⚫ Send Gateway Exception
This setting defines to send gateway’s exception data or not. When this value
is Enable, gateway sends exception data. The default is Enable.
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4.3 Advanced settings
Figure 4-6 Advanced settings
4.3.1 Password
Both ID and password are required to access to this product. Note that changing
the default password to another is highly recommended for security. The password
should be longer than 8 characters.
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5 Management
5.1 Checking Status
5.1.1 Product Information
⚫ Product Information Window
This area shows some major information of your product.
Figure 5-1 Product Information Window
⚫ Product Information List
Item
Description
Product name
Product name
Uptime
Elapsed time since it boots up (day / hour:min:sec)
IPv4
Assigned IPv4 address
Subnet
Assigned subnet mask
Gateway
Assigned gateway IP address
DNS
Assigned DNS IP address
Table 5-1 product information list
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5.1.2 Communication Status
⚫ Communication Status Window
This area shows some communication status of your product. This area is
refreshed every second.
Figure 5-2 communication status window
⚫ TCP STATE
Status
Description
LISTEN
Listen
CLOSED
Disconnected
CONNECTED
Connected
(IP and port of the connected host will be shown)
CONNECTING
Connecting
DISCONNECTING
Disconnecting
Table 5-2 TCP STATE
⚫ MODBUS STATISTICS
Item
Description
QUERY
Statistics of master’s query frame
RESPONSE
Statistics of slave’s response frame
net_rx
The quantity of received frame from the network
net_tx
The quantity of sent frame to the network
sio_rx
The quantity of received frame from the serial
sio_tx
The quantity of sent frame to the serial
rx_err
The quantity of discarded frame because of errors
timeout
The quantity of discarded frame because of timeout
Table 5-3 MODBUS STATISTICS
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⚫ DEVICE STATISTICS
Item
Description
TCP0
Statistics of TCP data (Unit: byte)
UART0
Statistics of serial data (Unit: byte)
TX
The quantity of sent byte to TCP (or serial)
RX
The quantity of received byte from TCP (or serial)
DROP
The quantity of discarded byte because of errors
Table 5-4 DEVICE STATISTICS
5.2 Factory Reset
Performing the Factory Reset, you can restore all the settings to the default
including the password. Follow the procedure below with checking the status of RUN
LED.
1. Press and immediately release the function button.
2. Press the function button and keep the state more than 5 seconds.
3. Once the RUN led is turned off, release the button within 2 seconds.
4. The factory reset is started when you release the button. After that, your
product will reboot.
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6 Technical Support and Warranty
6.1 Technical Support
If you have any question regarding operation of the product, visit Customer
Support FAQ corner and the message board on Sollae Systems’ web site or send us an
email at the following address:
⚫ E-mail: support@eztcp.com
⚫ Website Address for Customer Support: https://www.eztcp.com/en/support/
6.2 Warranty
6.2.1 Refund
Upon the customer’s request to refund the product within two weeks after purchase,
Sollae Systems will refund the product.
6.2.2 Free Repair Services
For product failures occurring within 2 years after purchase, Sollae Systems
provides free repair services or exchange the product. However, if the product
failure is due to user’s fault, repair service fees will be charged or the product
will be replaced at user’s expense.
6.2.3 Charged Repair Services
For product failures occurring after the warranty period (2 years) or resulting
from user’s fault, repair service fees will be charged and the product will be
replaced at user’s expense.
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7 Precaution and Exemption from Liability
7.1 Precaution
⚫ Sollae Systems is not responsible for product failures occurring due to
user’s alternation of the product.
⚫ Specifications of the product are subject to change without prior notice for
performance improvement.
⚫ Sollae Systems does not guarantee successful operation of the product if the
product was used under conditions deviating from the product specifications.
⚫ Reverse engineering of firmware and applications provided by Sollae Systems
is prohibited.
⚫ Use of firmware and applications provided by Sollae Systems for purposes
other than those for which they were designed is prohibited.
⚫ Do not use the product in an extremely cold or hot place or in a place where
vibration is severe.
⚫ Do not use the product in an environment in which humidity is high or a lot
of oil exists.
⚫ Do not use the product where there is caustic or combustible gas.
⚫ Sollae Systems does not guarantee normal operation of the product under the
conditions a lot of noise exists.
⚫ Do not use the product for a purpose that requires exceptional quality and
reliability relating to user’s injuries or accidents – aerospace, aviation,
health care, nuclear power, transportation, and safety purposes.
⚫ Sollae Systems is not responsible for any accident or damage occurring while
using the product.
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7.2 Exemption from Liability
7.2.1 English version
In no event shall Sollae Systems Co., Ltd. and its distributors be liable for any
damages whatsoever (including, without limitation, damages for loss of profit,
operating cost for commercial interruption, loss of information, or any other
financial loss) from the use or inability to use the SMG-5420 even if Sollae Systems
Co., Ltd. or its distributors have been informed of such damages.
The SMG-5420 is not designed and not authorized for use in military applications,
in nuclear applications, in airport applications or for use in applications
involving explosives, or in medical applications, or for use in security alarm, or
for use in a fire alarm, or in applications involving elevators, or in embedded
applications in vehicles such as but not limited to cars, planes, trucks, boats,
aircraft, helicopters, etc.
In the same way, the SMG-5420 is not designed, or intended, or authorized to test,
develop, or be built into applications where failure could create a dangerous
situation that may result in financial losses, damage to property, personal injury,
or the death of people or animals. If you use the SMG-5420 voluntarily or
involuntarily for such unauthorized applications, you agree to subtract Sollae
Systems Co., Ltd. and its distributors from all liability for any claim for
compensation.
Sollae Systems Co., Ltd. and its distributors entire liability and your exclusive
remedy shall be Sollae Systems Co., Ltd. and its distributors option for the return
of the price paid for, or repair, or replacement of the SMG-5420.
Sollae Systems Co., Ltd. and its distributors disclaim all other warranties,
either expressed or implied, including, but not limited to, the implied warranties
of merchantability and fitness for a particular purpose, with respect to the SMG5420 including accompanying written material, hardware and firmware.
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7.2.2 French version
⚫ Documentation
La documentation du boîtier SMG-5420 est conçue avec la plus grande attention.
Tous les efforts ont été mis en œuvre pour éviter les anomalies. Toutefois, nous ne
pouvons garantir que cette documentation soit à 100% exempt de toute erreur. Les
informations présentes dans cette documentation sont données à titre indicatif. Les
caractéristiques techniques peuvent changer à tout moment sans aucun préavis dans le
but d'améliorer la qualité et les possibilités des produits.
⚫ Copyright et appellations commerciales
Toutes les marques, les procédés, les références et les appellations commerciales
des produits cités dans la documentation appartiennent à leur propriétaire et
Fabricant respectif.
⚫ Conditions d’utilisations et limite de responsabilité
En aucun cas Sollae Systems Co., Ltd. ou un de ses distributeurs ne pourra être
tenu responsable de dommages quels qu'ils soient (intégrant, mais sans limitation,
les dommages pour perte de bénéfice commercial, interruption d'exploitation
commerciale, perte d’informations et de données à caractère commercial ou de toute
autre perte financière) provenant de l'utilisation ou de l'incapacité à pouvoir
utiliser le boîtier SMG-5420, même si Sollae Systems Co., Ltd. ou un de ses
distributeurs a été informé de la possibilité de tels dommages.
Le boîtier SMG-5420 est exclusivement prévu pour un usage en intérieur, dans un
environnement sec et non poussiéreux. Le boîtier SMG-5420 n’est pas prévu, ni
autorisé pour être utilisé en extérieur, ni de façon embarquée dans des engins
mobiles de quelque nature que ce soit (voiture, camion, train, avion, etc…), ni en
milieu explosif, ni dans des enceintes nucléaires, ni dans des ascenseurs, ni dans
des aéroports, ni dans des enceintes hospitaliers, ni pour des applications à
caractère médical, ni dans des dispositifs de détection et d’alerte anti-intrusion,
ni dans des dispositifs de détection et d’alerte anti-incendie, ni dans des
dispositifs d’alarme GTC, ni pour des applications militaires.
De même, le boîtier SMG-5420 n’est pas conçu, ni destiné, ni autorisé pour
expérimenter, développer ou être intégré au sein d’applications dans lesquelles une
défaillance de celui-ci pourrait créer une situation dangereuse pouvant entraîner
des pertes financières, des dégâts matériel, des blessures corporelles ou la mort de
personnes ou d’animaux. Si vous utilisez le boîtier SMG-5420 volontairement ou
involontairement pour de telles applications non autorisées, vous vous engagez à
soustraire Sollae Systems Co., Ltd. et ses distributeurs de toute responsabilité et
de toute demande de dédommagement.
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En cas de litige, l'entière responsabilité de Sollae Systems Co., Ltd. et de ses
distributeurs vis-à-vis de votre recours durant la période de garantie se limitera
exclusivement selon le choix de Sollae Systems Co., Ltd. et de ses distributeurs au
remboursement de votre produit ou de sa réparation ou de son échange. Sollae Systems
Co., Ltd. et ses distributeurs démentent toutes autres garanties, exprimées ou
implicites.
Tous les boîtiers SMG-5420 sont testés avant expédition. Toute utilisation en
dehors des spécifications et limites indiquées dans cette documentation ainsi que
les court-circuit, les chocs, les utilisations non autorisées, pourront affecter la
fiabilité, créer des dysfonctionnements et/ou la destruction du boîtier SMG-5420
sans que la responsabilité de Sollae Systems Co., Ltd. et de ses distributeurs ne
puissent être mise en cause, ni que le boîtier SMG-5420 puisse être échangé au titre
de la garantie.
⚫ Rappel sur l’évacuation des équipements électroniques usagés
Le symbole de la poubelle barré présent sur le boîtier SMG-5420 indique que vous
ne pouvez pas vous débarrasser de ce dernier de la même façon que vos déchets
courants. Au contraire, vous êtes responsable de l’évacuation du boîtier SMG-5420
lorsqu’il arrive en fin de vie (ou qu’il est hors d’usage) et à cet effet, vous
êtes tenu de le remettre à un point de collecte agréé pour le recyclage des
équipements électriques et électroniques usagés. Le tri, l’évacuation et le
recyclage séparés de vos équipements usagés permettent de préserver les ressources
naturelles et de s’assurer que ces équipements sont recyclés dans le respect de la
santé humaine et de l’environnement. Pour plus d’informations sur les lieux de
collecte des équipements électroniques usagés, contacter votre mairie ou votre
service local de traitement des déchets.
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8 Revision History
Date
Version
Description
Author
2019.06.20.
1.0
1. Initial release
Roy Lee
2019.07.08.
1.0
1. Correct some errors
Roy Lee
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