Sollae Systems SMG-5420 User manual

Sollae Systems
https://www.ezTCP.com
RS422/RS485 Modbus Gateway
SMG-5420 User Manual
Version 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
1Modbus Overview ................................................- 4 -
1.1 Modbus .............................................................. - 4 -
1.2 Modbus Gateway ...................................................... - 5 -
2Product 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 -
3Preparation ...................................................- 12 -
3.1 Installing the Setting Tool ........................................ - 12 -
3.2 Connecting a Product ............................................... - 12 -
3.3 Searching Devices .................................................. - 12 -
3.4 Logging in ......................................................... - 12 -
4Settings ......................................................- 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 -
5Management ....................................................- 20 -
5.1 Checking Status .................................................... - 20 -
5.1.1 Product Information .....................................................- 20 -
5.1.2 Communication Status ....................................................- 21 -
5.2 Factory Reset ...................................................... - 22 -
6Technical 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 -
7Precaution 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 -
8Revision 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 3.9KΩbuilt-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.