SST Automation GT200-EI-2RS485 User manual

Modbus / EtherNet/IP Gateway
GT200-EI-2RS485
User Manual
V 3.3
SST Automation
Email: [email protected]
www.SSTAutomation.com

User Manual
Modbus/EtherNet/IP Gateway
GT200-EI-2RS485
www.SSTAutomation.com
Important Information
Warning
The data and examples in this manual cannot be copied without authorization. SSTCOMM reserves the right to
upgrade the product without notifying users.
The product has many applications. The users must make sure that all operations and results are in accordance
with the safety of relevant fields, and the safety includes laws, rules, codes and standards.
Copyright
Copyright © 2022 by SST Automation. All rights reserved.
Trademark
is the registered trade mark of SST Automation.
Technical Support Contact Information
www.sstautomation.com
www.sstcomm.com
E-mail: sup[email protected]om

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Catalog
1 Product Overview ......................................................................................................................................................1
1.1 Product Function ............................................................................................................................................ 1
1.2 Feature ............................................................................................................................................................ 1
1.3 Technical specification ................................................................................................................................... 1
1.4 Revision History .............................................................................................................................................2
2 Hardware Description ................................................................................................................................................3
2.1 Appearance ..................................................................................................................................................... 3
2.2 LED Indicators ............................................................................................................................................... 4
2.3 Configuration Switch ..................................................................................................................................... 4
2.4 Interface ..........................................................................................................................................................5
2.4.1 Power Interface ................................................................................................................................... 5
2.4.2 Ethernet Interface ................................................................................................................................ 5
2.4.3 RS-485 Interface ................................................................................................................................. 2
3 Hardware Installation ................................................................................................................................................ 3
3.1 Mechanical Dimensions ................................................................................................................................. 3
3.2 Installation Method ........................................................................................................................................ 4
4 How to Start ...............................................................................................................................................................5
4.1 Connect to the Power ..................................................................................................................................... 5
4.2 Connect Serial Devices .................................................................................................................................. 5
4.3 Ethernet Connection .......................................................................................................................................6
4.4 Configuration Switch ..................................................................................................................................... 7
4.5 Installing Software ......................................................................................................................................... 7
5 Configuration Software ............................................................................................................................................. 8
5.1 Notes before Configuration ............................................................................................................................8
5.2 User Interface ................................................................................................................................................. 8
5.3 Operation of Devices view ...........................................................................................................................10
5.3.1 Devices View Interface ..................................................................................................................... 10
5.3.2 Operation Mode .................................................................................................................................10
5.3.3 Operation types ..................................................................................................................................11
5.4 Operation of Configuration View .................................................................................................................12
5.4.1 Ethernet Configuration ......................................................................................................................12
5.4.2 Subnet Configuration ........................................................................................................................ 12
5.4.3 Node Configuration ...........................................................................................................................14
5.4.4 Command Configuration ...................................................................................................................14
5.5 Conflict Detection ........................................................................................................................................ 15
5.5.1 Operation of Command List ............................................................................................................. 15
5.5.2 Operation of Memory Mapping Area ............................................................................................... 16
5.6 Hardware Communication ........................................................................................................................... 17
5.6.1 Ethernet Configuration ......................................................................................................................17
5.6.2 Upload ............................................................................................................................................... 18

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5.6.3 Download .......................................................................................................................................... 19
5.7 Load and Save Configuration .......................................................................................................................19
5.7.1 Load Configuration Project ...............................................................................................................19
5.7.2 Save Configuration Project ............................................................................................................... 20
5.8 Export Excel ................................................................................................................................................. 20
5.9 Debug ........................................................................................................................................................... 20
6 EtherNet/IP Connection Parameters ........................................................................................................................22
7 How to Read/Write I/O Data ...................................................................................................................................23
7.1 Read/Write Data by IO Messaging (Recommend) ...................................................................................... 23
7.2 Read/Write Data by MSG ............................................................................................................................ 27
7.2.1 Read Data .......................................................................................................................................... 27
7.2.2 Write Data ......................................................................................................................................... 31
8 Typical Application ................................................................................................................................................. 36
Appendix A: Upgrade to Modbus TCP Function .......................................................................................................37
A.1 How to Upgrade to Modbus TCP................................................................................................................37
A.2 Configuration ...............................................................................................................................................39
A.3 Restore to EtherNet/IP .................................................................................................................................40

User Manual
Modbus/EtherNet/IP Gateway
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1
1 Product Overview
1.1 Product Function
GT200-EI-2RS485 is a gateway which can exchange data between Modbus to EtherNet/IP protocol. The gateway
acts as the adapter at the EtherNet/IP side and the master at the Modbus side. If needed, user can also change the
EtherNet/IP to Modbus TCP function. Then, user can realize the Modbus to Modbus TCP conversion. More
details, please refer to Appendix A.
1.2 Feature
Redundant Power Supply
Two independent RS-485 interfaces 1KV photoelectric isolation
Ethernet 10/100M adaptive
IP address conflict detection
Modbus network debugging
Easy to use configuration software SST-GT-CFG
1.3 Technical specification
[1] EtherNet/IP network is independent with two Modbus subnet;
[2] Ethernet 10/100M adaptive;
[3] Support IP addresses conflict detection function;
[4] Support the ODVA Standard EtherNet/IP communication protocol;
[5] Two serial RS-485 ports, half-duplex, and baud rate support: 1200, 2400, 4800, 9600, 19200, 38400, 57600,
115200; parity mode support: none, odd, even, mark, space; 1 or 2 stop bits;
[6] GT200-EI-2RS485 acts as master at the side of Modbus network and supports 01H, 02H, 03H, 04H, 05H,
06H, 0FH, 10H function codes, can be configured up to 48 Modbus commands for each RS-485 interface;
Modbus function codes 03H, 04H, 06H and 10H support "Byte Swap" function, and it can help users solve

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the problem of data format between two different networks;
[7] Two independent RS-485 interfaces with 1KV optical isolation;
[8] The maximum number of input and output bytes of EtherNet/IP:
Maximum number of input bytes: 492Bytes
Maximum number of output bytes: 492Bytes
[9] Power supply: 24VDC (9V ~ 30V), 90mA (24VDC);
[10] Working temperature:-4℉~140℉(-20℃~ 60℃), relative humidity: 5% ~ 95% (no condensation);
[11] External dimensions (W*H*D): 1.33 in*4.56 in*4.21 in (34mm*116mm*107mm).
[12] Installation: 35mm DIN rail;
[13] Protection class: IP20;
[14] Test standard: EMC test standards.
1.4 Revision History
Revision
Date
Chapter
Description
V2.3
7/14/2017
ALL
New release
V2.3, Rev A
3/26/2021
ALL
Supports changing to
Modbus TCP function
V3.3
8/23/2022
PART
Updated the product
picture and dimensions

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2 Hardware Description
2.1 Appearance
Notes: This picture is for reference only. The product appearance is subject to the actual product.
Ethernet RJ-45 Interface
RS-485-I Interface
RS-485-II Interface
Configuration Switch
Dual Power Interface
LED Indicators

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2.2 LED Indicators
Indicator
State
Description
TX
Flashing
Sending Modbus data
OFF
No data transferring
RX
Flashing
Receiving Modbus data
OFF
No data transferring
ENS
Green
EtherNet/IP connection is established
Flashing Green
EtherNet/IP connection is not established
Red
IP address conflict
Flashing Red
EtherNet/IP connection timed out; DHCP, BOOTP , IP address conflict
detection
SNS
Green
Modbus Communication is normal
Red
At least one Modbus channel response timed out, exception or error
Flashing, red and green
alternately
At least parts of devices in a Modbus channel timed out, exception or
error
* Special States
Indicator
State
Description
ENS & SNS Orange
Light up together
The gateway is starting up
Flashing alternately
Configuration mode
2.3 Configuration Switch
Configuration switch is located on the bottom of the gateway, bit 1 is mode bit, bit 2 is function bit.
Off
On 1 2
Mode (Bit 1)
Function (Bit 2)
Description
Off
Off
Operation mode, allowed to upload/download configuration.
Off
On
Operation mode, not allowed to upload/download configuration.
On
Off
Configuration mode, IP address is fixed at 192.168.0.10. In this
mode, the gateway is allowed to upload/download configuration but
does not transfer data between EtherNet/IP and Modbus network.
Notes: If you changed the DIP switch, you have to restart GT200-EI-2RS485 (power off and power on) to make
the settings take effect.

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2.4 Interface
2.4.1 Power Interface
GT200-EI-2RS485 has two power interfaces, with power redundancy function, when one the way to power failure,
power can continue to supply the other way.
GND
NC
24V+
1
2
3
Pin
Function
1
GND,
2
NC, no connection
3
24V+ , DC
2.4.2 Ethernet Interface
Ethernet interface apply RJ-45 connector, 10/100M adaptive.
Pin
Signal Description
S1
TXD+, Tranceive Data+, Output
S2
TXD-, Tranceive Data-, Output
S3
RXD+, Receive Data+, Input
S4
Bi-directional Data+
S5
Bi-directional Data-
S6
RXD-, Receive Data-, Input
S7
Bi-directional Data+
S8
Bi-directional Data-

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2.4.3 RS-485 Interface
Serial interface uses 3-pin pluggable terminal and users can wire it according to the wiring instructions on the
panel.
B+
A-
GND
1
2
3
Pin
Function
1
B(+), RS-485
2
A(-), RS-485
3
GND

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3 Hardware Installation
3.1 Mechanical Dimensions
1.33in * 4.56in * 4.21in (34mm * 116mm * 107.4mm)

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3.2 Installation Method
Using 1.4 in (35mm) DIN RAIL.

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4 How to Start
4.1 Connect to the Power
DC 24V power supply, dual power supply interface, a redundant function, users can use one or two power supply.
If you are using two power supply, when the way in which the power fails, the other way you can continue to
supply power to ensure normal operation.
Power supply wiring as shown below:
GND
NC
24V+
1
2
3
GND
24V+
DC power: +24V Ⅰ
Power interface of gateway
GND
NC
24V+
1
2
3
GND
24V+
Optionally be connected
Must be connected
Power interface of gateway
(the other)
DC power: +24V Ⅱ
4.2 Connect Serial Devices
RS-485 connection as shown below:

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B+
A-
GND
1
2
3
485+
485-
RS-485 device
1
RS-485 interface
RS-485 device
2
RS-485 device
3
485+
485-
485+
485-
…
In order to prevent signal reflection and interference in RS-485 multipoint communication, adding one terminal
resistor at the both farthest ends of the line is necessary, and the argument is 120Ω 1/2W.
Notes: There is no internal termination resistor in the RS-485 interface of GT200-EI-2RS485.
4.3 Ethernet Connection
Connect the GT200-EI-2RS485 to your computer with the Ethernet cable, in the RJ-45 port.

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4.4 Configuration Switch
Configuration switches located on the bottom of the gateway, set the mode bit (bit 1) to 0 (Off), and set function
bit (bit 2) to 0 (Off), power (or restart) the device to work.
Mode (Bit 1)
Function (Bit 2)
Description
Off
Off
Operation mode, allowed to upload/download configuration.
Off
On
Operation mode, not allowed to upload/download configuration.
On
Off
Configuration mode, IP address is fixed at 192.168.0.10. In this
mode, the gateway is allowed to upload/download configuration but
does not transfer data between EtherNet/IP and Modbus network.
4.5 Installing Software
Double click the SST-GT-CFG software installation package and install the configuration software SST-GT-CFG,
you can easily follow the prompts to complete the installation. Then open the configuration software and finish
the configuration of GT200-EI-2RS485!
Notes: The network setting of GT200-EI-RS: IP address is 192.168.0.X, subnet mask is 255.255.255.0, gateway
address is 192.168.0.1.
If the Assign IP mode is DHCP, and there is no DHCP Server or you can’t search the GT200-EI-2RS485. You can
set mode bit (bit 1) to On, and restart GT200-EI-2RS485 (power off and power on), then the fixed IP address of
GT200-EI-2RS485 is 192.168.0.10, subnet mask is 255.255.255.0, gateway address is 192.168.0.1.
The serial factory setting is 19200, 8, N, 1.

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5 Configuration Software
5.1 Notes before Configuration
SST-GT-CFG is a product based on Windows platform, and used to configure GT200-EI-2RS485. It can set
related parameters and commands of Modbus and other bus.
The document mainly introduces the use method of GT200-EI-2RS485.
Double-click the icon to enter the main interface of the software:
5.2 User Interface
SST-GT-CFG interface include: title bar, menu bar, toolbar, status bar, equipment section, configuration section
and notes section.
Notes: All the gray part in the software can not be changed.

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Tool bar interface is shown as below:
New: Create a new configuration project.
Save: Save the configuration project.
Open: Open the configuration project.
Add Node: Add a Modbus slave node.
Delete Node: Delete a Modbus slave node.
Add Command: Add a Modbus command.
Delete Command: Delete a Modbus command.
Toolbar
Tree View
Menu Bar
Title Bar
Configuration Window
Comment Interface

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Upload: Read the configuration information from the module and shown in the software.
Download: Download the configuration file to the gateway.
AutoMap: Used to automatically calculate the mapped memory address without confliction by each
command.
Conflict Detection: To check whether there are conflicts with configured commands in the gateway
memory data buffer.
Export EXCEL: Export current configuration to the local hard disk, saved as .xls file.
Debug: Monitor or modify the gateway memory buffer data.
5.3 Operation of Devices view
5.3.1 Devices View Interface
5.3.2 Operation Mode
The equipment view supports three types of operation: Edit Menu, Edit Toolbar and Right click edit Menu.

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5.3.3 Operation types
1. Add nodes: Right click on subnet or existing nodes, and then perform the operation of adding a new node. Then
there is a new node named "new node" under subnet.
2. Delete nodes: Right click on the node to be deleted, and then perform the operation of deleting the node. The
node and its all commands will be deleted.
3. Add commands: Right click on the node, and then perform the operation of adding command to add a command
for the node. The dialog box will be shown as follow:
Currently, it supports the commands: 01, 02, 03, 04, 05, 06, 15 and 16.
Select the command: Double click the command
4. Delete commands: Right-click on the command and then perform the operation of deleting the command.

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5.4 Operation of Configuration View
5.4.1 Ethernet Configuration
In the interface of device view, click Ethernet, and then the configuration view is shown as follows:
Configurable items include: Assign IP Mode, IP Address, Subnet Mask, Gateway Address, DNS1, DNS2.
Assign IP Mode: Manual Assign, BOOTP, DHCP can be selected.
IP Address: Set the device IP address.
Subnet Mask: Set subnet mask of the device.
Gateway Address: Set gateway address.
DNS1: Set the device DNS1 address.
DNS2: Set the device DNS2 address.
5.4.2 Subnet Configuration
Protocol is Modbus master
Configurable parameters are shown as follows:
Baud Rate, Data Bits, Parity check mode, Stop bit, Transmission mode, Response timeout, Delay between polls,
Polling mode of outputting commands, Time between two continuous pluses (the polling mode of outputting
commands is pulse output), Scanning ratio
Interface of configuration view is shown as follow: