SST Automation GT200-HT-MT User manual

HART / Modbus TCP Gateway
GT200-HT-MT
User Manual
V 1.2
Rev G
SST Automation
Email: [email protected]
www.SSTAutomation.com

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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
Email: [e-mail]

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Catalog
1 Product Overview ......................................................................................................................................................1
1.1 Product Function ............................................................................................................................................ 1
1.2 Product Features .............................................................................................................................................1
1.3 Technical Specifications .................................................................................................................................1
1.4 Related Products .............................................................................................................................................2
1.5 Revision History .............................................................................................................................................3
2 Hardware Descriptions .............................................................................................................................................. 4
2.1 Product Appearance ........................................................................................................................................4
2.2 LED Indicators ............................................................................................................................................... 5
2.3 Configuration Switch/Button ......................................................................................................................... 5
2.3.1 Configuration Switch .......................................................................................................................... 5
2.3.2 Resistor Switch ....................................................................................................................................6
2.4 Interface ..........................................................................................................................................................6
2.4.1 Power Interface ................................................................................................................................... 6
2.4.2 Ethernet Interface ................................................................................................................................ 7
2.4.3 HART Interface ................................................................................................................................... 7
2.5 Topology of GT200-HT-MT and HART Instruments ....................................................................................8
2.5.1 Point-to-Point Wiring .......................................................................................................................... 9
2.5.2 Multi-Drop Wiring ............................................................................................................................ 11
3 Hardware Installation .............................................................................................................................................. 12
3.1 Mechanical Dimensions ............................................................................................................................... 12
3.2 Mounting Method .........................................................................................................................................13
4 Quick Start Guide ....................................................................................................................................................14
4.1 Start ...............................................................................................................................................................14
4.1.1 Connection ........................................................................................................................................ 14
4.1.2 Default Configuration ....................................................................................................................... 14
4.1.3 Configuration .................................................................................................................................... 16
4.2 Communication with Modbus TCP Client ...................................................................................................20
4.3 Troubleshooting Multiple HART Devices ................................................................................................... 25
4.3.1 Identifying HART Slave Addresses .................................................................................................. 25
4.3.2 Changing HART Slave Addresses .................................................................................................... 34
4.4 Common HART Commands ........................................................................................................................ 39
5 Software Instructions ...............................................................................................................................................44
5.1 Software Interface Description .................................................................................................................... 44
5.2 Software Functional Specifications ............................................................................................................. 47
5.2.1 Configure the Modbus TCP Fieldbus ............................................................................................... 47
5.2.2 Configure the HART Fieldbus .......................................................................................................... 48
5.2.3 Conflict Detection ............................................................................................................................. 55
5.2.4 Auto Mapping ....................................................................................................................................56

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5.2.5 Upload Configuration ........................................................................................................................57
5.2.6 Download Configuration ...................................................................................................................59
5.2.7 Memory Data Display ....................................................................................................................... 59
5.2.8 Diagnose ............................................................................................................................................61
5.2.9 Conversion Tools ...............................................................................................................................65
6 Working Principle ....................................................................................................................................................66
6.1 Address Table ............................................................................................................................................... 66
6.2 Flowchart of Executing One HART Command ...........................................................................................69
6.3 Trigger Command ........................................................................................................................................ 69

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1 Product Overview
1.1 Product Function
GT200-HT-MT is a gateway that can provide a seamless connection between HART instruments and a Modbus
TCP network. It can connect HART slave devices to a Modbus TCP network and realize bi-directional data
exchange easily. The HART interface can be configured as a primary master or a secondary master. It acts as a
server at the Modbus TCP side.
1.2 Product Features
Easy to use: The GT200-HT-MT can achieve seamless data communication following simple steps. Users
only need to refer to the product manual and application instances and can realize data communication of a
gateway in a short time according to the requirements of the configuration.
Powerful functionality: Support fast acquisition of the HART slave address and modification, single-point
mode of coexistence of HART communication and 4~20mA data acquisition, HART side supports the
primary master and the secondary master.
Easy-to-use configuration software: The GT200-HT-MT can be configured by SST-HE-CFG software easily.
Multi debugging functions: The configuration software SST-HE-CFG can provide a visual display of data
exchange as well as HART command diagnostics and communication debugging functions that greatly
facilitate user communication tests.
1.3 Technical Specifications
[1] The HART interface can be configured as a primary master or the secondary master.
[2] The HART interface supports point-to-point mode and multi-drop mode.
[3] Supports one HART channel.
In point-to-point mode, the GT200-HT-MT supports burst communication.

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In multi-drop mode, up to 13 HART instruments can be connected with an internal series resistor
(270Ohm/2W), and up to 15 HART instruments with an external series resistor (250Ohm/3W).
[4] Supports all commands of the HART 6 protocol.
[5] Each HART command can be configured to different outputting mode: change-of-state output, polling output,
initialization output or disable output.
[6] Supports up to 100 HART commands. Max output data: 2000 bytes, max input data: 3000 bytes.
[7] Ethernet 10/100M adaptive routing. Supports IP address conflict detection and automatic routing functions.
[8] Supports connection with up to 36 Modbus TCP clients and 512 requests simultaneously.
[9] The Ethernet interface can be configured as a Modbus TCP server, supporting function codes:03H, 04H, 06H,
10H.
[10] Power supply: 24VDC (11V~30V), <100mA (24VDC).
[11] Working temperature: -4°F~140°F(-20°C~60°C). Rel Humidity: 5%~ 95% (non-condensing).
[12] Dimensions(W*H*D): 1.6 in*5.0 in*4.4 in (40mm*125mm*110mm).
[13] Installation: 1.38 in (35mm) DIN RAIL.
[14] Protection Level: IP20.
1.4 Related Products
Related products include:
GT200-HT-RS
GT200-3HT-RS
GT200-3HT-MT
GT200-HT-EI
GT200-HT-DP
GT200-MT-2RS
GT200-MT-2RS485
If you want to get more information about related products, please visit SSTCOMM website:
www.sstautomation.com.

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1.5 Revision History
Revision
Date
Chapter
Description
V1.2, Rev A
02/11/2017
ALL
Add description for chapter 4.2.7,
4.2.8.
V1.2, Rev B
11/16/2020
ALL
V1.2, Rev C
12/25/2020
Chapter 5
V1.2, Rev D
7/23/2021
Chapter 4, 6
New chapter 4.2. Address table
revised.
V1.2, Rev E
07/01/2022
Chapter 5.2.2.3
Add HART Common Commands (ID
1 and ID 3) to this section
V1.2, Rev F
08/12/2022
Chapter 1.1, 1.2, 1.3,
1.4, 2.3.1, 2.3.2, 2.5,
2.5.1, 4.1.1, 4.1.2, 4.2,
5.1, 5.2.1, 5.2.2.1,
5.2.2.2, 5.2.2.3,
5.2.2.4, 5.2.2.5,
5.2.2.6, 5.2.2.7, 5.2.3,
5.2.4, 5.2.5, 5.2.7,
5.2.8, 5.2.9, 6.1
Revised some mistakes. Corrected
figure in chapter 2.3.2. Added two
wire and four wire multi-drop wiring
in chapter 2.5.1. Updated software
configuration screenshot.
V1.2, Rev G
09/16/2022
Chapter 2.5.1, 2.5.2,
4.3, 4.4, 5.2.2.3
Added troubleshooting steps for
multiple HART devices in chapter 4.3.
Added list of HART commands in
chapter 4.4 and moved content from
chapter 5.2.2.3. Moved Multi-Drop
Wiring to chapter 2.5.2 and added
Point-to-Point Wiring in chapter 2.5.1.

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2 Hardware Descriptions
2.1 Product Appearance
Note: This picture is for reference only. The product appearance is subject to the actual product.
HART Interface
Power Interface
DIP Switch
Resistor Switch
Ethernet interface
HART Indicators
Ethernet Indicators

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2.2 LED Indicators
LED
State
Description
TX
Flashing
HART channel is sending data
OFF
No data sending
RX
Flashing
HART channel is receiving data
OFF
No data is received
NS
OFF
Communication error in Modbus TCP network
Flashing
Communication running
MS
Red
IP address conflicts
Red, flashing
Connection is OFF / Configuration Mode / DHCP,
BOOTP, IP address conflict detection
Red, flashing
(For 3 seconds)
Connection is OFF
2.3 Configuration Switch/Button
2.3.1 Configuration Switch
The configuration DIP switches are located at the bottom of the GT200-HT-MT and are used to set the operating
mode of the device.
Mode (Bit 1)
Function (Bit 2)
Description
Off
Off
Running mode, configuration enable
Off
On
Running mode, configuration disable
On
Off
Configuration mode, IP is fixed at
192.168.0.10
On
On
Reserved
Note: To apply mode switching, restart the gateway.
Off
On 1 2

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2.3.2 Resistor Switch
The GT200-HT-MT has an internal series (270Ohm/2W) resistor required for the HART channel. This supports up
to 13 HART instruments to be connected.
When the power of the series resistor is more than 2W, you must use an external series resistor (250Ohm/3W),
which allows the gateway to support up to 15 HART instruments to be connected.
Switch to ON, using the internal series resistor
Switch to OFF, using the external series resistor
2.4 Interface
2.4.1 Power Interface
GND
NC
24V+
1
2
3
Pin
Description
1
Power ground
2
Not connected
3
+24V DC

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2.4.2 Ethernet Interface
The Ethernet interface uses RJ45 interface, follows the IEEE802.3u 100BASE-T standard, 10/100M adaptive
routing. its pin (standard Ethernet signal) is defined as below:
2.4.3 HART Interface
1
2
3
HART LOOP+
HART LOOP-
NC
Signal
Description
HART LOOP+
Connected to HART signal+
HART LOOP-
Connected to HART signal-
NC
Not connected
Pin
Description
S1
TXD+, Transmit Data+, Output
S2
TXD-, Transmit 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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2.5 Topology of GT200-HT-MT and HART Instruments
Notes:
1. It is recommended to use a separate power supply for the HART instruments and the GT200-HT-MT to
ensure stable communication.
2. To improve the communication efficiency of the field bus, it is recommended not to configure empty nodes
or unnecessary commands in the SST-HE-CFG software.
3. If there are two or more HART instruments connected in the same network, their HART LOOP wires should
be connected in parallel with each other.

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2.5.1 Point-to-Point Wiring
The following are the topologies for two wire and four wire point-to-point wiring.

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2.5.2 Multi-Drop Wiring
The following are the topologies for two wire and four wire multi-drop wiring.
Two wire:
Four wire:

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3 Hardware Installation
3.1 Mechanical Dimensions
Size: 1.6 in (width) *5.0 in (height) *4.4 in (depth)

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3.2 Mounting Method
Using 1.38 in (35mm) DIN RAIL.
Install the gateway
Uninstall the gateway
1. Use a screwdriver to pass through the DIN RAIL bar, pull down and hold.
2. Pull out the gateway.
3. Lift up the gateway.
①
②
③

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4 Quick Start Guide
4.1 Start
4.1.1 Connection
1. Make sure the GT200-HT-MT is in the appropriate operating mode that allows for configuration. It is
recommended to set the gateway to configuration mode (configuration switches Bit 1 ON and Bit 2 OFF)
then the IP of the gateway will be fixed at 192.168.0.10.
2. Connect the GT200-HT-MT to the computer by Ethernet cable.
3. Connect the HART instruments and the power supply. Refer to the topology displayed in chapter 2.5.
4. Power on the gateway and run the SST-HE-CFG software to start the configuration process.
4.1.2 Default Configuration
1. Open the SST-HE-CFG software installed on your computer.
2. Click “Upload” and “Sign In” to the gateway.

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3. You will see the factory default configuration settings are shown below:
Note: There are already two commands and an IP Address preset into the device. You can edit these parameters
for your needs.
Command ID1 is pre-configured to read the PV. (For your reference, the default configuration for this command is
shown below.)
Command ID3 is pre-configured to read the PV, SV, TV, and QV. (For your reference, the default configuration for
this command is shown below.)

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4.1.3 Configuration
1. Open the SST-HE-CFG software installed on your computer.
2. Click “Fieldbus” in the “Mode” item on the right and choose “Modbus TCP”.
3. Select “Ethernet Config” in “Config” menu.