SST Automation GT200-HT-RS User manual

HART/ Modbus Serial Gateway
GT200-HT-RS
User Manual
V 2.3 REV B
SST Automation
E-mail: [e-mail]
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Catalog
1 Product Overview...................................................................................................................................................... 4
1.1 Product Function.............................................................................................................................................4
1.2 Product Features............................................................................................................................................. 4
1.3 Technical Specifications................................................................................................................................. 4
1.4 Safety and Explosion-Proof Features............................................................................................................. 5
1.5 Related Products............................................................................................................................................. 5
1.6 Revision History............................................................................................................................................. 5
2 Quick Start Guide...................................................................................................................................................... 6
2.1 Configuration of Gateway Parameters........................................................................................................... 6
2.1.1 Pre-configured Settings....................................................................................................................... 6
2.1.2 Software Configuration....................................................................................................................... 6
2.2 Function Demo............................................................................................................................................... 9
3 Hardware Descriptions.............................................................................................................................................11
3.1 Product Appearance...................................................................................................................................... 11
3.2 Indicators.......................................................................................................................................................12
3.3 DIP Switch/Button........................................................................................................................................12
3.3.1 DIP Switch.........................................................................................................................................12
3.3.2 Modbus Address Setting Button........................................................................................................13
3.3.3 Internal/External Sampling Resistor Switch..................................................................................... 13
3.4 Interface........................................................................................................................................................ 14
3.4.1 Power Interface..................................................................................................................................14
3.4.2 RS-485/RS-422 Interface.................................................................................................................. 14
3.4.3 RS-232 Interface................................................................................................................................15
3.4.4 HART Interface..................................................................................................................................16
3.4.5 Mini B Type USB.............................................................................................................................. 16
3.5 Topology of GT200-HT-RS and Fieldbus Devices...................................................................................... 17
4 Software Instructions............................................................................................................................................... 19
4.1 Software Interface Description.....................................................................................................................19
4.2 Software Functional Specifications..............................................................................................................21
4.2.1 Connect with the Hardware............................................................................................................... 21
4.2.2 Upload configuration.........................................................................................................................22
4.2.3 Configure the Fieldbus...................................................................................................................... 22
4.2.4 Configure the HART Fieldbus...........................................................................................................25
4.2.5 Conflict Detection..............................................................................................................................32
4.2.6 AutoMap............................................................................................................................................ 33
4.2.7 Download Configuration................................................................................................................... 33
4.2.8 Memory Data Display....................................................................................................................... 33
4.2.9 Diagnose............................................................................................................................................ 34

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4.2.10 Serial Debug.................................................................................................................................... 38
4.2.11 Switching Tools............................................................................................................................... 39
4.2.12 Use USB Port...................................................................................................................................40
5 Working Principle.................................................................................................................................................... 45
5.1 Flowchart of Executing One HART Command........................................................................................... 48
5.2 Universal Send and Receive Data................................................................................................................ 48
5.3 Trigger Command.........................................................................................................................................49
5.4 Data Exchange with Modbus........................................................................................................................50
6 Installation................................................................................................................................................................51
6.1 Machine Dimension......................................................................................................................................51
6.2 Installation Method.......................................................................................................................................51

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1 Product Overview
1.1 Product Function
GT200-HT-RS is a gateway that can provide a seamless connection between HART and Modbus. At HART
side it can be configured as a primary master or the secondary master, and acts as slave at the Modbus side.
1.2 Product Features
Powerful Serial function: Support the interconnection between HART and Modbus , also support transparent
transmission between HART and serial port.
Multi debugging functions: It can display the exchanging data, and diagnosis the HART command
1.3 Technical Specifications
[1] Used as a primary or a secondary HART master;
[2] Supports one HART-channel, under multi-point mode, support connecting at most 13 HART slaves with
gateway internal resistor and support connecting 15 HART slaves with an external resistor (250Ω);
[3] Supports single-point and multi-point mode at the HART side;
[4] Under single-point mode, support data burst operation;
[5] Supports all commands of the HART protocol;
[6] Each HART command can be configured for change-of-state output, polling output, initialization output or
disable output;
[7] Supports up to 128 HART commands, HART output data buffer is up to 1000 bytes, and the input data buffer
is up to 1600 bytes;
[8] Supports an internal or external HART sampling resistor;
[9] Supports serial RS-232, RS-485 and RS-422, baud rate supports: 300, 600, 1200, 2400, 4800, 9600, 19.2K,

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38.4K, 57.6K, 115.2Kbps;
[10] The serial port can be configured as Modbus slave, supports modbus function code: 03H, 04H, 06H, 10H;
[11] Modbus slave supports RTU and ASCII communication;
[12] The serial port can be configured as universal mode, and achieve transparent data transmission with HART
slave devices;
[13] Power: 24VDC (9V~30V), 80mA (24VDC);
[14] Working circumstance temperature: -4℉~140℉(-20℃~60℃), Humidity: 5%~ 95%;
[15] External dimensions (W*H*D): 0.98 in*3.94 in *3.54 in (25mm*100mm*90mm);
[16] Installation: 1.38 in (35mm) DIN RAIL;
[17] Protection Level: IP20;
1.4 Safety and Explosion-Proof Features
GT200-HT-RS is not the product with the features of safety and explosion-proof, please put it in the control
room when using.
1.5 Related Products
The related products include: GT200-HT-DP, GT200-DP-RS etc.
If you want to get more information about these products, please visit SSTCOMM website:
http://www.sstcomm.com.
1.6 Revision History
Revision
Date
Chapter
Description
REV A
21/9/2015
All
New software version
REV B
1/4/2016
All
Hardware Update

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2 Quick Start Guide
The following example introduces the use method of the Gateway.
2.1 Configuration of Gateway Parameters
2.1.1 Pre-configured Settings
1. Turn gateway’s configuration bit of DIP switch(refer to chapter 3.3.1) to “ON”;
2. Connect the Gateway’s RS-232/USB interface and the serial port of the computer with a serial cable, wiring
methods see chapter 3.4.3 of this manual;
3. Power on the gateway, the LED display shows “CF”, indicates that the gateway is in the configuration mode.
Run the SST-HT-CFG to start the gateway configuration.
2.1.2 Software Configuration
1. Run the SST-HT-CFG software installed on your computer.
2. Click “Fieldbus” in the tree view on the left, the configuration table is shown on the right as below:

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3. Click “HartChannel0” in the tree view on the left, the configuration table is shown on the right as below:
Note: HART protocol specifies that the slave device which address is 0 must work in single-point mode. In
single-point mode the digital communication and analog communication is allowed to exist at the same time. The
Slave with address 1~15 works in multi-point mode. In multi-point mode the analog output of the device is the
minimum value (e.g. 4mA), only allows digital communication. The protocol also specifies that the default factory
address of field device is 0.
4．Right-click HartChannel0, in the pop-up menu, select “Add Node”, as shown below:
5．Right-click “Node(0)”, in the pop-up menu selects “Add Command” to add a command (Command ID1) in
the dialog box, and then click OK to return.

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6．Click the “Command ID1”, the configuration table on the right is configured as below:
7．Click the tool , in the pop-up dialog box, select the serial port that gateway is connected to the computer,
click OK and then click Download data:

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2.2 Function Demo
HART interface of the gateway connects with a 2-wire pressure transmitter with slave address 0, RS-485
interface is connected to the computer through RS-485/RS-232 converter, and computer with configured Modbus
POLL software can simulate to work as a Modbus master, then in data exchange window you can see the main
variable value of the pressure transmitter:

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3 Hardware Descriptions
3.1 Product Appearance
Note: This picture is for reference only. Product appearance should refer to the real object.
HART Interface
LED Display
Power Interface
RS-485/RS-422
RS-232 Interface
DIP Switch
Serial State Indicator
HART State Indicator
Internal/External Sampling
Resistor Switch
Modbus Address Setting Button
Mini USB

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3.2 Indicators
Indicator location
Indicator
State
State Description
Row 1
TX
Blinking
Serial port data sending
OFF
No data is sending
RX
Blinking
Serial port data receiving
OFF
No data is receiving
Row 2
TX
Blinking
HART Bus data sending
OFF
No data is sending
RX
Blinking
HART Bus data receiving
OFF
No data is receiving
3.3 DIP Switch/Button
3.3.1 DIP Switch
The DIP switch is located at the bottom of product, bit 1 is the debug bit and bit 2 is the configuration bit.
Debugging (bit 1)
Configuration (bit 2)
Description
Off
Off
Run Mode
Off
On
Configuration Mode
On
Off
Debug Mode
On
On
Configuration Mode
Note: ①After re-configuring the switch, you have to restart the GT200-HT-RS to make the settings take
effect! (Power off then Power On)
②Set to the debug mode, it will be compulsory to appoint RS-485 interface as communication
interface, RS-232/USB interface as debugging interface.
③Configuration interface uses the RS-232/USB interface.
Off
On 1 2

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3.3.2 Modbus Address Setting Button
Under run mode of the GT200-HT-RS, LED display always displays the address of the current Modbus
address. Quickly press (double-click) the button twice in succession, the high bit starts to flash, and the low bit is
always on, click the button to add 1 to start setting the high bit of Modbus address. Long-press the button for 3
seconds, the high bit is always on, and the low bit starts to flash. Click the button to add 1 to start setting the low
bit of Modbus address. At last, long-press the button again for 3 seconds, the address flashing three times shows
that the address is set successfully. If no button action within ten seconds, GT200-HT-RS exits the status of setting
address and continue to display the original address. The configurable range of Modbus address is 0 to 99
(Decimal).
3.3.3 Internal/External Sampling Resistor Switch
GT200-HT-RS can choose using the internal sampling resistor or external sampling resistor to get the HART
signal. The specification of the internal resistor is 270Ω, 2W. When the power of the sampling resistor is more
than 2W, you must use an external resistor.
Switch to ON, using the internal
sampling resistor
Switch to OFF, using the external
sampling resistor

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3.4 Interface
3.4.1 Power Interface
GND
NC
24V+
1
2
3
Pin
Function
1
Power GND
2
NC(Not Connected)
3
24V+, DC Positive 24V
3.4.2 RS-485/RS-422 Interface
The RS-485 interface of GT200-HT-RS is a standard one, and the RS-485 characteristics of the product are
shown as follows:
1. The basic characteristics of RS-485 transmission technology
①Network topology: Linear bus, there are active bus terminal resistors at both sides.
②Transmission rate: 1200 bps~115.2Kbps.
③Media: Shielded twisted-pair cable and also can cancel the shielding, depending on environmental
conditions (EMC).
④Site number: 32 stations per subsection (without repeater), and can increase up to 127 stations (with
repeater).
⑤Plug connection: 3/5-pin pluggable terminal.
2. The main points on the installation of RS-485 transmission equipment
①All the equipment are connected with RS-485 bus;

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②Each subsection can be connected up to 32 sites;
③The farthest two end of the bus has a terminal resistor—120Ω 1/2W to ensure reliable operation of the
network.
Serial interface uses 5-pin pluggable open terminal and user can wire it according to the wiring instructions
on the panel.
5-pin terminal:
GND
D-
D+
1
2
3
4
5
R-
R+
Pin
Function
1
R-, RS-422 Receive Negative
2
R+, RS-422 Receive Positive
3
GND
4
D-, RS-485/RS-422 Transmit Negative
5
D+, RS-485/RS-422Transmit Positive
3.4.3 RS-232 Interface
RS-232 interface uses one 3-pin pluggable open terminal, and its pin description is shown as follows:
RX
TX
GND
1
2
3

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Pin
Function
1
RX, Connect RS-232's RX of user device
2
TX, Connect RS-232's TX of user device
3
GND, Connect RS-232's GND of user
device
3.4.4 HART Interface
Pin
Function
1
Connect HART signal positive
2
Connect HART signal negative
3
NC
3.4.5 Mini B Type USB
Mini B type USB interface is defined as below:
Pin
Name
Function
1
VBUS
+5V
2
D-
Data negative
3
D+
Data positive
4
IN
NC
5
GND
Signal Ground

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3.5 Topology of GT200-HT-RS and Fieldbus Devices

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Note: 1. Some HART slave instrument need to perform self-test and other internal work when power is on, they
may not start HART communication, then gateway cannot receive the response data of the instrument right now. It
is recommended the HART slave instrument and gateway uses separate power supply so that the gateway can
immediately establish communication with instrument.
2. When configuring HART commands in the software SST-HT-CFG, the commands need to be
configured according to the actual demands. To improve the speed of bus communication, it is recommended not
to configure the empty node (in fact, not connected to the node) and empty commands (the actual unnecessary
commands).

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4 Software Instructions
4.1 Software Interface Description
SST-HT-CFG is configuring software based on Windows platform, and used to configure HART series
products.
The following describes how to use the software SST-HT-CFG to configure the product GT200-HT-RS. You
may also check the software user manual to get detailed usage.
Double-click on the icon to enter the main interface of software:
Tool Bar:
Toolbar interface shown as follow:
Network Settings interface:
Contains Fieldbus and the
connection object
Menu Bar
Tool Bar
Title Bar
Parameter Settings interface:
Contains modifiable part
(white) and unmodifiable part
(grey)
Comment field: Explain
the function of the
configuration options

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The function from left to right is: New, Save, Open, AddNode, DelNode, AddCmd, DelCmd, Upload,
Download, AutoMap, Conflict, Export, Memory, Diagnose and Debug.
New: Create a new configuration file
Save:Save the configuration file
Open: Open the configuration file
AddNode: Add a HART slave node
DelNode: Delete a HART slave node
AddCmd: Add a HART command
DelCmd: Delete a HART command
Upload: Read the configuration information from the module and shown in the software
Download: Download the configuration file to the gateway