SST Automation GT200-BM-RS User manual

Modbus / BACnet IP Gateway
GT200-BM-RS/2RS
User Manual
V 1.5
SST Automation
E-mail: [e-mail]
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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
E-mail: [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 Revision History .............................................................................................................................................2
2 Hardware Descriptions .............................................................................................................................................. 3
2.1 Product Appearance ........................................................................................................................................3
2.2 LED Indicators ............................................................................................................................................... 4
2.3 Configuration Switch ..................................................................................................................................... 4
2.4 Interfaces ........................................................................................................................................................ 5
2.4.1 Power Interface ................................................................................................................................... 5
2.4.2 Ethernet Interface ................................................................................................................................ 5
2.4.3 RS-485 Interface ................................................................................................................................. 6
3 Hardware Installation ................................................................................................................................................ 7
3.1 Mechanical Dimension ...................................................................................................................................7
3.2 Installation Method ........................................................................................................................................ 9
4 How to Start .............................................................................................................................................................10
4.1 Hardware Connection ...................................................................................................................................10
4.2 Software Configuration ................................................................................................................................ 11
5 Software Instructions ...............................................................................................................................................12
5.1 Notes before Configuration ..........................................................................................................................12
5.2 Search Equipment ........................................................................................................................................ 13
5.2.1 Search All Equipment of Ethernet .................................................................................................... 13
5.2.2 IP Search ............................................................................................................................................13
5.3 Configuration ................................................................................................................................................14
5.3.1 Configure Ethernet Parameters ......................................................................................................... 15
5.3.2 Configure Serial and Modbus Parameters ........................................................................................ 16
5.3.3 Command Configuration ...................................................................................................................18
5.4 Locate ........................................................................................................................................................... 20
5.5 Remote Reset ................................................................................................................................................21
5.6 Open and Save Configuration ...................................................................................................................... 22
6 Typical Application ................................................................................................................................................. 24

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1 Product Overview
1.1 Product Function
GT200-BM Series gateways can exchange data between Modbus RTU to the BACnet IP. The GT200-BM series
gateways act as the server at BACnet IP side and the master at Modbus side.
GT200-BM Series include two gateways:
SKU
Number of Serial Interfaces
GT200-BM-RS
One RS-485 interface
GT200-BM-2RS
Two RS-485 interfaces
Note: This manual applies to GT200-BM-2RS of V1.4/1.5 and GT200-BM-RS of V1.4/1.5.
1.2 Product Features
Redundant power supply.
RS485 interface(s) with 1KV optical isolation.
Ethernet 10/100M adaptive.
Network security settings.
Network scanning and online/offline configuration.
Modbus command has auto demotion function and error handling functions.
Easy-to-use configuration software SST-BM-CFG.
1.3 Technical Specifications
[1] Data communication between BACnet IP and Modbus RTU.
[2] Ethernet 10/100M adaptive.
[3] Supports up to 500 BACnet BIs, 300 BOs, 300 BVs, 500 AIs, 300AOs, 300 AVs, 500 MSIs and 100MSOs,
and maximum number of BACnet IP objects is 1264.
[4] Supported BACnet IP services: Who Is, I Am, Who Has, I Have, Read Property, Write Property, Read
Property Multiple.

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[5] Supports up to 100 Modbus commands in each serial interface. Supported Modbus function code: 01, 02, 03,
04, 05, 06, 15, 16.
[6] RS-485 serial interface(s) of half-duplex. Supported baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600
and 115200 bps. Parity: none, odd, even, mark, space. Stop bits: 1 or 2.
[7] 1KV optical isolation in RS-485 interface.
[8] Power supply: 24VDC (11V ~ 30V), 90mA (24VDC).
[9] Operating temperature: -4°F to 140°F (-20ºC to 60 ºC), relative humidity: 5% ~ 95% (non-condensing).
[10] External dimension (W*H*D):
GT200-BM-2RS: 1.33in*4.56in*4.21in (34mm*116mm*107mm).
GT200-BM-RS: 1.6 in*5.0in*4.4in (40 mm*125mm*110mm).
[11] Installation: 35mm DIN rail.
[12] Protection class: IP20.
[13] Test standard: EMC test standards.
1.4 Revision History
Revision
Date
Chapter
Description
V1.5
8/2/2021
All
New release as universal manual for
GT200-BM-RS and GT200-BM-2RS.

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2 Hardware Descriptions
2.1 Product Appearance
GT200-BM-RS
GT200-BM-2RS
Note: This picture is for reference only. The product appearance is subject to the actual product.
Serial II Indicators
Ethernet Indicators
RS-485 Interface I
Ethernet Interface
Configuration Switch
Dual Power Interfaces
Dual Power Interfaces
Serial I Indicators
Serial II Indicators
Ethernet Indicators
RS-485 Interface I
RS-485 Interface II
Configuration Switch
Ethernet Interface

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2.2 LED Indicators
Indicators
State
Description
ENS
Green On
IP address with no confliction
Red On
IP address with confliction
Red Blinking
DHCP, BOOTP, IP address conflict detection
SNS
Green On
BACnet IP interface data is received or transmitted
Green Blinking
BACnet IP interface data is not received or transmitted
ENS&SNS
(Orange)
Simultaneously On
At the power
Blink Alternately
Configuration Mode
Blink Alternately
(for 3 seconds)
Use locating function
Serial I/II TX
Green Blinking
Serial data sending
OFF
No serial data is sending
Serial I/II RX
Green Blinking
Serial data receiving
OFF
No serial data is receiving
2.3 Configuration Switch
Configuration switch is located on the bottom of the gateway, bit 1 is mode bit, and bit 2 is function bit.
Off
On 1 2
Mode
(Bit 1)
Function
(Bit 2)
Mode
Description
Off
Off
Run mode
Allows configuration and communication.
Off
On
Run mode
Allows communication. Prohibit configuration.
On
Off or On
Configuration
mode
IP address is fixed at 192.168.0.188. Allows
configuration. Prohibit communication.
Note: To apply mode switching, please restart the gateway.

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2.4 Interfaces
2.4.1 Power Interface
Two power interfaces with a power redundancy function. When one of the power supplies lose power, the other
power supply will continuously power the gateway.
GND
NC
24V+
1
2
3
Pin
Description
1
GND
2
NC (Not Connected)
3
24V+, DC
Notes: Connecting the second power supply is optional as it offers redundancy.
2.4.2 Ethernet Interface
Ethernet interface is a RJ-45 connector, 10/100M adaptive.
Pin
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
GT200-BM series support standard RS-485 interface
B+
A-
GND
1
2
3
Pin
Description
1
B+, connected to RS-485 D+
2
A-, connected to RS-485 D-
3
GND
Note:
When communicating in RS485 interfaces, in order to prevent the reflection and interference of the signal, it’s
recommended to connect a terminal resistor (120Ohm, 1/2W) parallel with the communication wires at both
farthest ends of the network. The GT200-BM series gateways do not have the terminal resistor.

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3 Hardware Installation
3.1 Mechanical Dimension
Size (width * height * depth):
GT200-BM-2RS Size: 1.33in * 4.56in * 4.21in (34mm * 116mm * 107.4mm)

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GT200-BM-RS size: 1.6 in * 5.0 in * 4.4 in (40 mm * 125 mm * 110 mm)

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3.2 Installation Method
Using 1.38 in (35 mm) 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 How to Start
4.1 Hardware Connection
1. Connect the power to the power supply.
Please do not power on the devices before finishing and confirming all the connections.
Optional: Connect power supply II for backup redundancy.
2. Connect Modbus serial devices using the RS-485 interfaces.
D+
D-
GND
1
2
3
485+
485-
RS485 device
RS485 interface
RS485 device
RS485 device
485+
485-
485+
485-
…
3. Connect the GT200-BM series gateway with your computer via Ethernet cable.

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4. With the configuration switches located on the bottom of the gateway, set both Bit 1 and Bit 2 to 0 (OFF).
5. Power on the GT200-BM gateway.
4.2 Software Configuration
Download, install, and run the configuration software, SST-BM-CFG. For more details, see Chapter 5 of the
manual.
1. Upload the setting from the gateway by clicking “Search Equipment” on the left. Find the GT200-BM
gateway on the list, click it and click “Configuration” on the left.
Note: If you cannot find the GT200-BM gateway, check your Hardware configuration or your network
configuration, referring to the note How to Use the Ping Command.
This is a default configuration created by SST Automation. If you would like to create a configuration from
the beginning simply click “New”.
2. Click “BACnet IP Server” under the Device Window and configure the settings to your needs under the
Configuration Window.
3. Click the"Modbus Master” of choice under the Device window to configure the Modbus Master. (User
Manual 5.3.2)
4. To add a node, right click the Modbus Master you wish to add the node to and proceed to click the “Add
Node” operation.
Then configure the node. (User Manual 5.3.3)
5. To add a command, right click the node you wish to add the command to and proceed to click the “Add
Command” operation. Double click on the commands you wish to add to the Node.
Configure the command (User Manual 5.3.3)
6. Once configuration is complete, click “Download” to download your configuration into GT200-BM gateway.
Note: To reset GT200-BM gateway, you can either disconnect it from power or remotely reset it in the
SST-BM-CFG software: select it, and select Remote Reset.
7. Test the communication.

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5 Software Instructions
Double click the software application and install the configuration software SST-BM-CFG. Follow the prompts to
complete the installation, then open the installed configuration software and begin to configure the GT200-BM
gateway.
Note: The factory network setting of GT200-BM gateway is DHCP. If your network does not have the DHCP
server, the configuration switch (Bit 1) should be set to configuration mode (1-ON) and restart GT200-BM
gateway. Then the IP address of GT200-BM gateway is fixed at 192.168.0.188, the subnet mask is
255.255.255.0 and the gateway address is 192.168.0.1.
5.1 Notes before Configuration
SST-BM-CFG is a product based on Windows platform, and used to configure parameters of GT200-BM-RS and
GT200-BM-2RS gateways.
Please make sure the user's computer and the GT200-BM gateways are in the same network segment before you
run the software.
Double click the icon to access the main interface:

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5.2 Search Equipment
Before configuring parameters, the user will need to search for the gateway using the software. The software
provides two ways to search the gateway for the user.
5.2.1 Search All Equipment of Ethernet
Click "Search equipment" button of the main interface and the software will search all of the available devices and
list them in the main interface.
5.2.2 IP Search
Click "IP Search" button of the main interface will pop up a dialog box, and user need to enter the IP address of
the equipment.

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After entering the correct IP address, the software will search GT200-BM gateway with this IP address in the
network, and list the information of the equipment in the main interface.
Note: If the users select the "IP search", users need to enter correct IP address or it will not get any devices.
5.3 Configuration
Select the equipment to be configured in the list, and the function like "Locate", "Configuration", "Remote Reset",
"Import" and "Export" will become available:

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Click "Configuration" button will pop up the window:
5.3.1 Configure Ethernet Parameters
Note: The gray parts cannot be changed.
Ethernet parameters include: "Device Name", "Assign IP Mode", "IP Address", "Subnet Mask", "Default
Gateway", "DNS1", "DNS2".

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Device Name: Enter a name used to identify the device in order to distinguish from other devices. Note: The
name cannot have spaces, up to 16 characters.
Assign IP Mode: Set the IP address assign mode of the device.
IP address: Set the IP address of the device.
Subnet Mask: Set the subnet mask of the device.
Default Gateway: Set the gateway address for the device.
DNS1: The first domain name server ( LAN cannot set ).
DNS2: Standby domain name server.
Byte Swap: Currently not supported.
BACnet IP port: Set the BACnet IP port number of GT200-BM gateway.
Device Instance: Set device instance number GT200-BM gateway.
5.3.2 Configure Serial and Modbus Parameters
Serial parameters include: "Baud Rate", "Check Bit", "Stop Bits" and "Data Bits" etc.

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Baud Rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400.
Data Bits: 8 (currently only support 8 data bits).
Check Bit: None, Odd, Even, Mark, Space.
Stop Bits: 1, 2.
Transmission mode: RTU.
Response timeout: When the Modbus master send commands, the time waiting for response from the slave, the
range is 300~60000ms.
Delay between polls: After one Modbus command has been sent and has received correct response, the delay
time before next command being sent, the range is: 0 ~ 2500ms.
Output Mode: Modbus write command (command output) has two output modes: cycle and change of value
output.
Change of Value: When the output data has changed, it outputs the write command and stop outputting after
receiving correct response.
Cycle: the same with Modbus read command output mode, and output according to the scan rate.
Scan rate: Ratio of slow scan cycle to fast scan cycle.
Enable Auto Demotion: Default value is Disable. When Enable Auto Demotion and a command is a fast scan
command without correct response for N times, then the command will demote a slow scan command. This
parameter is valid for Modbus reading command and cycle writing command.
Auto demotion: After n times Modbus command response failure to automatically degrade to slow scan.