Configuring Fields: Modbus
When a gateway is running Edge Lite and connected to a Zoho IoT application, you can remotely push configurations for devices that communicate to the gateway using the Modbus protocol. Based on the Modbus communication type, the application provides different fields for configuration.
Modbus RTU
If the communication is via Modbus RTU, you can configure the RS485 port settings and Modbus registry mapping of the connected Modbus device along with the following details.
RS485 Port Settings
Serial Port Name | Identifies the physical or virtual serial port used by the gateway. |
Baud Rate | Defines the communication speed between the gateway and Modbus devices, commonly 9600, 19200, or 115200 bps. Both gateway and Modbus device must use the same baud rate. |
Parity | Adds an error-checking mechanism. |
Data Bit | Number of data bits transmitted per character. |
Stop Bit | Indicates the end of a character. Usually 1 or 2 stops bits, depending on the device requirements. |
Device Details
Product | The device product representing the peripheral device. The Modbus registry mapping of this device product will be sent to the gateway. |
Name | An tag to identify the Modbus device. |
Slave ID | The unique Modbus address of the Modbus device. This ensures the gateway communicates with the correct device on the RS485 bus. |
Edge Key | A unique key used to identify data from the correct device in the JSON payload. The parameter value for the selected modbus device is appended under this edge key in the payload. |
Timeout | The maximum time, in milliseconds, the gateway waits for a response from the device before considering the request failed. |
Serial Port
Device | Port |
TRB145 | dev/ttyHS0 |
TRB245 | dev/ttyUSB0 |
TRB246 | dev/ttyS1 |
TRB255 | dev/ttyUSB0 |
RUT956 | dev/ttyS1 |
AG207 | dev/ttyUSB1 |
AG702 | dev/ttyUSB1 |
Modbus TCP & Modbus RTU over TCP
If the communication is via Modbus TCP or Modbus RTU over TCP, you can configure the Modbus registry mapping of the connected Modbus device and the following details.
Product | The device product representing the peripheral device. The Modbus registry mapping of this device product will be sent to the gateway. |
Name | An tag to identify the Modbus device. |
Slave ID | The unique Modbus address of the Modbus device. This ensures the gateway communicates with the correct device on the network. |
IP Address | The network address of the Modbus device. This allows the gateway to locate and connect to the device over TCP/IP. It must match the static or assigned IP of the peripheral device. |
Port | The communication port number on which the Modbus device is listening. |
Edge Key | A unique key used to identify data from the correct device in the JSON payload. The parameter value for the selected modbus device is appended under this edge key in the payload. |
Timeout | The maximum time, in milliseconds, the gateway waits for a response from the device before considering the request failed. |
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