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Device Modbus - Protocol Properties

Device Modbus defines the following Protocol Properties for Modbus-TCP, Modbus-RTU and Modbus-ASCII.

  • Modbus TCP Device
    • These properties reside under the modbus-tcp key in the protocols section of each device definition.
Property Description
Address The IP address or host name of Modbus TCP
Port The port used for communication across Modbus TCP
UnitID The Modbus station or slave identifier
Timeout The timeout when connecting or reading Device Modbus Service to device-modbus
IdleTimeout Idle timeout(seconds) to close the connection

Example Modbus TCP Protocol Properties

"protocols": {
  "modbus-tcp": {
    "Address": "172.17.0.1",
    "Port": "1502",
    "UnitID": "1"
}}
  • Modbus RTU Device
    • These properties reside under the modbus-rtu key in the protocols section of each device definition.
Property Description
Address The IP address or host name of Modbus RTU
UnitID The Modbus station or slave identifier
BaudRate The baud rate for a serial device, which must match for devices using the same address
DataBits The number of bits of data
StopBits The number of stop bits
Parity The parity value: N for no parity /E for even parity/ O for odd parity
Timeout The timeout when connecting or reading Device Modbus Service to device-modbus
IdleTimeout Idle timeout(seconds) to close the connection

Example Modbus RTU Protocol Properties

"protocols": {
  "modbus-rtu": {
    "Address": "/dev/virtualport",
    "BaudRate": "19200",
    "DataBits": "8",
    "Parity": "N",
    "StopBits": "1",
    "UnitID": "1"
}}
  • Modbus ASCII Device
  • These properties reside under the modbus-ascii key in the protocols section of each device definition.
Property Description
Address The IP address or host name of Modbus ASCII
UnitID The Modbus station or slave identifier
BaudRate The baud rate for a serial device, which must match for devices using the same address
DataBits The number of bits of data
StopBits The number of stop bits
Parity The parity value: N for no parity /E for even parity/ O for odd parity
Timeout The timeout when connecting or reading Device Modbus Service to device-modbus
IdleTimeout Idle timeout(seconds) to close the connection

Example Modbus ASCII Protocol Properties

"protocols": {
  "modbus-ascii": {
    "Address": "/dev/virtualport",
    "BaudRate": "19200",
    "DataBits": "8",
    "Parity": "N",
    "StopBits": "1",
    "UnitID": "1"
}}