Edge Gateway Modbus Adapter
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Edge Gateway Home > Modbus Adapter
Modbus Protocol Connection
| protocol | Enum | Connection mode of Modbus device. Allowed values are TCP and Serial. As of now only TCP is supported. |
| ip_address | String | Machine IP address of the Modbus connection. |
| port | Number | Port number of Modbus connection. |
Modbus Read Tag
| tag_id | String | Unique tag id defined in the context of the current thing_config. This is used further in metric_mappings or derived_tags or monitor_tag_ids to refer to this tag value. |
| tag_type | Enum | Allowed values are InputRegister, InputDiscrete, HoldingRegister and Coil. Types InputDiscrete and Coil can only hold boolean values. |
| val_type | Enum | Allowed values are boolean, short, integer, long, float, double. This indicates the type of tag value to be read from Modbus device address. In case of tag_type InputDiscrete or Coil only boolean is considered. |
| device_id | Number | Modbus device id from where data to be read. |
| ref_addr | Number | Offset address of Modbus device id. This is applicable for val_type boolean, short, integer, long, float, double. |
| read_count | Number | Optional, Default 2. Number of bytes to be read from the ref_addr. |
| endian | Boolean | Optional, Default True. This value denotes big endian byte order which is default in Modbus, False value indicate little endian byte order. Applicable in case of tag_type InputRegister or HoldingRegister. |
| bit_index | Number | Optional, Default 0. Bit index used in case of boolean values read from tag_type InputDiscrete or Coil. |
Modbus Write Tag
| tag_id | String | Unique tag id defined in the context of the current thing_config. This is used in Datonis instruction json to address this Modbus tag. |
| tag_type | Enum | Allowed values are HoldingRegister and Coil. Type Coil can only hold boolean values. |
| val_type | Enum | Allowed values are boolean, integer, long, float, double. This indicates the type of tag value to be write to Modbus device address. In case of tag_type Coil only boolean is considered. |
| device_id | Number | Modbus device id from where data to be read. |
| ref_addr | Number | Offset address of Modbus device id. This is applicable for val_type boolean, short, integer, long, float, double. |
| endian | Boolean | Optional, Default True. This value denotes big endian byte order which is default in Modbus, False value indicate little endian byte order. Applicable in case of tag_type InputRegister or HoldingRegister. |
| bit_index | Number | Optional, Default 0. Bit index used in case of boolean values read from tag_type InputDiscrete or Coil. |
Read Tags Explained
