Note: 8 simultaneous connections can be used by ION, Modbus TCP, Modbus RTU over Ethernet, or DNP. Yes, it is possible to daisy chain PM8000 meters via the Ethernet port to communicate with ION Protocol, and use the RS485 serial port to act as a Modbus Gateway on the first meter, and modbus RTU for the rest of daisy chained slave devices. Modbus Gateway and Ethernet ION CommunicationsĪ third party software being used to communicate with meters with Modbus protocol, while the PM8000 meters are daisy chained via the Ethernet port to communicate with PME software with ION Protocol

By default, Modbus/TCP-capable devices ignore the unit identifier parameter.Is it possible to communicate with PM8000 meters daisy chained via the Ethernet port with ION protocol (port 7700), simultaneously with RS-485 serial port daisy chain to communicate with Modbus protocol (port 502)? In such case, the unit identifier allows reaching the slave address of the device behind the gateway. NOTE: Unit identifier is used with Modbus TCP devices which are composed of several Modbus devices, for example, on Modbus TCP to Modbus RTU gateways. For each Modbus request, you must create a channel. Repeat steps 4 to 6 to create other channels that define the Modbus communication with the device.

O Length: number of the registers to be written (depending on the function code).Ĭlick OK to validate the configuration of the channel. O Offset: starting register number to write from 0 to 65535 In the WRITE register area, you can define: O Keep Last Value (by default) holds the last valid value O Error Handling: define the fallback value in the case of a communication interruption: O Length: number of the registers to be read (depending on the function code). O Offset: starting register number to read from 0 to 65535 In the READ register area, you can define: O Write Multiple Registers (Function code 16) O Read Holding Registers (Function code 03)

O Read/Write Multiple Registers (Function code 23) (by default) O Comment: optional field to describe the channel O Repetition Rate : polling interval of the Modbus request (by default 20 ms) O Unit-ID : unit ID of the Modbus TCP slave device (by default 255).

O Name: optional string for naming the channel

Modbus poll response 255