8.25. serial_communication_hub

This interface provides multiplexed access to one serial port (e.g. RS485) for multiple clients.

8.25.1. Commands

modbus_read_holding_registers:object

Send a Modbus RTU ‘read holding registers’ command via serial interface to the target hardware. (return value: response)

target_device_id:integer

ID (1 byte) of the device to send the commands to

first_register_address:integer

Start address for read operation (16 bit address)

num_registers_to_read:integer

Number of registers to read (16 bit each)

Result:object (serial_comm_hub_requests-Result)

Result of the transfer

There is an extended definition for this object here.

modbus_read_input_registers:object

Send a Modbus RTU ‘read input registers’ command via serial interface to the target hardware. (return value: response)

target_device_id:integer

ID (1 byte) of the device to send the commands to

first_register_address:integer

Start address for read operation (16 bit address)

num_registers_to_read:integer

Number of registers to read (16 bit each)

Result:object (serial_comm_hub_requests-Result)

Result of the transfer

There is an extended definition for this object here.

modbus_write_multiple_registers:string

Send a Modbus RTU ‘write multiple registers’ command via serial interface to the target hardware. (return value: response)

target_device_id:integer

ID (1 byte) of the device to send the commands to

first_register_address:integer

Start address for write operation (16 bit address)

data_raw:object (serial_comm_hub_requests-VectorUint16)

Data content to be written to the above selected registers (in 16 bit words)

There is an extended definition for this object here.

Result:string (serial_comm_hub_requests-StatusCodeEnum)

Status code of the transfer

There is an extended definition for this object here.

nonstd_write:void

Non standard mode to write registers in read discrete input mode without waiting for reply. Used e.g. by GYDCG-UBC1 isolation monitor.

target_device_id:integer

ID (1 byte) of the device to send the commands to

first_register_address:integer

Start address for read operation (16 bit address)

num_registers_to_read:integer

Number of registers to read (16 bit each)

nonstd_read:object

Non standard mode to read registers in read coils mode, but getting a malformed reply. Used e.g. by GYDCG-UBC1 isolation monitor.

target_device_id:integer

ID (1 byte) of the device to send the commands to

first_register_address:integer

Start address for write operation (16 bit address)

num_registers_to_read:integer

Number of registers to read (16 bit each)

Result:object (serial_comm_hub_requests-Result)

Result of the transfer

There is an extended definition for this object here.