modbus.rtu_request

Build a Modbus RTU request frame and automatically append CRC16.

Parameters	Type	Required	Default value	Description
config	Object	Yes	None	Requests a configuration object.

Field	Type	Required	Default value	Description
unit_id	Int	No	`1`	Slave address, 0 to 255.
function_code	Int	No	None	Modbus function code. The `function` string can also be used.
function	String	No	None	Function name, for example `read_holding_registers`.
address	Int	Use when reading and writing registers/coils	`0`	Starting address.
quantity	Int	When reading, use	`1`	to read the quantity.
value	Int/Bool	When writing a single register/coil use	`0`	to write a value.
values	Array	Use when writing multiple registers/coils	None	Multi-value writing data.
pdu	Bytes/Array	No	None	Original PDU; it will no longer be constructed based on the function code after being passed in.
data	Bytes/Array/String	No	None	Unsupported custom function code additional data.

Type	Description
Bytes	RTU ADU complete request frame.