ModbusTransport

class ModbusTransport

Bases: TransportBase, ABC

Abstract Modbus line: owns the session, locking, and every wire op, addressed per call via unit_id. Annotate against it; construct a concrete subclass.

Initialize holder tracking, the lock, and the (not yet connected) client slot.

Attributes

is_open

Whether the client has been opened and not closed.

Methods

check_unit_id	Validate unit_id against this physical layer's range (0 to _max_unit_id) and return it.
close	Close and teardown; with a holder, remove it and tear down only when the last owner leaves.
lock	Return the reentrant resource lock for atomic multi-step sequences; the holder may write/query/read inside it.
open	Open the connection (idempotent); with a holder, admit it and return True only for the first owner.
read_coils	Read coils by address (FC01).
read_discrete_inputs	Read discrete inputs by address (FC02).
read_holding_registers	Read holding registers by address (FC03).
read_input_registers	Read input registers by address (FC04).
read_typed	Read address as data_type, dispatching by register_type and decoding across registers.
write_coil	Write a single coil by address (FC05).
write_coils	Write multiple coils by address (FC15).
write_holding_register	Write a single holding register by address (FC06).
write_holding_registers	Write multiple holding registers by address (FC16).
write_typed	Encode value as data_type and write it to address, dispatching by register_type.