"""
RION NL-42 / NL-52 serial control layer.

The NL-52 has no Ethernet option (unlike the NL-43's NX-43EX LAN card); it
speaks the same ASCII command family over RS-232C or USB (virtual COM port).
This package provides a dependency-free serial client + parser so the meter
can be driven directly over USB on the bench, and later bridged onto the
network via the RX55's serial PAD mode (or a ser2net host).

Modules:
    protocol  — pure command/response parsing (no I/O, unit-testable)
    client    — termios-based serial transport + NL52Client command methods
    cli       — command-line tool for bench testing over USB
"""

from nl52.protocol import (  # noqa: F401
    DODSnapshot,
    DRDSample,
    ResultError,
    parse_dod,
    parse_drd,
    RESULT_CODES,
)