# scenario: DCU query on MASS_FLOW (stat 5) on an MC-500SCCM-D
# Captured 2026-04-17 from /dev/ttyUSB0 (Prolific PL2303, 19200 baud,
# unit_id=A, firmware 10v20.0-R24).
#
# Real shape: `<uid> <unit_code> <unit_label>` — 3 fields, no statistic echo.
# Synthetic prior fixture's 4-field shape was wrong. See design §16.6.

# Query.
> ADCU 5
< A 12 SCCM

# Set form (set+verify echoes the same 3-field reply with the new unit).
> ADCU 5 7
< A 7 SLPM
