labelwriter / core/src / STATUS_REQUEST
Variable: STATUS_REQUEST
constSTATUS_REQUEST:Uint8Array
ESC A — Request Print Engine Status. Two-byte form on the 450 family (1B 41); three-byte form on the 550 family with a lock parameter (1B 41 <lock>). Use buildStatusRequest(device) to pick the right shape.
Constant kept for back-compat — it's the 450 form, which is also what the 550 firmware accepts as a no-lock heartbeat (the lock byte defaults to 0).