Per 协议简述(3): Byte33 is now control instruction (0=IDLE, 1=scan, 2=treat), Byte34 is XOR checksum. Backward compat with 33-byte read-back preserved. All command sites updated with correct control: - auto-scan: control=0x01 (scan mode) - treatment-setup: control=0x02 (treat mode) - stopTreatment: control=0x00 (IDLE)