Panasonic HL-G1 Series User Manual page 106

(3) Abnormal sequence to transmit/receive data
The following data transmitting/receiving sequence will be used if request
communication data transmitted from the external host device to the HL-G1 is
abnormal (with data range error or garbled characters).
HL-G1 External host device
R S
Request communication data (data settings, operation instruction, setting data read)
S Abnormal response communication data R
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