Panasonic LP-400 Series, External Control Manual

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3-5-3 Communication sequence
This chapter explains the communication (transmitting/receiving) sequence of command or response data between external
device and laser marker.
The communication sequence differs when the marking status is set to “transmission prohibited” from “transmission
permitted”.
⿎
Communication sequence at normal data setting/operation instruction
The communication sequence where normal command/setting is transmitted from external device to laser marker is shown
below.
Laser marker
Normal receiving response (ACK)
Transmission Reception
Reception Transmission
Command (Setting data)
External device
⿎ Communication sequence at normal readout of setting data
The communication sequence where normal readout of setting (sub command “R”) is transmitted from external device to
laser marker is shown below.
Laser marker
Readout response
Transmission Reception
Reception Transmission
Command (Readout of setting data)
External device
⿎
Communication sequence at abnormal data setting/operation instruction
The communication sequence where abnormal command/setting is transmitted from external device to laser marker is
shown below.
Laser marker
Abnormal receiving response (NAK)
Transmission Reception
Reception Transmission
Command (Setting data)
External device
⿎ Reception time-out
The laser marker has “reception time-out check” function, which monitors the lapsed time of receiving the command from
the head till the end when it receives the command from external device. The period for reception time-out is 10 seconds. If
the telegraphic message reception has not been fully completed within the specified period, the laser marker considers that
any trouble may occur in external device or in the communication line and stops all communication process.
The data under being received are broken.
ME-LP400V-EX-6