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4-2-9
Communication Sequence
This section describes sequence of the transmission and reception for either command or response data
between the external device and laser marker
Note that the sequence of the transmission and reception is activated differently for interruption prohibited state
and interruption allowed state.
Normal Transmission/Reception Sequence for Data Setting andOperation Direction
■
The following figure shows the sequence when the command and setting transmitted from the external device
to the laser marker is correct.
External Device
Send
Receive
Normal Sequnece of Setting Data Readout
■
The following figure shows the sequence when the readout of the setting data (subcommand: 'R') transmitted
from the external device to the laser marker is correct.
External Device
Send
Receive
•
In case of sending command from the external device continuously, be sure to check the
reception of the response from the laser marker, and send the command.
CHECK
Transmission/Reception Sequence for Abnormal Command
■
The following figure shows the sequence when the command sent to laser marker from the external device is
abnormal.
External Device
Send
Receive
Reception Timeout
■
The laser marker performs the reception timeout check (monitoring the time for completely receiving data
ranging from the top to the bottom of the command while a command is received) when receiving the com-
mand sent from the external device.
The time of the reception timeout is 10 seconds. If the command is not received completely from the top to the
bottom of the data within this time, it is judged that some trouble has occurred either on the external device or
on the transmission route, and all transmission/reception processing is stopped completely.
When the reception timeout occurs, the data being received is discarded.
Command (Command/Setting Data)
Normal Reception Response
Command (Readout Setting Data)
Readout Response
Command (Data Setting, Operation Indication,
Setting Data Readout, etc.)
Abnormal Reception Response
Laser Marker
Receive
Send
Laser Marker
Receive
Send
Laser Marker
Receive
Send
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Troubleshooting
