Panasonic LP-310 Operation Manual page 179

Marking Operation and Command Transfer
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(1) When transferring command to laser marker during marking:
Only the state request command is acceptable during marking.
If a command other than the state request is transferred, the abnormal response telegram (error code
"03") is returned.
(2) When transferring command to laser marker while an alarm is occurred:
Only the state request command is acceptable while an alarm is occurred.
If a command other than the state request is transferred, the abnormal response telegram (error code
"10") is returned.
No alarm can be released by communication control. Refer to "5-1 Troubleshooting" (P.188) and "5-2
Measures for Indicated Error" (P.189) for detail of measures for alarm.
If the marking status transmission is permitted, a marking state is returned when a marking operation is finished or an
error is occurred.
Using Communication Control and I/O Connector (25-pin Connec-
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tor) Together
When the "file number change" command (FNO) is not accepted, the control using I/O connector is available.
Only the following items, "marking trigger" (MRK), "status request" (STS), "optional character string" (STR),
and "marking status transmission permission" (MST) are available for controlling through RS-232C.
In case of receiving "file number change" command (FNO):
The "file selection input (D0 to D6)" of I/O connector is ignored.
All commands can be controlled through RS-232C.
After turning OFF the power supply, the control is returned to the control from the I/O connector.
For using both communication control and I/O connector (25-pin connector), pay attention to the input timing.
In addition, as for the output signal, perform the same output using the communication control as the output
using the external control.
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