Panasonic LP-GS Series Serial Communication Command Manual page 146

⿎ External control
Troubles
Communication with
the external device
cannot start.
Control by serial
communication fails
146
Causes
Laser marker is not in remote
mode.
The connection with external
devices is inadequate.
There are noises coming
from surrounding equipment.
The connection of the
communication cable is
incorrect.
Communication parameter
settings are incorrect.
The communication setting
was changed at the time of
backup file restoration.
Command data is not
received from external
equipment.
Communication data format
(start code) is inadequate.
Communication data format
(end code) is inadequate.
• Select the remote mode by following the procedure indicated
in Setup/Maintenance Guide.
• Check if the entering method of the remote mode set in the
system settings screen (I/O or PC software) and the actual
control method are consistent.
• If the entering method of the remote mode is changed in the
system settings screen, restart the laser marker.
• Check connections with external equipment for mis-
connection, disconnection or contact failure due to any loose
connector.
• Check for continuity using tester or the like.
Protect laser marker against noises as follows:
• Securely ground the frame ground terminal of laser marker or
surrounding equipment.
• Isolate power and signal lines from each other if they have
been routed in parallel.
• Shield signal line.
• Isolate power supply for laser marker from other equipment.
• Use noise cut transformer to absorb noises from power
supply.
• Check the applicable cable type and connecting conditions
described in Setup/Maintenance Guide for proper wiring.
• For RS-232C connection, confirm the wiring of the external
device including the loop back connection.
• Match communication parameter settings to external
equipment.
• If the Ethernet communication settings or RS-232C usage are
changed, restart the laser marker.
• When using RS-232C, specify the "Flow control" to "None"
at the communication port settings of the external control
device.
Check the communication setting. If Ethernet is used, check
the IP address, etc. When the backup file is restored, the
communication setting is overwritten by the backup data.
Using commercially available line monitor or protocol analyzer,
check if the external equipment transmits data.
Check if the start code specified in laser marker system settings
screen and start code of the transmitted data are consistent.
• Check if an end code is placed at the end of the transmitted
data.
• For RS-232C, check if the end code is the value specified in
the laser marker system settings screen.
ME-LP-GS-SR-COMP-3
Measures