Panasonic LP-M Series Maintenance Manual page 157

„ External control
Troubles
Communication with the
external device cannot
start.
Serial communication
control fails
Causes
Laser marker is not in remote mode.
The wiring between the laser marker
and the external control devices is
incorrect.
There are noises coming from
surrounding equipment.
Selected communication port is
inappropriate.
The RS-232C cable is connected to the
wrong connector (RETURN OUT).
The connection of the communication
cable is incorrect.
Communication parameter settings are
incorrect.
ME-LPM-SSM-10
Measures
Press Remote switch on front of controller or enter
remote mode in a manner described in "Safety /
Setup / Maintenance Guide".
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 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.
For communication with external devices, select
either RS-232C or Ethernet port.
(They cannot be used at the same time, or
switched.)
The port selected in the environment setting
screen indicates the valid communication port.
RS-232C is selected at factory shipment.
Connect the RS-232C cable to "RS-232C"
connector on the rear of the controller.
• For RS-232C, use a commercially available
cross cable. (A straight cable cannot be used.)
Laser marker has three-wire connection. (Only
pins Nos. 2, 3 and 5 of RS-232C connector are
used.)
• For RS-232C connection, confirm the wiring
of the external device including the loop back
connection.
For Ethernet, check the followings:
• To use an external device and the laser marker
one to one, connect them with a commercially
available cross cable (STP cross cable of the
Category 5e or higher is recommended).
• To use an external device and the laser
markers one to many, prepare a hub or
router compliant to 1000BASE-T, 100BASE-
TX, or 10BASE-T and connect them with a
commercially available straight cable (STP
straight cable of the Category 5e or higher is
recommended).
• Match communication parameter settings to
external equipment. Communication parameter
settings of laser marker can be checked in the
environment setting screen.
• When using RS-232C, specify the "Flow
control" to "None" at the communication port
settings of the external control device.
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