Panasonic HL-G1 Series - Page 134

Type
Problem Cause Corrective action
Ref.
pa
g
e
㻌㻌 㻌
COM
RS-485
communication
control cannot be
done.
Normal
communication
over RS-422/485
is impossible.
The wiring is incorrect.
RS-422 and RS-485 are different in
wiring. Connect the wires correctly.
Use a twisted-pair cable to ensure
stable communication.
4-2
4-3
4-4
The RS-422/485 connecting
cable is disconnected.
Check the
connection
between
RS-422/485 cable and connector.
4-2
The wrong connection mode
and baud rate are selected.
Connect the connection mode
and baud rate correctly.
3-36
The communications
settings for the external
equipment are wrong.
Check the settings for the external
equipment (e.g., the
communications board) and be
sure to set the correct
RS-422/485
communications specifications
.
4-2

The sensor number
settings are wrong.
If a number of sensors are connected
over RS-485, be sure to set a unique
sensor number for each sensor.
3-35
4-4
The selection of the
terminating sensor is
wrong.
Select the terminating resistor
(R3) only for the terminating
sensor head only. Be sure to turn
OFF the terminating resistor of
the rest of the sensor heads.
3-34
COM
RS-485
communication
control cannot be
done.
Normal
communication
over RS-422/485
is impossible
The communication quality
is degraded as a result of the
wiring condition.
The communication condition may be
improved by lowering the baud rate.
The communication condition may be
improved by selecting the R1 or R2
terminating resistor.
3-34
3-36
Check that the correct
Sending delay time is set.
In the case of connecting a number of
units over RS-485, reception errors in
the host device can be avoided by
delaying the sensor's response time.
3-38
An incorrect data format
or command is
transmitted.
Refer to the
error codes
and
send the data with the correct
format and command.
4-8
4-16
Several commands are sent
continuously without
waiting receiving responses
from the controller.
Send the next command after the
controller transmits the response
to the previous command.
4-6
SET
The settings are
wrong.
㻌
The settings were not
saved while RS-422/485
communication was
used.
The execution of the
Save
command
is required after making
setting changes with the
communications command (by using
the Setting and Monitoring Software
HL-G1SMI or the dedicated console.
The set value will be discarded with
the power turned OFF if the set value
is not saved.
㻌
3-43
Ramco Innovations
(
800
)
280-6933 www.panasonicsensors.com nsales
@
ramcoi.com