254
T
rou
blesho
o
ting F
lowchar
ts
Sect
ion 9
RFID System
User's Manual
(Modbus TCP)
Section 9
Troubleshooting
Host Device Communications Check Flowchart
START
Is there a response?
N
o
Yes
Exception
code = 01 hex?
Is the connector
w
iring OK?
Yes
Are the net
w
ork
settings OK?
Correct the connector
w
iring.
Correct the settings.
Yes
Is the
qu
ery
frame correct?
Send the correct frame.
N
o
Yes
Is the data specified
in the
qu
ery correct?
Send the correct data.
N
o
Yes
Is the Reader/
W
riter
bu
sy?
Send the
qu
ery
w
hen
the Reader/
W
riter can
perform processing.
Is the host de
v
ice
operating normally?
Replace the Reader/
W
riter.
Correct the host de
v
ice
program or replace the
host de
v
ice.
OK
N
o
Yes
N
o
N
o
N
o
N
o
Yes
Yes
Yes
Yes
N
o
N
o
Exception
code = 02 or 03 hex?
Exception
code = 06 hex?
