164
Se
ct
io
n 7
Mo
dbus
Commun
ic
a
tion
s
Prot
ocol
RFID System
User's Manual
(Modbus TCP)
Section 7
Host Communications Specifications
Error Handling
If an error occurs, you can check the error logs in the Reader/Writer to get details on the nature of the
error. An error has occurred if the function code in the response that was returned from the Reader/
Writer is 80 hex higher than the function code in the query. You can read the error logs by sending a
query to get the error log information from the host device or you can read the error logs from a Web
browser using the Web server.
Refer to
for information on the error logs
Client
(host de
v
ice)
Ser
v
er
(Reader/
W
riter)
Q
u
ery sent.
Response sent.
Q
u
ery to read error log sent.
Error log information ret
u
rned.
F
u
nction code +
8
0 hex
(Or error log checked from a
b
ro
w
ser)
Error detected.
Error detected.
