Omron V780 Series, User Manual

Page: 175 / 398

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7 Modbus/TCP Communications
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-
6 V780 Co
mm
and
Detail
s
7
7-6
-1 Single
-access Communicat
ions Comman
ds
• Error Response
 Execution Examples
Reading the ID Data from the RF Tag
Example 1: Execution When an RF Tag Is in the Communications Range (StoredPC: 3000 hex, UII
(EPC code): 111122223333444455556666 hex)
TX: 000000000006FF0340000020
RX: 000000000043FF0340300011112222333344445555666600…00
* Words 7 through 31 of the UII (EPC code) section (i.e., the words past the EPC length of 6 words)
are filled with zeros.
Example 2: Execution When an RF Tag Is Not in the Communications Range (Exception Code: 04
Hex (Failure in Device))
TX: 000000000006FF0340000020
RX: 000000000003FF8304
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8
Transaction identi-
fier
Protocol identifier Field length Unit
identifier
Function
code
Excep-
tion
code
X X 0000 hex 0003 hex FF hex 83 hex 1 byte
Parameter Description
Exception code For details, refer to Exception Code on page 7-7 under Response Format for Error
Completion on page 7-7.