User's Manual

7 Modbus/TCP Communications
7 - 46
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
• Error Response: Command Error
 Execution Examples
Execution for Reading ID Data from Multiple RF Tags with no Option Specification
Example 1: Execution When Four RF Tags Are in the Communications Field
TX: 000000000006FF6400030000
RX: 000000000116FF6400030004
00003000AAAA…AAAA0000…0000: RF Tag A error code + StoredPC + EPC code (The six
words of the EPC length are all AAAA hex.)
00003000BBBB…BBBB0000…0000: RF Tag B error code + StoredPC + EPC code (The six
words of the EPC length are all BBBB hex.)
00003000CCCC…CCCC0000…0000: RF Tag C error code + StoredPC + EPC code (The six
words of the EPC length are all CCCC hex.)
2002000000000000000000…0000:
RF Tag D error code (2002 hex (communications error))
Example 2: Execution When an RF Tag Is Not in the Communications Field (Exception Code: 04
Hex (Failure in Device))
TX: 000000000006FF6400030000
RX: 000000000003FFE404
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 E4 hex 1 byte
Parameter Description
Exception code For details, refer to Exception Code on page 7-7 under 7-2-3 Response Format for
Error Completion on page 7-7.