Omron V780 Series User Manual page 242

7 Modbus/TCP Communications
GET ACCESS PASSWORD
 Function
This command reads the access password that is set for RF Tag communications in the
Reader/Writer.
 Command Format
Byte-0 Byte-1
Transaction identi-
fier
X X
Parameter
Register address
Word count
 Response Formats
• Normal Response
Byte-0 Byte-1
Transaction identi-
fier
X X
Parameter
Byte count
Access password
• Error Response
Byte-0 Byte-1
Transaction identifier
X X
Parameter
Exception code
 Execution Examples
Execution When the Reader/Writer Access Password Is Set to "12345678 hex"
TX: 000000000006FF03C4000002
RX: 000000000007FF030412345678
7 - 90
Byte-2 Byte-3 Byte-4
Protocol identifier Field length
0000 hex 0006 hex
The register address (C400 hex) that specifies reading the access
password
The number of words in the access password to read (0002 hex)
Byte-2 Byte-3 Byte-4 Byte-5
Protocol identifier Field length
0000 hex 0007 hex
The number of bytes in the access password (04 hex)
Gives the access password to use for RF Tag communications in
8-digit hexadecimal.
The specified access password is stored in EEPROM memory in
the Reader/Writer.
If the access password in the RF Tag is not all zeros, the access
password that is stored in EEPROM memory must be used to exe-
cute LOCK, ID WRITE, DATA READ, or DATA WRITE commands.
Byte-2 Byte-3 Byte-4
Protocol identifier Field length
0000 hex 0003 hex
For details, refer to Exception Code on page 7-7 under 7-2-3 Response Format for
Error Completion on page 7-7.
Byte-5 Byte-6 Byte-7
Unit Function
identifier code
FF hex 03 hex
Description
Byte-6 Byte-7
Unit Function
identifier code
FF hex 03 hex
Description
Byte-5 Byte-6 Byte-7
Unit iden- Function
tifier code
FF hex 83 hex
Description
UHF RFID System V780-series Reader/Writer User's Manual (Z389)
Byte-8 Byte-9 Byte-10 Byte-11
Register address Word count
C400 hex 0002 hex
Byte-8 Byte-9 ... Byte-12
Byte Access password
count
04 hex 4 bytes
Default setting
00000000 hex
Byte-8
Excep-
tion code
1 byte