User's Manual
Table Of Contents
- Modbus/TCP Communications
- 7-1 Outline
- 7-2 Message Formats
- 7-3 RF Communications Command Options
- 7-4 Communications Procedure
- 7-5 Commands
- 7-6 V780 Command Details
- 7-6-1 Single-access Communications Commands
- 7-6-2 Multiaccess Communications Commands
- 7-6-3 Modbus Expansion Communications Commands
- 7-6-4 Reader/Writer Control Commands
- 7-6-5 Reader/Writer Setting Commands: Network Settings
- 7-6-6 Reader/Writer Setting Commands: Communications Settings
- 7-6-7 Reader/Writer Setting Commands: Device Settings
- 7-6-8 Maintenance Commands: Device Information
- 7-6-9 Maintenance Commands: Log Information
- 7-6-10 Maintenance Commands: RF Communications Information
7 - 85
7 Modbus/TCP Communications
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-6 V780 Command Details
7
7-6-6 Reader/Writer Setting Commands: Communications Settings
Function
This command reads the access password that is set for RF Tag communications in the
Reader/Writer.
Command Format
Response Formats
• Normal Response
• Error Response
Execution Examples
Execution When the Reader/Writer Access Password Is Set to “12345678 hex”
TX: 000000000006FF03C4000002
RX: 000000000007FF030412345678
GET ACCESS PASSWORD
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8 Byte-9 Byte-10 Byte-11
Transaction identi-
fier
Protocol identifier Field length Unit
identifier
Function
code
Register address Word count
X X 0000 hex 0006 hex FF hex 03 hex C400 hex 0002 hex
Parameter Description
Register address The register address (C400 hex) that specifies reading the access
password
Word count The number of words in the access password to read (0002 hex)
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8 Byte-9 ... Byte-12
Transaction identi-
fier
Protocol identifier Field length Unit
identifier
Function
code
Byte
count
Access password
X X 0000 hex 0007 hex FF hex 03 hex 04 hex 4 bytes
Parameter Description Default setting
Byte count The number of bytes in the access password (04 hex)
Access password 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, WRITE ID, READ DATA, or WRITE DATA commands.
00000000 hex
Byte-0 Byte-1 Byte-2 Byte-3 Byte-4 Byte-5 Byte-6 Byte-7 Byte-8
Transaction identifier Protocol identifier Field length Unit iden-
tifier
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 7-2-3 Response Format for
Error Completion on page 7-7.