User's Manual

7 - 123
7 Modbus/TCP Communications
UHF RFID System V780-series Reader/Writer User’s Manual (Z389)
7-6 V780 Command Details
7
7-6-10 Maintenance Commands: RF Communications Information
 Function
This command measures the ambient noise level around the Reader/Writer.
 Command Format
 Response Formats
• Normal Response
• Error Response
GET NOISE LEVEL
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 DB00 hex 000F hex
Parameter Description
Register address The register address (DB00 hex) for getting the noise level
Word count Always 000F hex.
The noise information for channels 1 to 15 is read at the same time.
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
Byte
count
X X 0000 hex 0021 hex FF hex 03 hex 1E hex
Byte-9 Byte-10 ... Byte-37 Byte-38
Channel 1 noise
level
... Channel 15 noise
level
2 bytes ... 2 bytes
Parameter Description
Channel 1 noise level Gives the noise level for channel 1 in signed 2-digit hexadecimal.
FFFF to FF9D hex (-1 to -99) [dBm]
... ...
Channel 15 noise level Gives the noise level for channel 15in signed 2-digit hexadecimal.
FFFF to FF9D hex (-1 to -99) [dBm]
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 7-2-3 Response Format for
Error Completion on page 7-7.