Appraisal Commands - Omron V670-CF01 User Manual

SECTION 4
Commands

Appraisal Commands

If errors are frequent during communications with Tags, one of the causes may be ambient noise. The
appraisal commands are used to investigate whether or not noise is the cause of errors. It can also be used to
check noise generation at installation sites before installing V670-series Tags or Antennas and Controllers.
Even if read results are normal, reception waveforms may exhibit interference. These commands can be used
to check for noise at the waveform level to provide more detailed information on the actual status of the
waveforms.
Noise Measurement Command (NS)
Investigates the noise level when commands are received.
Command
Command
code "NS"
2
Response
Command
code "NS"
2
Noise evaluation result
Example: Investigating Ambient Noise Level
Send data:
Receive data: NS00000A*[CR]
Electromagnetic Inductive RFID System
56
User's Manual
CR
2
End code Retry Status Result of
flag flag
noise level
measure-
ment
2 1 1 1
The noise level is evaluated as the maximum absolute value in the measured data.
"A": Low noise level (0.0 V to 2.0 V); indicator will light green.
"B": High noise level (2.0 V to 3.3 V); indicator will flash red.
NS*[CR]
CR
2