User Manual

IUH-F192-V1-*
Operation
2022-11
51
Retrieve Additional Information MD
This parameter allows you to retrieve information about the last successful tag access. This
returns the RSSI value with a length of 1 byte, the transmission channel used with a length of 1
byte, and the transmitting power with a length of 2 bytes. The RSSI value may be between 0 (=
low) and 100 (= high).
Parameter MD allows the same data to be accessed in the single-frame protocol as is available
in the multiframe protocol with parameter IF. See "Protocol Mode QV" on page 53 and see
"Output Additional Information, "Information" IF" on page 50.
Example:
RP1UMD.00.01.01 returns the response .30.01.13.04.00.32
Explanation of the response:
<Status> = 0
<ChanNo> = 1
<RSSI> =. 13 = 19
dec
<TXChannel> =. 04
<TXPower> = .00.32 = 50
dec
mW
Measurement of Reflected Transmitting Power "Measure Reflection" MF
This parameter measures the reflected transmitting power of the antenna and the environment.
The results are output as one byte per transmission channel. The transmission channels are
dependent on the country-specific settings, .
The parameter is not output for the "combined" antenna polarization.
To obtain the reflected power in dBm, subtract the value 100 from the return value in decimal
notation.
Example:
If the country identifier RC = 01 (= 4 channels), RP1UMF.00.00 returns the response
01.63.64.67.65
Explanation of the response:
<Status> = 0
<ChanNo> = 1
<PCh04> = .63 = 99
dec
results in 99 - 100 = -1 dBm
<PCh07> = .64 = 100
dec
results in 100 - 100 = 0 dBm
<PCh10> = .67 = 103
dec
results in 103 - 100 = +3 dBm
<PCh13> = .65 = 101
dec
results in 101 - 100 = +1 dBm
Number of Channels NC
Frequency Access Method Frequency hopping spread spectrum:
Parameter NC indicates the number of channels on which a write or read attempt is performed.
If the value 4 is set, the read/write head attempts to read the tag on 4 different frequencies
when a read command is given. The parameter can be read and written.
ParamTyp: MD
ParamTyp: MF
Value range:
-18 .. +21 dBm
1
1. 0 or 255 is returned for values outside the value range