Brooks Automation
56 278580 Revision A
7 Operation LF80C ZeniD RFID Reader
7.2 Operation of the ASC-I1 Protocol Product Manual
I - Set tuning of the
RF module
Depending on the surroundings of the antenna it might be necessary to
tune the RF module to get the optimal reading/writing range for this special
installation environment. The RF module has 6 capacitors C
0
- C
5
which can
be switched ON or OFF.
Each capacitor can be addressed by one bit. This bit is used to activate (1)
or disable (2) a capacitor.
The tuning can be set manually (not recommended) or automatic tuning
can be performed (recommended).
0 - OFF
1 - ON
Bit 2
0
corresponds to capacitor C
0
.
Parameter structure from C
0
to C
5
:
For the calibration of the antenna exclusively the automatic calibration
(calibration value 0x04) should be used as in this case the antenna sends
and receives optimally, that means with maximal range.
For special cases (for example reading and writing range shall be reduced)
it can be necessary that the efficiency of the antenna has to be reduced by
connecting or disconnecting single capacitors. But this should be carried out
only by qualified staff.
If no reasonable calibration was found, the error "5 - Invalid" is sent instead
of the confirmation, and all capacitors are switched ON.
Host → Reader
CMD Reader ID Tuning
I 1 byte 2 bytes
Reader → Host
CMD Reader ID
i1 byte
Hex. value Bin. value Meaning
00 0000 0000 no capacitor is set
3F 0011 1111 all 6 capacitors are set
40 0100 0000 starts the automatic tuning
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