HT-CM400 NXP Semiconductors, HT-CM400 Datasheet - Page 56

• Manufacturer Part Number: HT-CM400
• Description: Ht Cm400; Ht Rm440 Family; Ht Rm800 Family Interface Protocol Reader - Host
• Manufacturer: NXP Semiconductors

Communication Reader-Host
3.7.40 StartFFT
This Long Range Reader command starts the FFT (Fast Fourier Transformation) of the DSP
(Digital Signal Processor) with the current BitClockDelay (BCD) value in the EEPROM of the
read/write device.
This function suppresses up to two harmonic electromagnetic disturbers in the RF Band of the
receiver (105 kHz - 145 kHz), e.g. from computers or monitors. Use this function as often as new
RF background noise arises near the Long Range antenna.
ATTENTION: As the answer to this command appears before the FFT is ready (duration of FFT
is approximately 110 ms), the host program has to wait at least 50 ms until sending the next
transponder command.
C-Function: void proloc_StartFFT (void);
Header-File: PROLIB6.H
Serial protocol:
HOST - READ/WRITE DEVICE
READ/WRITE DEVICE - HOST
Status:
Htswp.doc/HS
0x02
0x02
Status
'F'
-1 ...
-8 ...
0 ... no error
0x44
BCC
SERIAL ERROR
ACKNOWLEDGEMENT ERROR
The DSP did not send a correct acknowledge.
The error leads to a reset of the read/write device.
Page 56 (104)
Rev. 1.0
98-02-10