USER MANUAL PREVIEW
PTM 535BZ
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BLUETOOTH AND ZIGBEE GREEN POWER PUSHBUTTON TRANSMITTER
© 2021 EnOcean | www.enocean.com
F-710-017, V1.0
PTM 535BZ User Manual | v1.0 | May 2021 | Page 101/112
B.1.1
Advertising interval
PTM 535BZ transmits advertising events with an advertising interval of either 20 ms (default
setting) or 10 ms (NFC configurable setting).
The time required to transmit each advertising telegram within the advertising event is ap-
proximately 0.5 ms and the time required to transmit the entire advertising event (transmis-
sion of three advertising telegrams on three different radio channels including radio channel
change) is approximately 2.5 ms.
B.1.2
Scan window
The scan window has to be selected such that the receiver will under all conditions receive
at least one full advertising telegram.
To ensure this requirement, we consider the worst-case condition where the receiver starts
scanning directly after the start of one transmission and therefore misses a part of it. Under
these conditions, it is necessary that the receiver remains active until the next advertising
telegram has been fully transmitted. This is illustrated in
Advertising Interval
Scan Window
Adv
er
ti
si
ng
Adv
er
ti
si
ng
Figure 57
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Scan window setting
above shows that the minimum duration of the scan window is dependent on the
advertising interval:
◼
If PTM 535BZ uses 20 ms advertising intervals, then the scan window has to be at
least 20 ms (advertising interval) plus 0.5 ms (telegram duration) plus a timing
margin to account for the random time offset at the transmitter.
Using a scan window of at least 23 ms is recommended for this case.
◼
If PTM 535BZ uses 10 ms advertising intervals, then the scan window has to be at
least 10 ms (advertising interval) plus 0.5 ms (telegram duration) plus a timing
margin to account for the random time offset at the transmitter.
Using a scan window of at least 13 ms is recommended for this case.