USER MANUAL
PTM 216B – BLUETOOTH
®
PUSHBUTTON TRANSMITTER MODULE
© 2022 EnOcean | www.enocean.com
F-710-017, V1.0
PTM 216B User Manual | v1.0 | February 2022 | Page 60/86
9.2.1
Advertising interval
PTM 216B 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 (trans-
mission of three advertising telegrams on three different radio channels including radio
channel change) is approximately 2.5 ms.
9.2.2
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 Figure 41 below.
Advertising Interval
Scan Window
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Figure 41 – Scan window setting
From Figure 41 above it can be seen that the minimum duration of the scan window is de-
pendent on the advertising interval:
If PTM 216B 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 216B 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.