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 61/86
9.2.3
Scan interval
The scan interval has to be selected such that the receiver will not be inactive so long that
it misses all three advertising events.
The longest period for which the receiver can be inactive is given by the time between the
end of the first advertising events (assuming that the receiver exactly misses the last bit of
it) and the beginning of the third advertising event (so that this will certainly be received).
Figure 42 illustrates this.
Scan Interval
Ad
ve
rt
is
in
g
Ad
ve
rt
is
in
g
Ad
ve
rt
is
in
g
Figure 42 – Scan interval setting
From Figure 42 above it can be seen that the maximum duration of the scan interval is de-
pendent on the advertising interval:
If PTM 216B uses 20 ms advertising intervals, then the scan interval has to be less
than the time between the end of the first advertising event and the begin of the
third advertising event (2 * 20 ms = 40 ms) minus 0.5 ms (telegram duration) mi-
nus a timing margin to account for the random time offset at the transmitter.
Using a scan interval of no more than 37 ms is recommended for this case.
If PTM 216B uses 10 ms advertising intervals, then the scan interval has to be less
than the time between the end of the first advertising event and the begin of the
third advertising event (2 * 10 ms = 20 ms) minus 0.5 ms (telegram duration) mi-
nus a timing margin to account for the random time offset at the transmitter.
Using a scan interval of no more than 17 ms is recommended for this case.
9.2.4
Summary
Table 9 below summarizes the recommended receiver scan settings.
PTM 216B
Advertising Interval
Receiver Scan Window
(Minimum)
Receiver Scan Interval
(Maximum)
10 ms
23 ms
37 ms
20 ms
13 ms
17 ms
Table 9 – Recommended receiver scan settings
