USER MANUAL
STM 550B / EMSIB - EASYFIT MULTISENSOR FOR IOT APPLICATIONS (2.4 GHZ BLE)
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F-710-017, V1.0
STM 550B / EMSIB User Manual | v1.3 | June 2020 | Page 34 / 115
5.3.1
User-defined radio transmission sequences
STM 550B supports the following user-defined radio transmission sequences:
◼
Three-channel sequence
This sequence is similar to the default Advertising Event with the difference that the
user can select the radio channels to be used. The three-channel sequence is de-
scribed in chapter 5.3.2 below.
◼
Two-channel sequence
In this sequence the radio telegram is transmitted using six transmissions on two
radio channels. It is described in chapter 5.3.3 below.
◼
One-channel sequence
In this sequence the radio telegram is transmitted using nine transmissions on one
radio channel. It is described in chapter 5.3.4 below.
5.3.2
Three-channel sequence
The three-channel radio transmission sequence is similar to the default transmission se-
quence with the difference that the radio channels (BLE Channel 37, 38 and 39 in the default
transmission sequence) can be selected using the registers
CH_REG1
,
CH_REG2
and
CH_REG3
as
described in chapter 9.5.5.
In this mode, the telegram will be transmitted on the radio channel selected by
CH_REG1
first,
immediately followed by a transmission on the radio channel selected by
CH_REG2
and a
transmission on the radio channel selected by
CH_REG3
.
The telegram will be transmitted using this sequence three times in total as shown in Figure
18 below.
This transmission uses a default
INTERVAL
setting of 20 ms; an alternative setting of 10 ms
can be configured via NFC as described in chapter 9.5.8.
CH_REG1
CH_REG2
CH_REG3
INTERVAL
(20 ms or 10 ms)
CH_REG1
CH_REG2
CH_REG3
INTERVAL
(20 ms or 10 ms)
CH_REG1
CH_REG2
CH_REG3
Figure 18
–
Three channel radio transmission sequence