USER MANUAL
STM 550 / EMSI
–
ENOCEAN MULTISENSOR FOR IOT APPLICATIONS
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 56/97
9.5.9
SIGNAL
STM 550 supports reporting its energy status, the current energy delivery of the harvester
and the backup battery status via SIGNAL telegrams as described in chapter 5.2.7.
The type and the transmission rate of SIGNAL telegrams is controlled by the SIGNAL regis-
ter shown in Figure 36 below.
SIGNAL (Default: 0x31)
Bit 7 Bit 6 Bit 5 Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TRANSMISSION RATE
RFU
BACKUP
BATTERY
ENERGY
DELIVERY
ENERGY
STATUS
Figure 36
–
SIGNAL register
STM 550 supports the following SIGNAL types:
◼
ENERGY STATUS (MID 0x06)
◼
ENERGY DELIVERY (MID 0x0D)
◼
BACKUP BATTERY STATUS (MID 0x10)
Transmission of these supported SIGNAL types can be enabled by setting the associated
configuration bit in the SIGNAL register to 0b1 and disabled by setting the associated con-
figuration bit to 0b0.
By default, the reporting of the energy status (MID 0x06) is enabled while the reporting of
energy delivery (MID 0x0D) and backup battery status (MID 0x10) is disabled.
STM 550 allows additionally to configure at what rate each enabled SIGNAL telegram will be
sent using the TRANSMISSION RATE bit field as shown in Table 15 below. If more than one
SIGNAL telegram is enabled, then this rate will apply to all enabled telegrams. The SIGNAL
telegrams will be transmitted at different times (i.e. not all at the same time one after an-
other) in that case.
TRANSMISSION RATE
Transmission rate for SIGNAL telegrams
0b0000
One SIGNAL telegram every 8 data telegrams
0b0001
One SIGNAL telegram every 16 data telegrams
0b0010
One SIGNAL telegram every 24 data telegrams
0b0011 (Default)
One SIGNAL telegram every 32 data telegrams
…
0b1111
One SIGNAL telegram every 128 data telegrams
Table 15
–
TRANSMISSION RATE bit field encoding