Downlink Messages - Multitech REVEAL User Manual

SENSOR-SPECIFIC MESSAGES
Payload Type
0x0
0x1
0x2
0x3
In the condensed FFT message, bytes 1-8 contain four 16-bit values. For example, if the sensor is reporting a peak
energy value of 300 in frequency band 5 of channel 1, the payload definition byte would be 0x31 and bytes 3-4
would be 0x012C (300 decimal).

Downlink Messages

The downlink message (web application to sensor) specific to the vibration sensors are defined in this section. The
common downlink messages are not included in this section (see common messages document).
The low-frequency and high-frequency sensors are divided into two downlink messages, as some products may
contain one or the other, or both.
The table below describes the configuration used for each channel.
Byte
0
1
2
3
4
5
6
The configuration defined above is the same for each channel. Using ID 0x1C configures Channel 1, ID of 0x1D
configures Channel 2, ID 0x1E configures Channel 3, and ID 0x1F configures Channel 4.
All velocity values in the low-frequency sensor are in units of inches/sec and represent peak value derived from the
root-mean-squared calculation: peak velocity = RMS * 1.414.
The desired low frequency velocity threshold values must be multiplied by 100 for the configuration value. For
example, if the desired low-frequency threshold is 1.1 in/sec, then the threshold value would be 110 or 0x6E. Thus,
the resolution of the velocity values is 0.01 in/sec with a max value of 2.55 in/sec.
The desired high frequency g-force threshold values must be multiplied by 4 for the configuration value. For
example, if the desired high-frequency threshold is 2.5g, then the threshold value would be 10 or 0x0A. Thus, the
resolution of the g-force values is 0.25g with a max value of 63.75g.
22
Description
Total energy values, bands 0-3 in bytes 1-8 (16 bit
values)
Total energy values, bands 4-7 in bytes 1-8 (16 bit
values)
Peak energy values, bands 0-3 in bytes 1-8 (16 bit
values)
Peak energy values, bands 4-7 in bytes 1-8 (16 bit
values)
Description
Control byte (see Control Byte below)
Periodic reporting (see Periodic Reports below)
Low frequency upper threshold in inches/second
Low frequency lower threshold in inches/second
High frequency upper threshold in g-force
High frequency lower threshold in g-force
Sampling duration (see Sampling Duration section
below)
Reveal™ Wireless Vibration Sensor User Guide