Supervisory Message 0X01; Link Quality Message 0Xfb - Multitech Reveal User Manual

Supervisory Message 0x01

Wireless sensors periodically send a supervisory message so the backend system can verify the device is still alive
and report error conditions. The supervisory message payload include current sensor status.
The following table shows the supervisory message payload:
Bytes Description
0 Supervisory error codes as follows:
Bits
7:5
4
3
2
1
0
1 Current sensor state, 1-byte. This is device specific, refer Sensor Specific Messages chapter for details.
For other devices, use the periodic reporting feature.
2 Battery level is a two-digit battery voltage. For example, if the battery voltage is 2.9V, byte 2 would be
0x29.
3-6 Extended sensor state, 4-bytes. Allows sensors with higher precision or multiple values to report
during a supervisory event. For other devices, use the periodic reporting feature.
7-8 Event accumulation count is the number of sensor events since the last supervisory message. To
improve battery life, can be used with the Disable all sensor events setting so only an event total is
reported during a supervisory message, individual events are not reported as they occur. This feature
is available in firmware v2.0 and beyond.

Link Quality Message 0xfb

The link quality message provides a signal strength and a signal to noise measurement at the device itself. The link
quality message payload is shown in the following table.
Bytes Description
0 Current Sub-Band, sub-band currently joined and used for communication to the gateway and
network server. Value ranges from 1-8 for US915. For other regions, value depends on available
channels.
1 RSSI of last DOWNLINK received, signed integer format values in bytes 1 and 2 in two's complement
format.
2 SNR of last DOWNLINK received, signed integer format values in bytes 1 and 2 in two's complement
format.
TM
Reveal Wireless Dual Push Button User Guide
Description
Not used.
Tamper detected since last reset.
Current tamper state.
Error with last downlink.
Battery low (under 2.8v).
Radio communication error, communication with the integrated radio failed and the
device was reset.
COMMON MESSAGES
11