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The Governor feature of the RBM101 will measure the time between 10 consecutive
messages and take one of the following actions:
1. If the time intervals between the consecutive periodic messages are less than 10 seconds,
then the module will reject subsequent consecutive messages that occur with intervals
under 10 seconds and return an error to the host.
2. If the time intervals are between 10 seconds and 1 hour and the variation of the time
intervals is less than 10% (considered periodic), then the messages will be allowed as long
as the transmit power has been reduced to the FCC Part 15.231 periodic message power
level using the RP (reduce power) AT command.
3. If the time interval is greater than 1 hour, then the message is not considered periodic
and no action is taken by the governor.
The governor will automatically reset and resume normal operation when a new message is
sent outside of the periodic time interval.
Example 1: If the RBM101 receives a request to transmit 20 messages each spaced by exactly
5 seconds, the first 10 messages would be allowed to transmit and messages 11-20 would be
rejected. If the 21
transmitted and the governor is no longer blocking messages.
Example 2: If the RBM101 receives a request to transmit 20 messages each spaced by exactly
30 seconds and the RP AT command has not been used to reduce the transmit power, then
messages 11-20 will be rejected.
Example 3: If the RBM101 receives a request to transmit 20 messages each spaced by exactly
30 seconds and the RP AT command is first used to reduce the transmit power, then all 20
messages are transmitted at the reduced power level.
Example 4: If the RBM101 receives a request to transmit 20 messages each spaced by exactly
1.5 hours, then all 20 messages are sent with no governor actions taken.
The only exception to the governor limitations would be an "emergency" message as allowed
by the FCC. There is an emergency packet type as defined by the EP (emergency packet) AT
command that can be sent any time even when the governor is engaged. This command
should only be used for messages related to safety such as security system alarms, fire alarms,
personal emergency response (PERS) alerts, etc.
Note that the governor is put in place to keep users from unintentionally violating the FCC
limitations. If an end user intentionally uses command sequences to work around the
governor, this would be considered in violation of FCC limitations. Examples of intentionally
bypassing the governor and violating FCC limitations could include:
-
Adding random delays or jitter into the periodic messages
-
Sending random messages to reset the monitoring sequence
-
Using emergency packet types for general payload
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