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Legal Considerations
If the transcoder is to be used with a transceiver operating in the 260MHz
to 470MHz ISM band in the United States under Part 15.231, then there
are some legal requirements that need to be considered. The FCC requires
that the transmission control something, so the transcoder cannot be
used simply for passing data. The data lines and CONFIRM line must be
connected to something that turns on or off, such as a motor, LED, buzzer,
or display. Application Note AN-00128 goes into this in detail.
The transcoder has the ability to be automatically activated with the Write
Status Inputs command through the SIE. The FCC requires that any
automatic transmission cease within 5 seconds of activation. The MT
could exceed this time depending on the baud rate used, the options
that are enabled, and the number of packets that are sent. Table 3 shows
the packet time at each baud rate with the various options enabled or
disabled. The designer needs to be aware of the time depending on the
options that are in use and adjust the packet counter in the command to
ensure that the total time does not exceed 5 seconds. Application Note
AN-00157 goes into the serial commands in more detail and Application
Note AN-00125 goes into the FCC regulations under Part 15.231.
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