XX = don't care
$11 PTT
D0 Bit 0 = Pilot PTT. 1=active, 0=not active
Bit 1 = PAX PTT. 1-active, 0=not active
This message must be sent every 100 mS to keep a PTT active. It will timeout and cancel any
active PTT after 400mS if no further PTT command is received.
When the PTT is to be released it is recommended that at least one message is sent with the
corresponding PTT bit set to zero so the TX is released immediately.
There is no need to send this message when no PTT is active.
This command does not reply with an acknowledge message
$12 Increment channel and set active frequency
D0 Don't care (recommend to set to zero)
This function will set the active frequency to that stored in the next channel. If channel 100 is
exceeded will wrap to channel 1.
Sends acknowledge when message received OK
$13 Decrement channel and set active frequency
D0 Don't care (recommend to set to zero)
This function will set the active frequency to that stored in the previous channel. If channel 1
is exceeded will wrap to channel 100.
Sends acknowledge when message received OK
$14 Set channel and set active frequency
D0 Channel number 0-99 (channel 1-100)
This function will set the active frequency to that stored in the requested channel.
Sends acknowledge when message received OK
$15 Increment channel and set standby frequency
D0 Don't care (recommend to set to zero)
This function will set the standby frequency to that stored in the next channel. If channel 100
is exceeded will wrap to channel 1.
Sends acknowledge when message received OK
$16 Decrement channel and set standby frequency
D0 Don't care (recommend to set to zero)
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