Raveon FireLine MURS band Technical Manual page 46

the user is send data into the modem at 9600 baud, the modem will negate the
CTS signal once the FireLine's internal data buffers become full.
CD
On this line the modem indicates to the DTE that it has received a carrier from a
remote device. It will assert this signal any time there is a carrier detected. The
modem may be configured to assert this when an RF carrier is detected (any on-
channel RF, voice or data), assert it only when another RF modem signal is
detected, or always assert it. The operation of this line is configured with the
ATR1 command. The default is 1 (asserts when FireLine data is detected on the
radio receiver).
DTR
This line is an input to the FireLine. It is normally ignored because the default
configuration of the FireLine modem is to ignore this signal. If the DTR line is
enabled for use, using the ATK5 1 command, the DTR input line can be used to
put the FireLine modem into its SLEEP mode. With DTR enabled, anytime the
DTR line is a logic 0, the FireLine will be operating normally. With DTR enabled,
anytime the DTR line is a logic 1, the FireLine will go into a SLEEP mode,
drawing much less DC power.
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