User's Manual

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rate. For example, if the over-the-air data rate is set to 2400 baud, and the user
i
s send data into the modem at 9600 baud, the modem will negate the CTS
signal once the M7’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 M7 data is detected on the radio
receiver).
DTR
This line is an input to the M7. It is normally ignored because the default
configuration of the M7 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
M7 modem into its SLEEP mode. With DTR enabled, anytime the DTR line is a
logic 0, the M7 will be operating normally. With DTR enabled, anytime the DTR
line is a logic 1, the M7 will go into a SLEEP mode, drawing much less DC
power.