RV-M7 Technical Manual
59
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.
CD Output Data Framing
Ouput Data Framing is used when it is necessary for the serial terminal to wake from sleep or enter
an appropriate mode to receive data. In this mode, the Carrier Detect handshaking line is nominally
high and only goes low to signal that data is being output. The Pre-Data and Post-Data time can be
set from 0-254ms, as indicated in the diagram below.
If Data Framing is enabled, any other Carrier Detect and flow control output configuration is
ignored. Set
ATS120 255
to disable.
Summary of Contents for RV-M7
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