Measurement and Control Module Operators Manual
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Measurement and Control Module CR10
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SECTION 6. 9-PIN
SERIAL INPUT/OUTPUT
6-8
22
RI
I
Ring Indicator: The
modem raises this line to
tell the terminal that the
phone is ringing.
7
SG
Signal Ground: Voltages
are measured relative to
this point.
1
...
...
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