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MODEL 64000
SYSTEM OVERVIEW MANUAL
Sequence of Major Events
a. DTR is true from user's DTE. DSR is provided to the DTE by returning DTR.
NOTE
If no connection to DTR exists, DTR is set true (+12V) by an
internal pull-up circuit.
b. When
GJ
(To)
is pressed, a true CARDET is given the DTE. The development station
instantaneously begins data transmission which is outputted on Pin 3 (Rx).
NOTE
The CARDET signal is generated by the development station.
The development station requires a true DTR signal to
transmit. If no connection is made to DTR, the DTR line is set
true by an internal pull-up circuit.
c. CARDET is lowered (false) following completion of transmitted message (TN).
NOTE
The development station will place Rx data (Pin
3)
in a steady
mark state (-12V) between messages.
2-75
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