Theory of Operation
4–20
1735 HD High Definition Waveform Monitor
Master Slave Interface.
The slave microprocessor (U11) acts as the main link
between the master microprocessor and the hardware of the instrument. Constant
serial communications between the processors keep the slave informed of any
front panel changes. The slave then configures the instrument hardware to
produce the correct display. The slave is also responsible for handling line
counting in LINE SELECT mode.
Master Remote Interface.
U17 and U25 are non-inverting tri-state buffers. They
provide the means for the master microprocessor to poll the status of the
REMOTE input connector (J401) through J3. Both A0 and /RD from the master
microprocessor must be low to read the TTL levels on J3. If either of these lines
goes high, the buffer goes to the high impedance state.
Input / Output
Diagram <11>
Summary of Contents for 070-8462-03
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