Section 5
5-5
┌──────────────────────┬───────┐
│ Source Handshake │ SH1 │
├──────────────────────┼───────┤
│ Acceptor Handshake │ AH1 │
├──────────────────────┼───────┤
│ Talker │ T5 │
├──────────────────────┼───────┤
│ Listener │ L3 │
├──────────────────────┼───────┤
│ Service Request │ SR1 │
├──────────────────────┼───────┤
│ Remote Local │ RL1 │
├──────────────────────┼───────┤
│ Parallel Poll │ PP0 │
├──────────────────────┼───────┤
│ Device Clear │ DC1 │
├──────────────────────┼───────┤
│ Device Trigger │ DT0 │
├──────────────────────┼───────┤
│ Controller │ C0 │
├──────────────────────┼───────┤
│ Electrical Interface │ E2 │
└──────────────────────┴───────┘
Table 5-2 : IEEE488 Device Capabilities
5.2.8. IEEE-488 Output Buffering.
Output from query commands are placed into a 256 byte output buffer. If for some reason
the controller does not read the responses from its query commands the output buffer will
overflow, in this case the first data into the buffer will still be valid and the later data will be
lost. When output data is lost the query error bit in the status register will be set. When the
output buffer is not empty then the message available (MAV) bit will be set in the status
register.
5.2.9. IEEE-488 Deadlock.
If the controller demands a byte of data from the 6675A and the buffer is empty, the 6675A
will set the Query Error flag in the Event Status Register.
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