Section 5
5-3
1. DAV (DATA VALID) is used to indicate the condition of (availability and validity)
information on the DIO signal lines.
2. NDAC (NOT DATA ACCEPTED)
3. NRFD (NOT READY FOR DATA) is used to indicate the condition of readiness
of devices to accept data.
4. SRQ (SERVICE REQUEST) is used by a device to indicate the need for attention
and to request an interruption of the current sequence of events.
5. REN (REMOTE ENABLE) is used (by a controller) in conjunction with other
messages to select between two alternate sources of device programming data.
6. EOI (END OR INDENTIFY) is used (by a talker) to indicate the end of a multiple
byte transfer sequence or in conjunction with ATN (by a controller) to execute a
polling sequence.
7. ATN (ATTENTION)
8. IFC (INTERFACE CLEAR)
5.2.5. Address And Talk/Listen Selection.
The IEEE-488 Address and Talk/Listen status can be set using the front panel controls as
directed by the operator menuing system.
If there is no controller and the 6675A is hooked up to a printer for hard copy then Talk
Only mode should be selected as the preferred mode of operation.
5.2.6. IEEE-488 Electrical Interface.
The 6675A meets the subsets of the IEEE-488 interface specification IEEE-488.1 shown in
Table 5-2. The pin connections on the IEEE-488 interface connector are shown in Table 5-
1.
5.2.7. IEEE-488 Input Buffering.
The IEEE-488 input buffer is 256 bytes long. The input full bit is set when the buffer is
above 75% full 64 bytes remaining.
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