Explain why three wires are required for the handshaking technique employed by IEEE 488 bus systems.
Find:
Explain why three wires are required for the handshaking technique employed by IEEE 488 bus system.
Analysis:
Details on the IEEE 488 bus are presented in graphical form via Figure 17.17. It shows that the standard calls for three handshake lines, DAV (data valid), NRFD (not ready for data), and NDAC (data not accepted). The three-wire handshake requires the listener to unassert Not Ready for Data (NRFD), the talker to assert the Data Valid (DAV) signal to indicate to the listener that a data byte is available, and the listener to unassert the Not Data Accepted (NDAC) signal when it has accepted that byte.
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