The GPIB transfers information in a similar way. This method of data transfer is called handshaking.
More on this later.
For data transfer on the IEEE 488, the Active Controller must…
a) Unlisten all devices to protect against eavesdroppers.
b) Designate who will talk by addressing a device to talk.
c) Designate all the devices that are to listen by addressing those
devices to listen.
d) Indicate to all devices that the data transfer can take place.
4-2, IEEE 488 Primer 11-20-01 Digital488 User’s Manual
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