advantest corporation TR5821 - Page 41

• The following signals are used on the handshake line.
DAV (Data Valid) ..................... Signal indicating validity and availability
of data.
NRFD (Not Ready For Data) . Indicates that the device is not ready
to receive data.
NDAC (Not Data Accepted) . . Indicates that data is not accepted.
• And the following signals are used on the control line.
ATN (Attension) ........................ Signal used to specify whether the data
line signal is an address or command, or
some other data.
IFC (Interface Clear) ................ Signal for clearing the interface.
EOI (End or Identify) ............. Signal used upon completion of data
transfer.
SRQ (Service Request) ............. Signal used in making a request for con
troller service from any device.
REN (Remote Enable) ............. Signal used in remote control of devices
with remote control capacity.
Fig. 4-1 GPIB outline
4-2