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Keithley 2000 Manual

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The signal lines on the IEEE-488 bus are grouped into three different categories: data
lines, management lines and handshake lines. The data lines handle bus data and com
-
mands, while the management and handshake lines ensure that proper data transfer and
operation takes place. Each bus line is active low, with approximately zero volts representing
a logic 1 (true). The following paragraphs describe the operation of these lines.
The IEEE-488 bus uses eight data lines that transfer data one byte at a time. DIO1 (Data
Input/Output) through DIO8 (Data Input/Output) are the eight data lines used to transmit both
data and multiline commands and are bidirectional. The data lines operate with low true log
-
ic.
The five bus management lines help to ensure proper interface control and management.
These lines are used to send the uniline commands.
ATN (Attention) — The ATN line is one of the more important management lines in that
the state of this line determines how information on the data bus is to be interpreted.
IFC (Interface Clear) — As the name implies, the IFC line controls clearing of instruments
from the bus.
REN (Remote Enable) —The REN line is used to place the instrument on the bus in the
remote mode.
EOI (End or Identify) — The EOI is usually used to mark the end of a multi-byte data trans-
fer sequence.
SRQ (Service Request) — This line is used by devices when they require service from
the controller.
E-6 IEEE-488 Bus Overview
2000-900 (J - Aug 2010) BOOK.fm Page 6 Wednesday, October 12, 2011 12:29 PM
… 241 …


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