C-4 IEEE-488 Bus Overview Model 6220/6221 Reference Manual
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Figure C-1
IEEE-488 bus configuration
Bus lines
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 commands, 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.
Device 1
able to talk,
listen, and
control
(computer)
Device 2
able to talk
and listen
622x
Device 3
only able to
listen
(printer)
Device 4
only able to
talk
DAV
NRFD
NDAC
IFC
ATN
SRQ
REN
EOI
Data Bus
Data Byte
Transfer Control
General Interface
Management
DIO 18 Data
(8 Lines)
Handshake
Bus
Management
To Other Devices
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