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CHAPTER 6: IEEE 488 Primer
Figure 6-1. IEEE 488 Bus Structure.
6.3 Send It to My Address
In the previous discussion, the terms
“
Addressed to Talk” and “Addressed to
Listen” were used. These terms require some clarification.
The IEEE 488 standard permits up to 15 devices to be configured within one
system. Each of these devices must have a unique address to avoid confusion.
In a similar fashion, every building in town has a unique address to prevent
one home from receiving another home’s mail. Exactly how each device’s
address is set is specific to the device’s manufacturer. Some are set by DIP
switches in hardware, others by software. Consult the manufacturer’s
instructions to determine how to set the address.
Addresses are sent with universal (multiline) commands from the Active
Controller. These commands include My Listen Address (MLA), My Talk
Address (MTA), Talk Address Group (TAG), and Listen Address Group
(LAG).
Device 1
System Controller
Able to Talk,
Listen, and Control
Device 2
DMM
Able to Talk
and Listen
Device 3
Printer
Only Able to Listen
Device 4
Frequency Counter
Only Able to Talk
To Other Devices
Data Bus
Data Byte
Transfer
Control
General
Interface
Management
DAV
NRFD
NDAC
IFC
ATN
SRQ
REN
EOI
DIO1-8