Section 5 IEEE 488 Primer

5.4

5.3 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 product'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).

5.4 Bus Management Lines

Five hardware lines on the GPIB are used for bus management. Signals on these lines are often

referred to as uniline (single line) commands. The signals are active low, i.e. a low voltage represents a

logic "1" (asserted), and a high voltage represents a logic "0" (unasserted).

5.4.1 Attention (ATN)

ATN is one of the most important lines for bus management. If Attention is asserted, then the

information contained on the data lines is to be interpreted as a multiline command. If it is not, then

that information is to be interpreted as data for the Active Listeners. The Active Controller is the only

bus device that has control of this line.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 50 51

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