2 listen address group, 3 unlisten, 4 talk address group – Measurement Computing Parallel488 User Manual

Page 40: 5 untalk, 6 local lockout, 7 device clear

Section 5

IEEE 488 Primer

5.8

5.7.2 Listen Address Group (LAG)

There are 31 (0 to 30) listen addresses associated with this group. The 3 most significant bits

of the data bus are set to 001 while the 5 least significant bits are the address of the device being told
to listen.

5.7.3 Unlisten (UNL)

This command tells all bus devices to Unlisten. The same as Unaddressed to Listen. ($3F)

5.7.4 Talk Address Group (TAG)

There are 31 (0 to 30) talk addresses associated with this group. The 3 most significant bits of

the data bus are set to 010 while the 5 least significant bits are the address of the device being told to
talk.

5.7.5 Untalk (UNT)

This command tells bus devices to Untalk. The same as Unaddressed to Talk. ($5F)

5.7.6 Local Lockout (LLO)

Issuing the LLO command prevents manual control of the instrument's functions. ($11)

5.7.7 Device Clear (DCL)

This command causes all bus devices to be initialized to a pre-defined or power up state. ($14)