Measurement Computing Extender488 - Manual (Page 28)

Section 3 IEEE 488 Primer
3-8
3.7.2 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.
3.7.3 Unlisten (UNL)
This command tells all bus devices to Unlisten. The same as Unaddressed to Listen. ($3F)
3.7.4 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.
3.7.5 Untalk (UNT)
This command tells bus devices to Untalk. The same as Unaddressed to Talk. ($5F)
3.7.6 Local Lockout (LLO)
Issuing the LLO command prevents manual control of the instrument's functions. ($11)
3.7.7 Device Clear (DCL)
This command causes all bus devices to be initialized to a pre-defined or power up state. ($14)