Measurement Computing Digital HS - Manual (Page 47)

This command tells all bus devices to Unlisten. The same as Unaddressed to Listen.
($3F)
4.7.4 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.
4.7.5 Untalk (UNT)
This command tells bus devices to Untalk. The same as Unaddressed to Talk. ($5F)
4.7.6 Local Lockout (LLO)
Issuing the LLO command prevents manual control of the instrument's functions.
($11)
4.7.7 Device Clear (DCL)
This command causes all bus devices to be initialized to a pre-defined or power up
state. ($14)
4.7.8 Selected Device Clear (SDC)
This causes a single device to be initialized to a pre-defined or power up state. ($04)