CHAPTER 6: IEEE 488 Primer
6.7.3UNLISTEN (UNL)
This command tells all bus devices to Unlisten. The same as Unaddressed to Listen. ($3F)
6.7.4TALK 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.
6.7.5 UNTALK (UNT)
This command tells bus devices to Untalk. The same as Unaddressed to Talk. ($5F)
6.7.6LOCAL LOCKOUT (LLO)
Issuing the LLO command prevents manual control of the instrument’s functions. ($11)
6.7.7DEVICE CLEAR (DCL)
This command causes all bus devices to be initialized to a predefined or
6.7.8SELECTED DEVICE CLEAR (SDC)
This causes a single device to be initialized to a
6.7.9SERIAL POLL DISABLE (SPD)
The SPD command disables all devices from sending their Serial Poll status byte. ($l9)
6.7.10SERIAL POLL ENABLE (SPE)
A device which is Addressed to Talk will output its Serial Poll status byte after SPE is sent and ATN is unasserted. ($18)
6.7.11GROUP EXECUTE TRIGGER (GET)
This command usually signals a group of devices to begin executing a triggered action. This allows actions of different devices to begin simultaneously. ($08)
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