Filter
Top Products
59
CHAPTER 6: IEEE 488 Primer
6.7.3 U
NLISTEN
(UNL)
This command tells all bus devices to Unlisten. The same as Unaddressed to
Listen. ($3F)
6.7.4 T
ALK
A
DDRESS
G
ROUP
(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 U
NTALK
(UNT)
This command tells bus devices to Untalk. The same as Unaddressed to Talk.
($5F)
6.7.6 L
OCAL
L
OCKOUT
(LLO)
Issuing the LLO command prevents manual control of the instrument’s
functions. ($11)
6.7.7 D
EVICE
C
LEAR
(DCL)
This command causes all bus devices to be initialized to a predefined or
power-up state. ($14)
6.7.8 S
ELECTED
D
EVICE
C
LEAR
(SDC)
This causes a single device to be initialized to a pre-defined or power-up state.
($04)
6.7.9 S
ERIAL
P
OLL
D
ISABLE
(SPD)
The SPD command disables all devices from sending their Serial Poll status
byte. ($l9)
6.7.10 S
ERIAL
P
OLL
E
NABLE
(SPE)
A device which is Addressed to Talk will output its Serial Poll status byte after
SPE is sent and ATN is unasserted. ($18)
6.7.11 G
ROUP
E
XECUTE
T
RIGGER
(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)