HP 8921A, Руководство программиста

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53
Chapter 1, Using HP-IB
IEEE 488.1 Remote Interface Message Capabilities
Clear Lockout/
Set Local Yes The Test Set returns to local mode (front-panel control)
and local lockout is cleared when the REN bus control line
goes false. When the Test Set returns to local mode the
output signals and internal settings remain unchanged,
except that triggering is set to TRIG:MODE:SETT
FULL;RETR REP. REN
Service Request Yes The Test Set sets the Service Request (SRQ) bus line true
if any of the enabled conditions in the Status Byte Regis-
ter, as defined by the Service Request Enable Register, are
true. SRQ
Status Byte Yes The Test Set responds to a Serial Poll Enable (SPE) bus
command by sending an 8-bit status byte when addressed
to talk. Bit 6 will be true, logic 1, if the Test Set has sent
the SRQ message SPE
SPD
STB
MTA
Status Bit No The Test Set does not have the capability to respond to a
Parallel Poll. PPE
PPD
PPU
PPC
IDY
Clear Yes This message clears the Input Buffer and Output Queue,
clears any commands in process, puts the Test Set into the
Operation Complete idle state and prepares the Test Set to
receive new commands. The Device Clear (DCL) or
Selected Device Clear (SDC) bus commands
• do not change any settings or stored data (except as
noted previously)
• do not interrupt front panel I/O or any Test Set
operation in progress (except as noted previously)
• do not change the contents of the Status Byte Register
(other than clearing the MAV bit as a consequence of
clearing the Output Queue).
The Test Set responds equally to DCL or SDC bus com-
mands.
DCL
SDC
MLA
Table 5 Test Set IEEE 488.1 Interface Message Capability (Continued)
Message Type Implemented Response
IEEE
488.1
Message