Fluke 5502A - Page 171

Remote Operation
Use Commands 5
5-29
Table 5-4. IEEE-488 Interface Messages (Received)
Mnemonic Name Function
ATN Attention
A control line that, when asserted, tells all instruments on
the bus that the subsequent data bytes are an interface
message. When ATN is low, the subsequent data bytes
are interpreted as device-dependent or common
commands addressed to a specified instrument.
DAC Data Accepted Sets the handshake signal line NDAC low.
DAV Data Valid Asserts the handshake signal line DAV.
DCL Device Clear Clears the input/output buffers.
END End
A message that occurs when the Controller asserts the
EOI signal line before it sends a byte.
GET Group Execute Trigger
Trigger a TC measurement and put the indication in the
output buffer.
GTL Go To Local
Transfer control of the Calibrator from one of the remote
conditions to one of the local conditions, see Table 5-1.
LLO Local Lockout
Transfers remote/local control of the Calibrator, see
Table 5-1.
IFC Interface Clear
A control line that sets the interface to a quiescent
condition.
MLA My Listen Address
Addresses a specified device on the bus as a listener.
The controller sends MLA automatically when it tells a
device-dependent or common command to a specified
instrument.
MTA My Talk Address
Addresses a specified device on the bus as a talker. The
controller sends MTA automatically whenever it directs a
device-dependent or common query to a specified
instrument.
REN Remote Enable
Transfer remote/local control of the Calibrator, see Table
5-1.
RFD Ready For Data Sets the handshake signal line NRFD low.
SDC Selected Device Clear
Does the same thing as DCL, but only if the Calibrator is
currently addressed as a listener.
SPD Serial Poll Disable Cancels the effect of a Serial Poll Enable.
SPE Serial Poll Enable
After the Calibrator receives this message, it will show the
Status Byte the next time it is addressed as a talker over
the GPIB interface.
UNL Unlisten
“Unaddresses” a specified device on the bus as a listener.
The controller sends UNL automatically after the device
has successfully received a device-dependent or common
command.
UNT Untalk
“Unaddresses” a specified device on the bus as a listener.
The controller sends UNL automatically after the device
has successfully received a device-dependent or common
query.