Remote Operation
The IEEE-488 Connector 5
5-59
Table 5-9. Interface Messages Accepted by the calibrator (continued)
MTA My Talk Address Addresses a specific device on the bus as a
talker. The controller sends MTA automatically
whenever it directs a device-dependent or
common query to a specific instrument.
None
REN Remote Enable Transfers remote/local control of the calibrator.
(See Table 5-5.)
REMOTE
RFD Ready For Data Set the handshake signal line NRFD low. None
SDC Selected Device
Clear
Identical to DCL, but only operates when the
calibrator is addressed as a listener.
CLEAR
SPD Serial Poll Disable Cancels a Serial Poll Enable. Part of SPL
SPE Serial Poll Enable Causes the calibrator to return a Status Byte to
the next command that address it as a listener,
no matter what the command is.
Part of SPL
UNL Unlisten “Unaddresses” a specific device on the bus as a
listener. The controller send UNL automatically
after the device has successfully received a
device-dependent or common command.
None
UNT Untalk “Unaddresses” a specific device on the bus as a
listener. The controller sends UNT automatically
after it receives the response from a device-
dependent or common query.
None
Table 5-10. Interface Messages Sent by the Calibrator
Mnemonic Name Function
END End A message that appears when the calibrator asserts the EOI control
line, which happens when the calibrator transmits the ASCII character
LF for its termination sequence or terminator.
DAC Data Accepted Sets the handshake signal line NDAC low.
DAV Data Valid Asserts the handshake signal line DAV.
RFD Ready For Data Sets the handshake signal line NRFD low.
SRQ Service Request A control line that can be asserted by any device on the bus to indicate
that it requires attention. For details, see “Checking the Calibrator’s
Status.”
STB Status Byte The response sent to a serial poll (SPE) by the calibrator.
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