Remote Operations
How to Use Commands 5
5-27
Table 5-4. IEEE-488 Interface Messages (Received) (cont.)
Mnemonic Name Function
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.
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 sends the
Status Byte the next it is addressed as a listener, no matter
what the command is.
UNL Unlisten “Unaddresses” a specific 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 specific device on the bus as a listener.
The controller sends UNL automatically after the device has
successfully received a device-dependent or common
query.
Table 5-5. IEEE-488 Interface Messages (Sent)
Mnemonic Name Function
END End A message that occurs when the Calibrator asserts the EOI
control line. The Calibrator asserts EOI while it transmits the
ASCII character LF for its termination sequence or
terminator.
DAC Data Accepted Set the handshake signal line NDAC low.
DAV Data Valid Asserts the handshake signal line DAV.
RFD Ready for Data Sets the handshake line NRFD low.
SRQ Service Request A control line that any device on the bus can assert to
indicate that it requires attention. Refer to “Checking
Calibrator Status” for details.
STB Status Byte The status byte is what the Calibrator sends when it
responds to a serial poll (interface message SPE).
Compound Commands
A compound command is two or more commands in a single command line. For
example, the following two commands could be entered individually,
OUT 1 V, 60 HZ
OPER
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