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525B
Users Manual
4-16
Table 4-6. IEEE-488 Interface Messages (Sent)
Mnemonic Name Function
END End A message that occurs when the 525B asserts the EOI
control line. The 525B 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 525B
Status” for details.
STB Status Byte The status byte is what the 525B 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
OPER
where the Calibrator sources 1 V dc, and then goes into operate, or they could be
combined into a compound command,
OUT 1 V ; OPER
using a semi-colon as a separator.
Overlapped Commands
Commands that begin execution but require slightly more time to complete are
called overlapped commands, because they can be overlapped by the next
command before they have completed execution.
In Chapter 5, the command graphic
Overlapped
x
shows a check for overlapped
commands.
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