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Remote Operation
Using Commands
4
4-15
Table 4-5. IEEE-488 Interface Messages (Received)
Mnemonic Name Function
ATN Attention
A control line that, when asserted, notifies all instruments on the bus
that the next data bytes are an interface message. When ATN is
low, the next data bytes are interpreted as device-dependent or
common commands addressed to a specific 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 sending a byte.
GET
Group Execute
Trigger
Trigger a TC measurement and put the reading in the output buffer.
GTL Go To Local
Transfer control of the 525B from one of the remote states to one of
the local states. (See Table 4-2)
LLO Local Lockout Transfers remote/local control of the 525B. (See Table 4-2)
IFC Interface Clear A control line that sets the interface to a quiescent state.
MLA
My Listen
Address
Addresses a specific device on the bus as a listener. The controller
sends MLA automatically whenever it directs a device-dependent or
common command to a specific instrument.
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 525B. (See Table 4-2.)
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 525B is currently
addressed as a listener.
SPD
Serial Poll
Disable
Cancels the effect of a Serial Poll Enable.
SPE
Serial Poll
Enable
After the 525B receives this message, it sends the Status Byte the
next if 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.
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