Measurement Computing Analyzer488 - Manual (Page 99)

Section 4 Serial Controller
4.5
4.7.2 Record Commands:
DUMP MEASURE RECORD SET
TRIGGER
ERASE
NEXT RELATIVE VIEW
FIND PRINT (?) SET RELATIVE ZERO
4.7.3 High Level Controller Commands:
ABORT LOCAL LOCKOUT REMOTE SPOLL
ADDRESS OUTPUT RESET PPOLL
CLEAR PPOLL CONFIG RESUME TRIGGER
ENTER PPOLL DISABLE SEND TERM
LOCAL PPOLL UNCONFIG
4.7.4 Low Level Controller commands:
ASSERT READ TALK WRITE
LISTEN STEP UNASSERT
4.8 Bus State Format
The state of the IEEE 488 bus management and data lines can be returned using
the VIEW or READ commands. The VIEW command returns the state of the bus
without performing a handshake. The READ command returns the state of the bus and
performs an acceptor handshake. Bus data is returned in two hexadecimal bytes,
formatted as shown below. If a line is asserted, the bit for that line will be a 1.
Hex Byte 1 Hex Byte 2
(bit positions) (bit positions)
(Control and Handshake Lines) (Data Lines)
8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
REN IFC SRQ EOI DAV NRFD NDAC ATN D8 D1
A response of 88F4 is interpreted as follows:
Byte 1, (88) Control and Handshake Line
The upper nibble (8) (%1000) = REN asserted.
The lower nibble (8) (%1000) = DAV asserted