Measurement-computing Analyzer488 Instrukcja Użytkownika Pobierz pdf (Strona 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

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

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 280 281

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Measurement-computing Analyzer488 Instrukcja Użytkownika Strona 99