Measurement-computing Analyzer488 Instrukcja Użytkownika Pobierz pdf (Strona 152)

Section 4 Serial Controller

4.58

READ

The

READ

command is used to accept data from the bus when in the Low Level

Controller Mode and return a machine readable bus status string.

READ

may only be used when the Analyzer488 is in the Listen State (see

LISTEN

) and handshaking is set to

STEP

(see

HANDSHAKE

READ

performs an

acceptor handshake. The

STEP

command is not required when using the

READ

command since the handshake is automatically performed when

READ

is executed.

This command does not have a query option.

TYPE Low Level Controller command

SYNTAX READ

RESPONSE Response is dependent on the data currently on the bus. Two

hexadecimal bytes are returned in the following format:

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

MODE Low level controller

BUS STATES None

QUERY None

RESPONSE

EXAMPLES PRINT#1,"CONTROLLER OFF"

PRINT#1,"ASSERT IFC ATN REN"

PRINT#1,"UNASSERT IFC"

PRINT#1,"TALK"

PRINT#1,"HANDSHAKE STEP"

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 280 281

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Measurement-computing Analyzer488 Instrukcja Użytkownika Strona 152