Measurement-computing Digital488 Instrukcja Użytkownika Pobierz pdf (Strona 34)

Section 3 Command Descriptions

3.4

Bus Input/Output Gn

The

Bus Output

command determines whether input port data, output port data

or both will be transmitted on the bus when the

Digital488

is addressed to talk. The

amount of data sent is dependent on the

command.

The

default mode

causes all input and output port data to be sent to the

controller when addressed to talk. The

mode causes only data from the ports

programmed as inputs to be returned when addressed to talk. The

mode causes only

data from ports programmed as outputs to be returned when addressed to talk.

If all ports are programmed as outputs with

selected and the

Digital488

addressed to talk, nothing will be transmitted and the bus will hang. The converse will

also cause the bus to hang with all ports programmed as inputs and

selected.

Input and output

port data is send on talk

Only input port data is sent on talk

Only output port data is sent on talk

Example:

CLEAR 718

reset the

Digital488

OUTPUT 718;"P0C1X"

port1 as output, ports 2-5 as input

OUTPUT 718;"G1X"

select only input ports

ENTER 718; A$

read data from the input ports

DISP A$

display shows

FFFFFFFF

(data is

dependent on what is connected.

OUTPUT 718;"G2X"

select output ports

ENTER 718; A$

read data from the output ports

DISP A$

display shows

(outputs default to 0)

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 82 83

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