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Section 2 Getting Started

2.11

TIMING DIAGRAM FOR STROBE OUTPUT

2.3.3.3 External Data Ready

[EDR]

(Pin 46)

The

External Data Ready

[

EDR

] line is an edge sensitive input which is

used to latch input data. It is used in conjunction with the

Data Ready

command (

). The

EDR

signal must be at least 1 microsecond wide and must

have a rise and fall time of less than one microsecond. The

EDR

line is

normally rising-edge sensitive but can be programmed with the

Invert

command (

I32

) to be falling-edge sensitive. Refer to the following diagram for

timing relationships.

When using the

EDR

line the

Digital232

will only output data when the

EDR

line transitions.

2.3.3.4 Inhibit

(Pin 44)

The

Inhibit

output is asserted while data on the selected I/O port is being

read into the I/O port buffer. This line is normally active high but may be

programmed active low by the

Invert

command (

). The

Inhibit

line can be

programmed independent of any I/O operations with the

Inhibit

command

(

)

Refer to the following diagram for timing relationships.

The

Inhibit

line is asserted once for each data read operation for all format

[

] modes.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 58 59

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Measurement-computing Digital232 Manuale Utente Pagina 19

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