Measurement-computing Digital232 Uživatelský manuál stáhnout pdf (Strana 18)

Section 2 Getting Started

2.10

2.3.3 Control Lines

Five control lines enable handshaking of digital I/O data transfer to the

Digital232

. They are automatically activated with the corresponding I/O activity

and can also be independently activated with the

Handshake

(

)

command.

2.3.3.1 Clear

(Pin 41)

The

Clear

output is pulse for approximately 50 microseconds at power-on,

or upon receipt of the

RESET

(

) command. The

Clear

line is normally

active high. The

Invert

command (

) will program it active low. The

Handshake

command

(H0)

can pulse the

Clear

line, independent of any I/O

operations.

TIMING DIAGRAM FOR CLEAR OUTPUT

2.3.3.2 Data Strobe

(Pin 42)

The

Data Strobe

output is pulse for approximately 50 microseconds after

new data is output on the I/O port. The

Data Strobe

line is normally active

high but may be programmed active low by the

Invert

command (

). The

Handshake

command

(H1)

can pulse the

Data Strobe

line, independent of an

I/O operations.

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