Agilent Technologies E1330B Instrukcja Użytkownika Pobierz pdf (Strona 50)

48 Understanding the Agilent E1330B Digital I/O Module

Chapter 4

PARTial The PARTial handshake makes use of both the CTL and FLG lines. The

input and output operations are described below.

INPUT OUTPUT

1 The Digital I/O module sets the

I/O

line HIGH.

1 The Digital I/O module sets the

I/O line LOW.

2 The Digital I/O module sets CTL

TRUE.

2 The Digital I/O module places the

data on the data lines.

3 The peripheral senses the CTL

line and sets the data lines.

3 After waiting the programmed

delay time, Td, the Digital I/O

module sets CTL to TRUE.

4 The peripheral holds the FLG

line READY for at least

250 nsecs and then sets the FLG

line BUSY to indicate the data is

valid.

4 The peripheral senses the CTL

line change, sets the FLG line to

READY for a minimum of

250 nsecs, latches the data, and

sets the FLG line to BUSY.

5 The Digital I/O module senses

the FLG line change to BUSY

and latches the data.

5 The Digital I/O module senses

the change of the FLG line and

sets CTL to FALSE.

6 The Digital I/O module then sets

the CTL line FALSE.

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Agilent Technologies E1330B Instrukcja Użytkownika Strona 50