Agilent Technologies E1330B Instrukcja Użytkownika Pobierz pdf (Strona 49)

Understanding the Agilent E1330B Digital I/O Module 47

Chapter 4

PULSe The PULSe 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 senses the

FLG line and waits for READY.

1 The Digital I/O module checks the

state of the FLG line (must be

READY).

2 The Digital I/O module sets the

I/O

line HIGH.

2 The Digital I/O module sets the

I/O line LOW.

3 The Digital I/O module sets CTL

TRUE.

3 The Digital I/O module places the

data on the data lines.

4 The peripheral senses the CTL

line and sets the FLG line to

BUSY.

4 After waiting the programmed

delay time, Td, the Digital I/O

module sets CTL to TRUE.

5 The peripheral places the data on

the data lines and indicates valid

data by setting the FLG line to

READY.

5 The Digital I/O module then waits

another delay time, Td, and sets

the CTL line to FALSE.

6 The Digital I/O module senses the

FLG READY, returns CTL to

FALSE, and latches the input

data.

6 The peripheral senses the CTL

line change, sets the FLG line to

BUSY and latches the data.

7 When the data is entered, the

peripheral returns the FLG line to

READY.

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Agilent Technologies E1330B Instrukcja Użytkownika Strona 49