User`s manual

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.