Measurement-computing Digital232 Instrukcja Użytkownika Strona 19
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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 (
R1
). 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 (
I1
). The
Inhibit
line can be
programmed independent of any I/O operations with the
Inhibit
command
(
Qn
)
.
Refer to the following diagram for timing relationships.
The
Inhibit
line is asserted once for each data read operation for all format
[
Fn
] modes.
- Digital232 User’s Manual 1
- Table of Contents 3
- Introduction 5
- Section 1 Introduction 6
- GETTING STARTED 9
- S1 Factory Default Settings 10
- S2 Factory Default Settings 10
- Section 2 Getting Started 11
- COMMAND DESCRIPTIONS 23
- Y# Serial Terminator 45
- Y2 LF-CR 45
- Y3 CR-LF 45
- Service Information 49
- Digital 232 Command Summary 53
- IMB PC Interfacing 59
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