Measurement-computing PPIO-AI08 Instrukcja Użytkownika Strona 13
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5.3.1 A/D Data Registers
BASE + 0
A/D8A/D7A/D6A/D5A/D4A/D3A/D2A/D1
MSB
01234567
READ
On read, the most significant A/D byte is read. Note that since data is read through
the parallel port four bits at a time, two reads are required to obtain the entire byte
from this register.
The table below has coding for input voltages.
0 volts
−Full Scale
00
½ Full Scale0 Volts8002048
y Full Scaley Full ScaleFFF4095
UNIPOLARBIPOLARHEXDECIMAL
WRITE
Writing to this register starts a 12-bit A/D conversion.
A note of caution:
Place a program loop of at least 25
µ
s delay between consecutive 12
bit A/D conversions to avoid over-running the A/D converter.
BASE + 1
0000A/D12
LSB
A/D11A/D10A/D9
01234567
A read/write register.
READ
On read, it contains the least significant four digits of the Analog input data.
These four bits of analog input data must be combined with the eight bits of analog
input data in
BASE + 0, forming a complete 12 bit number. The data is in the formof
0 = minus full scale. 4095 = +FS.
WRITE
Writing any data to the register causes an immediate 8-bit A/D conversion.
9
- PPIO-AI08 1
- User’s Manual 1
- HM PPIO-AI08.lwp 2
- Table of Contents 3
- This page is blank 4
- 1 INTRODUCTION 5
- 2 SOFTWARE INSTALLATION 5
- 3 HARDWARE INSTALLATION 6
- PPIO power cable 7
- 4 SIGNAL CONNECTION 8
- 4.2.1 Analog Inputs 9
- 4.2.2 Single-Ended Inputs 9
- 5 REGISTER ARCHITECTURE 10
- 5.3 PPIO-AI08 REGISTERS 12
- 5.3.1 A/D Data Registers 13
- 6 SPECIFICATIONS 15
- ENVIRONMENTAL 16
- For your notes 17
- Declaration of Conformity 19
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