PCI-1002 Series Card
12-bit, 110 kS/s or 44 kS/s Multi-function Board
User Manual, Ver. 3.0, Jun. 2018, PMH-015-30, Page: 56
7.4
AD Conversion
An AD conversion can be initiated in one of three ways: software command, internal programmable
interval timer, or by external trigger to the AD. At the end of the AD conversion, it is possible to
transfer the data in two ways: by polling a status register and reading data when ready, or by
generating a hardware interrupt signal to call service routine. All operating modes are selected by a
control register on the PCI-1002 series.
Before using the AD conversion function, please follow this checklist:
AD data register (BASE+30h)
store the AD conversion data.
AD data conversion ready register (BASE +10h)
Check AD conversion ready.
AD gain control register (BASE+14h)
Select gain.
AD multiplex control register (BASE+10h)
Select analog input channel.
AD mode control register (BASE+18h)
Select trigger mode and interrupt source.
AD software trigger control register (BASE+1Ch).
JP1 to select single-ended or differential input.
3 Trigger logic: Software, Pacer or External trigger.
2 Transfer logic: Polling or Interrupt.
Here’s the block diagram:
CN3
16/8 to 1
Multi-
plexer
Gain
Control
12 bits
AD
Buffer
Memory
BASE+30h
CPU
Trigger
Logic
BASE+14h
BASE+10hHgh
BASE+1Ch
Software Trigger
