![abaco systems CEI-100 Series User Manual Download Page 186](http://html.mh-extra.com/html/abaco-systems/cei-100-series/cei-100-series_user-manual_450728186.webp)
CEI-100/CEI-200/CEI-
x20 User’s Manual
174
APPENDIX
C
Parametric Voltage Programming
Introduction
Some members of the CEI-x20 family provide the option of adjusting the
output voltage levels, and adjusting the input threshold levels for the serial
communications channels.
The parameters needed to program the DAC levels vary among the
members of the CEI-x20 family; therefore, your code needs to be specific
for the board type you are trying to control.
The voltage adjustments are provided by a group of Digital to Analog
Converters (DAC) that are programmable through the API. These
parameters are set using a call to AR_SET_CONFIG or
AR_SETCHPARMS (preferred). You should use the information given
here to determine the values that should be passed to the API functions.
All DAC output voltages are defined by the following relationship:
31 - 8
7-0
X
DAC output voltage = 5V * n / 256
This limits the range of valid DAC values to between 0 and 255. The
values needed to program the DAC registers are defined in the following
sections.
CEI-220 DAC Definitions
The DAC outputs used to control the functions of the CEI-220 board are
defined as follows:
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com