Smdad1Getvraw - PEP Modular Computers Modular Computers RS485 User Manual

Chapter 5 Analog Modules

5.1.8.4 SMDAD1GetVRaw

Syntax
error_code SMDAD1GetVRaw(u_int8 PortNr, u_int8
Description
This function fetches the conversion result of a selected channel without
performing a gain or offset correction. The result is always a signed integer
value. If bipolar mode is selected, the function returns the 2's complement
value of the original read.
Input
u_int8 PortNr
u_int8 Channel
int16 *pValue
Output
error_code
Example
RetVal = SMDAD1GetVRaw(0, 2, 0x07FF);
Positive Full-Scale
March 12, 1996
SM-Port to be accessed
Number of the ADC input channel to access
(0-3)
Pointer to the location where the conversion
result will be stored
SUCCESS
E_SEEK
E-BMODE
or standard OS-9 error code (refer to the OS-9
Technical Manual Error Codes Section).
Value (16-bit HEX)
Unipolar
$07FF
+1LSB $0001
0 $0000
©1996 PEP Modular Computers GmbH
SMART I/O User's Manual
Channel, int16 *pValue);
if module was not initialized
if the module is unknown
Bipolar
Positive Full-Scale
+1LSB
-1LSB
Negative Full-Scale
$07FF
$0001
$FFFF
$F800
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