Pepper-computer Modular Computers RS485 User Manual download pdf (Page 178)

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101

SMART I/O User’s Manual

March 12, 1996

Page 5 - 22

Chapter 5 Analog Modules

5.1.8.7 SMDAD1PutV

Syntax

error_code SMDAD1PutV(u_int8 PortNr, u_int8 Channel,

int16 Value);

Description

This function sets the selected DAC channel to the chosen value. A gain and

offset correction is performed with the use of the automatically selected

conversion table depending whether a user-defined table has been specified

or not. Hence, if a user-defined table exists then this will be used, otherwise

the default factory set table will be used.

Input

u_int8 PortNr

SM-Port number to be accessed

u_int8 Channel

Number of the DAC output channel to access

(0-1)

int16 Value

Value to be written

Output

error_code SUCCESS

E_SEEK

if module was not initialized

E-BMODE

if the module is unknown

or standard OS-9 error code (refer to the OS-9

Technical Manual Error Codes Section).

Example

RetVal = SMDAD1PutV(0, 1, 0x7FF);

Value (16-bit HEX)

Unipolar Bipolar

Positive Full-Scale $0FFF Positive Full-Scale $07FF

+1LSB $0001 +1LSB $0001

0 $0000 0 $0000

-1LSB $FFFF

Negative Full-Scale $F800

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