Omega-engineering OME-A826PG Manual do Utilizador descarregar pdf (Página 40)

OME-A-826PG Software Manual [Win 95/98/NT]

3.3 A/D , D/A Functions

3.3.1 A826_AD

• Description :

This subroutine will perform a A/D conversion by polling. The A/D converter is

16 bits for A82PG. This subroutine will compute the result according to the

configuration code

• Syntax :

float A826_AD(WORD wBase, WORD wChannel, WORD wConfig);

• Parameter :

wBase : [Input] I/O port base address, for example, 0x220

wChannel : [Input] A/D channel number,

wConfig : [Input] Configuration code, refer to 1.2 for detail information

• Return Value :

AdError2 : A/D converter error

Other value : The floating point value of A/D conversion

3.3.2 A826_DA

• Description :

This subroutine will send the 16 bits data to D/A analog output. The output

range of D/A maybe 0 to 5V or 0 to10V setting by hardware jumper, JP1. The

software can not detect the output range of D/A converter. For examples, if

hardware select -5V, the 0xfff will send out 5V. If hardware select -10V, the

0xfff will send out 10V. The factory setting select 0-5V D/A output range.

• Syntax :

WORD A826_DA(WORD wBase, WORD wChannel, WORD wHexValue);

• Parameter :

wBase : [Input] I/O port base address, for example, 0x220

wChannel : [Input] D/A channel number, validate for 0

wHexValue : [Input] 16 bits data send to D/A converter

• Return Value :

NoError : no error

DaChannelError : wChannel value error, validate only for 0

Date: Aug-15-2000 Ver: 2.2 Page 38

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Omega-engineering OME-A826PG Manual do Utilizador Página 40