Sensoray 421 Manual do Utilizador descarregar pdf (Página 24)

Page 22 Sensoray Model 421 Instruction Manual

A/D Interface Procedure

FUNCTION Digitize% (Chan%)

‘****************************************************************************

‘ Digitize one 421 analog input channel.

‘

‘ Imports:

‘ Chan% = A/D input channel in the range 0:7.

‘

‘ Exports:

‘ Digitize% = digitized value in the range 0:4095.

‘****************************************************************************

CONST BZ = 2 ‘ Status register mask: “A/D busy” flag

OUT CHCTRL, Chan% AND 7 ‘ Select analog input channel

‘ NOTE: you may need to insert a settling time delay here, depending on your programming

‘ language and processor speed.

OUT ADSTART, 0 ‘ Digitize the input

DO: LOOP WHILE INP(STATUSPORT) AND BZ ‘ Wait for A/D to finish

loResult% = INP(ADLSB) ‘ Read the digitized result

hiResult% = INP(ADMSB)

Digitize% = loResult% + 256 * (hiResult% AND &HF) ‘ Package result for function return

END FUNCTION

Board Reset Procedure

SUB reset421 ()

‘****************************************************************************

‘ Invoke 421 soft reset.

‘****************************************************************************

OUT RESETPORT, 0 ‘ Reset 421 board

chctrlImage% = 0 ‘ Initialize CHCTRL output port image

For i% = 0 To 2 ‘ Initialize relay images

relay%(i%) = 0

Next i%

END SUB

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Sensoray 421 Manual do Utilizador Página 24