Hanna-instruments PCA 300 Series Manual do Utilizador descarregar pdf (Página 55)

INTERFACE WITH PC (PCA 300 and PCA 301 only)

A serial interface permits the PCA 300 and PCA 301 to

have direct connection with a computer. Connection with

a computer allows collecting, storing or printing of the

sample concentration data.

Data transmission from the instruments to the

PC is possible with the HI92000 Windows

compatible application software offered by

Hanna Instruments.

Refer to the drawing for proper wire connec-

tions.

Serial port set up is: 1200 baud, no parity, 8 bits per byte,

one stop bit (can not be changed by the operator).

A simple example written in Microsoft QBASIC shows how

to read/print concentration data from the analyzer:

OPEN “COM1: 1200,N,8,1,CD0,CS0,DS0,OP0,RS,

TB2048,RB2048” FOR RANDOM AS #1

CLS

PRINT #1, “1” ‘INITIALIZE PORT 1

COM(1) ON ‘ENABLE EVENT TRAPPING

‘ON PORT 1

ON COM(1) GOSUB ComHandler

‘PROVIDE INTERRUPT NAME

DO: LOOP WHILE INKEY$ <> “ “

‘LOOP UNTIL ANY KEY IS

‘PUSHED, THEN EXIT

COM(1) OFF

END

ComHandler:

‘INTERRUPT SUBROUTINE TO

‘PRINT THE VALUE

INPUT #1, value$

PRINT “Chlorine concentration is :”, value$

RETURN

Note In PCA300A, PCA300AC, PCA301A and PCA301AC models

the RS232 terminal is not used / not connected.

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Hanna-instruments PCA 300 Series Manual do Utilizador Página 55