Hanna Instruments PCA 300 Series - Manual (Page 55)

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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.