Campbell AVW1 Specifikace stáhnout pdf (Strana 22)

AM16/32B Relay Analog Multiplexer

‘Main Program

BeginProg

Scan (5,Sec,0,0) ‘scan instructions every 5 sec

Battery (Batt_volt)

PanelTemp (Panel_temp,250)

‘

‘Set flag 1 High every 30 min (Note: User can manually set flag 1 high/low)

If IfTime (0,30,min)Then flag (1)=high ‘++++++++++++++++++++++++

If Flag(1)=high Then

‘measure 48ea CS616 probes on AM16/32B in (4x16) mode

PortSet (4,1) ‘Set Mux Reset line High

‘

I=1 ‘set sub scan loop counter

SubScan (0,mSec,16)

PulsePort (5,10000) ‘Clock Mux

CS616 (Period(I),3,1,6,3,1.0,0) ‘measure 3ea CS616 probes

I=I+3

NextSubScan

‘

For I=1 to 48 ‘convert CS616 period to Volumetric Water Content

VWC(I)=a0 + a1*Period(I) + a2*Period(I)^2

‘

PortSet (4,0) ‘Set Mux Reset line Low

flag(1)= low

EndIf ‘+++++++++++++++++++++++++++

‘

CallTable Dat30min ‘Call Output Tables

NextScan

EndProg

5.1.2 CR5000 and CR3000 Programming

Although the following example is a CR5000 program, a similar program can

be used for the CR3000. This CR5000 program uses the AM16/32B to

measure 16 100 ohm Platinum Resistance Thermometers connected in the

4x16 configuration. The program also measures 6 copper constantan

thermocouples.

CR5000 AM16/32B PRT(4 Wires)

Control/Common Sensor Terminals

C1 Reset Odd H Excitation

C2 Clock Odd L Excitation Return

IX1 COM Odd H Even H Sense wire excitation side

IXR COM Odd L Even L Sense wire return side

7H COM Even H

7L COM Even L

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 49 50

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Campbell AVW1 Specifikace Strana 22

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