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Appendix C. Interfacing with HMP155A RS-485 Output

‘CR1000 Series Datalogger

‘Sensor Wiring:

‘HMP155A with RS-485 Output:

‘

‘ HMP155A HMP155A SDM-SIO1 CR1000 Connector Pin-Out

‘ CSI Vaisala

‘ *Cable Cable

‘ blue pink Y 6

‘ yellow brown Z 2

‘ black red G 8

‘ red blue 12V 7

‘ white green 0V 3

‘ shield (clear) black Ground not connected

‘ grey, pink, brown – NOT used

‘ *HMP155ACBL2 cable, ordered separately

‘Declare Public Variables

Public TempC, RH, NbytesReturned

Public SerialIndest As String * 26

Public String_1 As String

Public String_2 As String

Const SensorPort=32

Const CRLF=CHR(13)+CHR(10)

SequentialMode

‘Define Data Tables

DataTable (Table1,1,-1)

DataInterval (0,15,Min,10)

Average (1,TempC,FP2,False)

Sample (1,RH,FP2)

EndTable

‘Main Program (for sensor configured for default settings of 4800 baud, E,7,1)

BeginProg

SerialOpen (SensorPort,4800,58,0,53) ‘ buffer = 2*number of bytes + 1

‘ SDM-SI01 port 58 for half duplex,7,E,1

‘Strings to start serial output

String_1 = “SMODE RUN”+CRLF ‘ set SMODE to “RUN”

String_2 = “R”+CRLF ‘ send “R” to start serial output

‘Instructions to enable RS-485 serial output

SerialOut (SensorPort,String_1,”RUN”,3,100) ‘send String_1, wait for ‘RUN’ response

Delay (0,500,mSec)

SerialOut (SensorPort,String_2,”RH”,3,100) ‘send String_2

Scan (5,Sec,0,0)

‘Get serial string from sensor

SerialInRecord (SensorPort,SerialIndest,00,24,&H0D0A,NbytesReturned,00) ‘&H0D0A = CRLF

‘Parse RH and temp from string

RH=Mid (SerialIndest,5,4)

SplitStr (RHArray(1),SerialIndest,”=”,2,0)

CallTable Table1

NextScan

EndProg

C-2

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