Appendix C. HC2S3 Digital Communications
Sensor Wiring:
E2-05XX-MOD
Cable
MD485
CR1000
Blue
A
Red
B
Green
12V
Gray/Yellow
G
Clear
Ground Symbol
If the Rotronic cable includes brown and white wires (voltage
signals for temperature and humidity), CSI recommends
“capping” them with PN 27749 or equivalent insulated caps to
prevent the possibility of shorting.
NOTE
Connect the CS I/O port of MD485 to CS I/O port on CR1000 with an SC12
cable.
The following example CR1000 program configures the CS I/O port as
COMSDC7 using the SerialOpen instruction, sends the RDD (Read Values)
command “|{F00RDD}CR” to the probe, and parses temperature and relative
humidity values from the data string returned by the probe.
Example CR1000 Program:
'CR1000 Program
'Declare variables
Public SerialIndest As String * 100
Dim String_1 As String
Const CRLF=CHR(13)+CHR(10)
Dim HC2S3_Split(17) As String * 40
Alias HC2S3_Split(2) = RH_Str
'RH string.
Alias HC2S3_Split(6) = TempC_Str
'Temp string.
Alias HC2S3_Split(17) = HC2S3_SN_Str
'HC2S3 serial number string.
Public TempC, RH, NBytesReturned
DataTable (Table1,1,-1)
DataInterval (0,15,Min,10)
Average (1,TempC,FP2,False)
Sample (1,RH,FP2)
EndTable
BeginProg
SerialOpen (ComSDC7,19200,0,0,100)
'Configure CS I/O port
String_1 = "|{F00RDD}"+CRLF
'RS485 command to send data
Scan (5,Sec,0,0)
SerialFlush (34)
SerialOut (ComSDC7,String_1,0,2,100)
'Send command to send data
Delay (0,500,mSec)
'Get data from probe
SerialInRecord (ComSDC7,SerialIndest,&H6464,0,&H3B48,NBytesReturned,01)
'Parse RH and temp from string
SplitStr (HC2S3_Split(),SerialIndest,";",17,7)
RH=RH_Str
TempC=TempC_Str
CallTable Table1
NextScan
EndProg
C-4
