Product manual

Appendix C. HC2S3 Digital Communications
C.4 RS-485 Communications using an SDM-SIO1
Serial I/O Module
The HC2S3 can be interfaced to a CSI datalogger through an SDM-SIO1
Serial I/O Module using the Rotronic E2-05XX-MOD RS485 cable as
described below.
The example program uses the SerialOpen instruction to configure the SDM-
SIO1 for RS-485 half duplex, “COMport 32” at 19200 baud, no parity, 1 stop
bit, and 8 data bits, and serial instructions to send the RDD command to get
temperature and relative humidity data from the probe.
Sensor Wiring:
E2-05XX-MOD Cable SDM-SIO1 CR1000
Blue Z
Red Y
Gray/Yellow G
Green 12V
Clear Ground
SDM-SIO1 Wiring:
SDM-SIO1 CR1000
C1 C1
C2 C2
C3 C3
G G
12V 12V
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
Example CR1000 Program:
'CR1000 Program
'Declare variables
Public TempC, RH, NBytesReturned
Public SerialIndest As String * 100
Dim String_1 As String
Const CRLF=CHR(13)+CHR(10)
Const SensorPort=32 'SDM-SIO1 rotary switch set at 0
DataTable (Table1,1,-1)
DataInterval (0,15,Min,10)
Average (1,TempC,FP2,False)
Sample (1,RH,FP2)
EndTable
C-5