Home of the ICON - Instrumentation and Control Over Networks Last updated April 1, 2007

     ICONIO Board
     1-Wire I/O Devices

     ICONIO Card Installation
     ICONIO Programming

     Basic 1-Wire Installation

     2 Chan Counter (OWCTR2)

     2 Chan A-D (OWAD2)

     4 Chan A-D (OWAD4)

     1 Chan Pot Out (OWPOT1)

     Dry Contact (OWRELAY4)

     Connections (OWCONNECT)

     Temperature (OWT)

     Relative Humidty (OWTRH)

     Light (OWL)

     Weather Station (OWWEATHER) 


     Phone: (406) 599-1053

1 Channel Potentiometer Out (OWPOT1)


This 1-wire card uses the DS2890 IC which has one programmable linear taper potentiometer which supports voltages up to 11 volts. You may use this module to generate output (D-A) control voltages.

Card Type: 129

Connector CN2 (5-pin style) Pinout
Pin Numbers Description
1 Common
2 Potentiometer Common (Must connect pin 2 to pin 1)
3 Potentiometer wiper
4 Potentiometer High (can connect pin 4 to pin 5 or connect to any voltage up to 11 V with respect to Common) 
5 +5V Power Output

Connector CN2 (6-pin style) Pinout:
Pin Numbers Description
1 Common
2 No Connection
3 Potentiometer High (can connect pin 3 to pin 6 or connect to any voltage up to 11 V with respect to Common)
4 Potentiometer wiper
5 Potentiometer Common (Must connect pin 5 to pin 1)
6 +5V Power Output


The "Type" must be 129 as described above. The "Mode" must always be "Separate power".

Modbus Register Information:

This device has one Modbus output register on the ICONIO board used to set the potentiometer wiper position. The register value range is 0 to 255.

Parameter Specification
Temperature -40 to +85C (-40 to +185F)
Potentiometer Low Must be tied to Common
Potentiometer High Up to 11V with respect to Common. Can also connect to +5V power output.
Register Range 0 to 255 (Sets the wiper in 256 steps)
Resistance Value 100K ohms
Resistance Tolerance +/-25%

Schematic and Parts List:
Reference Part Number
CN1 Digikey 281-1451-ND
CN2 Digikey 281-1452-ND
D1 Dallas Semi DS9503P
D2, D4 Digikey SA5V0ADICT-ND
U1 Dallas Semi DS2890P-000

Copyright © 1998-2007