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


The first ICONIO board is part of a two card set that also includes the ICON Controller board (Figure 1). This first ICON is referred to as ICON-LOCAL (or just ICON). This first ICONIO card connects to the RS232 serial port COM2 on the controller board through CN7. The ICONIO card converts this RS232 level to 2-wire RS485 for transmission through connector CN6.
Pin CN6 (Modbus RS485 interface)
1 RS485 B
2 RS485 A
3 Common

You may use a Cat 5 cable to connect a second ICONIO to the first by interconnecting their CN6 connectors (Figure 2). All additional ICONIOs are referred to as ICON-REMOTEs. You may daisy chain from the second ICON-REMOTE's CN6 connector to a third ICON-REMOTE. You may continue on and daisy chain to as many as 31 additional ICON-REMOTE boards. The maximum distance from the ICON-LOCAL to the last ICON-REMOTE is 4000 feet.

Switch configuration (SW1) for ICONIO-LOCAL (Note: the Modbus address is 255):

ICONIO Switch Number (SW1) Function
1 Off for Normal Operation
2 Off for Normal Operation
3 Off can program ICON; On ICON can't be re-programmed
4 Off for normal operation
5 Unused
6 Unused
7 Unused
8 Unused
9 Off-9600; On 19200 for Modbus Baud Rate
10 Off ICON-REMOTE (Switches 1-8 select Modbus address); On ICON-LOCAL

The ICONIO board "looks" like a Modbus device to your ICON program running on the ICON controller.  Each Modbus node must have a unique unit address in the range of 1 to 255. The first ICONIO-LOCAL is always given address 255. If you add additional ICONIO-REMOTE boards you may use the dip switches (SW1) to assign other addresses. Each separate ICONIO must have a unique address and it is easiest to assign them in order, 1, 2, 3 etc. For ICONIO-REMOTE, switches 9 and 10 function as described above. Switches 1 to 8 select the Modbus slave address as follows:

Modbus Slave Address 1 2 3 4 5 6 7 8
1 On Off Off Off Off Off Off Off
2 Off On Off Off Off Off Off Off
3 On On Off Off Off Off Off Off
4 Off Off On Off Off Off Off Off
5 On Off On Off Off Off Off Off
6 Off On On Off Off Off Off Off
7 On On On Off Off Off Off Off
8 Off Off Off On Off Off Off Off
9 On Off Off On Off Off Off Off
10 Off On Off On Off Off Off Off
11 Etc. - - - - - - - -

Make sure the Jumpers are set as follows on an ICON-LOCAL:
Jumper (JP) Number State
JP1 Out
JP2 In
JP3 In
JP4 Out
JP5 In

Make sure the Jumpers are set as follows on an ICON-REMOTE:
Jumper (JP) Number State
JP1 In
JP2 Out
JP3 Out
JP4 In
JP5 Out

Each ICONIO board receives its power through CN1 as decribed below:
CN1 Connection Number Description
1 Earth ground, should be connected to an appropriate ground rod for maximum ESD and lightning protection.
2 Power Common (Center tap of AC power transformer if a center tap transformer is used).
3 9-24 VAC or VDC unregulated power input (Works great from 12V DC battery and solar panel).
4 9-24 VAC if using a center tap transformer.
5 Power Common.
6 Rectified AC input.

Notice power may be low voltage AC or DC in the range of 9 to 24 volts. If using an AC source you may use a center tapped transformer or a non-center tapped transformer. No voltage on connections 3 or 4 should exceed 35V peak with respect to power common. Earth ground and power common are connected together on the local ICONIO. However, it is not the same on ICONIO remote units. For remote ICONIO units you must still connect 1 to a ground rod. The power supply for power inputs 2-4 must be floating with respect to 1.

Connections 5 and 6 provide you with a way to supply unregulated DC power to external devices such as relay coils. This output is protected with a 3 amp resettable fuse. (Note, on older ICONIO boards, connections 5 and 6 do not exist.)

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