Last updated:  April 22, 2003

Description:

This 1-wire card uses the DS2450 IC in the output mode to turn four digital signals on and off. The output is buffered with an open collector 7407 IC that can be used to control DC relay coils at up to 35V at 24 mA each. It can also be connected to the RELAY4B. This board accepts four optically isolated solid state relays. These can be any combination of an OAC5A (switches 24 to 240VAC at up to 3 amps) or an ODC5A (switches 4 to 200VDC at up to 1 amp).

Card Type: 128

Connector CN2 (6-pin style) Pinout:

Pin Numbers	Description
1	Common or Ground
2	Output channel 4
3	Output channel 3
4	Output channel 2
5	Output channel 1
6	+5V Power Output

OWconfig:

The "Type" must be 128 as described above. The "Mode" must always be "Separate power".

Modbus Register Information:

This device has four consecutive Modbus output registers on the ICONIO board, one for each digital output channel. Writing a 0 to an output register turns the relay off. Writing a 1 turns the relay on.

Specifications:

Parameter	Specification
Temperature	-40 to +85C (-40 to +185F)
Configuration	Open collector NPN transistor per channel
Coil Voltage	up to 35VDC
Sink Current	up to 24 mA per channel

Schematic and Parts List:
 

Reference	Part Number
CN1	Digikey 281-1451-ND
CN2	Digikey 281-1452-ND
D1	Dallas Semi DS9503P
D2	Digikey SA5V0ADICT-ND
U1	Dallas Semi DS2450S
U2	Digikey DM7407N-ND