2 Channel Digital I/O 1-Wire Card

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Product No.: 72284
The D2PC, 2 channel digital I/O expansion card, provides two I/O channels which can individually be configured as a digital input with latch or a high current sink digital output. Digital input and output functions can coexist.

The D2PC has a built-in multidrop controller (DS2406) which provides a unique 64 bit registration number (8-bit family code + 48 bit serial number + 8 bit CRC) assuring error-free selection and absolute identity; no two parts are alike. Unique addressing allows I/O function to be identified absolutely, no more dip switch address confusion. Status input, latched-input-activity and output-latch functions allow input, output and fast event catch functionality to hundreds of I/O points on a 1-Wire bus. The DS2406 provides the digital I/O functions. The I/O connector is marked "A" I/O position one, "G" common ground returns, "B" I/O position two.

The D2PC is designed to allow a network of input and output modules to operate on a two or three wire bus, power("+"), common("G") and data("D"). The D2PC can be powered locally or the power may be bussed with the 1-Wire signal in a three wire system. The bussed power must be regulated 5V.

The D2PC is compatible with any 1-Wire host with support for the Dallas Semiconductor DS2406 Dual Addressable Switch.


  • D2 - no connector or pull-up resistor
  • D2C - screw connector
  • D2P - onboard pull-up resistor
  • D2PC - screw connector and onboard pull-up resistor


  • 2 channels each configurable as either digital input, or digital output
  • Onboard supply and pull-up resistors
  • Direction connection to switches
  • All data transfers are CRC16 error checked
  • Digital outputs, (A) sink 50 mA, (B) sink 8 mA
  • Digital inputs are latched until read
  • Built-in multidrop controllers, (DS2406)
  • CAT-5 twisted pair up to 1000 Feet, 100 devices
  • Uses 1-Wire communication protocol

Supply Voltage4.5 - 5.5 Volts
Supply Current3 - 8 mA
Output Sink Current (Pos A1)50 mA (see DS2406)
Output Sink Current (Pos B2)8 mA (see DS2406)
Switch Excitation VoltageYes
Operating Temperature-40°C to +85°C
1-Wire ConnectionPhoenix Screw-Down
Family Code0x12
High Level HA7Net SupportYes
Unique IDYes
Memory1024 Bits
Memory TypeEPROM
Dimensions (LxWxH)22x16x14 mm

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