 The D2, 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 D2 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
DS2407 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 D2 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 D2
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 D2 is compatible with EDS OneSix DDE server and family of 1-Wire enabled
devices, as well as any 1-Wire host with support for the Dallas Semiconductor DS2406
Dual Addressable Switch and EDS Analog.
D2 configurations
- D2 - no connector or pull-up resistor
- D2C - screw connector
- D2P - onboard pull-up resistor
- D2PC - screw connector and onboard pull-up resistor
Features
- 2 channels each configurable as either digital input, or digital output.
- 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, (DS2407).
- CAT-5 twisted pair up to 2000 Feet, 200 devices.
- Uses 1-Wire Communication Protocol.
Specifications
- Supply Voltage: 4.5 - 5.5 Volts
- Supply Current: 3 - 8 mA
- Output Sink Current (A Position 1): 50 (see DS2406) mA
- Output Sink Currnet (B Position 2): 8 (see DS2406) mA
1-Wire is a registered trademark of Dallas Semiconductor Corporation.
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