EADAPT Encoder Signal Converter

EADAPT Features

  • Single-ended or differential encoder inputs
  • Encoder rotation sense reversal
  • Index gating and polarity adjustments
  • DIP switch programming
  • Single 5V supply

See more info below

Configure the EADAPT

The EADAPT is no longer available for purchase.

EADAPT Product Description

The EADAPT is an inline encoder signal converter which allows the user to invert or not-invert any of the A,B and Index encoder signals. This can be used to invert the encoder's rotation sense. The input quadrature signals can be single-ended or differential. Single-ended inputs can have amplitudes up to 30V. In addition, the index can be optionally gated by both the A/B channels going low to get an index pulse that is at most one quadrature state wide. This feature is useful when using encoders with a wide index pulse that spans multiple quadrature states.

Encoder input signals enter through a 10-position pluggable screw terminal block. Single-ended encoders should be placed close (less than 2' preferably) to the EADAPT on the input side to limit noise. The EADAPT output is made through a 10-pin latching connector compatible with US Digital encoder interface products. The +5VDC supply voltage for the EADAPT is supplied from the J2 output connector. Three LEDs indicate when the associated A, B or Index ouputs are high.

Product Specifications

View here or download the specifications

Operating Conditions

Supply Voltage 4.75 5.0 5.25 V
Supply Current (no output load, LEDs off)   30   mA
Storage Temperature -40   100 C
Operating Temperature 0   70 C
Humidity (non-condensing) 0   95 %

  • For typical input voltage thresholds and output voltage levels, refer to the 26C31 and 26C32 IC datasheets.

DIP Switch Settings

1 A channel polarity:
switch down = non-invert
switch up = invert
2 B channel polarity:
switch down = non-invert
switch up = invert
3 Index channel polarity:
switch down = non-invert
switch up = invert
4  no function


J1 Input (Screw Terminal):

1 +5V power (direct connection to J2 pins 7,8)
2 A+ channel
3 A- channel
4 B+ channel
5 B- channel
6 Index+
7 Index-
8 Ground
9 N/C
10 N/C

J2 Output (10-pin latching):

1 Ground
2 Ground
3 Index-
4 Index+
5 A- channel
6 A+ channel
7 +5V power
8 +5V power
9 B- channel
10 B+ channel

Product Change Notifications

Title Date Description Download
PCN 1011 9/21/2011 The AD2B, AD4B, AD7, EADAPT, EDAC2, EDIVIDE, EPOT, EQUAD, ESUM, ESWITCH, ETACH2, SEI-USB, USB-232 currently utilizes a printed thermal transfer label. This label will no longer be used and will be replaced by laser marking directly onto the housing of the product. The purpose for this change is to create a more durable solution, and eliminate the possibility of the label being inadvertently removed from the housing. Download

Additional Information

Product Notes

  • Cables and connectors are not included and must be ordered separately.
  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Downloads Available


3D Model Downloads

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    Product Configurator

    This product is no longer configurable or available for new applications.


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