Connecting the micro-controller board to your DB25 input motor driver board:

Most users will already have one or more motor driver boards having a DB25 male input connector and use two pins, i.e., direction and step, to control each motor. Most boards will be compatible with the low voltage, i.e., 3.3 volt, processor outputs although some may require 5 volt signal level conversion.

A suggested method to connect the processor board to you current motor driver board is as follows:

1)     Order a DB25 Female to DB25 Female cable from:

                DB25 Female/Female Extension Cable - 10 FT |

2)     Cut the cable in half. This will give your two cables.

3)     Strip the cable sheath back 4 inches to give you generous length for the signal wires.

4)     Cut the braided shield back 3 inches and unravel,

5)     Using a wire wrap tool, available from Radio Shack, strip the signal wire insulation back about 3/4 inch and twist the strands together.

6)     The cable will probably use the color code chart provide below. You should check that it does using a continuity tester.

7)     Use a small nylon cable tie to anchor the parallel cable to one of the three mounting holes.

8)     Assign pins for the motor axes and other outputs in the host application.

9)     Here you have a choice of either wire wrap connections or solder connections.

Wire wrap:

9a)     The EK-TM4C1294XL Connected Launchpad has seven ground solder pad holes on the side breadboard area. Solder 0.025” square wire wrap pins to a few or all of the ground pads.

9b)     Make a solder ground connection for the cable shield to a pair of adjacent ground pins.

9c)     Use the wire wrap tool to twist the wire ends to the BoosterPack 0.025” square posts corresponding to the assigned GPIO outputs.

9d)     Ground at least one unassigned DB25 high numbered pin.


9e)     The EK-TM4C1294XL Connected Launchpad has seven ground solder pad holes on the side breadboard area.

9f)     Solder 0.025” square wire wrap pins to a pair of adjacent ground pads. Solder the cable shield to these pins.

9g)     Solder the parallel wire ends to the corresponding breadboard signal pad.

Parallel Cable Color Coding

1     Black

2     Brown

3     Red

4     Orange

5     Yellow

6     Dark Green

7     Blue

8     Violet

9     Grey

10   White

11    Pink

12    Light Green

13    Black        with White stripe

14    Brown      with White stripe

15    Red           with White stripe

16    Orange     with White stripe

17    Green       with White stripe

18    Blue          with White stripe

19    Violet       with White stripe

20    Red          with Black stripe

21    Orange     with Black stripe

22    Yellow     with Black stripe

23    Green      with Black stripe

24    Grey        with Black stripe

25    Pink         with Black stripe

Shield    Bare wire

Parallel Cable Wiring