Mini-Crossover
To make a regular straight through ethernet cable into a crossover we will create a mini cable a couple inches long to flip the nessicary wires and add it to the regular cable with the couple. The first thing to do is strip the outer shielding and crimp on the RJ45 plug with the following connections:
SIDE 1
RJ45 Pin1: white-orange
RJ45 Pin2: orange
RJ45 Pin3: white-green
RJ45 Pin4: blue
RJ45 Pin5: white-blue
RJ45 Pin6: green
RJ45 Pin7: white-brown
RJ45 Pin8: brown
SIDE 2
RJ45 Pin1: white-green
RJ45 Pin2: green
RJ45 Pin3: white-orange
RJ45 Pin4: white-brown
RJ45 Pin5: brown
RJ45 Pin6: orange
RJ45 Pin7: blue
RJ45 Pin8: white-blue
Wire the DB9 Plugs
The two DB9 plugs that i found were male and we need female, so we have to convert them. The first thing to do is open the housing, there should be four clips that hold the two halves together. Once inside the case you can remove the guts of the plug and cut off the plug we wont be using. We can then solder these wires into the proper order:
RJ45 Pin1 (blue): DB9 Pin3
RJ45 Pin2 (orange): DB9 Pin5
RJ45 Pin3 (black): DB9 Pin2
RJ45 Pin4 (red): DB9 Pin7
RJ45 Pin5 (green): DB9 Pin4
RJ45 Pin6 (yellow): DB9 Pin5
RJ45 Pin7 (brown): DB9 Pin8
RJ45 Pin8 (white): DB9 Pin1 and DB9 Pin6
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