apu02 Cables

To connect the Moxa with my apus I had to customize the cables I got from aliexpress.

Till now I never had to create my custom serial console cable, so to me this was a new experience.

Finding the combination

I first had to find out the correct combination of cables since it did not work with these cables right away so I put a breadboard in between the cables. To connect the wires to the breadboard I did crimp connectors to them. For this I used a crimping tool and a set of connectors. Then the fun started, based on the information from pcengines and from the Moxa CN2510 Manual about the expected wiring I tried to apply it to the existing cable.

Check the cable

I checked the wiring using a Fluke 115.

Pin combinbations

Finally I had the correct wiring transferred to my cable.

For the RJ45 the Moxa needs the following wiring:

Pin Collor Signal Type 1 transparent DSR 2 green RTS 3 white GND 4 orange TxD 5 brown RxD 6 red DCD 7 blue CTS 8 yellow DTR

From the DB9 Connector these colors are assigend to the follwing Pins, the apu expects a wiring of a null modem cable.

Pin Collor Signal Type 1 brown DCD 2 red RxD 3 white TxD 4 green DTR 5 orange GND 6 blue DSR 7 transparent RTS 8 yellow CTS

The mapping

Based on this information I came up with the following mapping:

Pin Collor 1 blue 2 yellow 3 - 4 red 5 white 6 orange 7 transparent 8 green

The the RJ45 crimping tool came to use. And the custom cable got produced.