# apu02 Cables

To connect the Moxa with my apus I had to customize the cables I got from [aliexpress](https://www.aliexpress.com/item/32945212998.html?spm=a2g0s.9042311.0.0.10a84c4dRNyK7K).

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.
[![Breadboard in the middle](https://naumann.dev/uploads/images/gallery/2020-03/scaled-1680-/IMG_20200315_155533.jpg)](https://naumann.dev/uploads/images/gallery/2020-03/IMG_20200315_155533.jpg)
To connect the wires to the breadboard I did crimp connectors to them.
[![Crimped male connectors](https://naumann.dev/uploads/images/gallery/2020-03/scaled-1680-/IMG_20200315_160545.jpg)](https://naumann.dev/uploads/images/gallery/2020-03/IMG_20200315_160545.jpg)
For this I used a crimping tool and a set of connectors.
[![Crimping tool](https://naumann.dev/uploads/images/gallery/2020-03/scaled-1680-/IMG_20200315_063259.jpg)](https://naumann.dev/uploads/images/gallery/2020-03/IMG_20200315_063259.jpg)
Then the fun started, based on the information from [pcengines](https://www.pcengines.ch/db9cab1.htm) and from the [Moxa CN2510 Manual](https://www.moxa.com/en/products/industrial-edge-connectivity/serial-device-servers/terminal-servers/cn2510-series#resources) about the expected wiring I tried to apply it to the existing cable. 
##### Check the cable
I checked the wiring using a Fluke 115.
[![Fluke 115](https://naumann.dev/uploads/images/gallery/2020-03/scaled-1680-/IMG_20200315_063222.jpg)](https://naumann.dev/uploads/images/gallery/2020-03/IMG_20200315_063222.jpg)
##### 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:
[![color](https://naumann.dev/uploads/images/gallery/2020-03/scaled-1680-/color_turn.jpg)](https://naumann.dev/uploads/images/gallery/2020-03/color_turn.jpg)

| 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.
[![Crimp tool](https://naumann.dev/uploads/images/gallery/2020-03/scaled-1680-/IMG_20200315_063138.jpg)](https://naumann.dev/uploads/images/gallery/2020-03/IMG_20200315_063138.jpg)
And the custom cable got produced.
[![Cable](https://naumann.dev/uploads/images/gallery/2020-03/scaled-1680-/IMG_20200315_105201.jpg)](https://naumann.dev/uploads/images/gallery/2020-03/IMG_20200315_105201.jpg)