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--- serial_port_modification [2011/08/13 19:45] – ggrandou
+++ serial_port_modification [2011/08/13 19:56] – ggrandou
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 ===== Introduction =====
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+A standard CA42 Nokia cable.Well, almost "standard".There are two type of serial data Nokia Cables:- the CA42 cable, whose internal transceiver is powered up by the USB port- the DKU5 cable, whose internal transceiver is powered by the phone.My CA42 cable, with all Nokia brands, on the cable, on the package, on the doc, appears to be powered by the phone. This means I will have to solder an additional power line wire.
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+Cut the useless phone connector.Using an ohmmeter, we can identify wires, knowing the Nokia pinout.On this cable:pin 4 - red - 3.3V (used to power the serial-usb transceiver)pin 6 - blue - phone RXpin 7 - white - phone TXpin 8 - black - GNDPinout can be found on this page:http://buffalo.nas-central.org/wiki/Use_a_Nokia_Serial_Cable_on_an_ARM9_Linkstation
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+Dismantled AC100
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+The serial port is the JP1 connector, near the left speaker connector.Pinout, from right to left:1 - in - RX2 - out - TX3 - out - T20_WAKE#4 - out - +3V5 - out - +1.8V678 - in - SYSTEM_RESET#9 - in - EC_TX80_PDATA10 - in - GND
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+st try.black - GNDred - +3.3V, to power up the "Nokia" cablewhite - TX lineYes, there is no RX. While soldering it, I've broken the copper track on the PCB :(As the track is directly connected to the Tegra2 SOC, there is no point where I could solder a wire somewhere else...Hopefully, it the RX line. So, the CPU can still print debug info on the port, I just cannot send chars to the CPU... Half-Fail.
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+Now, let's do things cleanly.a small 4 pin connector (thank you Fifi!). Cable is passed through the Kensington lock hole, so that I don't have to do any mechanical degradation to the AC100 cover.Cable is tied to the AC100 using a hot glue gun. I have used very thin wrapping wires for two reasons:a) the JP1 connector is really small, smaller than the cableb) and my cable was too short anyway!Some adhesive is used to isolate wires from the conductive paint and from the keyboard once it will be put back.
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+Serial port is plugged. let's boot... it works ;)
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+===== misc =====
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