Handhelds.org - Open source for handheld devices

UserPreferences

MyPal620SerialCable

MyPal A620 IO connector

Pinout

Pinout of A620 Connector is as follow. 

1:GND
2:TRST
3:TCK
4:TDO
5:TMS
6:TDI
7:GND
8:USB D-
9:USB D+
10:VBUSD
11:USBH-
12:USBH+
13:VUSBH
14:DC4
15:DC3
16:DC2
17:DC1
18:RXD
19:TXD
20:GND
21:V
22:H
23:B
24:G
25:R
26:GND

Compatibility

[Nipo] I bought a connector designed for PocketLoox (Asus design), it is mecanically compatible. Wiring is different. The one I bought was openable, so I re-wired it, It now looks like this: [WWW]Image. (On the photo, I also wired JTAG and USB, so it has too much things for a normal usage).

Photos

Maybe you would like to see some pictures, yet again, the cable on the photos also has USB and JTAG connections, so dont be afraid. [WWW]Photos directory

Wiring

Electrical level of serial port from MyPal is TTL (0-5V). RS232 is somewhat non-compatible. An adapter MUST be used to adapt the different levels. You'll burn the MyPal serial port if you directly connect it to the PC one without this.

One chip designed for it is Max-232 (from Maxim). It also needs power (5V, but hopefully enough, we can draw some current from MyPal) and a few capacitors. You can also use Max-233 (no need for external capacitors, 5V) or Max-3232 (3.3V - 5V, external capacitors needed). All of these are compatible Voltage level RS232 adaptators and should work. I used ADM233-LJ which is compatible too for a DG834G router serial port modification. Links are available on OpenWRT wiki to schematics.

Schematic

I could have done some ASCII-Art schematic, but a simple list is enough.

Shoplist:

Of course, connect all "Gnd"s together.

Err, and as usual, I assume you are able to build up this kind of stuff without bricking you PDA, if ever you do so, I shall not be responsible. But I'm sure you are very good at hacking hardware. ;-)

On RS232 (DB9) connector

2 is Rx, connect to Max's 14
3 is Tx, connect to Max's 13
5 is ground, common (Gnd)

1 floating
4-6 wired together (loopbacking DSR/DTR)
7-8 wired together (loopbacking RTS/CTS)

On Max232

Put capacitors on: 

1-3: (+) on 1
2-16: (+) on 2
4-5: (+) on 4
6-Gnd: (+) on Gnd
And wire those to other parts: 
11-12: to MyPal
13-14: to DB9
15: Gnd, common
16: MyPal VUSBH

On MyPal

7: Gnd, common
13: VUSBH to Max's 16
18: RxD, to Max's 12
19: TxD, to Max's 11