I had trouble finding the pinout of the powermax pro (without buying any cable), so with the help of a multimeter and a usb to 3.3V serial TTL adapter (such as this one cgi.ebay.fr/2pcs-USB-2-0-to-TTL-UART-6P ... 3a6f4cc144 but others from arduino/spakfun/adafruit will work) I found these information
I can confirm the pinout because I manage to link a PC using http://realterm.sourceforge.net/ and such a cable I manually calculated a checksum and manage to do the enrolement process.
for the posterity, please find attached two picture of the serial port, with your protocol the serial pinout and a small router such as this one TP-Link TL-WR703N
http://wiki.openwrt.org/toh/tp-link/tl-wr703n you can easily recreate yourself a free (not as in beer) powerlink.
By the way hello to all of domoticaforum user and a big thanks to Rene for describing the protocol
for those too lazy for registering to view the pictures, the port is a 10pin header labeled PC /IP the pinout is described below :
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|?0V GND TX RX 3.75V |
|?0V ?3V ?0V GND 3.75V |
PC / IP