FYI- You do not need to buy the Metra USB-CAB overpriced cable, you can pick up a USB TTL serial converter off ebay for about $3 to $6 shipped: This is the correct USB to TTL cable needed. It is less than $3 on ebay. http://cgi.ebay.com/ws/eBayISAPI.dll...m=130683943875
- or - just search for "USB to TTL 5v"
** Just make sure the converter you buy supports 5v output on the TTL pin side, the ASWC needs 5v from the TTL cable pins.
The $3 ebay adapter referenced above has the TTL pins marked on the board so you'll know which pin is which.
Hooking up the adapter wires to the ASWC:
In studying close up shots of the USB CAB cable, and the port opening on the ASWC, the cable is "keyed" so it only fits one way (so you cannot put it in backwards). Given this, refer to the image for layout and pin assignments. Using this, you can use any inexpensive USB to TTL 5v adapter as long as it supports 5v output on the TTL pin side.
(please excuse my low-tech photoshopping..)
Pin Out of USB-CAB Cable, Wire Colour, Function on the ASWC PINs:
Pin #1 is the leftmost pin when holding the AWSC in front of you, the firmware update access port should be on your lower left corner on face of ASWC unit. The pins run horizontally left to right, I am numbering them 1-4. It is OK if your cables are not the same colors as below, the colors noted below are on the Metra USB-CAB cable.
1 : : Ground (Black from USB-CAB cable)
2 : : TTL Receive Rx (Yellow from USB-CAB cable)
3 : : TTL Transmit Tx (Orange from USB-CAB cable)
4 : : Vcc +5V typical (Red from USB-CAB cable)
Metra should be *ashamed*
of themselves for the outrageous price of their "special" cable, which is nothing more than a standard USB-TTL converter used for programming phones and other devices. It probably cost them 50 cents to make (at most). I would pay an extra $5 for the ASWC if they just included the darn cable.