Electronic – connect vcc to vdd

powervoltage

I have an USB-UART cable. The connectors listed are Red VCC, Black GND, Green TXD, White cable RXD.

I want to connect it to a Alfa Hornet-UB board (http://www.youtube.com/watch?v=i58XOF4Rfc4) with pins for GND, TX, RX, VDD. If I connect:

Black (GND) - GND
Green (TXD) - TX
White (RXD) - RX
Red (VCC) - VDD

Will this damage the board?

I want to be cautious because I have previously connected a 3v to the VDD pin, which broke the board.

I assume TX is the same as TXD (Transmit), and RX = RXD?

Best Answer

Based on the images used on the manufacturer's page, found two sites WifiPineapple Wiki (very detailed) and Opening The Alfa AP121U (AP121U is the commercial product version of the Hornet-UB board) that use the same image and reference the same board. Both state DO NOT CONNECT THE VDD PIN. So that's the main source of your problems. The WifiPineapple Wiki mentions that any 3.3v uart adaptor will work.

This board is based on the AR9331, an Atheros SoC. Atheros never releases datasheets for the chips, but they have been reversed engineered by OpenWRT users, and these chips are known to use 3.3v.

Oh, and importantly, you want to crossover the uart cable. The Uart Cable TX would connect to the board's RX, and Uart Cable RX connects to the board's TX.

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