Normally you should be able to manage the dockstar over the ethernet, but what if you can't establish no connection because you did something wrong? There is a serial connector inside the device we can use for debugging and other things.
1. Required: USB to TTL bridge
Some weeks ago I ordered an USB to TTL UART bridge on eBay, just to have it if I will need it. You also can buy it on amazon: USB2.0 an TTL UART 6pin Konverter seriell CP2102 ID9372 PAUB022
Here are some technical specifications of the one I bought:
All handshaking and modem interface signals Data formats supported: 8-bit; 1 Stop bit Parity: Odd, Even, No Parity Baud rates: 300 bps to 921.6 kbps 512 byte receive buffer; 512 byte transmit buffer Hardware X-On/X-Off handshaking Event character support 6 Pins: 3.3V, RST, TxD, RxD, GND, 5V