Qnap Turbostation:TSSerial

Serial Port Connections
This page details ways to connect to the serial port on the QNAP Turbostation series of devices. Both the [Qnap_Turbostation:TS101 TS101] and [Qnap_Turbostation:TS201 TS201] have a 2x3 pin connector located behind LED 1 on the HDD side of the board. The pin outs are shown on the figure and labelled below

NOTE: This is a 3.3V TTL 232 communication protocol - you should level shift the cable so that a PC can see 5V TTL. There are a variety of ways to do this - most are documented at the nslu2-linux website. Use a Serial Console and Adding a serial port.

The easiest method is to purchase a FTDI TTL-232R-3V3 cable (e.g. here, or through international distributors). This enables a host machine to connect to the turbostation via a USB connection and interact directly with the U-Boot Bootloader. You could however use a level shifter (e.g. Maxim 3232) to enable the serial port to power other RS232 based devices.