Terastation III Serial console
If you want Bi-directional traffic, you need to remove this chip. After that you can get access to u-boot and serial console for login in.
The Chip to remove is IC39 a SN74LVC08 (Quadruple 2-input positive-AND Gates) In the TS is only Gater 2 in connection.
Pin 4 comes from RS232
Pin 5 ?????
Pin 6 go to inside TS
When you remove the Chip IC39 and the Resistor R533 is empty, you mast bridge the solder points from R533
When R533 is not empty, what is the value of R533?