==================================== testing pins using a tester This is how I determined serial access on the Lacie Network Space There are 8 pins on the board, they are labelled J4. I decided that pin1 is the pin nearest to the screw and farther from the hard disk. Then I followed instructions on http://wiki.openwrt.org/doc/hardware/port.serial#finding.serial.console when the box is off, I decided that pin 2 is ground (since it is the lowest ohm resistance to hard disk metal) when the box is on, connecting the black tester cable to pin 2, I read voltages: pin 1: +5V pin 2: ground pin 7 5 4: 0 pin 6 and 3 : ~2V This is consistent with what is written in http://lacie.nas-central.org/wiki/NetworkSpace:_Serial_Port_Access > I measured the voltage on the pins. I measured 5 volts on the pin near the screw hole, and ground on the next. > So I assume the pinning > > 1 VCC (+5V) > 2 GND > 3 JTAG TMS : input to board > 4 JTAG TCK : input to board > 5 JTAG TDO : output from board > 6 JTAG TDI : input to board > 7 Serial RxD : input to board > 8 Serial TxD : output from board > > is correct, counting from the screw hole. ==================================== note that the above pinning is not a 8-pin JTAG header, that should be > http://hri.sourceforge.net/tools/jtag_faq_org.html#_Toc63218718 > Usual pin-out for 8-pin JTAG header, often used for PLD programming > 1 – vddh (+3.3v) > 2 – TDO [test data out] > 3 – TDI [test data in] > 4 – nTRST [test reset, optional] > 5 > 6 – TMS [test mode select] > 7 – vss (ground) > 8 – TCK [test clock]