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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
3.5mm TRRS (4 pin) male to DB9 female


Device 1
Pin Number
Device 1
Pin Name
Direction Device 2
Pin Number
Device 2
Pin Name
1      2 RxD   
2      7 RTS   
3      3 TxD   
4      5 GND   



This pinout also matches the "Amiko alien mini" satellite settopbox serial port. RTS is unused / grounded there.

9 pin D-SUB female connector layout
9 pin D-SUB female connector
According to 7 reports in our database (7 positive and 0 negative) the ATEN CS1644, CS1744 Firmware Upgrade Cable pinout should be correct.

Is this pinout
ATEN CS1644, CS1744 Firmware Upgrade Cable visual pinout:click to enlarge
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