Just finished soldering the wires. Tested on my Win2000 WM. The CH340 was detected, but on the HPC end, connection with PC failed to be established. I suspect it's due to the incompatible chipset or lack of driver.
Sigmarion II serial port pinout
1 = DCD
2 = RTS
3 = RxD
4 = DSR
5 = TxD
6 = CTS
7 = ?
8 = DTR
9 = GND
CH340 pinout
2 = RxD
3 = TxD
5 = GND
Wiring (Sig 2 <-> CH340)
Pin 3 (RxD) <-> Pin 3 (TxD)
Pin 5 (TxD) <-> Pin 2 (RxD)
Pin 9 (GND) <-> Pin 5 (GND)
Another question: Are RTS and CTS necessary after all? It seems CH340 does not use these pins in my simplified version.
Or should I buy another serial to usb adapter using the more common PL2303 chipset, which was used in numerous Sig2 cable mods in the past?
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