卻發現在 BIOS 內只有看到一個 COM 1
經過一番的折騰,才發現原廠的排線是有玄機的
想要買到已停產電腦的選購配件可是難上加難
若要用一般市面的排線來代替就需要弄清楚接腳的規格與如何啟用
在網路上找到此篇解說資料先做個筆記
What is the COM2 header pinout on Dell Optiplex 260 or 270?
Answer:
Pins 1 through 9 on Dell's 12(-1)pin header are numbered identical to a DE-9 serial port, with additional pins 11 & 12 acting as an "enable" or "present" signal to the BIOS for the additional com port. Pin 10 in missing.
Pins 11 & 12 need to be tied together to enable COM2.
Now, when you reboot & enter BIOS Setup, you will find settings options for two(2) comports instead of just one.