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Header on Lenovo M55 motherboard for second RS-232 port (COM2) 11 pins (+1 missing)

As seen from above on motherboard:

    -------------------
    |  |09|07|05|03|01|
    -------------------
    |12|10|08|06|04|02|
    -------------------
Pin
Number
Pin
Name

Pin Number

Pin Name
1 DCD2 2 DSR2
3 RXD2 4 RTS2
5 TXD2 6 CTS2
7 DTR2 8 RI2
9 Gnd 10 COMM_B_DETECT
11 missing 12 NC

COMM_B_DETECT: Connect to GND pin 9 with 1kOhm resistor to enable COM2 in BIOS

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