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Motherboard header on Lenovo M82 for a second serial RS-232 port (COM2) 15 pins (+1 missing)

As seen from above on motherboard:

Pin
Number
Pin
Name

Pin Number

Pin Name
1 +12 2 -12
3 DCD2 4 DSR2
5 RXD2 6 RTS2
7 TXD2 8 CTS2
9 DTR2 10 RI2
11 Gnd 12 COMM_B_DETECT
13 EXT_RI2 14 +5V
15 NC 16 Gnd

COMM_B_DETECT: Connect to GND to enable COM2 in BIOS

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