Motherboard connectors pinouts  > Dell pinouts
Dell Optiplex Internal Serial Port-3.3V Signaling

 

Pin
Number

Pin Name

Description
1 In Input(DCD?)
2 Vcc +5VDC
3 In Input(DSR?)
4 Vdd +12VDC
5 In Rx Data
6 N/C No Connect
7 Out Output(RTS?)
8 Vss -12VDC
9 Out Tx Data
10 In Detect
11 In Input(CTS?)
12 Gnd Ground
13 Out Output(DTR?)
14 In Input(RI?)

Detect(pin 10) must be grounded for BIOS to enable port.

Data Signals are 3.3V.

14 pin IDC male connector layout
14 pin IDC male connector
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Dell Optiplex Internal Serial Port visual pinout:
Dell Optiplex Internal Serial Port diagram
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