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14 pin IDC male connector layout
14 pin IDC male connector
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.

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Dell Optiplex Internal Serial Port visual pinout:click to enlarge
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