Motherboard connectors pinouts
RS232 serial is also called COM port

RS-232 (also called serial, COM port)  is  still  common interface and most PC are still equiped with serial interface  connector. Usually it is hidden and available as internal header connector only.

There is 2 flavor of header (ex: Motherboard header) (AT/EVEREX) or (DTK/EVEREX) witch match the IDC10.
You need an according port ( with the accordingly cable layout) to the flavor of header you have!
Example: If ou want to have a DB9 put on a 10pinIDC you HAVE TO put an RS-232 Port with pitch header (DTK/INTEL) or with pitch header (AT/Everex) depending of the flavour of the pinout layer!

RS232 Motherboard header pinout ( AT/EVEREX )

IDC internal
 (newer)
AT/EVEREX
Signal Name
 
Description




 
PS RS232 DE-9
pin number


 
1 DCD Data Carrier Detect 1
2 RXD Receive Data 2
3 TXD Transmit Data 3
4 DTR Data Terminal Ready 4
5 GND System Ground 5
6 DSR Data Set Ready 6
7 RTS Request to Send 7
8 CTS Clear to Send 8
9 RI Ring Indicator 9

RS232 Motherboard header pinout (  DTK/INTEL )

IDC internal
(older)
 

Signal Name Description




 
PS RS232 DE-9
pin number


 
1 DCD Data Carrier Detect 1
2 DSR Data Set Ready 6
3 RXD Receive Data 2
4 RTS Request to Send 7
5 TXD
 
Transmit Data 3
6 CTS
 
Clear to Send 8
7 DTR
 
Data Terminal Ready 4
8 RI
 
Ring Indicator 9
9 GND
 
System Ground 5

Pin 10 removed in connector. Internal IDC connnector wired to external port with a simple flat ribbon cable.

PC serial port pinout signals

Since PC serial port is based on RS-232 standard, you may find signal details in the RS-232 interface pinout document

10 pin IDC female connector layout
10 pin IDC female connector
at the cable
10 pin IDC male connector layout
10 pin IDC male connector
at the motherboard
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RS232 serial motherboard header connector visual pinout:
RS232 serial motherboard header connector diagram
click to enlarge
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