Internal IDC connnector wired to external port with a simple flat ribbon cable. RS232 Motherboard header pinout ( DTK/INTEL ) You need an according port ( with the accordingly cable layout) to the flavor of header you have!Įxample: If you want to have a DE-9 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 These connections can be seen in red below (figure 2 for RS-232 and figure 3 for RS-422/485). There is 2 flavor of header (ex: Motherboard header) (AT/EVEREX) or (DTK/INTEL) witch match the IDC10. Figure 1: Pinout diagram for DE-9 Connector To perform a loopback test with no hardware flow control, you will need to connect pins 2 and 3 for RS-232 and pins 4 to 8 and 5 to 9 for RS-422/485. Usually it is hidden and available as internal header connector only. RS-232 (also called serial, COM port) is still common interface and most PC are still equiped with serial interface connector.
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