These internal serial cables are typically used to connect to a motherboard header and provide an external serial (COM:) port on the rear of a PC. A fitting bracket (as shown) is provided.

Please be aware that there are two very common (but incompatible) ways of wiring internal serial cables - straight and crosswired. This is the STRAIGHT version, and is wired as follows...

Ribbon     DB9        
Header     Connector  Function
1 ---------- 1        DCD
2 ---------- 2        RX
3 ---------- 3        TX
4 ---------- 4        DTR
5 ---------- 5        GND

6 ---------- 6        DSR
7 ---------- 7        RTS
8 ---------- 8        CTS
9 ---------- 9        RI

If unsure, please check your motherboard manual for the COM header connection, and ensure that the function of each pin corresponds with the function of each (ribbon header) pin as per the diagram above. If they differ, please check our cross-wired version of this cable for suitability. Information concerning the function of the DB9 connector pins are given in the diagram above for completeness.

Note: Cable length is 50 cms.