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RS232 Data Interface (Serial Cable )

RS-232 is simple, universal, well understood and supported but it has some serious shortcomings as a data interface. The standards to 256kbps or less and line lengths of 15M (50 ft) or less but today we see high speed ports on our home PC running very high speeds and with high quality cable maxim distance has increased greatly. The rule of thumb for the length a data cable depends on speed of the data, quality of the cable

Some of more popular wiring configurations are:

1. Straight-Thru (i.e. 1-1, 2-2, 3-3, 4-4, etc.)
2. Null Modem, DB25 ( 1-1, 2-3, 3-2, 4-5, 5-4, 6+8-20, 7-7, 20-6+8 )
3. Null Modem, DB9 ( 1+6-4, 2-3, 3-2, 4-1+6, 5-5, 7-8, 8-7 )

DB9

DB15

DB25

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