![]() ![]() TX RX are often yellow and green, but again you cannot count on this. ![]() You might hope that signal ground is blackbrown, though often it is green, or some other random color. If your serial communication is one-way then you might only use two pins: TX RX and GND.Ĭables that connect only some of the DB-9 serial lines are widely available, though do not assume that the same six pins are connected on all DB-9 cables.ĭepending on your needs, the six connected pins may or may not be sufficient.įor most modern needs (if modern can be used to apply to serial port in 2013) six wires is sufficient. In either DB-25 or DB-9 connector, which pins are actually used depends on the hardwaresoftware implementation of the serial protocol.Īt minimum, for two-way serial communication you need just three pins. ![]() 9 Pin Serial Cable Wire Colors Software Implementation Of The DB-9 RS-232 connector just takes the nine most popular pins from the DB-25 connector. If your meter is good, then connect one lead to to a random wire and then slide the other lead across the pins. 9 Pin Serial Cable Wire Colors Software Implementation Of. ![]()
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