, or

All serial connectors used on P.C's. are 25 or 9 pin 'D' type, the function of the pins is shown in the table below.
signal name rs-232c
d-type
9 pin		 rs-232c
d-type
25 pin
DCD(in) 1 8
RSD(in) 2 3
TXD(out) 3 2
DTR(out) 4 20
Signal Ground 5 7
DSR(in) 6 6
RTS(out) 7 4
CTS(in) 8 5
RI (in) 9 22

There are many ways to connect two devices together using the serial ports. The main three are shown below:
  1. 'Standard' Serial lead.

     

    2.
  2. 'Typical' Serial lead.

     

     

    3.
  3. 'Laplink' Cable.

     

     

    4.

The information contained upon this page is supplied in good faith, and to the best of my knowledge is accurate.
However, I accept no responsibility for damage or injury, however caused, due to the use of this data.