25 to 25 pin null modem    Connecting two 25 pin serial ports
25 to 9 pin correspondence Mapping pins between 25 & 9 pin connectors
25 to 9 pin null modem     Connecting 25 pin to 9 pin serial ports
9 to 9 pin null modem      Connecting two 9 pin serial ports
baud and BPS               Baud rate versus bits per second
common modem problems      Hints for modem setup
connectors                 Connectors and their sex
data bits                  Discussion of 7/8 data bits
DCE/DTE                    RS-232 equipment types
duplex                     Discussion of full and half duplex
noise                      Some hints on reducing noise in RS-232
parity                     Discussion of parity
pins                       Definition of the connector pins
stop bits                  Discussion of stop bits.
true cables                Cables to connect a computer to a modem
voltages                   Voltages involved in RS-232