Editing Null modem (section)

=== Loopback handshaking ===
{{Multiple image
 | direction = horizontal
 | width     = 200
 | image1    = Null modem 3-wire.svg
 | image2    = Null modem DB-9 3-wire.svg
 | footer    = Wiring pinouts for DB-25 (left) and DE-9 (right) connectors
}}

Because of the compatibility issues and potential problems with a simple null modem cable, a solution was developed to trick the software into thinking there was handshaking available. However, the cable pin out merely loops back, and does not physically support the hardware flow control.<ref name="lammertbies" />

This cable could be used with more software but it had no actual enhancements over its predecessor. The software would work thinking it had hardware flow control but could suddenly stop when higher speeds were reached and with no identifiable reason.

{{Clear}}