Those of you handy with a soldering iron may want to build your own cables
to interconnect two linux machines. The following cabling diagrams should
assist you in this.
Not all NULL modem cables are alike. Many null modem cables do little more
than trick your computer into thinking all the appropriate signals are
present and swap transmit and receive data. This is ok but means that you
must use software flow control (XON/XOFF) which is less efficient than
hardware flow control. The following cable provides the best possible signalling
between machines and allows you to use hardware (RTS/CTS) flow control.
Pin Name Pin Pin
Tx Data 2 ----------------------------- 3
Rx Data 3 ----------------------------- 2
RTS 4 ----------------------------- 5
CTS 5 ----------------------------- 4
Ground 7 ----------------------------- 7
DTR 20 -\--------------------------- 8
DSR 6 -/
RLSD/DCD 8 ---------------------------/- 20
\- 6 |
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