Null-Modem Cable - Pin Out
Document Version: 001b.15-September-2006 Howie Dines
Cables these days are so cheap, it's probabily not worth the
time and effort making-up a null-modem cable. ( Also known as a "Laplink Cable" )
However, there is always that one time when you find yourself
caught short without one. The following details will help you on
the way to make it.
9 Pin D-Sub Connectors RS232 DE-9
(Also, incorrectly known as DB-9 !)
When viewed from the front of
i.e. not the pins solder side.
The pin numbering layout used can
be seen in the table below.
| || ||
| Transmit Data||TD||3
| Receive Data||RD||
| Request To Send||RTS||7
| Clear To Send||CTS||
| Signal Ground||SG||5
| Data Set Ready|
|6 + 1||
| Data Terminal Ready||DTR||4
||1 + 6||CD|