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View Full Version : 4 the Newbie - Null Modem Cable Pinouts



zafgak
10th December, 2010, 01:30 PM
For the absolute Newbie's who do not know what the pinout is for a null modem cable -- here you go

Signal Name DB-25 Pin DB-9 Pin DB-9 Pin DB-25 Pin
FG (Frame Ground) 1 - X - 1 FG
TD (Transmit Data) 2 3 - 2 3 RD
RD (Receive Data) 3 2 - 3 2 TD
RTS (Request To Send) 4 7 - 8 5 CTS
CTS (Clear To Send) 5 8 - 7 4 RTS
SG (Signal Ground) 7 5 - 5 7 SG
DSR (Data Set Ready) 6 6 - 4 20 DTR
CD (Carrier Detect) 8 1 - 4 20 DTR
DTR (Data Terminal Ready) 20 4 - 1 8 CD
DTR (Data Terminal Ready) 20 4 - 6 6 DSR

RuberDuck
10th December, 2010, 02:35 PM
why bother making one when you can get one for ?2.00 maybe ?3.00 from some well known internet sites ?