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RS232 Serial Modem Cable (DB9-DB25)

This cable should be used for DTE to DCE (for instance computer to modem) connections with hardware handshaking.

DB9 pin D-SUB female to the PCDB9 pin D-SUB female to the PC
DB25 pin D-SUB male to the modemDB25 pin D-SUB male to the modem

 FemaleMaleDirection
Shield1
Transmit Data32
Receive Data23
Request to Send74
Clear to Send85
Data Set Ready66
System Ground57
Carrier Detect18
Data Terminal Ready420
Ring Indicator922

Null modem (crossed) cable DB9 connectors
Null modem (crossed) cable DB9 and DB25 connectors
Null modem (crossed) cable DB25 connectors
Modem (straight) cable (DB25-DB25)