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6ft Null Modem DB9F/DB25M Molded Cable
A NULL MODEM SERIAL CABLE enables two DTE or DCE devices to communicate with no conflict in data transmission.
- Connects two PC serial ports.
- The transmit and receive signals are crossed to ensure proper data transmission.
The following is how (based on pinouts from several websites) a DB9 - DB25 Null Modem Cable should be wired:
DB9 Pin 2 - DB25 Pin 2
DB9 Pin 3 - DB25 Pin 3
DB9 Pin 4 - DB25 Pin 6
DB9 Pin 5 - DB25 Pin 7
DB9 Pin 6 - DB25 Pin 20
DB9 Pin 7 - DB25 Pin 5
DB9 Pin 8 - DB25 Pin 4
I'm still a happy Monoprice customer and will continue to buy their products. To the Monoprice technical staff: it might be worth investigating this further. I don't know every RS232 cable configuration, but having pins 7&8 on the DB9 side bridged seems very strange.
PROS: High-quality molded plugs and cable
CONS: Incorrectly wired for DB9 to DB25 Null Modem