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DB9/DB25 Computer/Modem Signal Directions - Illustration

DB9 to DB25 Cables

Computer (DTE DB9 Device) to Modem (DCE DB25 Device) Signal Connections and Modem (DCE DB9 Device to Modem (DCE DB25 Device) Signal Connections explained. Pins defined. Straight Cable DB9 to DB25 provides the DTE to DCE connection and a Crossover DB9 to DB25 cable provides the DCE to DCE connection.

Note: Signal directions reversed if both devices are DTE but pin connections are the same.