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Notice that this interface provides a positive voltage on pin 4 of the DB9 connector. Also notice

that pin 5 should be grounded, but it is run through a low value resistor for protection.

This is the interface type provided for both COM1 and COM2 on the RUC board.

The second type of serial interface is called a DCE interface and is the type of interface used

with peripheral equipment. Recognize that pin 4 needs a voltage on it in order for this circuit to

work.

DB9

DCE

Peripheral End

PPIM Board

GND

DTR

Device -i.e., PIM

Serial Cable

N/C

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Web Mountain Technologies RUC-01 Guía de usuario Pagina 81