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4 Receiver +V Receiver 2 +V

DCE / DTE Connection Table

Because of the polarity of the communication signals, a DTE configured device must connect to a

DCE configured device. The shaded area in the figure below is an example of a DTE to DCE

connection:

Self Test

To test tthe internal circit of the interface converter, connect a dumb terminal to the unit and do the

following:

Set SW1 to DCE (if the dumb terminal is configured for DCE.1.

Set SW2 to TxON, RxON.2.

Connect a wire from pin 1 (Tx+) to pin 4 (Rx+)3.

Connect a wire from pin 2 (Tx-) to pin 3 (Rx-)4.

Set the terminal to full duplex and enter data.5.

If the data displays on the screen, the internal circuit is operational.

Troubleshooting

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ATEN RS-485 User Manual Page 9