Appendix

Terminal Block Pin Assignments

Pin

DCE/DTE

 

 

1

Transmit +V

 

 

2

Transmit -V

 

 

3

Receive -V

 

 

4

Receive +V

 

 

Circuit Test

To test the IC-485AI’s internal circuits, connect a dumb terminal to the unit and do the following:

1.Set the DCE / DTE switch to the opposite of the terminal.

2.Set all DIP Switch segments to ON.

3.Connect one wire from Tx+ (1) to Rx+ (4); connect a second wire from Tx- (2) to Rx- (3).

4.Set the terminal to Full Duplex.

5.Set the baud rate of the communicaton application to 1200 bps.

6.Enter data.

If the circuit is operational, data appears on the screen

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