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Appendix
Terminal Block Pin Assignments
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
Pin DCE/DTE
1 Transmit +V
2 Transmit -V
3 Receive -V
4 Receive +V