User Manual

USER MANUAL

APPX. B

APPENDIX B – OEM-900 TTL Connection Diagram

Power Connector

Pin Number Description

1 Positive Power (9-30VDC)

2 TTL level RTS (out)

3 TTL level CTS (in)

4 TTL level Receive (in)

5 TTL level Transmit (out)

6 Auxiliary In/Out #1 (RSSI)

Indicator Lights

Light Color Description

Yellow On solid if connected to another radio, otherwise flashes.

Green Blinks when transmitting serial data out the serial port.

Red Blinks when receiving serial data from the serial port.

NOTE: All TTL levels use 3.3VDC logic levels (but will tolerate 5V levels)