User's Manual

CDR-915L OEM DATA RADIO MODULE

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Revision M

INTEGRATOR’S GUIDE

bit (high). This is a TTL-level interface. Applications requiring RS-232

must use an appropriate interface circuit or a CDR-915L RS-232

interface board.

PIN 5 – Transmit Data

This is the data sent by the user device for the radio to transmit. The

data format is a standard asynchronous stream at the user-set baud

rate with one start bit (low) followed by eight data bits and at least

one stop bit (high). This is a TTL-level interface. Applications

requiring RS-232 must use an appropriate interface circuit or a CDR-

915L RS-232 interface board.

PIN 6 – Reset

Taking this pin low will reset the radio’s microcontroller. For normal

operation, this pin should be left open.

PIN 7 – SPI Clock

This pin is used for updating the code in the radio.

PIN 8 – SPI MISO

This pin indicates a failure to complete an transmission while in Ack-

Back™ mode. This pin is also used for updating the code in the radio.

PIN 9 – SPI MOSI

This pin indicates the radio is attempting a transmission while in Ack-

Back™ mode. This pin is also used for updating the code in the radio.

PIN 10 – VCC

This is power to the radio. It should be 7.5 to 15 vdc.