User's Manual

CDR-915L OEM DATA RADIO MODULE
___________________________________________________________________________________________
Revision M INTEGRATOR’S GUIDE
15
CDR-915L D ATA R ADIO
H ARDWARE INTERFACE
Pin Definitions for Connector P2
PIN FUNCTION
1 Ground
2 CTS
3 DTR
4 Receive Data
5 Transmit Data
6 Reset
7 SPI Clock
8 SPI MISO/Fail
9 SPI MOSI/Sending
10 VCC
PIN 1 – Ground
Power and signal ground for the data radio.
PIN 2 – CTS
Clear to Send. This line will be low when the radio is ready to accept
data to transmit. When the radio raises this line, the user application
must cease sending data to the radio or a buffer overflow may occur,
resulting in a loss of data.
PIN 3 – DTR
Data Terminal Ready. This line is used to place the radio into
configuration mode. It should be held low for normal operation.
PIN 4 – Receive Data
This is data received by the radio and sent out to the user device. 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 one stop