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RF Module operation
WARNING!
Serial communications
The XTend RF Modules interface to a host device through a TTL-level asynchronous serial port. Through its serial port,
the module can communicate with any UART voltage compatible device or through a level translator to any serial
device (For example: RS-232/485/422 or USB interface board).
UART data flow
Devices that have a UART interface can connect directly to the pins of the RF module as shown in the figure below.
System Data Flow Diagram in a UART-interfaced environment (Low-asserted signals distinguished with horizontal
line over signal name.)
Serial data
Data enters the module UART through the pin 5 as an asynchronous serial signal. The signal should idle high when no
data is being transmitted.
Each data byte consists of a start bit (low), 8 data bits (least significant bit first) and a stop bit (high). The following
figure illustrates the serial bit pattern of data passing through the module.
UART data packet 0x1F (decimal number "31") as transmitted through the RF module Example Data Format is 8-N-1
(bits - parity - # of stop bits)
XTend RF Module User Guide
When operating at 1 Watt power output, observe a minimum separation distance of 2' (0.6m) between
modules. Transmitting in close proximity of other modules can damage module front ends.
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