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2. ? RF ? Module ? Operation
WARNING: 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.
2.1. Serial Communications
The XTend OEM 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).
2.1.1. 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.
Figure ? 2 ‐ 01. 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.
Figure ? 2 ‐ 02. 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)
The module UART performs tasks, such as timing and parity checking, that are needed for data
communications. Serial communications depend on the two UARTs to be configured with compati-
ble settings (baud rate, parity, start bits, stop bits, data bits).
? ? 2007 ? MaxStream, ? Inc.
????? 9
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