User's Manual

9XCite Wireless OEM Module – Product Manual v1.0
RF System Components
Serial Communications
The 9XCite Wireless OEM Module interfaces to a host device through a CMOS-level asynchronous
serial port. Through its serial port, the 9XCite Module can communicate directly with any UART-
interfaced or RS-232/485/422 device. [Timing specifications illustrated on page 4]
UART-Interfaced Data Flow
Devices that have a UART interface can connect directly through the pins of the 9XCite Wireless
OEM Module as is shown in the figure below.
Figure 7. Data Flow in a UART-interfaced environment
(Low-asserted signals distinguished with horizontal line over signal name.)
DI (data in)
DO (data out)
CTS
RTS
Microcontroller
CMOS Logic CMOS Logic
Microcontroller
XCite
Module
XCite
Module
DI (data in)
DO (data out)
CTS
RTS
RS-232 and RS-485/422 Data Flow
Wiring the 9XCite Module to a host device serial port enables the host device to communicate
wirelessly. To transmit, the host device simply sends serial data to the 9XCite Module pins. The
9XCite Module then converts the data to Frequency Hopping Spread Spectrum (FHSS) or Single
Channel FCC-approved wireless data. Once transmitted, the over-the-air data can be detected by
receiving 9XCite Modules, checked for integrity and then sent to a receiving device [Figure
below].
Figure 8. Data Flow in RS-232 and RS-485/422 environments.
(Low-asserted signals distinguished with a horizontal line over signal name.)
CMOS Logic
TX
RS-232 Logic CMOS Logic RS-232 Logic
XCite
Module
RTS
CTS
RX
MaxStream
Interface
Board
PC
PC
DO (data out)
RTS
DI (data in)
CTS
MaxStream
Interface
Board
TX
RTS
CTS
RXDO (data out)
RTS
DI (data in)
CTS
XCite
Module
© 2003 MaxStream, Inc., Confidential and Proprietary 6