User's Manual

9XCite Wireless OEM Module – Product Manual v1.0
<VID><ATHP><ATDT><PSN><Pay Load><CRC>
<VID> Factory assigned Vendor ID number
<ATHP> Channel (or Network) number
<ATDT> Module Address
<PSN> Packet Serial Number (8-bit number that uniquely identifies each packet)
<Pay Load> Data shifted into module for transmission
<CRC> 16-bit CRC (like a checksum) for error detection
Timing Specifications
The diagram below [Figure 4] shows 9XCite Modules providing an RF Link between hosts.
Figure 4. System Block Diagram
DI (data in)
DO (data out)
CTS
RTS / CMD
HOST A
XCite
Module A
XCite
Module B
DI (data in)
DO (data out)
CTS
RTS / CMD
HOST B
The RF data flow sequence is initiated when the first byte of data is received by the transmitting
9XCite Module. As long as 9XCite Module A is not already receiving data, the serial data goes into
the DI Buffer, is packetized and then transmitted to 9XCite Module B.
Figure 5. Timing Specifications (“A” and “B” are associated with figure 4)
A Transmits over air
B Receives
T
ST
T
TX
T
TL
T
RL
Host A sends serial data to XStream Module A
After 1st byte is received, contents of D Buffer
are assembled into packet and transmitted
IN
TX/PWR LED on XStream Module A pulses off
briefly to indicate RF transmission
If 16-bit CRC checks out, data is shifted out
serial port to Host B
(Optional) Set ATCS = 1 to use CTS as RS-485
TX enable low-asserted signal
RXLED pulses on briefly to indicated RF receive
activity
D A
IN
RF A
OUT
TXLED A
D B
OUT
RXLED B
CTS B
© 2003 MaxStream, Inc., Confidential and Proprietary 4