User's Manual

MHX-900 Operating Manual: Chapter 3 Configuration Options 13
All units in a network must
be set to the same wireless
link rate.
S Register 102 - Serial Baud Rate
The Serial Baud Rate is the current speed that the modem is using to
communicate with the DTE. When the AT command prefix is issued, the
modem performs an ‘autobaud’ operation and determines what the current
DTE baud rate is set to. The S register value returns the current setting of
the DTE baud rate.
The possible values are:
1 115200
2 57600
3 38400
4 28800
5 19200
6 14400
*7 9600
8 7200
9 4800
10 3600
11 2400
It is generally advisable to choose the highest rate that your terminal
equipment will handle to maximize performance, unless a limitation on the
available bandwidth is desired. If the DTE is a personal computer, the port
can usually be used reliably at 115200.
S Register 103 - Wireless Link Rate
The Wireless Link Rate is the speed and optimization method for which
modems will communicate over the RF link.
The allowable settings are:
* 1 Turbo
2 Fast
3 Normal
Depending on the application requirements, each mode will provide
different throughputs and performance optimizations as follows:
Mode
Expected Performance
(Maximum Throughput)
Primary Optimization
Turbo 96 kbps Optimized for Speed
Fast 60 kbps Optimized for Distance and Speed
Normal 30 kbps Optimized for Distance
Generally, the lowest rate which provides sufficient bandwidth should be
selected. For example, if DTEs are set to communicate at 19.2 kbps, then
the wireless rate can be set to Normal (with the added advantage of slightly
greater range). If DTEs require nearly 115.2 kbps of sustained bandwidth,
then the wireless rate should be set to Turbo (setting it lower would
“bottleneck” data transmissions in the wireless link). Note that there is a
compromise between speed, performance and range.