User Manual

MHX-2400 Operating Manual: Chapter 3 Configuration Options 25

The Master determines the

Wireless Link Rate. This

setting on all other modems

is ignored..

S Register 102 - Serial Baud Rate

The Serial Baud Rate is the current speed that the modem is using to

communicate with the DTE. In command mode, the module “autobauds,”

meaning that it will adapt to the baud rate of the DTE equipment to which it

is connected. Therefore, when in command mode, you may change the baud

rate of your equipment, and the MHX-2400 will automatically adjust to this

baud rate once an AT string is issued. The new baud rate is stored in

instant you issue another command, the baud rate will revert back to that of

the DTE equipment. Therefore, it is advisable to operate in Command Mode

at the desired baud rate for Data Mode.

See page 14 for additional information.

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. Issuing the &Fx command (factory

default) does not affect the current setting of S102.

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. It is only necessary to set this

parameter on the Master unit. Units configured as Repeaters and Slaves will

ignore this setting, and adjust automatically to the rate of the Master.

The allowable settings are:

2 Fast without Forward Error Correction

*4 Fast with Forward Error Correction

Depending on the application requirements, each mode will provide

different throughput and performance. Appendix E. Performance Tables

give some indication of the performance to be expected in each mode.

In general, Forward Error Correction (FEC) reduces throughput, but in some

environments will actually increase throughput. FEC can reduce the number

of bad data packets, and hence reduce the need to retransmit.