ELPRO 805U-E Manual do Utilizador descarregar pdf (Página 31)

Chapter Three Operation

Page 31 © April 2007

The factory-default settings for the radio port will be correct for the majority of applications.

Only make changes if you experience operating problems.

Select the “Radio” Menu to change the following configuration parameters. If a change is

made, you need to select “Apply Changes and Save” to retain the changes.

Power Level The RF power level is selectable between 500mW (27dBm) and 50mW

(17dBm). The default value is 500mW.

Data Rate The radio baud rate in bits per second (bps). The data rate can be

configured to a fixed rate up to 76.8 Kbps, or set to “Auto”.

The default value is Auto. In Auto mode, the 805U-E will

automatically adjust the data rate to the fastest rate for reliable

operation in each radio path.

Fade Margin

This is the difference (in

dB) between the received

radio signal and the

receiver sensitivity

(minimum radio signal).

When automatic rate is selected, the 805U-E initially chooses a rate

based on the received signal strength of transmissions.

Firmware

version 1.32 and later will then adjust rate on each channel to

according to packet errors. Earlier versions will adjust rate based

upon the received signal strength.

The Fade Margin value is used by

the 805U-E to determine what initial data rate should be selected. In

firmware versions before v1.32, it is also used to select the current

radio rate. A larger Fade Margin means that the 805U-E will select a

lower initial rate.

The default value is 10 dB.

Beacon Period

This interval is the period

between beacon

transmissions sent by an

Access Point.

The Beacon Interval is also related to the scan period on a Client. Re-

association interval is (6) times the Beacon Interval when the link has

been inactive.

Access Points will timeout after 12 times the Beacon Interval if no

response is heard.

Refer to Section 3.1 for more information.

The default value is 10 seconds. This should be adjusted to larger

values as the system is increased in size. This will reduce the overhead

of checking each link, at the expense of response time when a link is

dropped.

Fragmentation Threshold

The maximum

transmission unit (MTU)

of data over the radio.

This selects the maximum number of bytes that will be transmitted in

one message. If more than this number of bytes is input into the 805U-

E, the module will transmit more than one message.

The default value is 500 bytes.

If fixed radio rates are configured, this value can be increased and will

reduce radio transmission overhead. For 76.8 Kbps , the fragmentation

threshold can be increased to 2000, and at 38.4Kbps, to 1000.

However if the radio path is poor, or there is high radio interference,

increasing this value will decrease system performance as the number

of re-try messages will increase.

If Ethernet traffic is only small packets sizes (ie <300 bytes), an

improvement in overall throughput rate can be achieved by reducing

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