AN2451 datasheet(41/55 Pages) STMICROELECTRONICS

41 / 55 page

AN2451

Performance and ping tests

Doc ID 12791 Rev 3

41/55

Performance and ping tests

Our evaluation system includes a ping test embedded into the ST7540 powerline modem

demonstration kit and the FW of the EVALCOMMBOARD. This feature allows the user to

perform in-field communication tests and to evaluate reachability of PLC network nodes.

A ping session is based on a master board sending a sequence of messages to one or more

slave boards. if the messages are correctly received by the slave boards, they are resent

one by one to the master.

The PC connected to the master keeps statistics of the messages sent and correctly

received by the slave boards, thus making it possible to get a numerical evaluation of the

reachability of each node corresponding to a slave.

Figure 39 represents the ping window of the ST7540 powerline modem demonstration kit for

the master node. The main characteristics of this tool are indicated in red.

Figure 39.

ST7540 powerline modem demonstration kit window for the master board

Special controls are included in the ping test:

●

Repetition control: may be used to improve communication reliability. When repetition

control is enabled, a message not responded by a slave is resent up to three times

before sending a new message

●

Medium access control: defines what type of medium access has to be used. Choices

are “none”, “BU” or “PD”. In the last two cases, messages are sent to the slave only if

the BU or CD/PD lines of the ST7540 modem are not active. If the PD setting is

selected, the content of the ST7540 internal control register is changed to select

“Preamble” as the detection method.

For further details about ST7540 powerline modem demonstration kit, please refer to the

user manual UM0239 “ST7540 power line modem demo kit graphical user interface”.

Repetition

Control

Medium

Access

Control

Last

Message

Status

Numerical

Statistics

Graphical

Statistics

Number of

Slaves

(up to 255)

Number of

Messages

AN2451 Datasheet(PDF) 41 Page - STMicroelectronics

AN2451 Datasheet(HTML) 41 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

Datasheet Download

Link URL