UM0239 datasheet(32/44 Pages) STMICROELECTRONICS

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Ping sessions

UM0239

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7.2.2

Starting a Slave Ping session

Click Ping Start to start the ping session and enable the reception of data.

Click Ping Stop to end the ping session.

Click Close to close the Ping Slave dialog box.

7.3

Ping protocol

The Ping session consists of an exchange of packets between one Master device and one

or more Slave devices. Figure 18 shows the ping message exchange format.

Figure 18.

Ping message format

Statistical data display

The following statistical data are collected:

– OK messages: the total number of messages properly received plus those

corrected through FEC

– Corrected messages: the number of messages corrected through FEC

– RX more than once: the number of messages received more than once

– KO messages: the number of message not received

– Wrong FCS messages: the number of messages with incorrect FCS even

after correction

– Not RX messages: the number of message not received, calculated by

subtracting the number of total message received (both the correct and the

incorrect ones) from the number of last message received (Last Received

Message field)

Click Get Statistical Data to update statistical data. Click Save Statistics to

store collected data in a text file.

Table 25.

Ping slave parameters (continued)

Parameter

Description

ST7540 PING MESSAGE FORMAT

Field

TRANSMITTED MESSAGE

22 bytes (CODED)

Byte nr.

Field

ORIGINAL MESSAGE

(NOT CODED)

FEC

preamble+header

FCS field

repetition

Message

number

transmitter

Address

receiver

Address

Byte nr.

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