UM0239 datasheet(29/44 Pages) STMICROELECTRONICS

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UM0239

Ping sessions

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7.1

Opening a Ping Master session

7.1.1

Ping Master parameters

As shown in Figure 16, Table 24 following parameters can be selected for the Master device

and the ping session.

Figure 16.

Ping Master dialog box

Table 24.

Ping master parameters

Parameter

Description

Message settings

Master address

Defines the Address (from 1 to 255) of the Master device.

Nr. of slave

addresses

Defines the Number (from 1 to 255) of Slave devices. Slave Addresses start

from 1 to Nr. of Slave Addresses.

Nr. of messages

Defines the total number of messages to send to Slave devices. The messages

are numbered from 0 to Nr. of Messages. (Message “0” is used only to reset

Slave statistical data).

Repetition control

Repetition can be used to improve reliability of communication. When enable, if

a message is not Acknowledged it is sent until three times before to consider it

not Acknowledged.

Ping Wait Time and Message Number settings

Wait time

Defines the maximum wait time to obtain a valid response (with a valid

address) from Slave device before considering not Acknowledged the

message. The minimum value that can be selected depends on baud rate

selected according the round trip time of message transmitted.(1)

Messages sent

Defines the number of last message sent. It goes from 0 to Nr. of Messages

and it is updated at every new message sent.

ST7540 PING MASTER WINDOW

MESSAGE

SETTINGS

MEDIUM ACCESS

CONTROL

SETTINGS

CURRENT

MESSAGE

INFORMATIONS

EXECUTE/STOP

BUTTONS

STATISTICAL

INFORMATION

PING WAIT

TIME & MSG

NUMBER

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