UM0239 datasheet(31/44 Pages) STMICROELECTRONICS

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UM0239

Ping sessions

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7.2

Opening a Ping Slave session

7.2.1

Ping Slave parameters

As shown in Figure 17, Table 25 following parameters can be selected for the Slave device

and the ping session.

Figure 17.

Ping slave window

Table 25.

Ping slave parameters

Parameter

Description

Slave address settings

Slave address

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

Medium access control settings

Medium Access

Control

Defines which type of medium access is used. Choices are “none”, “BU” or

“PD”. In the two last settings packets are sent only if respectively BU or CD/PD

lines are not active. If “PD” is selected while “Carrier Detection” CR control is

used, content of Control Register is changed in order to select the detection

method to “Preamble detection”.

Max Wait Slot Nr.

If BU or CD/PD lines are actives (depending on Medium Access Control

selected), the Slave waits for a time selected randomly between 4ms and

4*Max Wait Slot Nr. ms before to analyze if it is possible to transmit a packet.

Max Wait Time

Defines the maximum time to wait when “BU” or “PD” Medium Access control

are selected before to transmit the packet. When the Max Wait Time is

elapsed, the packet is transmitted even if BU or CD/PD lines are actives.

Last received message information

Last Received

Message

Shows the number of last message received. This field is updated only when

Get statistical Data button is pressed.

ST7540 PING SLAVE WINDOW

SLAVE

ADDRESS

MEDIUM ACCESS

CONTROL

SETTINGS

LAST RECEIVED

MESSAGE

INFORMATIONS

EXECUTE / STOP /

CLOSE BUTTONS

STATISTICAL

INFORMATION

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