UM0240 datasheet(29/39 Pages) STMICROELECTRONICS

29 / 39 page

UM0240

Software

29/39

Figure 16.

The main window

Through the Main Window it is possible to access all software functions. Four different

panels are available:

●

Control Register Panel

Controls present on Control Register Panel allow to modify all the Control Register

Parameters and to write/read the ST7538/ST7540 Control Register.

●

Transmission Panel

Two method of transmission are available: Sequence and Continuous. With Sequence

method a message can be transmitted across the Mains for n Times, with a delay

between transmissions of 300ms.

Selecting Continuous transmission mode a unique transmission session is performed

and the message to transmit is sent repeatedly across the Mains until the transmission

is interrupted by user or by a Time Out event.

On Industrial Communication Board the transmission session is notified by means of

orange led DL4 that is turned on when the line Rx/Tx is put to "0" logic (i.e. TX session

is on going). When a Time Out Event occurs, the red led DL2 is turned on too.

●

Receiving Panel

When the device is in Reception mode the green led DL3 of Industrial Communication

Board is turned on.

Two reception methods are available:

–

Reception with synchronization

Due to fact that is not possible to know when the ST7538/ST7540 begins to

demodulate data incoming from the mains, frame synchronization can be required

in order to know when data flow begins. When Frame synchronization is enabled,

the data flow from modem is filtered from the MCU and only when a header is

recognized the data are sent to PC. In this way is assured that, if the transmitted

message is preceded by a preamble (i.e. 0xAAAA o 0x5555) and a header (i.e.

0x9B58), all the following bits are correctly sent to PC. In ST7540 this function can

be performed directly by the modem itself programming the Control register so no

controls are present on the reception window.

–

Reception without synchronization

With this method, data incoming from the modem are sent directly to the PC.

●

Ping Panel

In order to evaluate the reliability of a communication between two or more devices a

Ping session can be performed. A full variety of statistical data can be collected and an

algorithm of error correction is also included. The ping session consists of a Master that

MENU BAR

TOOLBAR

STATUS BA R

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