AN2744 datasheet(13/56 Pages) STMICROELECTRONICS

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AN2744

Evaluation tools description

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This complete communication node, controlled by the ST7538Q power line modem

demonstration kit, implements real communication at bit level, simply sending or receiving a

user-defined bit stream.

It is possible to establish a half-duplex communication between two of these communication

nodes connected to each other. For better evaluating communication performances, the

ST7538Q power line modem demo kit software tool has some particular features, including:

●

Frame synchronization: a frame synchronization header can be added to the

transmitted data to set up a simple protocol, intended to test the capability of the

system to correctly receive the exact bit sequence as it has been transmitted. This

feature can be enabled in the Rx panel of the ST7538Q power line modem

demonstration kit. A bit synchronization can be introduced as a simpler feature by

enabling the preamble detection method in the control register panel and then inserting

at least one "0101" or "1010" sequence at the beginning of the bit stream to be

transmitted.

●

Ping session: a master-slave communication with automatic statistics calculation can

be useful to test a point-to-point or a point-to-multipoint power line communication

network, thus providing a method to evaluate reachability of each node in the network.

For further details about the ST7538Q power line modem demonstration kit tool, please

refer to user manual UM0241 "ST7538 power line modem demonstration kit graphical user

interface”.

Figure 5.

Power line modem demonstration kit with transmission session window

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