UM0934 datasheet(99/113 Pages) STMICROELECTRONICS

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UM0934

Modem configuration

Doc ID 17389 Rev 2

99/113

Modem configuration

The first step to configure the ST7570 modem in accordance with the required operating

conditions is the writing operation of MIB object 00A1h (PLC configuration) (Section 6.5.30).

This step is aimed at allowing the ST7570 device to communicate through a power line

network and the time diagram of the commands exchanged between the ST7570 and its

external host is represented in Figure 28.

Figure 28.

Host interface: MIB object writing command sequence

For example, in order to set the operating parameters as listed below, leaving the other

parameters involved in MIB object 00A1h at their default values:

●

Access layer mode = MAC mode

●

Operating mode = Client

●

Mains frequency = 50 Hz

●

Bit rate = 2400 bps

●

Target output gain = -15 dB

●

Current Limiting = enabled.

The exchanged local frames are as follows:

CMD_WriteDBRequest()

The local frame is built and sent by the external host through the host interface with the

dedicated command CMDWriteDBRequest, after receiving a Status Message (NOT_SET bit

= 1) from the ST7570:

STX Length

Command

Code

DATA

CHK

02h 13h

41h

7E.02h

MIB Index

Mode

Gain

09h

10h

44.F7.00h

A1. 00h

00h

10.21.01h

00.00.00h

PAD

Current

Ctrl

Layer

01h

02h

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