UM0934 datasheet(64/113 Pages) STMICROELECTRONICS

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Management information base (MIB)

UM0934

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Doc ID 17389 Rev 2

Management information base (MIB)

The MIB collects all the parameters that allow the host to set and control the modem

operation.

The host can update an MIB object through a CMD_WriteDBRequest specifying the object

index and related value(s). The modem returns a confirmation message

(CMD_WriteDBConfirm()) if the write request was correct, otherwise it returns an error

message (CMD_WriteDBError()) according to the command failure.

Each MIB object can also be read by using the CMD_ReadDBRequest command. If the

read request is correct the modem returns a confirmation message

(CMD_ReadDBConfirm), otherwise it returns an error message (CMD_ReadDBError)

according to the command failure.

Both read and write confirm messages (CMD_WriteDBConfirm() and

CMD_ReadDBConfirm) have the same syntax and are specific for each MIB parameter.

6.1

MIB write request

This command is used by the external host to update the value of an object of the ST7570

MIB. A CMD_WriteDBRequest is composed of two fields, as in Table 68:

Both index and data field must be sent LSByte first.

The ST7570 checks the request for validation. Then, according to the result of the check:

●

if valid, the object is updated in the MIB and the ST7570 replies with a

CMD_WriteDBConfirm()

●

if not valid, the request is rejected and the ST7570 replies with a CMD_WriteDBError().

In the following sections the details of all accepted index and data fields are described, as

well as the error messages returned for each parameter.

Table 67.

CMD_SyntaxError: ErrorData

Byte index

Label

Description

ERROR

01h: Error

Table 68.

MIB write request: Data

Byte index

Label

Description

0..1

INDEX Object index (2bytes). Refer to the MIB table (

Table 71) for available objects.

2..variable

DATA

Data to be written into the MIB location INDEX.

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