Get_Parameter - GMP231

GMP231 User Guide

Document code

M211501EN

Revision

Language

English

Product

GMP231

Document type

User guide

Get_Parameter command (ID 81_hex) reads parameter values. You can use it to read both measurement results and operational parameters. If the master tries to read more bytes than message size, the slave sends FF_hex bytes.

Table 1. Get_Parameter invoke message
Message segment	Length	Content
I²C address	1 byte	I²C address (write)
Command ID	1 byte	Always 81_hex
Device address	1 byte	See Table 2.
Frame length	1 byte	Always 06_hex
Data	1 byte	ID of parameter to be read
Checksum	2 bytes	See Checksum.

Table 2. Get_Parameter response message
Message segment	Length	Content
I²C address	1 byte	I²C address (read)
Status	1 byte	See Status byte. If requested parameter ID was unknown, NACK bit is set in the status byte.
Command ID	1 byte	Always 81_hex
Device address	1 byte	See Table 2.
Frame length	1 byte	Varies according to data length, 07_hex ... 39_hex.
Data	1 byte	ID of parameter
	1 ... 50 bytes	Value of parameter. If requested parameter ID is unknown, these data bytes are left out of the response.
Checksum	2 bytes	See Checksum.