Get_Parameter - GMP231

GMP231 User Guide

Document code
M211501EN
Revision
E
Language
English (United States)
Product
GMP231
Document type
User guide

Get_Parameter command (ID 81hex) 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 FFhex bytes.

Table 1. Get_Parameter invoke message
Message segment Length Content
I2C address 1 byte I2C address (write)
Command ID 1 byte Always 81hex
Device address 1 byte See Table 2.
Frame length 1 byte Always 06hex
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 81hex
Device address 1 byte See Table 2.
Frame length 1 byte Varies according to data length, 07hex ... 39hex.
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.