Get_Parameter_Info command (ID
83hex) reads the properties of a single parameter from the GMP231. The command
is useful for adapting to parameters that have been added in a new software version. If the
requested parameter ID is not valid, data type Unknown Parameter ID
is returned.
Table 1. Get_Parameter_Info invoke
message
| Message segment |
Length |
Content |
| I2C address |
1 byte |
I2C address (write) |
| Command ID |
1 byte |
Always 83hex |
| Device address |
1 byte |
See Table 2. |
| Frame length |
1 byte |
Always 06hex. |
| Data |
1 byte |
Parameter ID |
| Checksum |
2 bytes |
See Checksum. |
Table 2. Get_Parameter_Info response
message
| Message segment |
Length |
Content |
| I2C address |
1 byte |
I2C address (read) |
| Status |
1 byte |
See Status byte. |
| Command ID |
1 byte |
Always 83hex |
| Device address |
1 byte |
See Table 2. |
| Frame length |
1 byte |
|
| Data |
1 byte |
Parameter ID |
|
1 byte |
Parameter datatype. See the following table. |
|
1 byte |
Parameter length in bytes. |
|
1 byte |
Parameter persistence. Describes if the parameter value is volatile
(lost at reset) or non-volatile (survives reset). See Table 4. |
|
≥8 bytes |
Parameter name. If name is shorter than 8 bytes, extra bytes are
filled with 00hex. |
| Checksum |
2 bytes |
See Checksum. |
Table 3. Parameter data types
| Code |
Meaning |
| 0 |
Unknown parameter ID |
| 1 |
Byte |
| 2 |
Integer (16-bit) |
| 3 |
Unsigned integer (16–bit) |
| 4 |
Float (32-bit) |
| 5 |
String |
Table 4. Parameter persistence
| Code |
Meaning |
| 0 |
Void |
| 1 |
Volatile |
| 2 |
Non volatile |