Command Structure
Command Structure

Command Structure

Byte
7
6
5
4
3
2
1
0
0
Length (not including the checksum)
1
SSI_MGMT_COMMAND (0x80)
2
Message Source (4 - Host)
3
Reserved (0)
Reserved (0)
Reserved (0)
Cont'd packet
Retransmit
4
Payload data (see the following example)
...
Length -1
Length
2's complement checksum (MSB)
Length +1
2's complement checksum (LSB)
The expected positive response is SSI_MGMT_COMMAND which can be a multi-packet response. Devices that do not support this command respond with the standard SSI_NAK.