Host interface
commands
UM2241
18/26
DocID030767 Rev 1
Applicative payload (variable)
Only commands having the protocol type equal to 0 shall be processed, if a command with
a different protocol type is received it shall be discarded and no action performed.
2.7
HI_Ping
HI_Ping commands can be used to periodically test the serial link between the host
controller and the ST75MM modem, and the healthy state of the modem itself. If the
HI_Ping fails (once or several times) a hardware reset shall be issued to restore the
ST75MM functionalities.
2.7.1
HI_PING request
Issued by: host controller
Command code: 0x2C
Payload size: variable
Payload content:
Test sequence (variable)
The test sequence can be any possible sequence and length (between 1 and 256).
2.7.2
HI_PING positive confirm
Issued by: ST75MM
Command code: 0x2D
Payload size: variable
Payload content:
Test sequence (variable)
The test sequence is the same received within the request command.
2.8
HI_Error
This command is issued by the ST75MM when a well formed command frame is received
but the command code has not been recognized.
2.8.1
HI_ERROR indication
Issued by: ST75MM
Command code: 0x36
Payload size: 1 byte
Payload content:
Command code received (1 byte)
