MCC MIIC-203 Guida Utente Scaricare il pdf (Pagina 60)

the I

C Bus, the iPort/USB outputs a Slave Transmit Request to its Host device, and

initiates an I

C Clock Stretch (SCL Low) until a Slave Transmit command is

received from the Host computer. While clock stretching, no other messages can be

transmitted on the I

C Bus.

Note 2: The tilde (~) character and the Carriage Return (CR) characters are used as

special marker characters within all iPort/USB transmitted text messages. These

characters may not be used within the text of a message, but must be replaced by

the following "Hex equivalent" characters:

Tilde replaced by "~7E"

Carriage Return replaced by "~0D"

iPort/USB automatically translates "Hex equivalent" characters to their single-byte

value for transmission across the I

C Bus.

All entered data bytes are transmitted to the requesting Master Receiver device.

Slave Transmit stops upon receiving the first negative acknowledgment (Nack)

from the Master Receiver.

Command: /Stext[CR] 'Slave Transmit Message

Response 1: /STC[CR] 'Slave Transmit Complete

Response 2: /I88[CR] 'iPort Connection Not Open

Response 3: /I8A[CR] ‘Slave Transmit Request Not Active, Cmd Ignored

Default Setting: None

Examples:

/Sabcd1234[CR] ‘ASCII Printable characters "abcd1234"

/S~00~01~02[CR] ‘Binary data bytes 00, 01,02

/Sab~7Ecd[CR] ‘Tilde embedded in ASCII Printable characters

/S12~0D24[CR] ‘Carriage Return embedded in ASCII Printable

characters

Master Transmit Message

Write the specified data bytes to the currently selected Destination I

C Slave

Address with or without generating an I

C Stop condition after the last byte is

transmitted.

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MCC MIIC-203 Guida Utente Pagina 60