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Negative Acknowledge Last Byte
On supported adapters, the doNak checkbox gives you the option to acknowledge,
or negatively acknowledge, the last byte read from a slave device. Some Slave
Transmitter Devices require a negative acknowledgment on the final byte read from
the slave device. I
2
C adapters not supporting this option automatically negatively
acknowledge the last byte read.
5.1.4.1.6 Master Transmit and Receive
The Master TxRx button sends a master write message with no Stop Condition,
immediately followed by a Repeated Start master read message with Stop.
5.1.4.2 Slave Operations
In addition to performing I
2
C Bus master operations, the Message Manager can also
perform I
2
C bus slave transmit and receive operations.
5.1.4.2.1 Slave Transmit Data
Slave transmit data is entered in the Slave Tx Message Bytes text box control on the
main screen. Data in this text box is automatically sent to a requesting master upon
receiving a slave transmit request.
Like Master Transmit data, Slave Transmit data is entered with the data editor. To
enter data to be transmitted, click on the Slave Tx Message Bytes text box to open
the data editor. See “Specifying Master Tx Message Bytes” section for data entry
details.
5.1.4.2.2 Slave Receive Data
Data bytes received from a Master Transmitter are automatically displayed in the
main application screen Received Message window. Received data is displayed in
ASCII printable, or hexadecimal (~00 to ~FF) formats. Use the Hex-Display
checkbox to force ASCII printable data to display in hexadecimal format .