Siemens AC75 manual Not Acknowledge

AC75 AT Command Set

19.8 AT^SSPI

s

when the I²C slave device notifies that it has recognized the I²C Slave Address.

Not Acknowledge:

During a Transmit Transfer, a NAK is given when the I²C Slave Device notifies a failure to receive either the I²C Slave Address or a data byte. In this case, a Stop Condition is sent to the I²C device.

During a Receive Transfer, a NAK is transmitted only when the I²C does not receive any reponse for the I²C Slave Address. The I²C device never acknowledges the validity of the received data (by sending an ACK the master acknowledges each received byte to the slave).

AC75_ATC_V01.002	Page 503 of 569	10/30/06
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