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The ASCII code point for ACK is 0x06 (binary 0000 0110). By convention a receiving device sends an ACK to indicate it successfully received a message. ASCII also provides a NAK code point (0x15, binary 0001 0101) which can be used to indicate the receiving device cannot, or will not, comply with the message. [2]
Note that the bit rates are quoted for the transfers between controller (master) and target (slave) without clock stretching or other hardware overhead. Protocol overheads include a target address and perhaps a register address within the target device, as well as per-byte ACK/NACK bits.
ACK and NACK usage [ edit ] There are the following differences in the use of the NACK bus signaling: In I²C, a slave receiver is allowed to not acknowledge the slave address, if for example it's unable to receive because it's performing some real time task.
NACK-oriented multicast communications are susceptible to NACK implosions. If a large number of receivers NACK simultaneously, this could overwhelm the sender as well as the entire network. NORM uses a NACK suppression mechanism, discussed in RFC 5740, Section 5.3, Receiver NACK Procedure, to prevent NACK implosions.
Whenever party A wants to send data to party B, it will carry additional ACK information in the PUSH as well. For example, if A has received 5 bytes from B, with a sequence number starting from 12340 (through 12344), A will place "ACK 12345" as well in the current PUSH packet to inform B it has received the bytes up to sequence number 12344 and ...
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For instance, at 2400 bit/s the packets took only 0.55 seconds to send, so if the <ACK>/<NAK> still took 0.2 seconds to make it back to the user's machine, the efficiency has fallen to 71%. At 9600 bit/s it is just under 40% – more time is spent waiting for the reply than is needed to send the packet.
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