Motorola DS6707 ユーザーズマニュアル

SSI Interface

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Select whether or not to check the parity of received characters. Use the Parity parameter to select the type of 
parity.

This parameter offers control of the data transmission process in addition to that offered by hardware handshaking. 
Hardware handshaking is always enabled and cannot be disabled by the user.

• Disable ACK/NAK Handshaking: If you select this option, the decoder neither generates nor expects 

ACK/NAK handshaking packets.

• Enable ACK/NAK Handshaking: If you select this option, after transmitting data, the digital imager scanner 

expects either an ACK or NAK response from the host. The digital imager scanner also ACKs or NAKs 
messages from the host. 

The digital imager scanner waits up to the programmable Host Serial Response Time-out to receive an ACK 
or NAK. If the scanner does not get a response in this time, it resends its data up to two times before 
discarding the data and declaring a transmit error.