Symbol Technologies DS6707 - Manual (Page 89)

SSI Interface 6 - 7
Check Parity
Parameter # 97h
Select whether or not to check the parity of received characters. Use the Parity parameter to select the type of
parity.
Software Handshaking
Parameter # 9Fh
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: When this option is selected, the decoder neither generates nor
expects ACK/NAK handshaking packets.
• Enable ACK/NAK Handshaking: When this option is selected, 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 digital imager 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.
*
Check Parity
(01h)
Do Not Check Parity
(00h)
Disable ACK/NAK
(00h)
*
Enable ACK/NAK
(01h)