Check Parity - Motorola Symbol PL4507 Integration Manual

6 - 12 Symbol PL4507 Decoder Integration Guide

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.
*Do Not Check Parity
Software Handshaking
Parameter # 9Fh
This parameter offers control of data transmission in addition to the control hardware handshaking offers.
Hardware handshaking is always enabled; you cannot disable it.
•
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 decoder expects
either an ACK or NAK response from the host. The decoder also ACKs or NAKs messages from the host.
The decoder waits up to the programmable Host Serial Response Time-out to receive an ACK or NAK. If the
decoder 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.
Disable ACK/NAK
(00h)
(00h)
Check Parity
(01h)
*Enable ACK/NAK
(01h)