Wasp Barcode WLS8600 Product Reference Guide - Manual (Page 103)

REFERENCES
4.1.2 ACK/NACK Protocol
WLS8600 Readers
This parameter sets a transmission protocol in which the Host responds to the reader
after every code transmitted. The Host sends an ACK character (06 HEX) in the case
of good reception or the NACK character (15 HEX) requesting re-transmission, in the
case of bad reception.
WLS8600 Host
ACK or NACK
data
cable
ACK/NACK enabled
If the reader does not receive an ACK or NACK, transmission is ended after the
RX Timeout (see par. 4.1.4).
When ACK/NACK protocol is enabled, FIFO must be disabled manually, see par.
4.1.3.
4.1.3 FIFO
This parameter determines whether data (barcodes) are buffered on a First In First
Out basis allowing faster data collection in certain cases for example when using
slow baud rates and/or hardware handshaking.
If the FIFO buffering is enabled, codes are collected and sent out on the serial line in
the order of acquisition. About 800 characters can be collected (buffer full), after
which the reader signals an error and discards any further codes until the
transmission is restored.
If the FIFO buffering is disabled, each code must be transmitted before another one
can be read.
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