Ack/Nack From Host Protocol; Fifo; Rx Timeout - Datalogic TC1100 Reference Manual

5
5.1.2

ACK/NACK from Host Protocol

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.
TC1100
5.1.3

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.
5.1.4

RX Timeout

When the RS232 interface is selected, the Host can be used to configure the device
by sending it command strings (see chapter 3).
This parameter can be used to automatically end data reception from the Host after
the specified period of time.
If no character is received from the Host, after the timeout expires, any incomplete
string (any string not terminated by <CR>) is flushed from the device buffer.
104
data
cable
ACK or NACK
Figure 33 - ACK/NACK Enabled
TC1100
Host