RS-232 INTERFACE 7 - 21
Software Handshaking
This parameter offers control of the data transmission process in addition to, or instead of, that offered by
hardware handshaking. There are five options.
If Software Handshaking and Hardware Hand
shaking are both enabled, Hardware Handshaking takes
precedence.
Options:
•
*None
•
ACK/NAK
•
ENQ
•
ACK/NAK with ENQ
•
XON/XOFF.
None
When this option is selected, data is transmitted immediately.
*None
ACK/NAK
When this option is selected, after transmitting data, the scanner expects either an ACK or NAK response from
the host. When a NAK is received, the scanner transmits the same data again and waits for either an ACK or
NAK. After three unsuccessful attempts to send data when NAKs are received, the scanner issues an error
indication and discards the data.
The scanner waits up to the programmable Host Serial Response T
ime-out to receive an
ACK or NAK. If the
scanner does not get a response in this time, it issues an error indication and discards the data. There are no
retries when a time-out occurs.
ACK/NAK
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