Software Handshaking - Motorola SYMBOL LS7708 Product Reference Manual

RS-232 Auxiliary Port 10-15

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 Handshaking are both enabled, Hardware Handshaking takes precedence.
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 Time-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