Symbol Technologies P470 - Manual (Page 161)

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Parameter Menus
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 cradle expects either an ACK,
Acknowledge, or NAK, Negative Acknowledge, response from the host. Whenever a NAK
is received, the cradle 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 cradle issues
an error indication and discards the data.
The cradle waits up to the programmable Host Serial Response Time-out to receive an
ACK or NAK. If the cradle 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