Wasp Bar Code WLS 8400 FZ 用户手册
WLS 8400 Product Reference Guide
6-18
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.
that offered by hardware handshaking. There are five options.
If Software Handshaking and Hardware Handshaking are both enabled, Hardware
Handshaking takes precedence.
Handshaking takes precedence.
None
When this option is selected, data is transmitted immediately. No response is expected from
host.
host.
*
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.
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 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