Software Handshaking; None; Ack/Nak; Enq - Motorola Symbol LS9208 Product Reference Manual

6 - 14 Symbol LS9208/LS9208i Product Reference Guide

Software Handshaking

This parameter offers control of data transmission in addition to, or instead of, the control that hardware
handshaking offers. There are five options.
If software handshaking and hardware handshaking are both enabled, hardware handshaking takes precedence.

None

Select this option to transmit data immediately.
*
None

ACK/NAK

After transmitting data, the scanner expects either an ACK or NAK response from the host. When it receives a
NAK, the scanner transmits the same data again and waits for either an ACK or NAK. After three unsuccessful
attempts to send data after receiving NAKs, 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 receive 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

ENQ

The scanner waits for an ENQ character from the host before transmitting data. If the scanner does not receive an
ENQ within the Host Serial Response Time-out, it issues an error indication and discards the data. The host must
transmit an ENQ character at least every Host Serial Response Time-out to prevent transmission errors.
ENQ