Symbol Technologies LS 3070 ACK/NAK with ENQ

6-14
LS 3070 Product Reference Guide: Programming
When you select the wait for ENQ option, the base station waits for an ENQ,
Enquire character, from the host before it transmits data; otherwise the unit
transmits data without waiting for an ENQ character from the host. With ENQ
enabled, the base station must receive an ENQ from the host within a 2 second
period after the last activity or 4 short beeps are sounded to indicate a
transmission error; the unit is now ready to scan again.
ACK/NAK with ENQ
This combines both handshaking options.
SOFTWARE HANDSHAKING
NO
YES
ACK/NAK SWITCH ON?
NO
YES
YES
YES,
NO
NO 4 LONG BEEPS FINISHED
DATA IS TRANSMITTED.
WAIT FOR ENQ CHARACTER
TO BE RECEIVED FROM HOST
ENQ SWITCH ON?
WAIT FOR ACK OR NAK RESPONSE FROM HOST
NO REPONSE.
AFTER 2 SECONDS, THE UNIT
BEEPS 4 TIMES TO INDICATE
A TRANSMISSION ERROR.
ACK RESPONSE?
TRY 3 TIMES?
SYMBOL IS DECODED
NO REPONSE.
AFTER 2 SECONDS, THE UNIT
BEEPS 4 TIMES TO INDICATE
A TRANSMISSION ERROR.