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LS 1000 Product Reference Guide: Chapter 4, Programming the LS 1004
Hardware and Software Handshaking Sequence
HARDWARE HANDSHAKING
UNIT ASSERTS REQUEST-TO-SEND LINE.
HOST RESPONDS BY ASSERTING CLEAR-TO-SEND LINE.
SOFTWARE HANDSHAKING
WAIT FOR ACK OR NAK RESPONSE FROM HOST
NO
WAIT FOR ENQ CHARACTER
TO BE RECEIVED FROM HOST
ACK RESPONSE?
NO
TRY 3 TIMES?
YES
,
4 LONG BEEPS
SYMBOL IS DECODED
RTS AND CTS
HANDSHAKING LINES USED
YES
ENQ SWITCH ON?
YES
DATA IS TRANSMITTED
ACK/NAK SWITCH ON?
YES
NO REPONSE.
AFTER 2 SECONDS, THE UNIT
YES
BEEPS 4 TIMES TO INDICATE
A TRANSMISSION ERROR.
FINISHED
4-37
NO
NO REPONSE.
AFTER 2 SECONDS, THE UNIT
BEEPS 4 TIMES TO INDICATE
A TRANSMISSION ERROR.
NO
NO REPONSE.
AFTER 2 SECONDS, THE UNIT
BEEPS 4 TIMES TO INDICATE
A TRANSMISSION ERROR.
.
NO
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