SHARP ERA450
Service Manual

2) Up-loading matrix for the host
STATE EVENT ENQ ACK NAK Initial 0 � � � Sends text and goes to 2. � After sending ID ENQ 1 � Sends EOT and goes to 3. Resends the text and then goes to 2. If the host has resent the text two times, it goes to 0. (ERROR END) The host goes to 0. (ERROR END) � Resends the text and then goes to 2. If the host has resent the text two times, it goes to 0. (ERROR END) � After sending text 2 �

EOT TEXT TIME-UP KEY ENTRY

� � � Sends ID ENQ and goes to 1.

� � Resends ID ENQ and then goes to 1. If the host has resent ID ENQ two times, it goes to 0. (ERROR END) �

Time-up: One second after sending of ID ENQ. Four seconds after sending of text. STATE EVENT Sends ACK and goes to 4. ENQ ACK NAK EOT The host goes to 0 (ERROR END) � � � 8 � TEXT TIME-UP KEY ENTRY Time-up: Two second after sending of EOT. After sending EOT 3 After sending ACK 4 After the host has received ENQ, resends ACK and goes to 4. After the host has received TEXT, ignores the ENQ. � � After the host has received TEXT, goes to 0. (Normal end) After the host has received ENQ, goes to 0.(ERROR END) The host checks the text block, if the block is correct, the host sends ACK and goes to 4. If it is not correct, the host sends NAK and goes to 5. If transmission cannot be continued, the host sends EOT and goes to 0. The host goes to 0. (ERROR END) Time-up is 7 seconds � The host goes to 0. (ERROR END) The host checks the checks the text block, if the block is correct, the host sends ACK and goes to 4. If it is not correct, the host sends NAK and goes to 5. If transmission cannot be continued, the host sends EOT and goes to 0. (ERROR END) The host goes to 0. (ERROR END) Time-up is 7 seconds � After sending NAK 5 � � �

�

Resends EOT and goes to 3. If the host has resent the EOT two times, it goes to 0. (ERROR END) �