Sharp ER-A470 User Manual

2. Transmission control procedure matrix
1) Down-loading matrix for the host
STATE Initial After sending ID ENQ After sending text
EVENT 0 1 2
ENQ — — —
ACK —
Sends text and goes to 2. Sends text and goes to 2.
Sends EOT and then goes to 0.
(Normal end)
NAK — —
Resends the text and then goes to 2.
If the host has resent the text two times, it sends EOT and
goes to 0.
(ERROR END)
EOT — —
The host goes to 0.
(ERROR END)
TEXT — — —
TIME-UP —
Resends ID ENQ and then goes to 1.
If the host has resent ID ENQ two times,it sends EOT and
goes to 0.
(ERROR END)
Resends the text and then goes to 2.
If the host has resent the text two times,it sends EOT and
goes to 0.
(ERROR END)
KEY ENTRY Sends ID ENQ and goes to 1. — —
Time-up: One second after sending of ID ENQ.
Four seconds after sending of text.
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Sharp ER-A470 Specifications

General

Brand	Sharp
Model	ER-A470
Category	Cash Register
Language	English