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SE-923 Scan Engine Integration Guide
TXD
(Host RXD)
7
RXD
(Host TXD)
3
5
RTS
(Host CTS)
2
6
CTS
(Host RTS)
1
4
1. Host requests permission to send
2. Decoder grants permission
3. Host sends 2 characters of message
4. Host removes request
5. RTS remains low because decoder is still expecting data
6. Decoder times out waiting for a character and removes permission
7. Decoder sends a NAK resend
Figure A-7. Error Transmission: Host Sends Only
First 2 Characters of 6 Character Message
A-14
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