The Decoder; Transmitting Data - Symbol SE 923 Integration Manual

HOST RXD Serial data receive input. Driven by the serial data transmit output of the decoder.
HOST TXD Serial data transmit output. Drives the serial data receive input of the decoder.
HOST CTS Decoder transmit request (input). See The Host on page A-6.
HOST RTS Decoder transmit request granted (output). See The Host on page A-6.
Figure A-1 shows the decoder and host signal relationships.
Decoder

The Decoder

This section describes the requirements that are specific to the decoder.

Transmitting Data

When the decoder needs to send information, it must first check the CTS line to see if the host
is trying to transmit.
Once the bus is available, the decoder may transmit. The decoder is responsible for:
• any programmed intercharacter delays
• retrying if the host communicates during decoder transmission.
Table A-2. . Host Signal Lines
TXD
RXD
RTS
CTS
Figure A-1. Decoder and Host Signals
Serial Interface Specification
Host RXD
Host TXD
Host CTS
Host RTS
Host
A-3