Data; Tolerances; Common Attributes - Motorola SE955 Integration Manual

A - 2 SE955 Integration Guide

Data

Data refers to a group of characters.

Tolerances

Unless otherwise noted, all numeric figures stated in this document have a tolerance of ± 5%.

Common Attributes

This section describes requirements common to the decoder and the host.
NOTE SIF is a half-duplex communication protocol. To maintain proper communication, the requirements in this
section must be met.
All SIF systems have four signal lines. Two are for handshaking and two are for transmitting and receiving
serial data.
Many communications packages do not properly use the handshaking lines for half duplex communications. If
using a PC communications package such as Windows Terminal, disconnect the hardware handshaking lines
from the interface.
The software application libraries included with the optional SE955 Developer Kit provide code to perform
proper handshaking.
Table A-1 lists the decoder's signal lines, and
Decoder Signal Lines
Table A-1
Signal
TXD
RXD
RTS
CTS
Host Signal Lines
Table A-2
Signal
HOST RXD
HOST TXD
HOST CTS
HOST RTS
Serial data transmit output. Drives the serial data receive input of the host.
Serial data receive input. Driven by the serial data transmit output of the host.
Request-to-send handshaking line (output). See
Clear-to-send handshaking line (input). See
Serial data receive input. Driven by the serial data transmit output of the decoder.
Serial data transmit output. Drives the serial data receive input of the decoder.
Decoder transmit request (input). See
Decoder transmit request granted (output). See
Table A-2 lists the host's signal lines.
Definition
The Decoder on page
The Decoder on page
Definition
The Host on page
The Host on page
A-3.
A-3.
A-4.
A-4.