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Table of Contents

Introduction

Serial Communications Basics

RS232

RS422

RS485

UART Wildcard Hardware

Connecting To Mosaic Controller

Selecting the Module Address

RS422/485 Configuration Jumpers

Protocol Configuration and Direction Control Registers

Modem Handshaking Signals

UART Module Field Header

Cable Connections

Software

Overview of the Software Device Driver Functions

Installing the UART Module Driver Software

Using the Driver Code with C

Using the Driver Code with Forth

UART Direction Control in a Multitasking System

Glossary

Overview of Glossary Notation

Glossary Quick Reference

Glossary Entries

C Demonstration Program (in pdf)

Forth Demonstration Program (in pdf)

Hardware Schematics (in pdf)

UART Wildcard User Guide

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UART Wildcard Field Header

The serial communications signals are brought out to a 24-pin dual row header on the UART Wildcard as shown in Table 1-4.

Table 1-4 UART Wildcard Field Header

UART board: field header

TxD1 and RxD1 are the RS232 transmit and receive signals, respectively, for Channel 1. TxD2 and RxD2 are the RS232 transmit and receive signals for Channel 2.

RCV1+ and RCV1- are the Channel 1 differential RS422/485 receive signals. XMIT1+ and XMIT1- are the Channel 1 differential RS422/485 transmit signals. To implement an RS485 protocol on Channel 1, install the jumper caps on the jumpers labeled "RS485" in the "Port1" jumper area on the UART Wildcard. This connects RCV1+ to XMIT1+, and connects RCV1- to XMIT1- to implement the half-duplex serial link on Channel 1.

RCV2+ and RCV2- are the Channel 2 differential RS422/485 receive signals. XMIT2+ and XMIT2- are the Channel 2 differential RS422/485 transmit signals. To implement an RS485 protocol on Channel 2, install the jumper caps on the jumpers labeled "RS485" in the "Port2" jumper area on the UART Wildcard. This connects RCV2+ to XMIT2+, and connects RCV2- to XMIT2- to implement the half-duplex serial link on Channel 2.

DTR1, DSR1, RTS1, and CTS1 are the optional modem handshaking signals. The DCD1 (data carrier detect) modem signal is shared with RxD2 on pin 18 of the header. The hardware automatically routes this signal to the DCD input on the Channel1 UART if Channel1 is configured for the RS232 modem protocol.

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