Micro-Aide LDM-1 standlalone Manuale utente

LIMITED DISTANCE MODEM

USER MANUAL

by MICRO-AIDE CORP.

LIMITED DISTANCE MODEM

USER MANUAL

MICRO-AIDE CORP.

626-915-5502 s[email protected]

Revised: June 16, 2009

A comprehensive document for the following LDM products:

• LDM-1 standlalone

• LDM-1 plug-in

• LDM-16 nest

or by any means without the written permission of MICRO-AIDE Corporation.

The information in this document is subject to change without notice. MICRO-AIDE believes

the information contained in this document to be accurate. However, MICRO-AIDE assumes

no responsibility for any errors or omissions.

Windows, Windows 98 and Windows XP are registered trademarks of Microsoft Corporation.

iii

TABLE OF CONTENTS

CHAPTER 1GENERAL DESCRIPTION

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Revision Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

TxDOT Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CHAPTER 2SETUP AND INSTALLATION

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

LDM-1 Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Network Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Point-to-Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Multi-drop Network . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Accessing the LDM-1 PCB . . . . . . . . . . . . . . . . . . . . . . . . . . .12

User Configured Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Rcv and Xmt Terminations (AX1 and AX2). . . . . . . . . . . . . . . .13

Enable Xmt Channel Busy Detector (AX3) . . . . . . . . . . . . . . . .14

RS-232 Protective Ground (AX5) . . . . . . . . . . . . . . . . . . . . .14

RTS to CTS Delay (SW2) . . . . . . . . . . . . . . . . . . . . . . . . .14

Equalization (SW3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Permanently Asserting the RTS . . . . . . . . . . . . . . . . . . . . . .15

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

LDM-1 Standalone . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

LDM-1 Plug-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

LDM-16 Nest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Attaching the Network Lines. . . . . . . . . . . . . . . . . . . . . . . .17

Connecting to the DTE . . . . . . . . . . . . . . . . . . . . . . . . . .17

CHAPTER 3OPERATION

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Indicators and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

LDM User Manual

Select Mode Pushbutton Switch . . . . . . . . . . . . . . . . . . . . . . 20

Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Test Mode A - Analog test with digital loop back . . . . . . . . . . . . . 22

Test Mode B - Analog loop back with DTE data . . . . . . . . . . . . . 22

Test Mode C - Analog loop back with test data . . . . . . . . . . . . . . 23

CHAPTER 4MAINTENANCE

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

PCB Removal and Insertion . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Jumper and Switch Locations . . . . . . . . . . . . . . . . . . . . . . . . . 26

Trouble-Shooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

APPENDIX ATECHNICAL DATA

LDM-1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

LDM-16 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Transmission Range Specifications. . . . . . . . . . . . . . . . . . . . . . . 30

Recommended Equalizations Settings . . . . . . . . . . . . . . . . . . . . . 31

DB-25 Connector Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

APPENDIX BTXDOT APPLICATIONS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Network Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Point-to-Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Multi-Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

RS-232 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

LCU to LDM-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

PSDM to LDM-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

ADU to LDM-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Test Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

CHAPTER 1

GENERAL DESCRIPTION

INTRODUCTION

MICRO-AIDE’s family of Limited Distance Modem (LDM) products can be

used in a variety of data communications applications. The family consists of

the following products.

•LDM-1 standalone - a complete LDM (photographed on the cover page of

this manual).

•LDM-1 plug-in - functionally identical to the standalone version, it is a

printed circuit board (PCB) that is mounted within the LDM-16 nest.

•LDM-16 nest - a 19" rack-mounted chassis that can be equipped with 1 to

16 LDM-1 plug-in PCBs.

The LDM-1 can be thought of as a device for extending RS-232 communica-

tions over great distances (e.g., thousands of feet). It serves as an interface

between the customer’s Data Terminal Equipment (DTE) and data communi-

cations network. It is designed to be compatible with four-wire, private line

networks. It can be used to facilitate point-to-point and multi-drop network

configurations. Its unique performance characteristics permit data transmis-

sion and reception over distances of many miles. Additionally, the LDM-1 will

operate over a wide temperature range.

LDM User Manual

The LDM-1 is easy to install and operate. Several self-test modes allow the

user to verify its performance and network segment integrity. Light Emitting

Diode (LED) indicators inform the user of all critical functions.

KEY FEATURES

Listed below are just a few of the features associated with MICRO-AIDE’s

family of LDM products.

• Broad transmission range, up to 25 miles, point-to-point, at 4800Baud.

• Data transparent transmission and asynchronous operation.

• Baud rates from 75 to 19,200.

• Supports multi-drop configurations of up to eight LDM-1s. Transmission

distance and data rate performance are not de-rated by adding drop points.

• Standard DB-25 female connector provides simple cabling to any RS-232

device.

• Easy-to-activate analog and digital loop back test modes.

• Includes transmit channel detector to avoid data transmission collisions.

Data contention can be resolved at the LDM-1, not at the DTE.

• Allows full duplex operation on four wires.

• Compact size, LDM-1 standalone footprint is approximately 5" by 8" and

less than 2lbs. in weight.

• LDM-16 nest can be equipped with 1 to 16 LDM-1 plug-in PCBs for appli-

cations requiring multiple network interfaces at a single location.

ABOUT THIS MANUAL

This document is intended to provide the user with comprehensive, easy-to-

read instructions on how to install, set up, operate and maintain all three

LDM products. Wherever possible, step-by-step instructions are listed. In the

event the user has questions about any of the described procedures the user

should contact MICRO-AIDE for assistance.

General Description - About This Manual

MICRO-AIDE Corp.

685 Arrow Grand Circle, Covina, CA 91722

Tel: 626-915-5502 Fax: 626-331-9484

E-mail: [email protected]

The MICRO-AIDE Material Return and Limited Warranty policies can be

found on the inside back cover of this manual.

REVISION LEVEL

This User Manual makes specific reference to Revision D of the LDM-1.

Additionally, this manual is applicable to LDM-1s that have been factory

reworked to the Revision D level. The revision level can be found near the

lower right-hand corner of the LDM-1’s printed circuit board (PCB).

TXDOT APPLICATIONS

The LDM products are frequently used with MICRO-AIDE’s Local Control

Unit (LCU) and other data communications devices throughout the State of

Texas. They have been approved by the Texas Department of Transportation

for use in various highway communications networks. Appendix B includes

information specific to these applications.

LDM User Manual

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