Micro-Aide LDM-1 Manual de usuario

LIMITED DISTANCE MODEMUSER MANUALby MICRO-AIDE CORP.

LDM User Manual4USER NOTES

5CHAPTER 2SETUP AND INSTALLATIONINTRODUCTIONThis chapter describes how to properly unpack, set up and install each of the MICRO-AIDE LDM products. Typ

LDM User Manual6Figure 1 - LDM-1 Standalone

Setup and Installation - Unpacking7UNPACKINGThe LDM-1 standalone and LDM-16 nest are packed in individual containers that are properly sized for the u

LDM User Manual8LDM-1 BASICSThe LDM-1 can be thought of as a device that extends the distance that RS-232 serial data can be transmitted and received.

Setup and Installation - Network Types9NETWORK TYPESThe LDM-1 has several options and performance settings that can be config-ured by the user. Equali

LDM User Manual10MULTI-DROP NETWORKThe multi-drop network involves two or more, two-pair cable segments. Each cable segment includes a Xmt and Rcv cab

Setup and Installation - Network Types11• The RTS signal of the master modem can be permanently asserted. Refer to the section entitled “Permanently A

LDM User Manual12ACCESSING THE LDM-1 PCBThe various LDM-1 settings are controlled by jumpers and switches. They are located on the LDM-1’s PCB. Only t

Setup and Installation - Setup13Figure 5 illustrates the location of each setting on the LDM-1 PCB.SETUPIn the sections that follow a description is p

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LDM User Manual14• If two modems are located at an end point in the network only one modem should be terminated.• Never terminate a modem located at a

Setup and Installation - Installation15distinct settings are available. Table 2 details the correspondence between Equalization settings and switch po

LDM User Manual16mounting location. The standalone modem comes equipped with four vibra-tion absorbing rubber feet. It is powered by a 24Vac wall moun

Setup and Installation - Installation17any convenient location in the rack with four screws. Figure 2 on page 7 pro-vides front and rear views of the

LDM User Manual18USER NOTES

19CHAPTER 3OPERATIONINTRODUCTIONThis chapter describes how to operate the LDM-1. An explanation of each LED indicator and use of the Select Mode pushb

LDM User Manual20SELECT MODE PUSHBUTTON SWITCHThe Select Mode pushbutton switch located at the front panel is used to select the operating mode of the

Operation - Operating Modes21NORMAL MODE Normal Mode is automatically selected when the LDM-1 is powered up. The modem will transmit/receive data to/f

LDM User Manual22TEST MODE A - ANALOG TEST WITH DIGITAL LOOP BACKIn Test Mode A the analog signal present at the receive channel is decoded into a dig

Operation - Operating Modes23TEST MODE C - ANALOG LOOP BACK WITH TEST DATATest Mode C also loops the transmit channel’s analog output signal to the in

LIMITED DISTANCE MODEMUSER MANUALMICRO-AIDE CORP.626-915-5502 [email protected]: June 16, 2009A comprehensive document for the followi

LDM User Manual24USER NOTES

25CHAPTER 4MAINTENANCEINTRODUCTIONThe primary purpose of this chapter is to describe the recommended trouble-shooting method to be used with the LDM p

LDM User Manual26PCB. PCB removal should be performed in accordance with the following procedure. Refer to Figure 2 on page 7. Power to the nest can b

Maintenance - Trouble-Shooting Guide27nally. The identity and location of each jumper and switch is illustrated in Figure 5 on page 13.TROUBLE-SHOOTIN

LDM User Manual28This completes the User Manual for the LDM-1. Two appendices have been provided. They include detailed specifications for each of the

29APPENDIX ATECHNICAL DATALDM-1 SPECIFICATIONSPhysicalLength: 8.6"Width: 5.3"Height: 1.9"Weight: 22oz.EnvironmentalStorageTemperature:

LDM User Manual30Line RequirementsType: 4-wireGauge: 19 to 24AWGReceiverDynamic Range-40dBm to 0dBmTermination ImpedanceEnabled: 150OhmDisabled: >4

Technical Data - Recommended Equalizations Settings31RECOMMENDED EQUALIZATIONS SETTINGSThe Equalization settings listed in Table 6 are for approximati

LDM User Manual32USER NOTES

33APPENDIX BTXDOT APPLICATIONSINTRODUCTIONThe LDM-1 is used in a variety of applications by the Texas Department of Transportation. It is frequently u

Copyright © 2007 by MICRO-AIDE CorporationAll rights reserved. No part of this document may be reproduced or transmitted in any form or by any means w

LDM User Manual34ously active state. Refer to the section entitled “Permanently Asserting the RTS” on page 15 for details.MULTI-DROPMulti-drop network

TxDOT Applications - Test Software35trolled by the Data Set Ready (DSR) signal which is always active. Crossing of the Receive Data and Transmit Data

LDM User Manual361. The Rcv and Xmt Termination settings for the near-end (master) and far-end (slave) modems must be set to On. The termination setti

TxDOT Applications - Test Software372. Execute the Configure>Channel Configuration command. A screen similar to the following will be displayed.The

LDM User Manual384. Execute the Configure>LCU Communication Parameters command. Accept the default parameters as listed below.5. Execute the Statis

TxDOT Applications - Test Software39The test will run continuously until it is stopped by pressing the Esc key. The number of test blocks and errors b

LDM User Manual40USER NOTES

Material Return PolicyIn the event the customer identifies a malfunction in any product, call or write MICRO-AIDE and obtain a Return Material Authori

MICRO-AIDE CORP.685 Arrow Grand CircleCovina, CA 91722Tel: 626-915-5502 Fax: 626-331-9484E-mail: [email protected]

iiiTABLE OF CONTENTSCHAPTER 1GENERAL DESCRIPTIONIntroduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LDM User ManualivSelect Mode Pushbutton Switch . . . . . . . . . . . . . . . . . . . . . . 20Operating Modes . . . . . . .

1CHAPTER 1GENERAL DESCRIPTIONINTRODUCTIONMICRO-AIDE’s family of Limited Distance Modem (LDM) products can be used in a variety of data communications

LDM User Manual2The LDM-1 is easy to install and operate. Several self-test modes allow the user to verify its performance and network segment integri

General Description - About This Manual3MICRO-AIDE Corp.685 Arrow Grand Circle, Covina, CA 91722Tel: 626-915-5502 Fax: 626-331-9484E-mail: suppor