Related Manuals for Micro-Aide LDM-1 standlalone
Summary of Contents for Micro-Aide LDM-1 standlalone
- Page 1 I M I T E D I S T A N C E O D E M S E R A N U A L by M ICRO...
- Page 3 I S T A N C E O D E M S E R A N U A L A comprehensive document for the following LDM products: • LDM-1 standlalone • LDM-1 plug-in • LDM-16 nest Revised: June 16, 2009 ICRO 626-915-5502 support@micro-aide.com...
- Page 4 All rights reserved. No part of this document may be reproduced or transmitted in any form 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.
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Page 5: Table Of Contents
Unpacking ........7 LDM-1 Basics ........8 Network Types . - Page 6 RS-232 Cables ....... . . 34 LCU to LDM-1 ......34 PSDM to LDM-1 .
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Page 7: Chapter 1 General Description
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. -
Page 8: Key Features
• Compact size, LDM-1 standalone footprint is approximately 5" by 8" and less than 2 lbs. 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. -
Page 9: Revision Level
EVISION EVEL 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). - Page 10 LDM User Manual OTES...
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Page 11: Chapter 2 Setup And Installation
: Unless otherwise stated, the term LDM-1 will refer to either version of the modem (i.e., LDM-1 standalone and LDM-1 plug-in). : The LDM-1 must be properly configured before it can be put into operation. As the setup procedure requires that the user have access to the LDM-1 PCB, it is advisable that the user complete the setup procedure described herein and then proceed to install the modem. - Page 12 LDM User Manual Figure 1 - LDM-1 Standalone...
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Page 13: Unpacking
NPACKING The LDM-1 standalone and LDM-16 nest are packed in individual containers that are properly sized for the unit. The LDM-1 plug-in PCBs are secured inside the LDM-16 nest. Abundant packing materials are provided to mini- mize mechanical shock to the contents. Before opening the shipping carton inspect the carton for damage. -
Page 14: Ldm-1 Basics
LDM-1 B ASICS The LDM-1 can be thought of as a device that extends the distance that RS-232 serial data can be transmitted and received. It does so over four-wire (i.e., two pair) private line networks. It includes a standard DB-25 female con- nector that allows for direct connection to any DTE device. -
Page 15: Network Types
Equalization, line termination and timer settings are among the various items. Before the LDM-1 can be properly set up the type of net- work that will be used must be understood and selected. The LDM-1 is designed for use in point-to-point and multi-drop networks. -
Page 16: Multi-Drop Network
LDM User Manual Figure 3 - Typical Point-to-Point Network ULTI DROP ETWORK The multi-drop network involves two or more, two-pair cable segments. Each cable segment includes a Xmt and Rcv cable pair. The ends of the cable are connected to a single modem. These modems are also referred to as the near- and far-end modems. - Page 17 Setup and Installation - Network Types • The RTS signal of the master modem can be permanently asserted. Refer to the section entitled “Permanently Asserting the RTS” on page 15. • RTS-CTS flow control must be used by each DTE device connected to a slave modem.
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Page 18: Accessing The Ldm-1 Pcb
LDM User Manual LDM-1 PCB CCESSING THE The various LDM-1 settings are controlled by jumpers and switches. They are located on the LDM-1’s PCB. Only the Equalization (SW3) setting can be accessed externally of the standalone modem. The other settings require that the cover of the standalone unit be removed or that the plug-in PCB be removed from its LDM-16 nest. -
Page 19: Setup
SW2 are satisfactory for use with a point-to-point network. The Equal- ization setting controlled by SW3 may need to be changed as required by the length of cable being used. Figure 5 illustrates the location of each setting on the LDM-1 PCB. Figure 5 - LDM-1 PCB ETUP In the sections that follow a description is provided for each jumper and switch setting. -
Page 20: Enable Xmt Channel Busy Detector (Ax3)
ETECTOR The LDM-1 has a built-in carrier detector for its transmit channel. When enabled, the LDM-1 will not assert its CTS signal until it verifies that a carrier is no longer present at the transmit channel. This feature prevents two modems from attempting to transmit simultaneously. -
Page 21: Permanently Asserting The Rts
For these applications the DTE-to-modem cable must include a jumper between pins 4 (RTS) and 6 (DSR) at the LDM-1 end. This technique will force the modem’s RTS to be constantly asserted. Figure 7 on page 31 illustrates the pin assignments used by the LDM-1’s DB-25 con-... -
Page 22: Ldm-1 Plug-In
The user may find it necessary to install the correct complement of PCBs into the LDM-16 before the nest can be used. LDM-1 plug-in PCBs are installed by unfastening the front cover of the nest, depressing the PCB retainer bar and inserting the PCB into the plastic card guides. -
Page 23: Attaching The Network Lines
100ft. in length. ONNECTING TO THE The LDM-1 can be used with any DTE that utilizes an RS-232 interface. The LDM-1’s operation is asynchronous. It uses the Baud rate selected by the DTE. The DTE connects to the DB-25 female connector located at the modem's rear panel. - Page 24 LDM User Manual OTES...
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Page 25: Chapter 3 Operation
NDICATORS AND ONTROLS The front panel of each LDM-1 includes a set of eight, multi-colored LED indicators. The location of each LED and the Select Mode pushbutton switch is depicted in Figure 1 on page 6. The operational mode and signal status of the modem is conveyed via the LEDs. -
Page 26: Select Mode Pushbutton Switch
WITCH The Select Mode pushbutton switch located at the front panel is used to select the operating mode of the LDM-1. The Normal Mode of operation occurs automatically when the unit is first powered up. By momentarily pressing the Select Mode pushbutton switch, the modem can be advanced from Normal Mode to Test Mode A, Test Mode B, Test Mode C and finally back to Nor- mal Mode. -
Page 27: Normal Mode
Figure 6 - Test Mode Signal Flow ORMAL Normal Mode is automatically selected when the LDM-1 is powered up. The modem will transmit/receive data to/from the network in accordance with the jumper and switch settings selected in the setup procedure. The RS-232 interface will be fully operational. -
Page 28: Test Modea - Analog Test With Digital Loop Back
LDM User Manual A - A NALOG TEST WITH DIGITAL LOOP BACK In Test Mode A the analog signal present at the receive channel is decoded into a digital data signal. The receive data signal is then presented to the modem’s transmitter section. -
Page 29: Test Modec - Analog Loop Back With Test Data
DTE. If a DTE is connected it should display a sequence of U characters (i.e., ASCII code 85). : Test Mode C requires an equalization setting of 1 (i.e., minimum). This completes the chapter on how to operate the LDM-1. The next chapter describes maintenance of the modem. - Page 30 LDM User Manual OTES...
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Page 31: Chapter 4 Maintenance
The PCB inside the standalone version LDM-1 should never be removed from its aluminum case. Internal jumpers and switches are accessible once the top cover is removed. However, access to the user configured settings of the LDM-1 plug-in PCB installed within the LDM-16 nest require removal of the... -
Page 32: Jumper And Switch Locations
PCB's six-position connector. Failure to do so will result in damage to the PCB. • Close the front cover. UMPER AND WITCH OCATIONS Several jumpers and switches are mounted on the LDM-1 PCB. Only SW3, which controls the receive channel Equalization setting, is accessible exter-... -
Page 33: Trouble-Shooting Guide
UIDE The following guide will assist the user in resolving problems that may occur with the operation of the LDM-1. It can be especially helpful when attempt- ing to operate the modem for the first time. Procedures for resolving both local and remote problems are listed. - Page 34 Change Baud rate at DTE to 19,200 Table 4 - Trouble Shooting Guide (Continued) This completes the User Manual for the LDM-1. Two appendices have been provided. They include detailed specifications for each of the LDM products and additional information concerning Texas DOT related applications.
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Page 35: Appendix A Technical Data Ldm-1 Specifications
Power attenuation Capacity: 8 modems total Voltage Internal (1 master, 1 to 7 slave 24 Vac, from MICRO-AIDE sup- modems) DIP Switch (SW2): Selects plied wall mount transformer CTS-to-RTS delay of 8, 16, 32 No transmission range de-rat- Consumption or 64 msec. -
Page 36: Ldm-16 Specifications
Mounts into std. 19" equipment discretion, to any specification rack Width: 10.5" listed herein. Height: 5.4" Power Weight: 20 lbs. with 8 LDM-1 Voltage: 120 Vac, 60 Hz plug-in PCBs Consumption: 40 W with 8 LDM-1 plug-in PCBs RANSMISSION ANGE... -
Page 37: Recommended Equalizations Settings
Table 6 - Equalization Settings vs. Cable Length and Baud Rates DB-25 C ONNECTOR IRING The LDM-1 includes a DB-25 female connector. It provides the RS-232 inter- face to the DTE. The connector is wired as illustrated in Figure 7. Figure 7 - DB-25 Pin Assignments... - Page 38 LDM User Manual OTES...
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Page 39: Appendix B T Xdot Applications
DOT A PPLICATIONS NTRODUCTION The LDM-1 is used in a variety of applications by the Texas Department of Transportation. It is frequently used in conjunction with the MICRO-AIDE Local Control Unit (LCU) and PSDM and ADU modules manufactured by Coastcom. Changeable message signs, vehicle detectors and camera pan-and- tilt systems utilize the LDM-1 to facilitate RS-232 communications. -
Page 40: Multi-Drop
The ADU to LDM-1 cable must be assembled in such a way that the LDM-1 is given a constantly asserted RTS signal. The best way to achieve this is to wire pins 4 and 6 together at the LDM-1 end. This allows the RTS to be con-... -
Page 41: Test Software
Data Set Ready (DSR) signal which is always active. Crossing of the Receive Data and Transmit Data signals must also be performed. This cable is also useful when connecting an LDM-1 to any DTE that does not assert an RTS signal. However, its application is limited to point-to-point network segments. -
Page 42: Test Procedure
2. Connect the PC’s serial comm. port to one end of the serial comm. cable. Connect the other end to the DTE port of the master LDM-1. 3. Connect the Xmt and Rcv + and - pins of each modem to the network cable. - Page 43 TxDOT Applications - Test Software 2. Execute the Configure>Channel Configuration command. A screen similar to the following will be displayed. The Channel Number refers to the number of available comm. ports in the PC. Each of the LCU Numbers must correspond with one and only one LCU thumb wheel setting.
- Page 44 LDM User Manual 4. Execute the Configure>LCU Communication Parameters command. Accept the default parameters as listed below. 5. Execute the Statistics>Reset Statistics File. Execute the Error>Reset Error/Log File command. 6. Execute the Control>Reset All LCUs command. After a brief delay a message will indicate that the reset was successful.
- Page 45 TxDOT Applications - Test Software The test will run continuously until it is stopped by pressing the Esc key. The number of test blocks and errors by type will be reported. Run the test in accordance with the TxDOT acceptance criteria.
- Page 46 LDM User Manual OTES...
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Page 47: Limited Warranty
MICRO-AIDE reserves the right to make a final decision as to the existence of any failures and the cause of such failures. No warranty is made with respect to custom equipment or... - Page 48 ICRO 685 Arrow Grand Circle Covina, CA 91722 Tel: 626-915-5502 Fax: 626-331-9484 E-mail: support@micro-aide.com...
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