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OPERATIONS MANUAL
RS-232 MODEM SHARING DEVICE
Model: MSD-4
4-Port RS-232 Modem Sharing Device
Ordering Part Number: 101012
FOR TECHNICAL SUPPORT CALL:
East Coast Datacom, Inc.
245 Gus Hipp Blvd., STE 300
Rockledge, FL 32955 U.S.A.
TEL: (321) 637-9922
Email: support@ecdata.com
Web Address: www.ecdata.com
Manufactured By
East Coast Datacom, Inc.
:
Publication # 719008 Rev - A
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Table of Contents
Summary of Contents for East Coast Datacom MSD-4
- Page 1 OPERATIONS MANUAL RS-232 MODEM SHARING DEVICE Model: MSD-4 4-Port RS-232 Modem Sharing Device Ordering Part Number: 101012 FOR TECHNICAL SUPPORT CALL: East Coast Datacom, Inc. 245 Gus Hipp Blvd., STE 300 Rockledge, FL 32955 U.S.A. TEL: (321) 637-9922 Email: support@ecdata.com Web Address: www.ecdata.com Manufactured By East Coast Datacom, Inc.
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Page 2: Table Of Contents
RTS/CTS Operation to Sub‐Channel Contention(Hand Shaking) ..................... 6 OR‐MODE Operation (System doesn’t care about RTS or DTR. Any port data gets thru) .......... 6 3.6 MASTER PORT OPTIONS ..................................6 3.7 SUB-CHANNEL PORT OPTIONS ................................. 6 4.0 - APPENDIX ..........................................8 Serial Port Pinouts ..................................... 8 OVERVIEW, MSD-4 FRONT AND REAR VIEWS ..............................9 5.0 – TECHNICAL SPECIFICATIONS ..................................10 ... -
Page 3: Safety Warnings / Avertissements De Sécurité
East Coast Datacom, Inc. WARRANTY NOTICE WARRANTIES: East Coast Datacom, Inc. (hereafter referred to as E.C.D.) warrants that its equipment is free from any defects in materials and workmanship. The warranty period shall be three (3) years from the date of shipment. -
Page 4: Chapter 1 - Introduction
Clocking in both modes of operation is accomplished from the attached Modem. The MSD-4 may also be used in broadcast only applications as ref. in Section 2.6. The MSD-4 incorporate optional Anti-Streaming circuitry. If enabled, Anti-Streaming will automatically remove a defective terminal from service if the Data / Control criteria is present for the user predefined clock selection period. -
Page 5: Theory Of Operation
When one of the DTE devices answers the poll from the host site, that DTE device will raise RTS (Request To Send). When RTS is raised the MSD-4 scanner circuitry will lock on to that port and allow that attached DTE device to communicate with the modem link. The MSD will remain locked onto that port until RTS is dropped and CTS (Clear To Send) is dropped from the modem. -
Page 6: Sub-Channel Contention Modes
2.6 DATA BROADCAST ONLY APPLICATIONS The MSD-4 may be used in Data/Clock Broadcast applications. This can be accomplished by several methods. One: Disable the Front Panel switches and RXD and Clock from the Master Port will always continue outbound to all sub-channels. -
Page 7: Manual Dte Removal
This may be explained by a missing or incorrect Termination Resistor that has been overlooked by your terminal manufacturer. This is the main reason that Anti- Streaming circuitry has been designed into the MSD-4 as well a 22k pull-down resistor is on each sub-channel’s RTS leads, for long unterminated cables. -
Page 8: Power Connection
USER MANUAL, MSD-4, PT# 101012 3.3 POWER CONNECTION Before connecting the MSD-4 to an AC power source the top cover should be installed with the supplied #4-40 screws. AC power is supplied to the MSD-4 via the supplied power cord terminated by a grounded 3-prong plug. Select an appropriate location accessible to and within four to five feet of an AC outlet. -
Page 9: Sub-Channel Contention Modes
USER MANUAL, MSD-4, PT# 101012 3.5 SUB‐CHANNEL CONTENTION MODES To set the MSD-4 to operate in “RTS” or the “OR-MODE”, set as shown below for Jumpers JP11, JP12 & JP13. Move the Pin Header Jumpers located on the printed circuit card. RTS/CTS Operation to Sub‐Channel Contention(Hand Shaking) JP11, Pins 2-3 JP12, JP13 Pins 1-2 Optional: DTR &... - Page 10 USER MANUAL, MSD-4, PT# 101012 OVERVIEW, MSD‐4 PCB & SWITCH SETTINGS Figure 2 ‐ PCB OVERVIEW MSD‐4 P a g e | 7 EAST COAST DATACOM, INC.
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Page 11: Appendix
USER MANUAL, MSD-4, PT# 101012 4.0 - APPENDIX 4.1 Serial Port Pinouts MASTER PORT IS A DTE – Connect to a DCE Pin No. CCITT Circuit Signal Description To DTE To DCE Circuit Name ‐‐‐ ‐‐‐ Shield ‐‐‐ ‐‐‐ Send Data Receive Data Request To Send Clear To Send DCE Ready Signal Ground ‐‐‐ ‐‐‐ Receive Line Detector Send Timing Receive Timing 108.2 Terminal Ready... -
Page 12: Overview, Msd-4 Front And Rear Views
USER MANUAL, MSD-4, PT# 101012 OVERVIEW, MSD-4 FRONT AND REAR VIEWS Figure 3 ‐ FRONT & REAR VIEWS, MSD‐4 P a g e | 9 EAST COAST DATACOM, INC. -
Page 13: Technical Specifications
B) Continental Europe, Part # 713017 MSD‐4 OPTIONAL ACCESSORIES Height ..2.53 inches (6.426 CM) 1) Spare MSD-4 Power Entry Fuses Width ..12.13 inches (30.810 CM) A) 0.160ma Fuse, Qty (2) Part # 714000 Length ..11.13 inches (28.270 CM) B) 0.080ma Fuse, Qty (2) Part # 714001...