EAST COAST DATACOM MSD-4 RS-232 Modem Sharing Device Owner’s Manual
- October 30, 2023
- EAST COAST DATACOM
Table of Contents
EAST COAST DATACOM MSD-4 RS-232 Modem Sharing Device
Product Information
The MSD-4 is a 4-port RS-232 sharing device that allows multiple synchronous or asynchronous DTE devices to operate in a polled environment and share one modem. It features EIA RS-232, CCITT V.24 interface with DB-25 female connectors. The device is protocol transparent at data rates up to 128Kbps and has anti-streaming circuitry that automatically removes a defective terminal from service if the Data/Control criteria are present for the user-predefined selection period. The MSD-4 is housed in a sturdy metal enclosure, has an internal 110/220VAC switch selectable linear power supply, and provides over 100,000 hours of reliable service. The device is surge protected with +/- 15KV ESD protection and has a 3-year warranty with a 24-hour turnaround on warranty repairs.
Features/Benefits:
- Interface – EIA RS-232, CCITT V.24, DB-25 Female Connectors
- Data Rates – Synchronous or Asynchronous up to 64Kbps
- Anti-Streaming – Automatic or Manual for unattended Circuit Restoral
- Individual Subchannel Enable/ Disable Switches
- Visual Indication of Subchannel Activity
- Receive Data – Broadcast to all Subchannels
- Transparent to Data
- Fully Cascadable
- External Clocking
- Sturdy Metal Enclosure
- 110/220VAC Switch Selectable
- +/- 15KV ESD Protection
Specifications:
- Application – Multiple sync/async terminal or DTE devices operating in a polled environment, to share one Modem.
- MTBF – 601,328 Hours Benign Ground, Controlled, Telcordia Issue 1
- Capacity – One to four RS-232 Sync/Async devices
- Data Rates – Up to 64Kbps
- Data Format – Data transparent at all data rates
- Timing – External; from attached Modem
- Handshaking – RTS / CTS OR-MODE (Switch on Data)
- Anti-Streaming – Automatic…Selectable time out intervals Disable……Selectable via dip switch
- Terminal Service Modes – Rotational sequence for equal access Priority Mode Optional
- Front Panel Indicators: Power, CTS, DCD, RXD, TXD Channel Active Enable/Disable of each Sub-channel
- Power Source – 100-120 to 200-220VAC @10%, 50/60Hz, 0.16/0.08A, external 110/220 volt select switch, IEC Power Inlet, (2) 5mm Fuses
- Dimensions MSD-4 Alternate Chassis Height – 2.53 inches (6.426 CM) Width – 12.13 inches (30.810 CM) Length – 11.13 inches (28.270 CM)
- Approvals – EMI Approvals FCC 47CFR, Part 15, Subpart B for conducted emissions from a Class A FCC 47CFR, Part 15, Subpart B for radiated emissions from a Class A Safety Approvals UL 62368 Electric Discharge Approval IEC EN-61000-4-2
- Ordering Information – PT# 101012 Model: MSD-4 Description: 4-Port RS-232 Sharing Device, Standalone PT# 101030 Model: MSD-4 Description: 4-Port RS-232 Sharing Device, 1U Rackmount
Product Usage Instructions
- Connect the MSD-4 device to the modem using the EIA RS-232, CCITT V.24 interface with DB-25 female connectors.
- Connect the synchronous or asynchronous DTE devices to the MSD-4 device using the RS-232 Sync/Async connectors.
- Ensure that the MSD-4 device is powered on and the power indicator is illuminated.
- Enable or disable individual subchannels using the subchannel enable/disable switches located on the front panel of the device.
- Monitor subchannel activity using the visual indication of subchannel activity.
- Utilize external clocking from the attached modem to synchronize data transmission.
- Use anti-streaming circuitry for automatic or manual unattended circuit restoral.
- Rotate service modes for equal access or use priority mode (optional) for terminal service.
FEATURES/BENEFITS
- Interface – EIA RS-232, CCITT V.24, DB-25 Female Connectors
- Data Rates – Synchronous or Asynchronous up to 64Kbps
- Anti-Streaming – Automatic or Manual for unattended Circuit Restoral
- Individual Subchannel Enable/ Disable Switches
- Visual Indication of Subchannel Activity
- Receive Data – Broadcast to all Subchannels
- Transparent to Data
- Fully Cascadable
- External Clocking
- Sturdy Metal Enclosure
- 110/220VAC Switch Selectable
- +/- 15KV ESD Protection
DESCRIPTION
The MSD-4, RS-232 Modem Sharing Device provides the network manager with a cost effective means of expanding existing, leased line polled networks without adding computer ports or communications links. With the MSD-4, up to four terminals can share the same port and communications link using the contention and control protocols normally resident in the host hardware and software. Once installed, system and network efficiency are increased through higher host processor utilization coupled with the significant decrease in idle time between host / terminal traffic sessions.
Ideal for either synchronous or asynchronous network environments, the MSD-4 is protocol transparent at data rates up to 128Kbps. Data arriving at the Master Port is continually broadcast to all Subchannels. The attached terminal device that raises the RTS control signal is automatically given control of the MSD until data transmission is complete. Clocking is accomplished from the attached Modem. The MSD-4 incorporates 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 selection period. Housed in a sturdy metal enclosure and equipped with an internal 110/220VAC switch selectable linear power supply, the MSD-4 will provide in excess of 100,000 hours of reliable service. The MSD-4 have a 3-year warranty and a 24 hour turnaround on warranty repairs.
SPECIFICATIONS
-
Application
Multiple sync/async terminal or DTE devices operating in a polled environment, to share one Modem. -
Capacity
One to four RS-232 Sync/Async devices -
Interface
EIA RS-232, CCITT V.24 using DB-25 female connectors -
Data Rates
Up to 64Kbps -
Data Format
Data transparent at all data rates -
Timing
External; from attached Modem -
Handshaking
- RTS / CTS
- OR-MODE (Switch on Data)
-
Anti-Streaming
Automatic…Selectable time out intervals Disable……Selectable via dip switch -
Terminal Service Modes Rotational sequence for equal access Priority Mode Optional
-
Front Panel
- Indicators: Power, CTS, DCD, RXD, TXD Channel Active
- Switches: Enable/Disable of each Sub-channel
-
Power Source
100-120 to 200-220VAC @10%, 50/60Hz, 0.16/0.08A, external 110/220 volt select switch, IEC Power Inlet, (2) 5mm Fuses -
Dimensions
- MSD-4 Alternate Chassis
- Height ……. 2.53 inches (6.426 CM)
- Width …….. 12.13 inches (30.810 CM)
- Length ……. 11.13 inches (28.270 CM)
-
MSD-4 PT# 101030
- Height ……. 1.75 inches (6.426 CM)
- Width …….. 17.00 inches (43.180 cm)
- Length ……. 11.50 inches (29.210 CM)
-
Weight
6 pounds (2.72Kg) -
MTBF
- 601,328 Hours
- Benign Ground, Controlled, Telcordia Issue 1
-
Approvals
-
EMI Approvals
FCC 47CFR, Part 15, Subpart B for conducted emissions from a Class A -
FCC 47CFR, Part 15, Subpart B for radiated emissions from a Class A
-
-
Safety Approvals
UL 62368 -
Electric Discharge Approval
IEC EN-61000-4-2 -
Environmental Testing Approvals
- Operating Temperature: 50º to 160º F (10º to 60º C)
- Operational Alt.: 0 to 2000 Meters above sea level
- Operational Relative Humidity: 10% to 80%
- Non-Operational Temperature: -30 degC to 70 degC
- Non-Operational Alt.: 0 to 50,000 feet above sea level
-
Ordering Information
- PT# 101012
- Model: MSD-4
- Description: 4-Port RS-232 Sharing Device, Standalone
-
PT# 101030
- Model: MSD-4
- Description: 4-Port RS-232 Sharing Device, 1U Rackmount
-
INCLUDED WITH EACH UNIT:
1. Operations Manual
2. U.S.A. Grounded Power Cord, Part # 713015
3. Optional Power Cords
* **A)** United Kingdom, Part # 713016
* **B)** Continental Europe, Part # 713017
* **C)** Other: Specify Country on Purchase OrderEAST COAST DATACOM, INC.
245 Gus Hipp Boulevard, STE 3 • Rockledge, FL 32955-4812 U.S.A.
TEL: (321) 637-9922
WEB SITE: www.ecdata.com.
FAX: (321) 637-9980