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rs232 line driver

Features / Benefits

  • Interface - RS-232 and Dedicated 4-Wire
  • Data Rates - Synchronous to 64Kbps
  • DCE/DTE Selectable RS-232 port
  • Point-to-Point or Multi-point Operation up to 32 drops
  • RS232 Line Driver
  • Timing - Internal or External
  • Low EMI - Superior Signal Fidelity
  • Data Carrier Detect (DCD) - Constant or Switched Carrier operation
  • Contention - Selectable for RTS or Data
  • Anti-Streaming - Enable or Disable
  • RTS/CTS - Variable delay settings
  • 110/220VAC switch selectable


The Digital Multidrop Extender (DME) RS-232 line driver utilizes state of the art digital CMOS technology to provide a feature filled product at a very affordable price. The DME transmits and receives data bi-directionally at data rates up to 64kbps. The unit is designed for synchronous Point-to-Point or Multi-point operation.

Applications that benefit from the DME are Polled / Contention networks operating on Switched or Constant Carrier Operation. The DME allows the user to set up a fully digital multipoint network over a campus environment by connecting directly to the back of a CSU/DSU. In this scenario, clocking is provided by the DDS while the DME transmits digital data bi-directionally as the DTE devices are polled from the Host site.

Substantial cost savings are derived by eliminating the need for a Time Division Multiplexer (TDM) or Digital Sharing Device (DSD) behind the CSU/DSU. Additionally, analog Line Drivers are no longer required from the subchannel ports of the TDM or DSD to remote DTE devices.

Installation is fast and simple by setting the internal DCE/DTE switch, Clocking, Constant or Switched Carrier Operation and the Contention Mode of RTS or Data.

The DME provides optional Anti-Streaming circuitry. Once enabled, Anti-Streaming will automatically remove a defective DTE from service if the Data / Control criteria is present for the user defined selection period.

The DME is housed in a sturdy metal enclosure and operates on 110/220VAC.

The DME has a three year warranty and a 24 hour turnaround on warranty repairs.

RS232 line driver application diagram


Application Full Duplex Synchronous Point-to-Point or Multi-point Digital Data Transmission
Capacity Up to 32 drops per site
Interface RS-232 and 4-Wire EMI reduced RS-485
Data Format Dependent on data rate and wire gauge
Data Rates 2.4k to 64Kbps with 3/4 baud rates
Switches DCE/DTE for RS-232 port
RS-232 Physical Interface Female DB-25 Connector
4-Wire Physical Interface (2) RJ-45's and 4-Position Terminal Block
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
Line Requirements Four Wire private, unloaded with no bridge taps
Weight 2 pounds (0.914Kg)
Environmental Operating Temperature . .32º to 122º F (0º to 50º C)

Relative Humidity.. . . . . . .5 to 95% Non-Condensing

Altitude. . . . . . . . . . . . . ... .0 to 10,000 feet

Dimensions Height . . . . . . . . . . . . . . .1.75 inches (4.44cm)

Width . . . . . . . . . . . . . . 7.90 inches (20.07 cm)

Length . . . . . . . . . . . . . . 9.00 inches (22.86 cm)

Weight 2 pounds (0.914Kg)
Warranty Three Years, Return To Factory
Ordering Information Part #: 106000
Model: DME
Description: Digital Multidrop Extender
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 Order


1) Spare Data Center Fuses

....A) 160ma Fuse, Qty (2) Part #714000

....B) 80ma Fuse, Qty (2) Part #71400