Data-Linc Group MDL500/MR Gebruikershandleiding - Pagina 5

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MDL500 User Guide

Introduction

The Data-Linc Group MDL500/MR is a two-wire private line modem. The MDL500/MR allows 9600 baud full and half-duplex

RS232 data communications over a single dedicated wire pair and across sliding contacts. The MDL500/MR operates using

pure Frequency Shift Key (FSK) at high carrier frequencies (100 KHz, 106.5 KHz to 150 KHz, 156.5 KHz) making the

MDL500/MR particularly immune to cross-talk and outside noise interference. This provides highly reliable, continuous data

transmission over distances of several miles in harsh industrial environments.

The Data-Linc MDL500/LR is a four-wire private line, long range 9600 baud full-duplex modem. In four wire LR operation, the

typical range on 22 gauge communication wire is 8 to 10 miles.

Transmission

The MDL500 performs data communication by converting digital signals to modulated high frequency sine-wave carrier

signals that can be transmitted much longer distances with greater noise immunity on wires than square wave digital

signals. The digital Space and Mark (or 0 and 1) are converted in the transmitter to carrier signals having two slightly different

frequencies which are identified by the receiver and reconverted to the digital signals. The MDL500s are either Master or

Remote units and can be used for either point-to-point or multi-point communications. The MDL500s are asynchronous serial

data communication devices, data rate transparent from DC to 9600 baud.

In multi-drop installations, the modems can be connected in a star or daisy-chained. The master modem can be located at

any of the connection points.

RS232 Interface

The MDL500 connects to the user provided equipment via an industry standard, female DB25 connector conforming to the

IEEE RS232C standard. The modem can be configured to function as either a DCE or DTE interface.

Data-Linc Group provides cables and/or pinouts for connecting the MDL500 to a wide variety of electronic devices. Contact

our technical support staff for cable specifics.

MDL500 Master Units

The MDL500 Master unit transmits at 106.5/100 KHz (Space/Mark) and receives at 156.5/150 KHz. A pluggable two position

terminal block at the back of the unit is used for non-polarized connection to the transmission line.

MDL500 Remote Units

The MDL500 Remote unit transmits at 156.5/150 KHz and receives at 106.5/100 KHz. It has the same data line connector

as the Master unit.

PN 161-10003-002B

DATA-LINC GROUP

rev 8/03