Data-Linc Group MDL500/MR Manuale utente

USER GUIDE

NDUSTRIAL

ATA

OMMUNICATIONS

It is essential that all instructions contained in the User Guide are followed precisely to ensure proper operation of equipment.

Two-Wire and Four-Wire

Private Line FSK Modems

Full and Half-Duplex Operation

MDL500/MR

MDL500/LR

DATA-LINC GROUP

PN 161-10003-002B

Product User Guide

DATA-LINC GROUP

MDL500 User Guide

PN 161-10003-002B

rev 8/03

Table of Contents Page

Introduction 3

Transmission 3

RS232 Interface 3

MDL500 Master Unit 3

MDL Remote Units 3

Power Source 4

Operating Modes 4

Installation 4

Field Configuration Procedure 5

Operation 5

Jumper Settings 6

DCE and DTE Settings 6

Trasmitter Output Level 6

Receiver Gain 6

Carrier Detect 7

Chassis Ground 7

Half-Duplex Operation/Carrier Control 7

Special Instructions 8

MDL500/MR/LR Four-Wire Long Range Transmitter & Receiver Jumpers 8

MDL500/MR/LR Four-Wire Long Range Carrier Signal Connectors 8

Front Panel LEDs 8

General Operating Notes 9

Non-Loaded Transmission Line 9

Loop Back Test 9

AE485Interface 9

Technical Specifications 10

Technical Support 11

Product Warranty 11

ReturnMaterialAuthorization 11

Contact Information 11

AppendixA 12

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DATA-LINC GROUP

2PN 161-10003-002B

rev 8/03

MDL500 User Guide

DATA-LINC GROUP

MDL500 User Guide

PN 161-10003-002B

rev 8/03

Introduction

TheData-LincGroupMDL500/MRis atwo-wire privatelinemodem.TheMDL500/MRallows 9600 baud full and half-duplex

RS232data communications over a single dedicated wirepair and acrosssliding contacts. TheMDL500/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/MRparticularly immune to cross-talkand outside noise interference.This provides highlyreliable,continuous data

transmissionoverdistances of several milesin harsh industrial environments.

TheData-LincMDL500/LRis a four-wire private line,longrange9600baud full-duplex modem. In fourwireLRoperation, the

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

Transmission

TheMDL500performsdata communication by converting digitalsignalstomodulatedhigh frequency sine-wave carrier

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

signals.The digitalSpace and Mark (or 0 and 1) are converted in thetransmitter tocarrier signals having two slightly different

frequencieswhichare identified bythereceiver and reconvertedtothe digital signals.TheMDL500s are eitherMasteror

Remoteunits and can beused for eitherpoint-to-point or multi-pointcommunications. The MDL500s areasynchronous serial

datacommunication devices, data ratetransparent from DC to9600 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

TheMDL500connects to the userprovided equipment via anindustry standard, female DB25connectorconforming to the

IEEERS232C standard. The modem can be configuredto function aseither a DCEor DTE interface.

Data-LincGroupprovides cables and/orpinoutsfor connecting theMDL500to a widevarietyof electronic devices.Contact

our technical support staff for cable specifics.

MDL500 Master Units

TheMDL500 Master unittransmitsat 106.5/100 KHz(Space/Mark) and receivesat 156.5/150 KHz.Apluggabletwo 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.

DATA-LINC GROUP

4PN 161-10003-002B

rev 8/03

MDL500 User Guide

Power Source

The MDL500 is powered by nominal 24 volts DC which is supplied to a black barrel jack on the rear panel. The units are

deliveredfrom the factory with 120 VAC to24 DC wall transformers, whichhave a blackplug attached.Anexternal 24 VDC

supply can also be used to power the MDL. The current draw is 250 mA.

Caution: Ensuretheunit is disconnected frompowerbefore removing the cover.

Operating Modes

TheMDL500 can be operatedin either point-to-pointor multi-point polling modes.In point-to-point, themodems can be

operatedinfull-duplex.

For multi-point data communications, the MDL500 can be operated with one Master and up to eight Remote units. The

connected intelligent device controls the transmitter in each Remote unit. The Master unit’s transmitter remains on at all

time; however, only one slave transmitter can be active at any given time. Multi-point systems must e operated in a half-

duplexmode.

Forfourwire MDL500 operation,seethe section onMDL500/MR/LR Four-Wire SpecialInstructions.

Installation

TheMDL500 factory configurationis set for fullor half-duplex point-to-point operationwith P4 inthe B-C position.The Master

andRemote units areboth factory configuredas DCEs (DataCommunications Equipment) with the jumpers on headers P1

and P2 in the B-C position. Data into the DB25 is on pin 2 and data out is on pin 3. (Also see section 5.0, entitled Jumper

Settings.)

Prior to installation, it is important to ensure that the digital devices to be connected to the MDL500/MR units are capable of

communicatingwith each otheras if connectedwith a conventional three-wire RS232 data cable. Oncethis has been

established, the devices can be connected to the MDL500/MR units and RS232 data communications will take place

transparently.

Note: It is important the wire pair to be used for data communications between the MDL500/MR units:

a) Is connected only to those units.

b) Has no branches and no attached inductance, capacitance or resistance.

c) Has no loading coals, filters or any other load.

d) And all connections must be clean and solid.

Note: Since the data line is transformer isolated from the rest of the circuit, neither leg of the data carrying twisted pair

shouldbegrounded.

DATA-LINC GROUP

MDL500 User Guide

PN 161-10003-002B

rev 8/03

Field Configuration Procedure

Thefieldconfigurationprocedure is as follows:

1. Removethe unit’s cover byremoving the fourscrews on top ofthe modem.

2. SettheRemote units foreither full orhalf-duplex operation bypositioning the jumperon header P4,located behind

theDB25 connector.Forfull-duplex operation, the jumper should be inthe B-C position;for half-duplex, multi-point

operation using RTS line carrier control, the jumper should be in theA-B position.

3. Confirm that the jumpers on locations P1 and P2 are in the B-C position.

4. Replace the cover.

5. ConnecttheRS232 communications port of theDataTerminal Equipment (DTE) (PC, PLC,etc.) to theMDL500

unitwithan appropriate cable.

6. Connect the transmission line to the unit at the pluggable terminal block. There is no polarity requirement.

Connect the unit’s power cord to the barrel jack in the rear panel of the modem and plug the modular transformer into a

convenient 120VAC outlet. Plugging the power in will power up the units; there is no “On/Off” switch.

Operation

Point-to-point, full or half-duplex operation is usually conducted with the both the Master and Remote MDL carriers on all the

time. This is achieved by placing the P4 jumper in the B-C position, which causes the MDL to ignore the RTS line.

In half-duplex, multi-drop, operating mode, with the P4 jumper in theA-B position, the RTS line of the intelligent device that a

Remote MDLis connected to (PC, PLC or RTU) is used to control the MDL’s transmitted carrier. When logic low, the carrier

is turned off; when logic high, the carrier is turned on. If the RS232 cable is disconnected, the RTS connection on the MDL is

biased low and the carrier remains off. (If the P4 jumper is in the B-C position, the RTS connection is biased high and the

carrier will stay on.)

Whenproperly configured, the MDL500 is capableof half orfull-duplex data transmission atrates up to 9600 baud.MDL’s

require no settings for data rate and will operate transparently as data is fed to them. They will begin communicating data as

soonas connections aremade and they are powered up.

DATA-LINC GROUP

6PN 161-10003-002B

rev 8/03

MDL500 User Guide

Jumper Settings

Thereare several configuration optionsthat can beselected by jumpers asdescribed below.The jumperpins are internal and

areidentified bylettering onthe circuitboard. Jumperpins are accessed by removing the four retaining screws on the top

coveroftheenclosureandremovingthecover.

Note: The header position locations are described with the MDL board oriented with the LED’s to the left and the

connectors to the right.

DCE and DTE Settings

Boththe MDL500 Masterand Remote unitsare configured at the factory as DCE (Data Communication Equipment)for

connection to DTE (DataTerminal Equipment). APC, PLC or Multiplexer is usually configured as DTE. If either the Master or

Remote DTE/DCE must be changed, this is accomplished by moving the jumpers on blocks “P1” and “P2” which are located

directly behind the DB25 RS232 connector on the rear panel. For example, as delivered, the Master unit P1 and P2 jumpers

are both set in the B-C position (DCE setting). To change to a DTE, move both jumpers to theA-B position. In DTE, data

into the DB25 will be on pin 3 and data out on pin 2.

Transmitter Output Level

TheMDL500 allows theselection of eitherNormal or HighPower (HP) transmitteroutput. The High Power output has six

timesgreaterpeak-to-peak transmitted signalandprovides correspondingly greater signalto noise ratio. HighPower

transmitteroperationis generally preferred inapplications involving sliding contactsorin very noisyEMIenvironments.

However, caution is advised in some cases since High Power carrier signals will result in more cross-talk to adjacent

conductors.

The jumper to select Normal or High Power is located at position TP2. High Power is selected when the jumper is positioned

center to left; Normal output is selected with center to right. When using the HP setting, the receiver gain should be set to

low. (See Receiver Gain below.) The factory setting is Normal, center to right.This header is positioned slightly below the

TOKOCoilmarked“T5.”

Receiver Gain

The MDL500incorporates a receiveramplifier on thecircuit board.Thisamplifier has low,normal andhigh gain settings

configured by a “T” shaped pin block near the center of the circuit board with pins marked “G1,” “G2” and “G3” (the leg of the

“T”). G1/G2 is the high gain setting; G2, the normal medium gain; and G3/G2, the low gain. The units are delivered from the

factory set at normal gain because the transmitter has been factory set at normal output. The low gain setting should be

usedon the receiver wheneverthe high powertransmitter option isselected on the transmitterto avoid onboardcross-talk.

DATA-LINC GROUP

MDL500 User Guide

PN 161-10003-002B

rev 8/03

Carrier Detect

The Carrier Detect signal to the RS232 connector is enabled or disabled by Jumper Matrix P3. The MDL units are shipped

withtheCarrier Detect enabled (jumperon).

Chassis Ground

Chassisground canbe connectedto signalground viaJumper P5.This is generally not recommended.Aseparate chassis

ground wire may be connected to the MDL’s metal enclosure by means of any of the cover mounting screws as desired to

avoida possible shock hazard.

Half-Duplex Operation/Carrier Control

TheMDL500can be operated inmulti-drop/half-duplex mode by controllingthetransmitter’s carrier on/off usingexternal

signals. The most common external carrier control signal is through the RS232 port RTS line (pin 4). Jumper P4,A-B,

selects this line. When an external RTS logic high is asserted, the MDL carrier is turned on, and a logic low or ground,

turns the carrier off. The MDL RTS line is biased low so that if the RS232 cable is disconnected or the external controlling

device is turned off, the carrier will go off. Selecting jumper P4, B-C, turns the transmitter on and blocks RTS carrier control.

TheB-C settingis usedin full-duplexoperation. Usuallyonly theRemote units have their carriers controlled by the devices

they are connected to (settingA-B). The Master unit’s carrier is left on all the time (setting B-C). (There is no interference

sincethe Master andRemote carrier frequenciesare different.) Thefactory setting forboth MDL Mastersand Remotes is

P4,B-C,for full or half-duplex,point-to-pointoperation.

DATA-LINC GROUP

8PN 161-10003-002B

rev 8/03

MDL500 User Guide

MDL500/MR/LR Four-Wire Special Instructions

Thestandardinstruction “MDL500 IndustrialModemHalf and Full-Duplex Versions”areapplicable with the following

modifications:

MDL500/MR/LR Four-Wire Long Range Transmitter & Receiver Jumpers

The transmitter output is set to high by placing the jumper located on the three pin mail header marked “TP2” in the left and

center position (left side on the marking TP2). The receiver gain is set on medium by placing the jumper on the four pin male

header(invertedT-shape)located aboveT5and C35 on the bottom center(markedG2)and pin between R53 andR55.

Note: The header position locations described are with the MDL board oriented with the LED’s to the left, the

connectors to the right.

MDL500/MR/LR Four-Wire Long Range Carrier Signal Connectors

Thefour-wire MDL hasa second I/Oisolation coil and a second two-position pluggable terminalblock for thetransmitted

carrier. Facing the connectors, the pluggable terminal block on the left is the transmitted carrier and the pluggable terminal

block on the right is the received carrier.

Forproper operation, both modemsmust be setto the samefour-wire configuration.

Front Panel LEDs

Thereare four LED’s on the front panel of the MDL. From left toright:

The first diagnostic LED is Carrier Detect. In full-duplex mode, the CD LED must be lighted on both units. In half-duplex

operation with the Master carrier on and the carrier control mode with RS232 cables connected, the CD LED will be lighted

onall RemoteMDL500/MR’s andOFF on the Master MDL500/MR. (The Master CD LED will blink during operation as each

Remote MDL500/MR turns on its carrier to answer back to the Master). If the correct CD LED’s are not ON, a carrier cable

problem is likely.

Assuming that the CD indication is correct, a Loop Back test is recommended as described on the next page.

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