Micropack VTP4 Technical Manual

VTP4

Balanced Line To BNC

VIDEO CONVERTER

TECHNICAL MANUAL

Ref: 2200.5005

micropack.co.uk

HELP US TO HELP YOU

Every effort has been made to ensure the accuracy in the contents of our documents; however,
Micropack (Engineering) Ltd can assume no responsibility for any errors or omissions in our
documents or their consequences.

Micropack (Engineering) Ltd would greatly appreciate being informed of any errors or omissions
that may be found in our documents. To this end we include a form, given in Appendix B, for you
to photocopy, complete and return to us so that we take the appropriate action. Thank you.

CONTENTS

TABLE

OF

This document is strictly private and confidential, reproduction without Micropack approval is prohibited. © Micropack Engineering Ltd, 2015

1

Introduction

4

1.1

Overview

4

1.2

Coaxial Video outputs

5

1.3

Led Indications

5 1.4

Balanced Line Video Input

5

2

Safety Instructions

6

2.1

Warnings

6

2.2

Cautions

6

2.3

Important Safety Notices

6

3

Installation

7

3.1

VTP4 Mounting

7

3.2

Mechanical Installation

8

3.3

Field Terminations

8

3.4

Electrical Installation

9

4

Maintenance & Testing

9

VTP4 – Balanced Line To BNC Video Converter

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Rev: 4.0

micropack.co.uk

5

System Design Guidelines

10

5.1

Power Supply

10

5.2

Balanced Line Video (twisted pair) Input

10

5.3

Video (Coaxial) Output

10

5.4

Earthing & Screening Requirements

10

5.5

Coaxial Video Cable Selection

11

5.6

Balanced Line Video (Twisted Pair) Cable Selection

11

6

Fault Finding

12

6.1

Live Video Images

12

6.2

Replacement and Repair

12

7

Technical Specification

13

7.1

Electrical Specification

13

7.2

Mechanical Specification

13

7.3

Environmental Specification

13

7.4

Certification and Approvals

13

Appendix A

Help us to help you

14

VTP4 – Balanced Line To BNC Video Converter

3

Ref 2200.5005

Rev: 4.0

1

Introduction

The Micropack Balanced Line to BNC Video Converter (VTP4 p/n 3100.0010) is used to
convert between Micropack’s Video System twisted pair video cabling (balanced line) and
standard 75R coaxial cabling (BNC) found in commercial video equipment.

The converter has four independent channels. The converter is powered from an
industrial standard 24V supply. The converter has been designed specifically to meet the
needs of an industrial application.

1.1

Overview

The converter is a single board measuring 100 Length x 70 width (mm). With DIN Rail Mounting
Connection to equipment is via standard BNC female connectors. Connection to the video

system twisted pair cabling is via screw terminals.
below:

The key elements of the converter are shown

Figure 1: Converter Overview

1

2

3

Ch 1

Power Connector

Coaxial Video Output
(BNC) x 4

4

5

Ch 2

Ch 1

Status Indication LED

Balanced Line
Video Input x 4

6

7

Ch 2

Ch 3

8

9

Ch 3

Ch 4

10

11

Ch 4

This document is strictly private and confidential, reproduction without Micropack approval is prohibited. © Micropack Engineering Ltd, 2015

VTP4 – Balanced Line To BNC Video Converter

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1.2

Coaxial Video outputs

The converters four BNC outputs each support standard 75R coaxial video cabling.

1.3

Led Indications

The LED indicator is used to reveal its current state, as shown below:

Table 1: LED Status Diagnostic Chart

1.4

Balanced Line Video Input

The converters’ four inputs each support balanced line video using a simple twisted pair cable,
note the converter is a balanced line receiver and a coaxial driver. Between two and six balanced
line video devices can be connected to a single transmission line with no spurs or loops. The
connection of balanced line video is very similar to RS485 communications as shown below:

Figure 2: Balanced Line Video

The intended transmission line is a single 150R twisted pair line terminated at both ends in its
characteristic impedance (i.e. 150R line termination resistors fitted at both ends). Only certain
detectors and video switchers have a multi-drop output capability, refer to the relevant technical
manuals for details.

micropack.co.uk

Green LED

Device Condition

Comment

ON

Healthy - Data Transmission in progress

OK

OFF

Power Failed

Check power distribution

VTP4 – Balanced Line To BNC Video Converter

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