Jands DD-8 Operating instructions

Brand: Jands

Model: DD-8

Category: Stroboscopes & disco lights

Type: Operating instructions

Jands DD-8 is a high-quality 8-channel opto-isolating data splitter specifically designed for distributing one DMX-512 input signal to eight destinations. It is designed to perform two functions - to isolate faults, and to provide signal amplification where long cable runs are used. When a fault occurs, it is possible to get high voltages in the DMX cabling. Such voltages can propagate along the cable and damage all equipment connected to that cable. The DD-8 is designed to sever the physical link between elements of the DMX system, thereby isolating faults on one line from the rest of the system. The DD-8 is fully protected against internal damage from most such faults. Since these faults can occur in all systems, the DD-8 is equally suitable for all touring, theatre, exhibition and trade show applications. In addition, including the DD-8 in a DMX system makes fault finding relatively simple.

JANDS DD-8

Opto-Isolated DMX Splitter

Operating Manual

Version 2.0

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 2 -

EMC COMPLIANCE

This product is approved for use in Europe and Australia/New Zealand and conforms to the following standards:

European Norms Australian / New Zealand

Standards

EN 50081-1 AS/NZS 4252.1

EN 50082-1 AS/NZS 4251.1

EN 60335-1 AS/NZS 3350.1

To ensure continued compliance with EMC Directive 89/336 and the Australian Radiocommunications Act 1992, use

only high quality data cables with continuous shield, and connectors with conductive backshells. Examples of such

cables are:

DMX: Belden 8102 100% Aluminium foil screen, 65% Copper braid.

JANDS ELECTRONICS PTY LTD 1997

DISCLAIMER

Information contained in this manual is subject to change without notice and does not represent a

commitment on the part of the vendor. JANDS ELECTRONICS P/L shall not be liable for any loss or

damage whatsoever arising from the use of information or any error contained in this manual.

It is recommended that all service and repairs on this product be carried out by JANDS

ELECTRONICS P/L or it’s authorised service agents.

JANDS lighting products must only be used for the purpose they were intended by the manufacturer

and in conjunction with the user manual.

JANDS ELECTRONICS P/L cannot accept any liability whatsoever for any loss or damage caused by

service, maintenance or repair by unauthorised personnel, or by use other than that intended by the

manufacturer.

Manufactured in Australia by:

JANDS ELECTRONICS PTY LTD ACN 001 187 837

(40 KENT RD)

LOCKED BAG 15

MASCOT NSW 1460

AUSTRALIA

PHONE: +61-2-9582-0909

FAX: +61-2-9582-0999

EMAIL: Internet:jandsinfo@jands.com.au

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 3 -

Table of Contents

Table of Contents.................................................................................... 3

1.0 Introduction........................................................................................ 4

2.0 Equipment Description..................................................................... 5

2.1 Physical layout ................................................................................................................ 5

3.0 Getting Started .................................................................................. 6

3.1 Setting the input voltage.................................................................................................. 6

3.2 Connecting power........................................................................................................... 6

3.3 Connecting DMX-512 input............................................................................................ 6

3.4 Connecting DMX-512 outputs ........................................................................................ 6

3.5 Power-up sequence......................................................................................................... 6

4.0 Operating Notes ................................................................................ 7

5.0 Technical Aspects............................................................................. 8

5.1 Circuit Description.......................................................................................................... 8

5.2 Fault Finding Table........................................................................................................11

5.3 Miscellaneous Notes.......................................................................................................11

6.0 Installation.......................................................................................... 12

7.0 Maintenance....................................................................................... 12

8.0 Technical Specifications................................................................... 13

Appendix A Connector Pinouts ............................................................ 14

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 4 -

1.0 Introduction

The JANDS DD-8 is a high quality 8 channel opto-isolating data splitter specifically

designed for distributing one DMX-512 input signal to eight destinations. It is designed

to perform two functions - to isolate faults, and to provide signal amplification where

long cable runs are used.

When a fault occurs, it is possible to get high voltages in the DMX cabling. Such

voltages can propagate along the cable and damage all equipment connected to that

cable. The DD-8 is designed to sever the physical link between elements of the DMX

system, thereby isolating faults on one line from the rest of the system. The DD-8 is fully

protected against internal damage from most such faults. Since these faults can occur in

all systems, the DD-8 is equally suitable for all touring, theatre, exhibition and trade

show applications. In addition, including the DD-8 in a DMX system makes fault finding

relatively simple.

The DD-8 can also be used as a signal amplifier where extremely long cable runs are

necessary, or can be used to drive more than the normal maximum of 32 devices from a

console. It is recommended a DD-8 be used to isolate DMX segments that run to

equipment that is powered from different supplies. Outdoor systems where the console

runs from a separate supply to the dimmers are an example of such systems.

The DD-8 is designed to run from most mains power systems. It will accept an input

voltage from 90 to 130V, or 190 to 265V. The input voltage is set by the user at the

back panel.

The DD-8 is packaged in an all-steel enclosure and is designed to mount in a standard 19

inch rack. The DD-8 occupies one rack space.

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 5 -

2.0 Equipment Description

2.1 Physical layout

1. DMX Input: A standard 5 pin male AXR connector for DMX-512 signal input.

2. DMX LED: This indicator shows the presence of DMX signal.

3. Power LED: This indicator shows when mains power is applied to the DD-8.

4. DMX Outputs: A standard 5 pin AXR connector outputs opto-isolated DMX-512

signal to the DMX-512 receivers. The same signal appears on all eight outputs.

5. Power input: An IEC type inlet socket connects mains power to the DD-8.

6. Fuse: The position of the fuse holder selects the mains input voltage. Refer to Section

3 for details on setting the correct mains input voltage.

FRONT PANEL

BACK PANEL

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 6 -

3.0 Getting Started

3.1 Setting the input voltage

Before applying any power it is important that the DD-8 be configured to match the

incoming mains voltage. The fuse holder is marked with both “240V” and “110V”

markings - the label that is the correct way up indicates which input voltage is selected.

To change the input voltage, lever out the fuse holder with a flat blade screw driver and

rotate it 180 degrees. Swap the fuses and re-insert the fuse holder.

Note that the fuse holder is permanently attached to the socket assembly and can

only be removed about 20mm.

Note also that the rating of the fuse must be changed to match the input voltage.

Refer to the specifications for the correct fuse rating.

3.2 Connecting power

Connect a standard IEC plug and cable to the DD-8 inlet socket. When power is applied

the red POWER LED will light.

NOTE

The DD-8 must be connected to a 3 pin earthed power source. Use of 2 pin (non-

earthed) power sources will reduce the ability of the DD-8 to protect against high

voltage shield faults.

3.3 Connecting DMX-512 input

The DD-8 input signal should conform to the USITT DMX-512 (1990) specification.

The DMX-512 input connects to the INPUT socket on the front panel. The green DMX

LED will light if there is signal present. See Appendix A for connector wiring details.

3.4 Connecting DMX-512 outputs

The DD-8 output signals are an amplified copy of the input signal. Connect the outputs

to the DMX-512 receiving devices as required. See Appendix A for connector wiring

details.

3.5 Power-up sequence

When powering up, a system should be powered up in the order it appears in the DMX-

512 system, starting from the console and proceeding to any splitters or softpatches, and

finally to the dimmers or fixtures. The DD-8 should be powered up in its appropriate

position in the system.

This procedure minimises the risk of producing the lighting equivalent of an audio

“thump” and prevents damage to lamps, dimmers, and other controlled devices.

Use the reverse procedure when powering down.

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 7 -

4.0 Operating Notes

A DD-8 should be connected where its fault protection/isolation or fan out capability can

be most effective. See Figure 4.1 below. Suggested positions include:

1. Between pieces of equipment that run from different power sources. Examples

of different power sources include:

• Stadium type shows where the dimmers are distributed in groups around the

stadium and each group is run from a local sub-board, transformer, or sub

station. In this case a separate DD-8 output should be used to drive separate

dimmer groups via individual cables. If this is not practical then a DD-8

should be placed at each dimmer group, to isolate that group.

• Outdoor shows where the console is run from a different power supply to the

dimmers. In this case the DD-8 should be placed just before the input to the

first receiving device on the line.

2. At the input to a multi-piece equipment rack. If it is necessary to have complete

protection and isolation in a system then each receiving device must be

connected to an individual DD-8 output. If 12 channel dimmers in racks of six

are used, then one DD-8 per rack could isolate all of the dimmer inputs, provide

an isolated output for the next rack’s DD-8, and still have one spare output.

3. To drive a DMX-512 control signal in multiple directions from a centre hub

point. A DD-8 mounted in a truss can be used to provide drive signals for

moving lights in separate segments of the truss.

Fig. 4.1 Typical JANDS DD-8 system configuration

DMX-512 CONTROLLED DEVICES

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 8 -

5.0Technical Aspects

5.1 Circuit Description

The DD-8 copies the incoming DMX-512 signal into eight identical opto-isolated

outputs. A separate power supply is provided for the input and each output to maintain

complete isolation. Refer to Figure 2.1 (over).

The input signal is received by a standard RS485 line receiver (IC1) via protection

components PTC1, PTC2, MOV1, MOV2. Note the input shield is lifted from chassis

via a parallel RC network R1, C1. R4 terminates the incoming DMX line.

The output of IC1 drives the opto-isolator LEDs. These LEDs are arranged in two series

strings of four, and are driven via 20mA current sink transistors Q2 and Q3. The use of

current sinks ensures power supply voltage fluctuations do not affect the opto drive

current.

The receiver output also drives the signal indicator LED L2 via positive edge detector

network C8, R26, R8, D3, transistor driver Q1, and pulse lengthener C5. This circuit will

respond to signals with high repetition rates, and may light in the presence of non DMX

signals.

Eight identical output circuits drive the DMX outputs. The opto-transistor and pull-up

resistor R9 etc drive the DMX line driver directly. The line driver output is protected by

PTC3, PTC4, MOV3, MOV4, etc. The output shields are tied hard to the DD-8 chassis.

The DD-8 uses a custom-wound toroidal power transformer with nine separate but

identical secondary windings. Each winding is used to provide an isolated linear power

supply for one of the output circuits or the input circuit. A polyswitch protects each

output from local overloads.

The primary of the transformer is wound with a combined 240/110V winding, and the

orientation of the mains fuse determines which winding is connected to the mains input.

Note that when the mains voltage is changed, a fuse with the correct rating must be used.

1 2 3 4

4321

Jands Electronics P/L

40 Kent Rd

Mascot NSW 2020

Australia

Ph (02) 9582-0909

25-May-2000

H:\Lab\Dd8\Dd8blok0.sc1

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1/ Voltage selection is at rear fuseholder. Use M205 T500mA fuse for 220 - 240 volts, or M205 T1A fuse for 100 - 120 volts.

2/ The DMX signal pins (pins 2 & 3) are protected against continuous differential and common-mode overvoltages of up to 250 volts

AC.

3/ The DMX input shield (pin 1) is floated from earth by a 47K 1W resistor and 47nF RF bypass capacitor.

4/ The eight DMX output shields (pin 1) are connected directly to chassis.

240V

T500mA

120V

T1A

POWER

INLET

TRANSFMR

120/240V

SUPPLY

PROTECTION OPTO

ISOLATOR

PROTECTION

SUPPLY SUPPLY

PROTECTION

ISOLATOR

OPTO

SUPPLY

PROTECTION

ISOLATOR

OPTO

SUPPLY

PROTECTION

ISOLATOR

OPTO

SIGNAL

POWER

47K

47nF

DMX

INPUT OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 8

DD8 ISOLATED

BLOCK DIAGRAM

DMX SPLITTER

DD8BLOK0 G. HAINES

NOTES:

Sec 1

Pri

Sec 2 Sec 3 Sec 8Sec 9

120v

240v

LED

12345678

87654321

Jands Electronics P/L

40 Kent Rd

Mascot NSW 2020

Australia

Ph (02) 9582-0909 2

5-May-2000 10:52:32

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dmxd3.sch Drawn By:

10uF

PTC2

A870

PTC1

A870

MOV2

1.5KE12CA

MOV1

1.5KE12CA

PTC3

A870

PTC4

A870

MOV3

1.5KE12CA MOV4

1.5KE12CA

R26

10K

1K5

R25

2K2

2K2 D1

BAV21

10uF

DB1

DB101

250mA

BAV21

SIGNAL

1nF

BC337

IC1

75176

RXE030

470uF C3

470uF

Vin

GND

+5V 2

REG1

LM7805CK

BAV21

47nF

100nF

BC337

Vin

GND

+5V 2

REG2

LM7805CK

C12

470uF

RXE030

T1A

DB2

DB101

C11

10uF

100nF C10

100nF

IC2

75176

OPTO1

6N137

OPTO6 OPTO2

OPTO3

OPTO4

OPTO7

OPTO8

BC337

OPTO5

100R

RED

33R

2K2

47K

100nF

P2,3,4,5,6,7,8,9

IC2,3,4,5,6,7,8,9

OPTO1,2,3,4,5,6,7,8

REG2,3,4,5,6,7,8,9

DB2,3,4,5,6,7,8,9

PTC3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18

MOV3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18

C10,C14,C18,C22,C26,C30,C34,C38

C12,C16,C20,C24,C28,C32,C36,C40

C11,C15,C19,C23,C27,C31,C35,C39

C9,C13,C17,C21,C25,C29,C33,C37

R9,R10,R11,R12,R13,R14,R15,R16

Input

Mains

DMX

Input

x8 channels

5pin

Male AXR

AXR1

7,8

AXR2

DMX

OUTPUT

GREEN

9x9v

outputs

5pin AXR

FEMALE

240/110

fuse switchable

PWR

Note: For models with serial numbers below D98xxx

OPTO1 thru 8 = 6N135. R9 thru R16 selected during test

for minimum skew (less than 200nsec).

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 12 -

5.2 Fault Finding Table

Fault Symptom Possible Cause Remedy

No power indication Blown Fuse

Mains disconnected

Ambient temperature too high

Replace fuse

Reconnect

Reduce ambient temperature

No DMX signal indication Input cable fault

DMX source fault

Replace cable

Repair source

No DMX output - One output Faulty output cabling

Faulty receiving equipment

Control channels incorrect

Ambient temperature too high

Faulty DD-8 output

Replace cable

Replace faulty receiver

Check source patch settings

Check receiver address settings

Reduce ambient temperature

Swap cabling to another output

No DMX output - All outputs Faulty input cabling

DMX source fault

Ambient temperature too high

Control channels incorrect

Replace cable

Repair source

Reduce ambient temperature

Check source patch settings

Check receiver address settings

5.3 Miscellaneous Notes

• The protection circuitry will protect the DD-8 DMX line receiver/drivers

against damage from most faults. However it is possible that extremely high

fault voltages or spikes may damage the circuitry. If damage does occur it is

important to re-route or repair the DMX cables as appropriate before re-

powering the unit. Note that the protection circuitry may take up to a minute to

reset after a fault has occurred.

• The internal linear power supplies are protected from faults by polyswitches.

These devices become more sensitive to overload at elevated temperatures, and

when tripped the unit should be switched off to enable them to reset. Allow one

minute for these devices to reset once the power has been removed.

• The DD-8 must be connected to a 3-pin earthed power source. Use of two pin

power sources will reduce the ability of the DD-8 to protect against high

voltage shield faults.

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 13 -

6.0 Installation

The DD-8 is designed for mounting in standard 19 inch equipment racks. Adequate

ventilation should be provided around the top of the chassis, however no blank spaces

are required above or below the DD-8 specifically for ventilation of this device. Note

that such spaces may be necessary to prevent the ambient temperature from rising above

the maximum if other heat producing devices are mounted in the same rack.

No rear mounting is necessary due to the low weight of the unit.

7.0 Maintenance

WARNING

DO NOT ALLOW THE ENTRY OF LIQUIDS OF ANY SORT INTO THE DD-8.

With care, the DD-8 will require little maintenance. If the lexan panels require cleaning,

wipe with a mild detergent on a damp soft cloth.

DO NOT spray liquids onto the panels.

DO NOT use solvents for cleaning the panels.

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 14 -

8.0 Technical Specifications

JANDS DD-8 DMX SPLITTER

SPECIFICATIONS

Mains Supply: 90-130V AC, 190-265V AC, 47-53Hz, fully earthed

Fuse: 110V - 1A, 240V-0.5A , M205 delay type

Power consumption: 50VA maximum

Operating Temperature: 45°C maximum ambient

Inputs: 1

DMX Termination: 100 Ohm

Outputs: 8

Isolation - input to any output: 500VAC

Isolation - between outputs: 500VAC

Protection - between input pins: 250VAC

Protection - from input to earth: 250VAC

Protection - between output pins: 250VAC

Protection - from output to earth: 250VAC

Construction: Zinc plated all-steel chassis

Dimensions: D: 120mm W: 480mm H: 44mm

Weight: 3kg

Physical protection rating: IP20

Rack mounting requirements: 1 x 19” rack space / standard spacing for mounting holes

No ventilation requirements

No blank spaces required between units

Power inlet at rear left (looking from front of unit)

Power access required to replace mains fuse

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 15 -

Appendix A Connector Pinouts

DMX connector pin-outs

No CONNECTION

(DMX IN) CONNECTION

(DMX OUTPUT)

1RC NETWORK TO

CHASSIS CHASSIS

2 IN- OUT-

3 IN+ OUT+

4NC NC

OUTPUT DMX CONNECTOR

INPUT DMX CONNECTOR

MANUAL ENDS

5NC NC

JANDS DD-8 DMX SPLITTER

Revision 2.0 - 5 July 1998 OPERATING MANUAL- 16 -

40 KENT RD

MASCOT NSW 2020

PH: +61-2-9582-0909

FAX: +61-2-9582-0999

email: jandsinfo@jands.com.au

Jands DD-8 Operating instructions

Brand: Jands

Model: DD-8

Category: Stroboscopes & disco lights

Type: Operating instructions

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Jands DD-8 Operating instructions

Jands DD-8 Operating instructions

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