MPL MCDISK-E Manuel utilisateur

MCDISK-E

USER'S MANUAL

PCMCIA/JEIDA CARD READER/WRITER WITH SCSI INTERFACE

The MCDISK-E (Memory Card Disk) is a two slot card reader/writer for PCMCIA/JEIDA compatible memory cards. Two card

slotsallowforsimultaneoususeofmemorycards.TheMCDISK-Ecanhandleawidevarietyofcardsofanysize:SRAM,ROM,

OTP,E(E)PROM,FLASH, I/OandPC-ATA disks.Tointerface thosecardsto thehostequipment ithasan SCSIinterface.The

SCSI interface is widely used for connecting mass storage devices like hard disks to microcomputers.

A memory card can be thought of as an extremely fast disk storage device, because there are no latencies for moving

mechanical parts like read/write heads. In all other aspects however, a disk device and a memory card are much the same.

The MCDISK-E exists in two versions. The first one is equivalent to a 3.5" Floppy drive which can be easily incorporated into

OEM products. The second one is a desktop case with built-in power supply for easy connection to all computers with a SCSI

interface. However, although the reader/writer device is compact and economically priced, no concessions have been made

in its performance. It provides a fully professional yet highly economic solution to demands for data storage in harsh

environment. This makes the MCDISK-E ideal for use in many industrial and business applications with SCSI data input and/

or output.

MEH-10000-003 Rev. H

References :

MCDISK-E-1 Open frame Reader/Writer for JEIDA/PCMCIA Memory Cards +5V / +12VDC

MCDISK-E-5 Desktop case Reader/Writer for JEIDA/PCMCIA Cards 100-240VAC / 50-60 Hz

TECHNICAL FEATURES

• Size and mounting compatible to 3.5" floppy disk drive

(open-frame with 1” height) for MCDISK-E-1

• Desktop case for horizontal or vertical mounting

for MCDISK-E-5

• Interfaces PCMCIA/JEIDA Memory Cards to any system

with a SCSI interface

• Double card slot

• Separate SCSI ID for each slot can be configured

• SRAM, ROM, OTP, E(E)PROM, FLASH and I/O card sup-

port

• PC-ATA disk support

• Card sizes 512 Byte up to 64 MByte (PC-ATA: 4 GByte)

• Powerless card inserting of PCMCIA cards

• Memory card types I, II and III are supported

• Supportsdirectaccess to entire memory card(rawaccess)

• Hybrid card (mixed memory types) and multiple partition

support

• All PCMCIA operations handled automatically by the unit

• Built-insocketandcardservicesfeaturetransparentaccess

to card data for PCMCIA-unaware host systems

• High data security through block check capability

• Local 68HC11 processor

• SCSI-2 interface with a WD 33C93 SCSI controller

• Standard SCSI command set

• Low power consumption, typ. 120mA (no card inserted)

• Fast 2 Mbytes/s transfer rate

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TABLEOFCONTENTS

INTRODUCTION ................................................................................................................................................................... 3

I. ABOUT THIS MANUAL............................................................................................................................................ 3

II. SAFETY PRECAUTIONS AND HANDLING ........................................................................................................... 3

III.EQUIPMENTSAFETY ........................................................................................................................................... 3

1. COMMON FOR ALL MCDISK-E ........................................................................................................................................ 4

1.1COMPATIBILITY ................................................................................................................................................... 4

1.2 OPERATION ......................................................................................................................................................... 4

1.3 PCMCIA CARD TYPES........................................................................................................................................ 4

1.4 CARD HANDLING ............................................................................................................................................... 4

1.4.1 INSERTING A CARD ............................................................................................................................. 4

1.4.2 EJECTING A CARD ............................................................................................................................... 5

1.5 LED INDICATORS ............................................................................................................................................... 5

1.5.1 BASIC INDICATIONS............................................................................................................................. 5

1.5.2 ERROR SIGNALLING............................................................................................................................ 5

1.6 DRIVER SOFTWARE ........................................................................................................................................... 5

2. MCDISK-E-1 OPEN FRAME.............................................................................................................................................. 6

2.1SPECIFICATIONS ................................................................................................................................................ 6

2.1.1 PHYSICAL DIMENSIONS...................................................................................................................... 6

2.2 ELECTROSTATIC DISCHARGE (ESD) PROTECTION...................................................................................... 6

2.3 SET-UP................................................................................................................................................................. 7

2.3.1 SET-UP OVERVIEW .............................................................................................................................. 7

2.3.2 PARTS LOCATIONS .............................................................................................................................. 7

2.4 SCSI ID AND OPTIONAL FEATURES ................................................................................................................. 8

2.4.1 SCSI ID................................................................................................................................................... 8

2.4.2 DUAL SCSI ID FEATURE ...................................................................................................................... 8

2.4.3 OPTIONAL FEATURES ......................................................................................................................... 8

2.5 TERMINATION ..................................................................................................................................................... 8

2.5.1 SCSI BUS TERMINATION ..................................................................................................................... 8

2.5.2 TERMINATOR POWER (TERMPWR) ................................................................................................... 8

2.6 MOUNTING .......................................................................................................................................................... 9

2.6.1 GENERAL HINTS .................................................................................................................................. 9

2.6.2 HARDWARE REQUIRED ...................................................................................................................... 9

2.6.3 MOUNTING THE UNIT........................................................................................................................... 9

2.7 POWER AND SCSI BUS CONNECTION........................................................................................................... 10

2.7.1 SCSI BUS CONNECTION ................................................................................................................... 10

2.7.2 SCSI Chain .......................................................................................................................................... 10

2.7.3 POWER CONNECTION....................................................................................................................... 10

2.8 DC VOLTAGE MONITOR ...................................................................................................................................10

2.9 MECHANICAL DIMENSIONS ............................................................................................................................ 11

3.MCDISK-E-5 DESKTOP VERSION .................................................................................................................................. 12

3.1SPECIFICATIONS .............................................................................................................................................. 12

3.1.1 PHYSICAL DIMENSIONS.................................................................................................................... 12

3.2 RADIO AND TELEVISION INTERFERENCE..................................................................................................... 12

3.3 SET-UP............................................................................................................................................................... 13

3.3.1 SET-UP OVERVIEW ............................................................................................................................ 13

3.3.2 PARTS LOCATIONS ............................................................................................................................ 13

3.3.3 SCSI ID................................................................................................................................................. 13

3.4 TERMINATION ................................................................................................................................................... 13

3.4.1 SCSI BUS TERMINATION ...................................................................................................................13

3.5 OPTIONAL FEATURES...................................................................................................................................... 13

3.6 MECHANICAL DIMENSIONS ............................................................................................................................ 13

DISCLAIMER ....................................................................................................................................................................... 16

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INTRODUCTION

I.ABOUTTHISMANUAL

Thismanualis written foruse bytechnical personnel respon-

sible for integrating the MCDISK-E reader/writer into their

system. The manual assists the installation procedure by

providing the information necessary to handle, configure and

mount the MCDISK-E reader/writer.

The MCDISK-E reader/writer is designed to work with most

host systems which are fitted with an SCSI interface. It is a

simple procedure to set up the unit, nevertheless, before

attemptinganyinstallation,pleaseread throughallapplicable

sections of this manual and follow the instructions herein.

The following publications relate closely to this product and

supply information about PCMCIA and SCSI interface. For

those involved in writing drivers or special applications that

directly interface to the MCDISK-E, a Technical Reference

Manual provides information required to drive the MCDISK-E

on the SCSI command level.

• MCDISK Technical Reference Manual (supplied by MPL

AGor yourlocalMCDISK supplier).TheMCDISK Techni-

cal Reference Manual is also available on the internet

under "http://www.mpl.ch" in PDF format.

• PCMCIA PC Card Standard (July 1993, Release 2.1)

• ANSI SCSI-2 Standard (X3.131-199x, Revision 10h)

II.SAFETYPRECAUTIONSANDHANDLING

For personal safety and safe operation of the MCDISK-E,

follow all safety procedures described here and in other

sections of the manual.

• Powermustberemovedfromthecomputersystembefore

installing (or removing) the MCDISK-E reader/writer to

preventthepossibilityofpersonalinjury(electricalshock!)

and/or damage to the unit.

• Handle the unit carefully, i.e. dropping or mishandling the

read/write unit can cause damage to internal assemblies.

• Read and follow all the instructions and warnings de-

scribed herein.

• Keep the MCDISK away from all sources of liquids, such

as coffee cups, drinking glasses, washing facilities etc.

• Protect the MCDISK from damp or wet weather.

• Keep this manual available for reference.

For your protection and that of your MCDISK disconnect the

power input immediately if any of the following conditions

exists:

• The power input cable has been damaged.

• Something has been spilt onto the case.

• TheMCDISK hasbeen damagedin anyway, e.g.through

dropping.

• The MCDISK has been exposed to excess moisture or

rain.

• You suspect that the unit requires servicing or repair.

WARNING: There are no user-serviceable compo-

nents on the MCDISK-E!

III. EQUIPMENT SAFETY

GreatcareistakenbyMPLthatallit'sproductsarethoroughly

andrigorously testedbeforeleavingthefactory toensure that

they are fully operational and conform to specification. How-

ever, no matter how reliable a product, there is always the

remote possibility that a defect may occur. The occurrence of

a defect on this device may, under certain conditions, cause

a defect to occur in adjoining and/or connected equipment. It

is the users responsibility to ensure that adequate protection

for such equipment is incorporated when installing this

device. MPL accepts no responsibility whatsoever for such

kind of defects, however caused.

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1.COMMON FORALLMCDISK-E

1.1COMPATIBILITY

MCDISK-E operates with various system platforms using

standard driver software. Some host systems do not fully

support MCDISK-E and require special driver software. MPL

AG provides a "Technical Note for MCDISK" that reflects the

actual status of software support for different host systems.

Additionally, this Technical Note lists PCMCIA card type

compatibility tests performed by MPL AG or MCDISK users.

1.2OPERATION

This chapter provides information about the use of the

PCMCIA cards and the LED indicators.

The illustration below identifies the items visible on the front

panel of the MCDISK-E.

Fig.1.2: Front view

1.3PCMCIACARDTYPES

The MCDISK-E has been designed to accept three different

PCMCIA card types:

• Type I: Thickness 3.3 mm, no raised substrate area

• Type II: Thickness5.0mm,48mmwideraisedsubstrate

area

• Type III: Thickness 10.5 mm, 51 mm wide raised

substrate area

Thelowercardslotacceptsallthreetypesofcards.Duetothe

front panel cutout, the upper card slot only accepts type I and

II cards.

TypeIandIIcardscanbeinsertedsimultaneouslyinthelower

and upper slot. Type III cards must be inserted in the lower

slot, likewise occupying the space of the upper slot.

1.4CARDHANDLING

Follow the instructions as described in this section when

inserting and ejecting PCMCIA cards. Refer to Figure 5 to

locate indicated items.

1.4.1INSERTINGACARD

WheninsertingacardintooneofthecardslotsoftheMCDISK-

E, care must be taken to ensure that the card is inserted

correctly. Follow these steps to insert the card:

1. Orientatethememorycardsothattheprintedsurface(e.g.

with manufacturer name/logo) is up and the 68-pin con-

nector points towards the MCDISK-E card slot. Note that

somecardshaveanarrowindicatingdirectionofinsertion.

2. Insert the card into the slot. It should slide easily into the

slot until approx. 15 mm remain exposed and the card

comes to a soft stop. At this point gentle pressure is

required to make the final connection between the

memory card and the card slot connector.

If the card comes to a sudden stop earlier than described

above, do not press any further! Key guides on the card

and in the card slot ensure that the card cannot be fully

inserted (does not reach the connector) when inserted in

the wrong way! Remove the card, check orientation and

try again.

3. When the card is fully inserted a small portion of the card

will remain exposed from the card slot opening. The red

LEDonthefrontoftheMCDISK-Ewillgooffindicatingthat

thecard ispresent.IftheredLEDremains litthen thecard

has not been inserted correctly or cannot be operated by

the MCDISK-E (e.g. bad card type).

WARNING: Do NOT use excessive force to over-

come any resistance when inserting the card. This

should not be necessary and will severely damage

both the card and the MCDISK-E.

Power LED

(green)

Lower card

eject button

Error LED

(red)

Upper card

eject button Access LED

upper slot

Access LED

lower slot

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1.4.2EJECTINGACARD

Each card slot has its own card eject button. The eject button

atthelefthandsideofthecardslotsservestheuppercardslot,

the eject button on the right hand side the lower card slot.

Arrows are printed on the eject buttons that point to the card

slot they serve.

To remove the PCMCIA card push the corresponding eject

button. The card is released from the connector inside and it

may now be pulled free.

CAUTION: Do NOT attempt to pull the card free without first

pressing the card eject button!

Do NOT attempt to remove the card when the yellow LED is

lit (see also next section)!

WARNING: Avoid the situation where foreign objects, dust,

liquids etc. can enter the MCDISK-E through the card slot

opening. This can cause severe damage.

1.5LEDINDICATORS

The MCDISK-E is equipped with four LED indicators. Refer

to Figure 1.2 for the location of the indicators.

1.5.1BASICINDICATIONS

The green LED (upper left hand side) is the power indicator.

It is lit whenever the unit is turned on.

The yellow (right hand side) LEDs are the access indicators

for the upper and lower slot. They are illuminated whenever

anaccess tothememory cardinthe correspondingslot takes

place.

Don’t eject the PCMCIA card when the yellow LED is lit!

The red (left hand side) LED is the status indicator. It is

illuminated when the MCDISK-E is not operable due to one

of the following reasons:

• Thereisnocardinserted.Ifacardisinsertedcorrectly,the

red LED will go off.

• There is a card inserted, but it cannot be accessed by the

MCDISK-E.Sucherrorscanhavevariouscauses:theunit

is attempting to write to a write-protected or read-only

card,unknownI/Ocard,hardwareerroronamemorycard,

etc.

During start-up (power up or SCSI bus reset), the MCDISK-

Eperformssome internalselftests. When everythingisokay,

the red and both yellow indicators will flash twice simultane-

ouslyto indicateproper start-upand properSCSI connection.

1.5.2ERRORSIGNALLING

Incaseofanerror,theredandbothyellowindicatorswillshow

a diagnostic status:

• All three indicators remain unlit: Ensure that the unit is

connected correctly to a powered SCSI bus. Likewise the

unit cannot start-up when the SCSI bus is not or not

correctlyterminated(TERMPWR OK?). If theSCSIbus is

okay and the indicators still remain unlit, there may be a

hardware problem and the unit requires service.

• All three indicators flash only once and then remain unlit:

TheinternalRAMtesthasfailed.Theunitrequiresservice.

• The error LED flashes repeatedly: There is a SCSI hard-

ware problem.

• TheerrorLEDdouble-flashesrepeatedly:Thisindicatesa

severe SCSI bus protocol error that prevents the MC-

DISK from continuing SCSI operation. The MC-DISK

needs to be reset to recover from this error. If the error is

permanent, check SCSI cabling, terminators and SCSI

ID's.

• The error LED triple-flashes repeatedly: The ROM con-

tents are not okay. The unit requires service.

• The LEDs show some other pattern than those listed

above: There is a serious hardware problem, and the unit

needs to be returned to your local MCDISK-E supplier for

repair.

1.6DRIVERSOFTWARE

If your MCDISK supplier has provided a driver software

packagewithyourMCDISK-E,thismustbeloadedonthehost

computer before commencing to work with the MCDISK-E.

Follow the instructions provided with the driver and/or the

procedures laid down for installing software on the host

computer provided in the host computer documentation.

If you have an Internet access you can visit our Web site at

http://www.mpl.ch

There you will find different tools, drivers and additional

documentation especially for MCDISKs.

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2.1SPECIFICATIONS

Performance:

Transfer rate 2.5 MByte/sec

Average throughput

with SRAM card 2.0 MByte/sec

Latency 0 ms

Interfaces:

SCSI standard SCSI-2

SCSI bus connector 50-pin/male ribbon

SCSI bus configuration 8-bit/single-ended

PCMCIA standard Release 2.1

PCMCIA card slots 2

PCMCIA card types Type I - III

Power Requirements (without card):

+5 VDC (+/- 5%) 120 mA

+12 VDC (+/- 5%) depends on card, min. 1mA

OperatingEnvironment:

Temperature 0°C ... 70°C

Extended temp. (opt.) -25°C ... +70°C

Relative humidity

(non-condensing) 10% ... 90%

2.1.1PHYSICALDIMENSIONS

Height 25.4 mm (1.0")

Width 101 mm (4.0")

Lenght 145 mm (5.75")

Front panel thickness 3.0 mm (0.12")

Weight 0.25 kg (0.55 lbs)

2.MCDISK-E-1OPENFRAME 2.2 ELECTROSTATICDISCHARGE(ESD)PROTEC-

TION

Various electrical components within the read/write unit are

sensitive to static and electrostatic discharge (ESD). Even a

non-sensible static discharge can be sufficient to destroy or

degrade a component's operation.

Following the precautions listed below will avoid ESD-

related problems:

• Use a properly installed antistatic pad on your work

surface.

• Wear wrist straps and observe proper ESD grounding

techniques.

• Leavetheunitin its antistatic cover untilyouareprepared

to install it in the system. When it is out of its protective

cover, place the unit on the properly grounded antistatic

work surface pad.

Do not touch any components on the read/write unit.

Handle or touch only the unit chassis.

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2.3SET-UP

This chapter provides the information required to configure

the MCDISK-E reader/writer. It describes the setting of the

SCSI ID, local features and configuring the SCSI termination

characteristics.

If you have any doubts on configuration, contact your

MCDISK-E supplier or an authorized dealer of your host

computer.

WARNING: Before you begin, review and observe

the safety precautions described at the beginning of

this manual to avoid personal injury or damage to

equipment.

2.3.1 SET-UP OVERVIEW

Set-up of MCDISK-E-1 is a step by step procedure:

1. Remove the drive from its packing and place it on an

appropriate antistatic work surface, following the ESD

precautions described in the beginning of this manual.

2. Set the unit’s SCSI ID and optional features.

3. Terminate the SCSI bus if required.

4. Mount the unit in the system (see chapter 2.6).

5. Connect DC power and SCSI bus to the unit (see chapter

2.5).

The default factory settings are as follows:

• SCSI ID = 3

• Parity disabled

• Single SCSI ID

• Full CIS mode

• Termination enabled

• Termpower enabled

Fig. 2.3.2.A: Parts location

Power LED

(green)

Lower card

eject button

Error LED

(red)

Upper card

eject button Access LED

upper slot

Access LED

lower slot

Fig. 2.3.2.B: Front view

2.3.2PARTSLOCATIONS

The following figures show the location of the configuration

jumper, connectors, termination resistors as well as a view of

the front panel with its indicator LEDs.

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J2: SCSI ID and

optional features

J6: Power

connector

J8: SCSI termination

& termination power

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2.4 SCSI ID AND OPTIONAL FEATURES

The configuration jumper (J2, refer to figure 2.3.2.A) selects

the SCSI ID and the optional features SCSI parity and CIS

mode. Note that one jumper position is reserved and must be

left open!

0 SCSI Parity disabled (default)

1 Parity enabled

0 Reserved, leave open!

0 Single SCSI ID

Dual SCSI ID

mode

J2 9

2.4.1 SCSI ID

Each device on the SCSI bus must have a unique SCSI ID

number. The numbers range from 0 .. 7 which allows for a

maximumofeightSCSIdevicesonthebus.Beforesettingthe

SCSI ID for MCDISK-E, an ID must be chosen that is not yet

used by other SCSI devices. Usually, most host computer

systemsalreadyuseSCSIID0(internalSCSIharddiskdrive)

and SCSI ID 7 (host computer itself). Check the documenta-

tion of the host computer and the attached peripheral SCSI

devices to verify the available SCSI ID numbers.

WARNING: Ensure that each SCSI device has a

uniqueSCSI IDnumber.Ifnot,seriouscorruptionof

data and/or failure of the host computer may result!

2.4.2 DUAL SCSI ID FEATURE

Note that this feature is available with Firmware V3.3 and

newer only.

When J2 6-11 is closed, the MCDISK-E provides accessing

each slot through a separate SCSI ID. This is useful for

systems with standard SCSI driver software. When the

Dual

SCSI

feature is selected, the MCDISK-E occupies a second

SCSI ID which is one higher than the SCSI ID selected with

the jumpers (see chapter 2.3.1), but only if the selected ID is

less than 6. If the selected ID is 6 or 7, the

Dual SCSI

feature

is disabled.

Fig. 2.4: Configuration jumper

0 0 Full CIS mode (default)

1 0 Suppress CIS Level 1 writing

0 1 No CIS formatting by default

1 1 No CIS recognition

0 0 0 SCSI ID 0

1 0 0 SCSI ID 1

0 1 0 SCSI ID 2

1 1 0 SCSI ID 3

0 0 1 SCSI ID 4

1 0 1 SCSI ID 5

0 1 1 SCSI ID 6

1 1 1 SCSI ID 7 (Not recommended)

'1' = Jumper installed

'0' = Jumper not installed

2.4.3OPTIONALFEATURES

Two optional features can be configured at J2: SCSI parity

and CIS mode (refer to figure 2.3).

TheSCSIparityconfigurationoftheMCDISK-Eshouldmatch

thatofthehostcomputer.Checkthehostcomputerdocumen-

tation to verify its setting. On delivery, the MCDISK-E’s parity

is disabled which should be OK for most system integrations.

The parity can be enabled by installing a jumper across the

referenced pins.

PCMCIA/JEIDA cards supporting CIS (Card Information

Structure) can be automatically identified by the MCDISK-E.

On delivery, CIS mode 00 (both jumpers not installed) is set

andshouldnotneedtobechanged. Veryspecialapplications

mightrequireadifferentCISmode.Insuchacase,refertothe

corresponding sections in the ‘MCDISK Technical Reference

Manual’ first.

2.5TERMINATION

2.5.1SCSIBUS TERMINATION

Both ends of the SCSI bus cable must be terminated. Gener-

ally,oneendisterminatedatthehostcomputer.Theotherend

must be terminated by the last SCSI device on the SCSI bus.

WARNING: Ensure that no more than two devices

on the SCSI bus are terminated. Otherwise serious

corruption of data and/or damage to the SCSI bus

devices may result!

When the MCDISK-E is the last device on the SCSI bus, it

must be terminated by installing pin 2-3 of jumper J8.

2.5.2TERMINATORPOWER(TERMPWR)

Generally, the host computer is the only device on the SCSI

bus required to provide termination power for the bus. In

special cases like some notebooks it's neccessary to supply

thetermination powerviaaperipheraldevice. Ifthe MCDISK-

E is jumpered correctly, it can be used to supply the termina-

tion power to the SCSI bus.

0 Termination off

1 Termination on

0 External TERMPWR

1 Internal TERMPWR

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2.6MOUNTING

This chapter provides the procedure for mounting and fixing

the read/write unit.

WARNING:Beforecommencing,verifythatthehost

system is switched off and disconnected from the

mains power. Review and observe the safety pre-

cautions described at the beginning of this manual

to avoid personal injury or damage to equipment.

2.6.1GENERALHINTS

Youcan mounttheMCDISK-Einany position.The read/write

unit's placement must permit sufficient airflow to ensure that

it operates within the environmental limits listed in Chapter 1

under 'Specifications'.

Dependinguponyourspecificsystem,youmaywishtoattach

the power and SCSI cable before mounting the unit in the

system. In such a case, read Chapter 2.8 first.

2.6.2HARDWAREREQUIRED

TheMCDISK-E-1 canbe installedin a3.5" bayor anycustom

manufactured support with only four M3 screws. Typically,

screwlengthis6mm,butcanvarydependinguponenclosure

or support thickness.

CAUTION: Ensure that screws used to mount the

read/write unit do not extend beyond the frame into

the PCB cavity, otherwise damage to the PCB may

result.

2.6.3MOUNTINGTHEUNIT

The MCDISK-E is equivalent (in size and mounting) to a

standard 3.5" slim-line floppy disk drive. In most cases, this

simplifies the installation of the read/write unit. To mount the

unit:

• Positionthe unit inthe 3.5" bay(and the enclosurecutout)

and gently move it until the four screw holes are aligned.

• Insert and secure the screws at these locations.

Figure 2.5.2: Active termination

If the MCDISK is the only device with an active termination, it

is recommended to connect it at the end of the chain.

Vcc MCDISK

5.0V

Termination

To SCSI connector

To all 18

SCSI lines

The MCDISK-E contains internal components to provide

Active Termination of the SCSI bus. Compared to Passive

Termination, Active Termination is far less sensitive to

TERMPWR voltage variations, which, amongst other things,

increases data security.

Figure 2.5.2 shows the terminator circuit as used on the

MCDISK-E:

MCDISK-E

High-Tech Made in Switzerland

J3: SCSI

connector J6: Power

connector

+12VGND +5V

2.7POWERANDSCSIBUSCONNECTION

This chapter provides directions for connecting the SCSI bus

cable and the power cable to the MCDISK-E.

WARNING: Before you begin, review and observe

the safety precautions described at the beginning

of this manual to avoid personal injury or damage

to equipment.

2.7.1SCSIBUSCONNECTION

The SCSI bus connector J3 is located at the rear of the unit.

It accepts 50-pin flat ribbon cables with a standard female

connector.WhenconnectingtheSCSIbuscabletoconnector

J3, carefully align both connectors to avoid bending or dam-

aging the connector pins.

Fig. 2.7.1: Rear view

2.7.2 SCSI Chain

The following figure shows a typical SCSI connections.

2.7.3POWERCONNECTION

The MCDISK requires a power input of +5 VDC (+/- 5% , typ.

120mA) and +12VDC (±5%, min. 1mA). When providing

power for the unit, take into account the additional current

consumption of the cards to be used!

The power connector J6 is located at the rear of the unit. This

4-pin keyed connector accepts standard connectors of vari-

ous manufacturers. The pin-out of connector J6 is shown in

Figure 2.7.1.

2.8DCVOLTAGEMONITOR

The MCDISK-E monitors the voltage level of the +5 VDC

supply. The unit resets/runs at the following voltage levels:

4.70 VDC: In power-up, the +5 VDC supply has to rise

above this level, otherwise MCDISK-E stays

reset and will not operate.

4.45 VDC: If the voltage drops below this level, the unit

resets.

Internal HD MCDISK-E SCSI Controller

ID 0 ID 1-6 ID 7

SCSI Bus

Fig. 2.7.2 SCSI chain

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