DS2 Setup Guide

DS2

Termination Dip Switches

The termination dip switches ensure the termination on the serial ports is correct. When connecting

485-Bus, RS-422 and RS-485 serial devices to the unit, it is important that the dip switches are set

as follows:

1 2 3 4 5

Switch Function

1 DM485 Bus

2 Serial 3 RS485 Termination (Tx)

3 Serial 3 RS422 Termination (Rx)

4 Serial 4 RS485 Termination (Tx)

5 Serial 4 RS422 Termination (Rx)

Connecting Storage devices

Images are recorded to the internal hard disk for instant playback and searching by the operator.

The capacity of the internal disk effects the amount of images and time that can be recorded.

For example, a 80GB unit can record for 8 days at default record rates, but a 320GB unit can record

for 31 days at the same record rates.

The internal hard disk is a temporary storage device as the images are constantly being overwritten

after a certain period of time.

If all images need to be kept for longer then external storage is required. The 50-way high density

SCSI-2 port on the rear of the unit is used to connect to external storage devices. The unit can

support multiple external hard disks. To maintain an effective SCSI link, the length of all cabling from

the back of the unit to the last SCSI unit should not exceed 3 metres.

The unit’s operating system will continue to utilise the internal hard disks if the external hard drive

encounters a problem.

There are two types of external storage devices which can be used:

RAID

RAID units contain hard disks which adds to the internal storage, effectively extending the number of

images which can be recorded before being overwritten.

RAID units give protection if a fault occurs. If a disk fails in a RAID the images will continue to record

to another disk in the array. RAID also allows faulty disks to be hot-swapped – replaced whilst the

RAID is powered.

JBOD

JBOD units contain hard disks which adds to the internal storage, effectively extending the number

of images which can be recorded before being overwritten.

Unlike RAID, JBOD units do not offer fault tolerance. Therefore, if a disk fails then the information

held on that disk is lost. The disks in the JBOD are not hot-swapable.

Connecting Multiple external devices

Up to ve external storage devices can be daisy chained from the SCSI port on the rear of the unit.