Proxima-asa STH-MD1/-C Manuel d'utilisateur télécharger pdf (Page 10)

STH-MD1 USER’S MANUAL ?2001 VIDERE DESIGN

5 1394 Interface

Digital image information is transferred from the STH-MD1/-C to the host

PC via a 1394 cable. The cable sends a video stream from the imagers to

the PC, and sends commands from the PC to the stereo head to control

exposure, subsampling, etc. The cable also supplies power to the stereo

head.

5.1 1394 Cable

The STH-MD1/-C must be connected to the host PC via a 6-pin male-male

IEEE 1394 cable. The maximum length for such a cable is 4.5 m (about

15 feet). The cable supplies both signals and power to the stereo head.

Use only one cable! The two ports on the MEGA-D are for daisy-chaining

additional devices onto the IEEE 1394 bus.

The distance between the stereo head and the PC can be extended by using

a 1394 repeater.

Several 1394-enabled devices can be connected together, as long as the

connection topology doesn’t have any loops. The STH-MD1/-C can be

connected at any point in such a topology. At a maximum, it will need

about 60% of the bandwidth of a 400 MBps connection.

5.2 1394 Host Interface

The host computer must have an available 1394 port. Some portables and

desktops come with built-in ports. If these are 6-pin ports, they can be

connected directly to the STH-MD1/-C. Sony laptops also support an

alternative 4-pin 1394 cabling, which has the signal pins but no power.

There are adapters that convert from 4-pin to 6-pin styles; these adapters

use an external power supply transformer.

If the host PC doesn’t have a built-in 1394 port, one can be added by

installing a 1394 PCI card or PCMCIA card for laptops. 1394 PCI cards

have 6-pin ports, and supply power. PCMCIA cards do not have the

capability of supplying power, and come with an adapter for supplying

power to the 1394 cable through a wall transformer.

Any 1394 card is suitable, as long as it conforms to OHCI (open host

controller interface) specifications. All current cards do, but some older

cards may not.

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Proxima-asa STH-MD1/-C Manuel d'utilisateur Page 10