Datalogic Hand-held devices II Especificaciones descargar pdf (Pagina 13)

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Networks

Networks work just like several single-user systems connected together to share data These work much like the multi-user

systems shown above, except that each station is able to run any application Networked PCs can run graphics-based and text-

only applications and perform any other MS-DOS or Windows functions The multi-user systems mentioned above will work

with any text-based program

Networks provide this exibility at the expense of cost These systems also require a PC at each station

Developing a Bar Code System Single-User Systems

If you wish to create simple single-user systems, all you need is a wedge reader to connect to your PC If you wish to print on-

demand bar codes, you will also need bar code printing software There are many good products on the market today

Since a wedge reader simulates keyboard input (it connects between the CPU and keyboard), you simply plug it in and scan the

bar code You can improve the reliability of your scans when printing on-demand bar codes by encoding a special character into

the bar codes For example, you could put an “E” at the beginning of employee badge numbers, and a “D” before a department

number Then you can check for this when a eld is read to be sure that the user is not scanning the wrong type of bar code

Multi-user Terminal-Only Systems

While these are still being sold, most companies have discontinued them There is a chance, however, that you already have

one of these in place If that is the case at this point you need decide if you want to replace what you have with PCs or just add

to your existing system It is very easy to add to an existing system, as it is still possible to buy extra terminals and add bar code

equipment to the ones you have

Expansion

Be sure to look at your company’s future as well as its current needs You should plan on expanding virtually every system

you install, because you will denitely see a benet Don’t install a system that you will not be able to expand in the future In

particular, keep these factors in mind:

Extra Terminals or Stations: In about 90 percent of installations, one or two additional workstations are added within the

rst month of installation Try to make it a normal practice to bid the original system with some allowances for expansion

Add a few extra megabytes of RAM to the system and a larger hard drive than you think you need

Wiring: Wire for extra workstations can usually be added when the cabling is pulled with virtually no extra costs Be sure to

pull some extra cables if you can, at least in the more difcult runs

Network Length Limitations: Many networks have a denite length limitation for the total cable making up the network

These limitations are most prevalent on Ethernet networks Don’t select a network that does not allow a few extra

terminals to be added easily

Speed: Do not get the slowest computer you can get away with In most cases you are much better off obtaining better

performance for a little extra money Be sure to use the best disk cache you can, and don’t skimp on RAM

Reliability

Power Supply: In all systems you must ensure that each workstation has a clean and reliable power source In most cases

you can use any convenient power outlet In industrial situations it is always a good idea to add a surge suppressor to the

equipment at installation In manufacturing environments with large equipment, you may need a dedicated power line, an

uninterruptible power supply, or both

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Datalogic Hand-held devices II Especificaciones Pagina 13