Bioscrypt Inc. VSTICLASS Manual De Usuario

Document #430-90003-08

© Copyright 2003, Bioscrypt Inc.  All rights reserved.

Capacitance (conductor to

conductor)

<20 pF/ft.

Characteristic Impedance

100 – 120 ohms

Nominal DC resistance

<100 ohms/1000 ft.

Wire gauge

24 AWG stranded

Conductors/Shielding

>2 pair (shielded

optional)

It is often hard to quantify if shielded cable is required in an application or not.

Since the added cost of shielded cable is usually minimal it is worth installing the

first time.
The total length of the communication cable (adding up all of the segments of

the run) must not exceed 4000 ft (1200 m) as outlined in the specification for RS-

485 (see reference 3).
Although the RS-485 specification calls out a maximum cable length of 1200

meters and a maximum baud rate well above that of the Veri-Series reader, a

more conservative system should be configured for no more than 1000 meters

and running at a baud rate of 9600 bits per second.  After the network is

configured and is running in a stable manner, the baud rate can be increased if

faster network communications are desired.

Drops (down leads) to equipment are not recommended, but if required, should

not exceed 10 feet and should use the same cable recommended above.

Ethernet cables should generally be shielded Category 5 or better.  The V-Station

supports only 10Base-T Ethernet.  Therefore, it only makes sense to use cable for