Contemporary-control-systems USB222 Adapters Uživatelský manuál stáhnout pdf (Strana 4)

TD040900-0II

INSTALLATION

SOFTWARE

Driver installation instructions are provided in the readme file located on the

disk that accompanies the product.

INDICATOR LIGHTS

ARCNET: This LED will flash green in response to any ARCNET

activity.

USB: This LED glows green so long as a valid active USB

connection exists to an attached computer.

FIELD CONNECTIONS

The USB22 is available in four models that vary by transceiver type for

connecting to an ARCNET LAN via a particular kind of cable. Each

model’s transceiver is identified by the suffix (-4000, -485, -CXB or -

TB5) separated from the main number by a hyphen.

-CXB Coaxial Bus

Generally two types of coaxial cables are used with ARCNET: RG-62/u

and RG-59/u. RG-62/u is recommended because it matches the 93-ohm -

CXB impedance and can thus achieve the maximum 1000-foot segment

distance. Although RG-59/u does not match the -CXB impedance (it is

75-ohm cable), it will still work but the segment length may be limited.

Never attach coax cable directly to the USB22-CXB; always use the

provided BNC “T” connector. The “T” connector allows the coaxial bus

to continue as shown with device A in Figure 43. Apply the provided

93-ohm BNC terminator to the “T” if the USB22 terminates the coax in an

end-of-line situation as shown with device B in Figure 43.

Figure 4 — Possible Connections for the USB22-CXB

1 2 3 4 5 6 7 8

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Contemporary-control-systems USB222 Adapters Uživatelský manuál Strana 4