Contemporary Control Systems AI-USB User Manual

AI-USB Series

A Line of ARCNET® Fixed-Port Active Hubs with USB Interface

INSTALLATION GUIDE

INTRODUCTION

The AI-USB Series of hubs work like AI Series hubs, but also
provide computer access via USB. Each device acts as a hub
with three-ports, two external and one internal. The internal
port connects to USB ARCNET adapter circuitry within the
hub. A USB front panel socket gives access to a laptop or
desktop PC.

The AI-USB complies with the USB 2.0 and USB 1.1 standards
to provide fast, convenient access to an ARCNET LAN with no
need of a network interface module in the computer.

The AI-USB can permanently connect to the ARCNET
network as a bus extender while giving a laptop computer
temporary access. Thus, field wiring is undisturbed while a
computer connects to monitor, configure or test the devices on
the ARCNET network. There are coaxial, twisted-pair and
AC- or DC-coupled EIA-485 models.

The internal USB adapter consists of a COM20022 ARCNET
controller and high-speed microcontroller. The 128K bytes of
receiver buffering aids reception of broadcast messages. With
a 480 Mbps USB link, dropped ARCNET packets are rare.

The AI-USB has the same power connectors as the AI Series of
hubs and requires only low-voltage power from either an AC
(8–24 volts) or DC (10–30 volts) source. Approved companion
transformers are available for UL and CE Mark applications.
Provisions exist for redundant power connections. Each unit is
shipped with both panel and DIN-rail mounting hardware and a
disk containing AI-USB software for
USB cable is also provided.

Windows® 2000/XP

. A

SPECIFICATIONS

Electrical

Input voltage: 10–36 volts 8–24 volts
Input power: 7 W 7 VA
Input frequency: N/A 47–63 Hz

DC AC

Environmental

Operating temperature: 0°C to +60°C
Storage temperature: –40°C to +85°C
Humidity: 10% to 95%, non-condensing

ARCNET Data Rates

Table 1 — ARCNET Data Rates

Shipping Weight

1 lb. (.45 kg)

Compatibility

ANSI/ATA 878.1

LED Indicators

Port Activity — green
Recon — yellow
Status — green
USB — green

Regulatory Compliance

CE Mark; CFR 47, Part 15 Class A
UL 508 Listed Device (intended for use with Class 2 circuits)

Connector Pin Assignments (

485 485X
A Line + Line

B Line – Line
SH Shield Shield

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5-pin screw terminal

Figure 1 — 5-pin Screw Terminal

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)

MECHANICAL

Figure 2 — AI-USB Dimensions

Daughter Board Jumper Blocks
for EIA Bias and Termination

Figure 3

DC-Coupled

Figure 4

AC-Coupled

Figure 5 — EIA-485

Data Rate Switch

EIA-485 ROTARY DATA RATE SWITCH

Although the switch in Figure 5 displays stops for only 3 data
rates, every rate in Table 1 has a stop. Count the clicks to
determine the five unlabelled rates. At one stop clockwise past
the 5.00 position, you get 10 Mbps. The next clockwise stop
selects the 78 kbps rate — then 156 kbps, 312 kbps and 625
kbps in turn — until the 1.25 (Mbps) label is reached.

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INSTALLATION

Mounting

The AI-USB is designed for mounting in a wiring closet or an
industrial enclosure using either set of the provided mounting
hardware listed below:

TS-35 DIN Rail Mounting

DIN rail clip
DIN rail clip support bracket
4-40 screws, pan-head (2)

Panel Mounting

Panel mounting bracket
4-40 screws, flat-head (4)

For quick snap-mounting to 35 mm DIN rail, a reinforced DIN
rail clip is pre-attached to the back of the enclosure with two
#4-40 pan-head screws. If the clip is removed, the unit can be
panel-mounted by extending the top and bottom brackets which
are shipped in retracted position. The extended brackets can
then anchor the unit to a wall or other flat vertical surface with
two #8 pan-head screws (not provided). The left illustration of
Figure 6 shows a rear view of the AI-USB with brackets in
retracted position. The right illustration of

Figure 6

shows the
brackets extended and secured to the AI-USB enclosure with
the same screws that were used in the retracted position.

Figure 6 — Using the Panel-Mounting Brackets

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