USB22 Serie - USB Kompatibles ARCnet Interface

USB22 Serie - Network Interface Modules for USB Computers

To overcome the inherent non-real-time response of Windows®, Contemporary Controls released the USB22 Series of USB 2.0 to ARCNET adapters. ARCNET’s determinism has been compromised by a PCMCIA adapter because typical operating systems cannot service the devices in a timely fashion, causing lost or missed messages. The USB22 deep memory buffer holds messages until the OS can service the device — so missed messages are rare — even if operating at 10 Mbps (four times the standard ARCNET data rate of 2.5 Mbps).

The Universal Serial Bus (USB) has become a well-known method for connecting either desktop or laptop computers to peripherals because it provides a very high-speed interface (up to 480 Mbps).
Using the COM20022 controller, the USB22 represents the latest ARCNET technology — supporting data rates as high as 10 Mbps. Models exist for most recognized ARCNET physical layers. A high-performance microcontroller handles the transfer of data between ARCNET and USB. The NIM is powered from the USB port on the computer.

This product is compatible with the USB 2.0 standard, for extremely fast and convenient access to an ARCNET network without the need to install a NIM into a computer. Since most modern computers are sold equipped with a USB port, it is only necessary to directly connect between the computer and the USB22. The USB22 also operates with the earlier lower-speed USB 1.1 standard.

The USB22 receives its power from the USB port on the USB computer. It is available in several models that will support DC- or AC-coupled EIA-485, coaxial bus or twisted-pair networks. It is shipped with a CD containing a Windows 2K/XP/Vista/7 compatible DLL and driver, along with a USB cable.

Details zur USB22 Serie

• Send/receive ARCNET packets from USB-connected computer
• Supports coaxial and twisted-pair LANs, including AC- and DC-coupled EIA-485
• Embedded microcontroller provides 128 Kbytes of receiver buffering
• Compatible with the baseband ARCNET network
• Operates with either the USB 1.1 or 2.0 standard
• Incorporates a COM20022 ARCNET controller
• LEDs indicate USB status and port activity
• Powered from a computer USB port
• CE Mark and RoHS compliant

Analoge Signal

Coaxial Bus Topology (USB22-CXB)

Cards with –CXB transceivers accept RG-62/u cable via BNC Tee connectors. Each node presents a high-impedance in both the powered and unpowered states. Apply BNC-style 93Ω terminators to both ends of a bus — which can be up to 305 m long and accommodate up to 8 devices.

Twisted-Pair Bus Topology (USB22-TB5)

Using dual RJ-45 jacks, a -TB5 dipulse transceiver supports up to 8 devices and 122 m of shielded or unshielded twisted-pair cable. Each node presents a high-impedance in both the powered and unpowered states. Apply RJ-45 style 93Ω terminators at each end of the bus.

EIA-485 (Digital) Signale

DC-coupled EIA-485 (USB22-485)

The -485 card enables backplane mode via your software; the -485D uses the card’s own hardware. Both support up to 17 nodes and 274 m of cabling via a 3-terminal screw connector*. Apply 120Ω of termination and proper bias at each end of the bus.

AC-coupled EIA-485 (USB22-4000)

The -4000 card invokes backplane mode via your software for up to 8 nodes and 80 m of cabling using dual RJ-45 jacks. The -485X enables backplane via its hardware for up to 13 devices and a 213 m segment via a 3-terminal screw connector*. Apply 120Ω termination at each end of the bus.

* Dual RJ-45 sockets replace the 3-pin connector if the /J model is specified (see Ordering Information)