PCI20U Serie - ARCnet PCI Karte

Die PCI20U-4000 von Contemporary Controls ist eine ARCnet Karte.
Die PCI20U-4000 von Contemporary Controls ist eine ARCnet Karte.
Die PCI20U-485 von Contemporary Controls ist eine ARCnet Karte.
Die PCI20U-CXS von Contemporary Controls ist eine ARCnet Karte.
Die PCI20U-TB5 von Contemporary Controls ist eine ARCnet Karte.
Mit den ARCnet Karten der PCI20U Serie können Sie Ihre PCI fähigen Geräte mit einer ARCnet Schnittstelle erweitern. Die Karten erreichen Übertragungsraten von bis zu 10 Mbps und haben somit einen High-Speed zugriff auf die I/O Pins der ARCnet COM20022 Controller.

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PCI20U Serie - ARCnet Karte mit PCI Schnittstelle

The PCI standard requires that plug-in boards use a +3.3 V power source provided by the PC's motherboard, making the +5 power obsolete. In response to this development, Contemporary Controls introduced a universal-voltage PCI ARCNET Network Interface Module (NIM) which is compatible with both +3.3 Volt and older, 5-Volt computers.

The PCI20U product is a drop-in replacement for the PCI20, +5 V PCI card which removes any work needed by the user to migrate to +3.3 V PCI or PCI-X slot motherboards. This demonstrates the company's commitment to ARCNET technology and to their customers' requirements for legacy installations.

PCI-X is an enhancement to the original PCI Local Bus Specification enabling devices to operate at speeds up to 133 MHz. If a PCI20U is installed into a bus capable of PCI-X operation, the clock remains at the 33 MHz frequency—restricting all other devices on that bus to the conventional PCI protocol.

This device incorporates the COM20022 chip. New features include command chaining, sequential access to internal LAN, and duplicate node ID detection. Bus contention problems are minimized since the module's interrupt level and I/O base address are assigned through Plug-and-Play (PnP) operation. There is no requirement for wait-state arbitration.

The PCI20U Series exploits the new features of the COM20022 such as 10 Mbps communications utilizing the various EIA-485 transceiver options. This includes DC-coupled and AC-coupled (transformer) EIA-485 variants. Conventional 2.5 Mbps dipulse signaling is also supported.

The PCI20U module has two LEDs on the board for monitoring network operation and PCI bus access to the module. It is equipped with an 8-position, general-purpose DIP switch which could be used to reassign the ARCNET node address without removing the module. Ultimately, the node address is configured via software so the DIP switch can be used for user-defined functions.

Details zur PCI20U Serie

  • Interfaces ARCNET with PCI and PCI-X bus computers
  • Automatic configuration of I/O and interrupt
  • High-speed I/O access to its ARCNET controller
  • Supports coaxial and twisted-pair cabling including EIA-485
  • CE Mark
  • RoHS compliant
  • Enhanced software capabilities over earlier generation ARCNET controllers
  • Suitable with all Contemporary Controls MOD HUB and AI Series active hubs
  • Variable data rates up to 10 Mbps utilising the various EIA-485 transceiver options

Analoge Signale

Coaxial Bus Topology (PCI20U-CXB)

Cards with –CXB transceivers accept RG-62/u cable via BNC Tee connectors. Each node is a high-impedance in both powered and unpowered states. BNC-style 93Ω terminators must be applied to both ends of a bus segment. The maximum segment length is 305 metres and up to 8 devices can share the segment.

Coaxial Star Topology (PCI20U-CXS)

In a –CXS coaxial star system, devices connect in a point-to-point fashion with RG-62/u coaxial cabling not exceeding 610 metres. If more than two cards share the cabling, a hub is needed — because a -CXS card provides the 93Ω of termination internally.

Twisted-Pair Bus Topology (PCI20U-TB5)

Using dual RJ-45 jacks, a -TB5dipulse transceiver supports up to 8 devices and 122 metres of shielded or unshielded twisted-pair. RJ-45 style 93Ω terminators must be applied at each end of the bus.

EIA-485 (Digital) Signale

DC-coupled EIA-485 (PCI20U-485 or PCI20U-485D)

EIA-485 backplane mode is invoked in the -485card via user software and in the -485D card via the card’s own hardware. Either card uses a 3-terminal screw connector* for twisted-pair up to 274 metres in length and up to 17 nodes. Use proper cable and maintain wiring phase integrity among all nodes. Use 120Ω termination and proper bias at each end of the bus.

AC-coupled EIA-485 (PCI20U-4000 or PCI20U-485X)

EIA-485 backplane mode is invoked in the -4000 card via user software for segments up to 80 meteres in length and up to 8 nodes. Backplane mode is invoked by the hardware in the -485X card which supports up to 13 devices and a segment length of 213 metres. The -4000 card uses dual RJ-45 jacks. The -485X card uses 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).