PC10420 Serie - PC/104 zu ARCnet Adapter

ARCnet Interface Modules for PC/104 Bus Computers

The PC10420 Series of Network Interface Modules (NIMs) links PC/104 compatible computers with the ARCNET local area network. It uses the COM20020 ARCNET controller chip and has features such as command chaining and an internal 2K x 8 RAM buffer. Bus contention problems are reduced since the module only needs an I/O address. There is no requirement for wait-state arbitration.

Each NIM has two LEDs to monitor network operation and bus access and an 8-bit DIP switch to set the node address — without the need to remove the module.

Seven transceiver options accommodate dipulse and EIA-485 operation and are explained on the next page.EIA-485 considerations: The AC-coupled EIA-485 transceiver offers certain advantages. Signal polarity is of no concern and bias adjustments are unnecessary since each transceiver has its own fixed bias network isolated by a pulse transformer. But DC-coupled technology offers longer distances and will operate over all six data rates. If the software driver you intend to employ will set the COM20020 into backplane mode, you must use the PC10420-485 version

Details zur PC10420 Serie

• No requirement for wait-state arbitration
• Enhanced software capabilities over earlier generation ARCNET controllers
• Node address switch selects one of 255 possible station addresses
• Variable data rates up to 5 Mbps
• Supports coaxial, fibre optic and twisted-pair cabling including EIA-485
• Suitable with all Contemporary Controls hubs
• CMOS design for low-power consumption
• CE Mark
• RoHS
• Utilises COM20020 ARCNET controller
• Interfaces ARCNET with PC/104 bus computers
• I/O-only mapping reduces bus contention problems

Analoge Signale

Coaxial Bus Topology (PC10420-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 (PC10420-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. A -CXS card provides the 93Ω of termination internally.

Twisted-Pair Bus Topology (PC10420-TPB)

A –TPB dipulse transceiver supports up to 8 devices and 122 metres of shielded or unshielded twisted-pair. Apply terminators at each end of the bus.

EIA-485 (Digital) Signale

DC-coupled EIA-485 (PC10420-485 or PC10420-485D)

EIA-485 backplane mode is invoked in the -485 card via user software and in the -485D card via the card’s own hardware. Either card supports 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 (PC10420-485X)

Backplane mode is invoked by the hardware in the -485X card which supports up to 13 devices and a segment length of 213 metres. Apply 120Ω termination at each end of the bus.

Multimode Fibre Optic Signale

ST-connected Duplex Fibre (PC10420-FOG-ST)

Fibre models use the ST style connector to support duplex cable of 50, 62.5 or 100 micron diameter.