PC10422 Series


  • Utilizes COM20022 ARCNET® controller
  • Interfaces ARCNET with PC/104™ bus computers
  • Zero wait-state arbitration typical
  • Enhanced software capabilities over earlier generation ARCNET controllers
  • Supports coaxial and twisted-pair cabling including EIA-485
  • Command chaining for enhanced performance
  • Node address switch selects one of 255 possible station addresses
  • Variable data rates up to 10 Mbps
  • Suitable with all Contemporary Controls' MOD HUB and AI Series active hubs
  • CMOS design for low-power consumption

Product Overview

Just like the PC10420 Series of Network Interface Modules (NIMs), the PC10422 Series enables ARCNET connectivity for PC/104 compatible computers. However, this series is designed with the more advanced ARCNET controller chip which is the COM20022.

The COM20022 controller chip has benefits such as command chaining, sequential access to internal RAM, and duplicate node ID detection. Bus contention problems are decreased since the module only requires an I/O address. There is no requirement for wait-state arbitration. The +5 V only operation reduces system cost by eliminating multiple-voltage power sources.

Two LEDs on the module's board monitor network operation and bus access to the module. The PC10422 is equipped with an eight-position, general-purpose DIP switch used to assign the ARCNET node address without removing the module. The node address can be configured via software—in which case the DIP switch could register user-defined functions such as data rate, cable interface, or master/slave status of the PC/104 system.

The PC10422 is available with flexible cabling options. The PC10422-CXS supports coaxial star configurations requiring external active or passive hubs. The PC10422-CXB accommodates a coaxial bus configuration that requires no hubs since multiple modules can communicate over a single coaxial segment. Similarly, the PC10422-TPB supports twisted-pair bus cabling using either RJ-11 or screw terminal connectors.

This series also accommodates three separate EIA-485 physical-layer implementations. The PC10422-485D supports the EIA-485 DC-coupled cabling standard while the PC10422-485X provides transformer-coupled EIA-485 operation. Certain applications require that the COM20022 be operated in backplane mode. The PC10422-4000 is intended for these applications and supports the transformer-coupled EIA-485 physical-layer interface. All EIA-485 models are fitted with dual RJ-11s and a three-position screw terminal connector to ease field wiring.

Ordering Information


Model RoHS Description Purchase
20022 PC/104 AC-coupled EIA-485 NIM (backplane controlled by software)
20022 PC/104 DC-coupled EIA-485 NIM (backplane forced by hardware)
20022 PC/104 AC-coupled EIA-485 NIM (backplane forced by hardware)
20022 PC/104 coaxial bus NIM
20022 PC/104 coaxial star NIM
20022 PC/104 twisted-pair bus NIM


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