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Model: PC10420
Manufacturer: Contemporary controls
PC/104 Bus Compatible ARCNET Network Interface Module
Product Status: Active - Active products are produced on a regular manufacturing schedule and are actively supported products. Active products are not necessarily in stock in the USA. Lead time to ship date for Active products is typically stock to 15 business days ARO.

Stock Status: Call

Designed to operate with PC/104 compatible computers, the PC10420 Series of ARCNET Network Interface Modules (NIMs) uses the COM20020 ARCNET controller chip with enhanced features. New performance and integration enhancements include command chaining operation 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.

ARCNET is classified as a token-bus LAN operating at 2.5 Mbps while supporting 255 nodes. Interfacing ARCNET to a host computer usually requires a Network Interface Module which plugs into the host computer's bus.

Each PC10420 has two LEDs on its board for monitoring network operation and providing bus access. The green LED indicates that the module is receiving data on the network and the yellow LED indicates bus access to the module. The PC10420 also has an external 8-bit DIP switch so that node addresses can be easily reassigned without removing the module.

The PC10420 is available in several transceiver options. Each transceiver, which is matched to a particular cable type, is identified by a three-character suffix appeneded to the model numbers. The capabilites of each transceiver differs.The PC10420-CXS accommodates coaxial star configurations requiring external active or passive hubs. The PC10420-CXB supports a coaxial bus configuration usually without hubs. Other models are the PC10420-FOG which supports fiber optic cable with either ST or SMA connectors. The PC10420-TPB supports twisted-pair bus cabling using RJ-11 connectors. The PC10420-485D supports the EIA-485 DC-coupled cabling standard while the PC10420-485X provides transformer-coupled EIA-485 operation.

If the software driver you intend to use sets the COM20020 into backplane mode, you will need the PC10420-485 version. The AC coupled EIA-485 transciever offers certain advantage. No bias adjustments are necessary since each transceiver has its own fixed bias network isolated by a pulse transfomer. DC coupled technology, however, offers longer distances and will operate over all six data rates.


  • Utilizes COM20020 ARCNET controller
  • Interfaces ARCNET with PC/104 bus computers
  • I/O-only mapping reduces bus contention problems
  • No requirement for wait-state arbitration
  • Deterministic, high-speed ARCNET token-passing local area network (LAN)
  • 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, fiber optic and twisted-pair cabling including EIA-485
  • Suitable with all Contemporary Controls' MOD HUB and AI Series active hubs
  • CMOS design for low-power consumption
Contemporary controls PC10420-FOG-SMA
20020 PC/104 SMA fiber optic NIM
Contemporary controls PC10420-FOG-ST
20020 PC/104 ST fiber optic NIM
Contemporary controls PC10420-485D
20020 PC/104 DC coupled EIA-485 NIM
Contemporary controls PC10420-485X
20020 PC/104 AC coupled EIA-485 NIM
Contemporary controls PC10420-CXB
20020 PC/104 coaxial bus NIM
Contemporary controls PC10420-CXS
20020 PC/104 coaxial star NIM
Contemporary controls PC10420-TPB
20020 PC/104 twisted-pair bus NIM