Key features

  • Electrically isolated BNC and D-sub sockets on-board
  • 16 bit ISA bus card
  • ARCNET controller COM20022
  • Termination of RS-485 interface switchable by means of DIP switch
  • Protecting HITs (sine dipulse transceivers) against incorrect mode or speed
  • Bit rate 156 kbit/s to 10 Mbit/s (sine dipulse 2.5 Mbit/s only)
  • Requiring 16 I/O addresses; base address selectable by means of DIP switch
  • Interrupt selectable by means of jumper
  • Triple timer module (optional)

Order information

Order name Bit rateSignalSocketCable type
SH ARC-ISA-K 2.5 Mbit/s sine dipulse BNCcoaxial cable RG-62
SH ARC-ISA-KR 1*)156.25 kbit/s – 10 Mbit/s /
2.5 Mbit/s
and sine dipulse
and BNC
twisted pair cable
and coaxial cable RG-62

1*) With SH ARC-ISA-KR either the coaxial or the RS-485 interface can be used at the same time!

Scope of application

The ARCNET card SH ARC-ISA serves as an interface to the field bus ARCNET in industrial PCs or main terminals. The card offers a BNC and a D-sub connector for sine dipulse and RS-485 (EIA-485) transmission via coaxial and twisted pair cables respectively to ensure a maximum of flexibility.

Owing to SOHARD’s standardized driver interface the SH ARC-ISA may substitute any other SOHARD ARCNET card without major effort.

Design & Functionality

The card features the following components:

ARCNET controller
The card uses the ARCNET controller COM20022 from SMSC which is fully compatible with the COM20020. It supports bit rates up to 10 Mbit/s as well as additional settings.

ISA bus interface
The 16 bit ISA bus card allows the use of interrupts between 2 and 15. Only 16 I/O addresses will be occupied, their start address being fully adjustable.

Fieldbus connection
You may use the integrated coaxial or RS-485 (EIA-485) interface at your choice. RS-485 allows for bit rates up to 10 Mbit/s, the coaxial interface for a fixed rate of 2.5 Mbit/s. A protective logic prevents the coaxial transceiver from being destroyed due to low data rates or usage of the backplane mode.

Timer module (optional)
The 82C54 timer module from Intel offers three disposable timers which can be used for control and monitoring tasks. This module allows, e.g., to mark a received package with a real-time time-stamp.


  • Compatibility: ANSI/ATA 878.1, CE for industrial environment
  • Power requirements: ±5 V from PC, 5 W max
  • Temperature range, operation: 0°C to +55°C
  • Temperature range, storage: -20°C to +85°C
  • Dimensions (w/h/d) in mm, w/o conn.: 156/21/129
  • Weight: max 200 g packing included