Data Sheet PCX20 Series Network Interface Modules for PC/XT/AT Bus Computers  No requirement for wait-state arbitration  Enhanced software capabilities over earlier generation ARCNET controllers  Supports coaxial, fibre optic, and twisted-pair cabling including EIA-485  Node address switch selects one of 255 possible station addresses  Variable data rates up to 5 Mbps  Suitable with all Contemporary Controls MOD HUB and AI Series active hubs  CMOS design for low-power consumption  CE Mark  Utilises COM20020 ARCNET controller  RoHS  Interfaces ARCNET with XT/AT (ISA) bus computers  I/O-only mapping reduces bus contention problems PRODUCT OVERVIEW There are eight models within the PCX20 Series. The PCX20 Series of Network Interface Modules The PCX20-CXS supports coaxial star configurations (NIMs) offers dependable ARCNET connectivity requiring external hubs if other than point-to-point for XT/AT compatible computers. communication is needed. The PCX20-CXB accommodates This product is designed with the COM20020 ARCNET a multidrop or coaxial bus configuration, typically without controller chip. Features include command chaining, any hubs. Other versions include the PCX20-FOG-ST for sequential access to internal RAM, duplicate node ID fibre optic cable with ST connectors. The PCX20-TPB supports detection, and variable data rates up to 5 Mbps. There is multidrop twisted-pair cabling using RJ-11 and screw no requirement for wait-state arbitration. terminal connectors. Two units provide DC-coupled EIA-485 operation: the PCX20-485 allows backplane mode to be Each PCX20 module has two LEDs on the board controlled by the user’s software, while the PCX20-485D for monitoring network operation and bus access forces backplane mode via hardware for those users having to the module. It also has an external DIP switch so that legacy software that is incapable of invoking backplane node addresses can be easily reassigned without removing control. The PCX20-485X offers transformer-coupled the module or opening the computer case. EIA-485 operation with the backplane mode forced through hardware. Page 1 TD872600-0DF Data Sheet PCX20 Series Specifications Environmental Operating temperature 0°C to +60°C Storage temperature –40°C to +85°C Functionality Data rate PCX20-CXB, -CXS, -TPB 2.5 Mbps PCX20-FOG-ST, -485, -485D 5 Mbps, 2.5 Mbps, 1.25 Mbps, 625 kbps, 312.5 kbps, 156.25 kbps PCX20-485X 5 Mbps, 2.5 Mbps, 1.25 Mbps Dimensions 3.9" x 4.3" (99 mm x 109 mm) Shipping weight 1 lb. (0.45 kg) I/O mapping Supports I/O mapping on any 16-byte boundary Interrupt lines Supports strapping of IRQ 2/9, 3, 4, 6 or 7 Compliance PCX20 Series NIMs are fully compatible with all of Contemporary Controls’ ARCNET products and PC/XT/AT computers. Transceiver Specifications TransceiverDescription Cable Connectors Cable Length Max Nodes/ Min Max Bus Segment 1 -CXB Coaxial bus RG-62/u BNC 6ft/2m 1000ft/305m 8 -CXS Coaxial star RG-59/u BNC 0 1500ft/457m N/A -CXS Coaxial star RG-62/u BNC 0 2000ft/610m N/A -FOG Duplex fibre optic 50/125 ST 0 3000ft/915m N/A -FOG Duplex fibre optic 62.5/125 ST 0 6000ft/1825m N/A 2 -FOG Duplex fibre optic 100/140 ST 0 9000ft/2740m N/A 1 -TPB Twisted-pair bus IBM Type 3 RJ-11, screw 6ft/2m 400ft/122m 8 3 -485 DC-coupled EIA-485 IBM Type 3 RJ-11, screw 0 900ft/274m 17 -485D DC-coupled EIA-485 IBM Type 3 RJ-11, screw 0 900ft/274m 17 -485X AC-coupled EIA-485 IBM Type 3 RJ-11, screw 0 700ft/213m 13 1 This represents the minimum distance between any two nodes or between a node and a hub. 2 This minimum can only be achieved by removing a jumper on the transceiver circuitry. 3 Backplane mode operation. Page 2 TD872600-0DF Data Sheet PCX20 Series Power Requirements Model +5 V –12V PCX20-485 200 mA N/A PCX20-485D 200 mA N/A PCX20-485X 200 mA N/A PCX20-CXB 200 mA 50 mA PCX20-CXS 200 mA 20 mA PCX20-FOG-ST 300 mA N/A PCX20-TPB 200 mA 50 mA Ordering Information Model Description PCX20-485 20020 DC-coupled EIA-485 NIM allows software control of backplane mode PCX20-485D 20020 DC-coupled EIA-485 NIM forces backplane mode via hardware PCX20-485X 20020 AC-coupled EIA-485 NIM forces backplane mode via hardware PCX20-CXB 20020 coaxial bus NIM PCX20-CXS 20020 coaxial star NIM PCX20-FOG-ST 20020 ST fibre optic NIM PCX20-TPB 20020 twisted-pair bus NIM Contemporary Controls, ARC Control, ARC DETECT, EXTEND-A-BUS and CTRLink are registered trademarks or trademarks of Contemporary Control Systems, Inc. Specifications are subject to change without notice. Other product names may be trademarks or registered trademarks of their respective companies. © Copyright 2007 Contemporary Control Systems, Inc. www.ccontrols.com Contemporary Control Systems, Inc. 2431 Curtiss Street Downers Grove, Illinois 60515 USA Telephone (630) 963-7070 Fax (630) 963-0109 Page 3 TD872600-0DF September 2007