SHEET ARCNET Interface Modules for PC/104™ Bus Computers Like the PC10420 Series of Network Interface Modules (NIMs), the PC10422 Series enables ARCNET connectivity for PC/104 compatible computers. But 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. Each NIM has two LEDs to monitor network operation and bus access. An 8-bit DIP switch can set the node address without the removing the module. The node address can be configured via software — leaving the DIP switch for user-defined functions such as data rate, cable interface, or master/slave status of the system. This series implements three EIA-485 physical layers. The PC10422-485D supports DC-coupling while the PC10422-485X provides transformer coupling. If your software will set the backplane mode, choose the PC10422-4000 (transformer-coupled). All EIA-485 models are fitted with dual RJ-11s and a three-position screw terminal connector to ease field wiring. Transceiver options are explained on the next page. • 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 • CE Mark • RoHS compliant • Utilizes COM20022 ARCNET controller • Interfaces ARCNET with PC/104 bus computers • Zero wait-state arbitration typical • Enhanced software capabilities over earlier generation ARCNET controllers

Data Sheet — PC10422 Series Transceiver Options Dipulse (Analogue) Signals Cards with -CXB transceivers accept RG-62/u cable via BNC Tee connectors. Each node is a highimpedance 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. Backplane mode is invoked in the -485D card via the card’s own hardware for twisted-pair up to 274 m in length and up to 17 nodes. Use proper cable and maintain wiring phase integrity among all nodes. Use 120Ω termination and...

Data Sheet — PC10422 Series Specifications Environmental/Mechanical Operating temperature Storage temperature Relative humidity Data rate Supports I/O mapping on any 16-byte boundary Green — flashes when the unit receives ARCNET traffic from the network Yellow — flashes when the unit is communicating with its host computer Shipping Weight Regulatory Compliance Power Requirements Fieldbus Connectors and Cabling Minimum distance between any two network devices. Backplane mode controlled by software. 3 One three-position screw terminal and two RJ-11 connectors are on each NIM. 4 T-P = Twisted-pair,...

Data Sheet — PC10422 Series Screw Connector Pin Assignments 1 LINE+ LINE+ LINE LINE+ 2 LINE- LINE- LINE LINE- 3 SHIELD SHIELD SHIELD SHIELD Ordering Information 20020 PC/104 DC-coupled EIA-485 NIM (backplane set by software) 20020 PC/104 DC-coupled EIA-485 NIM (backplane set by hardware) 20020 PC/104 DC-coupled EIA-485 NIM (backplane set by hardware) * NIM is an abbreviation for network interface module. Fieldbus Connector United States Contemporary Control Contemporary Controls Science & Technology Industrial Park United Kingdom Fletchworth Gate United Kingdom Contemporary Controls