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EVB-20020 Industrial ARCNET AT Adapter Card
SMSC UG - EVB-20020
Rev. 1/5/00
(c) 2000 STANDARD MICROSYSTEMS CORPORATION (SMSC)
80 Arkay Drive Hauppauge, NY 11788 (631) 435-6000 FAX (631) 273-3123
Circuit diagrams utilizing SMSC products are included as a means of illustrating typical applications; consequently complete information sufficient for construction purposes is not necessarily given. The information has been carefully checked and is believed to be entirely reliable. However, no responsibility is assumed for inaccuracies. Furthermore, such information does not convey to the purchaser of the semiconduc tor devices described any licenses under the patent rights of SMSC or others. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice in order to improve design and supply the best product possible. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature may be obtained by visiting SMSC's website at http://www.smsc.com
SMSC UG - EVB-20020
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Rev. 1/5/00
EVB-20020 Industrial ARCNET AT Adapter Card * Based on COM20020 Industrial Network Controller * Supports both standard and backplane signaling schemes * COAX and UTP support for standard ARCNET signaling in both bus and star topologies * Isolated and direct RS485 interfaces * All media interfaces are jumper selectable * Data rates from 156 Kbps to 5 Mbps * 8 bit, I/O mapped bus interface, I/O address is switch selectable * On-board node ID switch * Capable of receiving all packets * Includes demo software * Sample driver, network monitor and mapping routes APPLICATIONS: Test equipment, network development and debug, network management/monitoring, network evaluation, performance analysis
SMSC UG - EVB-20020
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Rev. 1/5/00
USER'S MANUAL FOR EVB-20020 INDUSTRIAL ARCNET ADAPTER CARD I/O Address Selection The EVB-20020 is an 8 bit I/O mapped card. The I/O address is selected via DIP switch S1. The switch positions correspond to address bits A9 - A3. The switch is factory set for address 2E0h. If you encounter problems accessing the card then you must change the value of the address. To set the address simply set the switch according the binary representation of that address. For example, address 2E0h would be 1011100. Addresses XX0 - XX7 are used by the network controller and address XX8 selects the Node ID switch. Node ID Selection The EVB-20020 is equipped with an on-board Node ID switch mapped at address XX8. The COM20020 network controller requires a software programmable ID, therefore the switch does not automatically provide a Node ID to the COM20020. The switch only provides a value to be programmed by the software. Media Interfaces (Transceivers) The EVB-20020 supports four types of media interfaces : traditional ARCNET coax and twisted pair line interfaces, direct coupled RS-485, and isolated RS-485 (twisted pair) ports. Coaxial Interface The Coaxial interface uses a standard 93 ohm BNC connector (the same as a 50 ohm BNC) and requires RG-62 type cable with 93 ohm terminations. The coaxial interface can be used in a bus topology within the following guidelines: 1. 2. 3. 4. Max. distance 1000 (without repeaters) Min. distance between nodes 3 Max. number of node per segment 8 (i.e. no repeaters) Max. number of nodes with repeaters 255
Operation is valid only at 2.5 Mbps and uses the SMSC HYC9088 hybrid. Twisted Pair (TP) Interface The twisted pair interface utilizes standard 105 ohm 24 AWG unshielded twisted pair cable. The connectors are RJ-11 modular telephone jacks and follow the ARCNET Trade Association (ATA) standard pinout for twisted pair with Phase A on pin 3 and Phase B on pin 2. The twisted pair interface can be used in a bus topology within the following guidelines: 1. 2. 3. Max. distance 400 (without repeaters) Min. distance between nodes 6 Max. # of nodes 10 (without repeaters)
The line must be terminated at each end of the cable with a 105 ohm impedance resistor. Stubs or drops are not allowed in the TP interface, cable segments should be connected in a daisy chained fashion. Note that this TP interface can only be operated at 2.5 Mbps and uses the SMSC HYC9088 hybrid. Direct Coupled RS-485 The Direct Coupled RS-485 interface uses an RJ-11 connector with Phase A on pin 3 and Phase B on pin 4. Recommended cable is 24AWG unshielded twisted pair such as Belden #9562. Biasing resistors are provided (470 ohms) for squelching of reflections. A 75ALS176B transceiver is used. Short stubs or drops of less than 1 ft. can be accommodated but are not recommended. Data rates from 156 Kbps to 5.0 Mbps are allowed. Note that the Direct Coupled RS-485 interface is not compatible with either the isolated RS485 or the standard ARCNET twisted pair interface. Isolated RS-485 The Isolated RS-485 interface employs transformer coupling to electrically isolate the data lines and make the connections insensitive to polarity. Isolation is provided up to 2KV. Data rates from 156 Kbps to 5.0 Mbps are accommodated. Connections are made via pin 2 and 3 of the RJ-11 connectors. Note that the isolated 485 transceiver utilizes a different modulation technique than the direct coupled scheme and should not be mixed with direct coupled interfaces or with the standard ARCNET twisted pair interface.
SMSC UG - EVB-20020
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Rev. 1/5/00
Jumpers There are three sets of jumper blocks on the EVB-20020 board. JP1-4 selects the clock speed of the network controller. JP1 and JP2 MUST BE INSTALLED for proper operation. JP3 and JP4 are for future use and should be left unconnected. JP9, JP10, and JP11 select the source of data for the network controller's receiver. JP12 - 17 are used to choose the media type. Refer to the following table for the correct jumper settings: MEDIA TYPE Coax Twisted Pair Direct RS-485 Isolated RS-485 Interrupts If your software is to be interrupt driven, the priority of the interrupt is selected through JP5-JP8 (IRQ3-6). CONNECT JUMPERS JP11 JP11, JP16, JP17 JP9, JP12, JP13 JP10, JP14, JP15
SMSC UG - EVB-20020
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Rev. 1/5/00

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