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PCM20H
ARCNET® Network Interface Modules for PC Card Computers
INSTALLATION GUIDE
INTRODUCTION
The PCM20H series of ARCNET network interface modules (NIMs) links
PC Card compatible computers with the ARCNET local area network
thereby providing ARCNET connectivity to laptop and notebook style
computers.
The PCM20H conforms to release 2.1 of the
PC Card standard
Type II (5.0
mm thick) cards. The ARCNET transceiver circuitry is located in a
detachable MAU (medium access unit) which plugs into the PCM20H
adapter. MAUs exist for various cabling media such as coaxial cable and
twisted-pair cable and are all interchangeable with one another. A 15-pin
connector with a short cable attaches the MAU to the adapter.
The PCM20H incorporates the
COM20022
ARCNET controller with
enhanced features over earlier generation ARCNET chips. New features
include command chaining, sequential access to internal RAM, duplicate
node ID detection and variable data rates. Data rates from 156 kbps to
10 Mbps are possible.
There are several versions of the PCM20H, each of which is designated by a
particular transceiver. The PCM20H-CXB can support either coaxial star or
bus networks. The PCM20H-TB5 and PCM20H-TPB support twisted-pair
bus with either RJ-45 or RJ-11 connectors. The PCM20H-485D supports
non-backplane mode DC EIA-485. The PCM20H-485X supports non-
backplane mode AC EIA-485. The PCM20H-485 supports backplane mode
DC EIA-485 while the PCM20H-485T supports backplane mode AC
EIA-485.
The PCM20H is shipped with a 3.5" (9cm) disk containing our DOS,
Windows 3.x, and Windows 95, 98 enabler software. Once loaded,
programs written for the PCX20 will transparently operate with the
PCM20H.
The PCM20H is primarily intended for industrial applications. Although
functionally equivalent to its predecessors the PCM20 and PCM20E, the
PCM20H has improved EMC performance, ruggedized MAU case and
locking MAU connector. The PCM20, PCM20E and PCM20H are all
software compatible.
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Related Manuals for Contemporary Controls PCM20H Series
Summary of Contents for Contemporary Controls PCM20H Series
- Page 1 ARCNET® Network Interface Modules for PC Card Computers INSTALLATION GUIDE INTRODUCTION The PCM20H series of ARCNET network interface modules (NIMs) links PC Card compatible computers with the ARCNET local area network thereby providing ARCNET connectivity to laptop and notebook style computers.
- Page 2 11.125" (28.3cm) Approx. MAU base to adpater base Shipping Weight 1 lb. (.45kg) I/O Mapping Supports I/O mapping on any 16-byte boundary Interrupt Lines Supports IRQ2 through 15 Compatibility PCM20H series NIMs are compliant with ANSI/ATA 878.1 PC Card Standard Feb. 1995. Power Requirements Model PCM20H-CXB...
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Page 3: Installation
INSTALLATION The PCM20H conforms to release 2.1 of the PC Card standard Type II (5.0 mm thick) cards. Consult your laptop or notebook user manual for instructions on how to install the adapter card. Attached via a 15-conductor cable to the adapter card is a medium access unit. Field connections are made to the medium access unit. - Page 4 2E8h. If you request a base address of 2E0h for the PCM20H PC Card ARCNET Adapter, Card Services will reject your request because of the overlap occurring between 2E8h to 2EFh. If this occurs, you will either have to select a different address for the PCM20H PC Card ARCNET Adapter, or remove the COM4 hardware from your computer.
- Page 5 PCM20H Enabler for Windows 95/98/ME—Loading Instructions: Plug in your PCM20H PC Card. If the “New Hardware Found” dialog is shown, select the “Driver from a disk provided by hardware manufacturer” option, insert this disk and press “OK.” If the “Update Device Driver Wizard” dialog is shown, then insert this disk and follow the instructions provided by Windows.
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Page 6: Field Connections
parameter is the base I/O address of the PCM20H (in hex). The second parameter is the interrupt setting used by the PCM20H (in decimal). For example: irqtest 2E0 5. NETMAP.EXE: This program, which provides a list of the nodes currently on your network, requires just the base I/O address of the PCM20H (in hex). - Page 7 Passive hubs should not be used with -CXB NIMs and only the use of RG-62/u coaxial cable is recommended for segments. Contemporary Controls (CC) also supplies BNC terminators and Tee connectors. Ask for BNC-TER and BNC-T respectively. One note of caution, there is a minimum cable length between nodes (6 feet /2 meters).
- Page 8 The overall distance of a twisted-pair network can be expanded beyond 400 feet if active hubs are used. Use a hub port that supports a balanced twisted- pair signal (-TPS) or use a BALUN. CC recommends a Mux Labs BALUN Figure 3–TB5 NIMs are connected in a daisy-chain fashion with terminators inserted at both end NIMs.
- Page 9 Figure 4–TB5 bus segments can be extended through active hubs. Termination Each end of the segment must be terminated in the characteristic impedance of the cable. If it is desired to apply termination, connect a 100 ohm ¼ watt resistor across pins 1 and 2. Bias In addition to the termination, it is also necessary to apply bias to the twisted-pair network so that when the line is...
- Page 10 Segments of -485D connected NIMs or MAUs can be extended through the use of active hubs. Select a MOD HUB expansion module with a -485 compatible port. Connect one end of the segment to this port following the same termination rules as used for a NIM. This hub port counts as one NIM when cable loading is being calculated.
- Page 11 the DC coupled EIA-485, wiring polarity is unimportant. Either inverted or straight through cable can be used or even mixed within one AC coupled network. Much higher common mode voltage levels can be achieved with AC coupling due to the transformer coupling which has a 1000 Vdc breakdown rating.
- Page 12 Technical Support. Warranty Contemporary Controls (CC) warrants its product to the original purchaser for one year from the product’s shipping date. If a CC product fails to operate in compliance with its specification during this period, CC will, at its option, repair or replace the product at no charge.
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