Contemporary Control Systems PC10420 User Manual

PC10420

ARCNET® Network Interface Modules for PC/104 Bus Computers

INST ALLA TION GUIDE

INTRODUCTION

The PC10420 series of ARCNET network interface modules (NIMs) links
PC/104 compatible computers with the ARCNET local area network (LAN).

ARCNET is classified as a token-bus LAN operating at a nominal 2.5 Mbps
while supporting 255 nodes. Interfacing ARCNET to a host computer
usually requires a NIM which plugs into the host computer’s bus.

The PC10420 incorporates the newer COM20020 ARCNET controller chip
with enhanced features over the earlier generation ARCNET chips. New
performance and integration enhancements include command chaining
operation and an internal 2K x 8 RAM buffer. There is no requirement for
wait-state arbitration.

Each PC10420 module has two LEDs on the board. The green LED
indicates that the module is receiving data on the network and the yellow
LED indicates bus access to the module. The PC10420 also has a piano
style DIP switch so that node addresses can be easily reassigned without
removing the module.

There are several versions of the PC10420 ARCNET NIM. The
PC10420-CXS supports coaxial star configurations requiring external
active or passive hubs. The PC10420-CXB supports coaxial bus
configuration usually requiring no hubs. Other versions include the
PC10420-FOG which supports fiber optic cable with either ST or SMA
connectors. The PC10420-TPB supports twisted-pair bus cabling using
RJ-11 and screw terminal connectors. There are various versions that
support EIA-485 communication each using RJ-11 and screw terminal
connectors.

On some models, operation up to 5.0 Mbps is possible. These models are
identified with a /5 designation.

SPECIFICATIONS

Environmental

Operating temperature: 0°C to +60°C
Storage temperature: –40°C to +85°C

Data Rates

PC10420* 2.5 Mbps, 1.25 Mbps, 625 kbps, 312.5 kbps, 156.25 kbps
PC10420/5* 5.0 Mbps, 2.5 Mbps, 1.25 Mbps, 625 kbps, 312.5 kbps

* The -CXS, -CXB and -TPB models can only operate at 2.5 Mbps.

The -485X model can only operate at 1.25, 2.5 or 5.0 Mbps.

Dimensions

3.550" x 3.775"
(90 mm x 95 mm)

Shipping Weight

1 lb. (.45 kg)

I/O Mapping

Supports I/O Mapping on any 16-byte boundary

Interrupt Lines

Supports strapping of IRQ 2/9, 3, 4, 5, 6, or 7

Compatibility

PC10420 series NIMs are compliant with ANSI/ATA 878.1 and PC/104

Specification 2.3.

Regulatory Compliance

FCC Part 15 Class A

Power Requirements

Model +5V –12V

PC10420-CXS 200 mA 20 mA
PC10420-CXB 200 mA 50 mA
PC10420-FOG-SMA 300 mA N/A
PC10420-FOG-ST 300 mA N/A
PC10420-TPB 200 mA 50 mA
PC10420-485 200 mA N/A
PC10420-485D 200 mA N/A
PC10420-485X 200 mA N/A
PC10420/5-485 200 mA N/A
PC10420/5-485D 200 mA N/A
PC10420/5-485X 200 mA N/A
PC10420/5-FG-ST 300 mA N/A

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INSTALLATION
Passive P2 Connector

Although the PC10420 is an eight-bit module, the PC10420 does provide a
P2 connector used for 16-bit applications. The advantage of the P2
connector is that 8-bit modules, such as the PC10420, can be located in the
middle of the PC/104 stack without compromising the integrity of the 16-bit
bus. Signals from the PC10420 are not connected to the passive P2
connector.

Mounting the PC10420

The PC10420 incorporates stack-through connectors and is shipped with
four 0.6" standoffs to facilitate mounting of the PC10420 onto the PC/104
stack. The PC10420 should be mounted below the 8-bit modules if any are
present in the system. If another eight-bit module is to be mounted above
the PC10420, use the enclosed standoffs. On some older eight-bit modules,
only two mounting holes are provided so only two standoffs are used. If
the PC10420 is the last module on the stack, use either two or four
M3x0.5-5MM panhead screws (not provided) to complete the mounting
onto the stack. Once mounted, field connections can be made.

Since the PC/104 stack does not make provision for a chassis (earth)
connection, a metal screw terminal has been provided for this purpose.
Simply connect one end of a green earthing wire to the screw terminal and
the other end to a suitable chassis ground.

Register Map

The PC10420 requires 16 contiguous I/O address locations in order to
access the COM20020 register and node ID switch. Because several
locations are reserved, it is important not to address another device to these
locations. The register map is shown in Table 1.

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I/O Read Write
Address Register Register

Base + 0 Status Interrupt Mark
Base + 1 Diagnostic Status Command
Base + 2 Address Pointer High Address Pointer High
Base + 3 Address Pointer Low Address Pointer Low
Base + 4 Data Data
Base + 5 Reserved Reserved
Base + 6 Configuration Configuration

Base + 7 Test ID/..../Next ID Test ID/..../Next ID

Base + 8 Node ID Switch Reserved
Base + 9 Node ID Switch Reserved
Base + A Reserved Reserved
Base + B Reserved Reserved
Base + C Reserved Reserved
Base + D Reserved Reserved
Base + E Reserved Reserved
Base + F Reserved Reserved

Table 1—Register Map

I/O Base Addressing

The I/O base address for the register map can be set with jumpers. The
PC10420 does not require any memory address space—simplifying
installation. See Table 2 for details.

A9 A8 A7 A6 A 5 A4 I/O ADDRESS

n nnnn 100
nnnn 110
nnn n 120
nnn 130
nn nn 140
nn n 150
nn n 160
nn 170
n nnn 180
nnn 190
nnn1A0
nn 1B0
nnn1C0
nn1D0
nn1E0

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A9 A8 A7 A6 A5 A4 I/O ADDRESS

n 1F0

nnnnn 200
nn n n 210
nn n n 220
nn n 230
nn n n 240
nn n 250
nn n 260
nn 270
n nnn 280
nnn 290
nn n 2A0
nn 2B0
nnn2C0
nn 2D0
nn2E0
n 2F0

nnnn 300* Default
nn n 310
nn n 320
nn 330
nnn 340
nn 350
nn360
n 370

nnn 380
nn 390
nn 3A0
n 3B0

nn 3C0
n 3D0

n 3E0

3F0

Key: n = Install Jumper

Table 2—I/O Base Address

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