Measurement PCI-COM232 User Manual

PC104-DIO48

User’s Manual

Revision 4

April, 2001

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Table of Contents

1 SOFTWARE INSTALLATION
2 HARDWARE INSTALLATION

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3 CONTROL & DATA REGISTERS

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4 SPECIFICATIONS
5 ELECTRONICS AND INTERFACING

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1

12.1 BASE ADDRESS

32.2 INSTALLING THE BOARD

32.3 CABLING TO THE DIO48 CONNECTOR

32.4 SIGNAL CONNECTION

42.5 UNCONNECTED INPUTS

52.6 CONNECTOR DIAGRAM
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73.1 DIGITAL I/O REGISTERS
11
12

125.1 PULL UP & PULL DOWN RESISTORS

145.2 TTL TO SOLID STATE RELAYS

155.3 VOLTAGE DIVIDERS

175.4 LOW PASS FILTERS DE-BOUNCE INPUTS

This page is blank.

1 SOFTWARE INSTALLATION

The board has switches and jumpers to set before installing the board in
your computer. By far the simplest way to configure your board is to use
the InstaCal
InstaCal
various switches and jumpers (as applicable) to match your application
requirements, and will create a configuration file that your application
software (and the Universal Library) will refer to so the software you use
will automatically know the exact configuration of the board.

TM

program provided as part of your software package.

TM

will show you all available options, how to configure the

Please refer to the Extended Software Installation Manual regarding the

TM

installation and operation of InstaCal

. The following hard copy
information is provided as a matter of completeness, and will allow you
to set the hardware configuration of the board if you do not have

TM

immediate access to InstaCal

and/or your computer.

2 HARDWARE INSTALLATION

2.1 BASE ADDRESS

The PC104-DIO48 employs the PC bus for power, communications and
data transfer. As such it draws power from the PC, monitors the address
lines and control signals and responds to it's I/O address, and it receives
and places data on the eight data lines.

The base address is the starting location that software writes to and reads
from.

The base address
switch is the means for
setting the base
address. Each switch
position corresponds to
one of the PC bus
address lines. The
down position activates
that address bit.

1 2 3 4 5 6 7

BASE ADDR ESS SW ITCHES – 300h Shown.

SWITCH HEX

1 200
2 100
3 80
4 40
5 20
6 10
7 08

Figure 2-1. Base Address Switches

1

The actual address is constructed by calculating the HEX or decimal
number Base Address Select Switches which corresponds to the base
address bits the PC104-DIO48 will respond to. For example, in Figure
2-1, switches 1 and 2 down, all others are up. Switch 1 = 200 hex (512
decimal) and switch 2 = 100 hex (256 decimal). When added together
they equal 300 hex (768 decimal).

Certain address are reserved for use by the PC (Table 2-1). Others are
free and can be used by the PC104-DIO48 and other expansion boards.
We recommend that BASE = 300 hex (768 decimal) be tried first. See
Figure 2-2 for the orientation of the switch block.

Table 2-1. PC I/O Addresses

FUNCTIONHEX

EGA2C0-2CF8237 DMA #1000-00F
EGA2D0-2DF8259 PIC #1020-021
GPIB (AT)2E0-2E78253 TIMER040-043
SERIAL PORT2E8-2EF8255 PPI (XT)060-063
SERIAL PORT2F8-2FF8742 CONTROLLER (AT)060-064
PROTOTYPE CARD300-30F
PROTOTYPE CARD310-31FDMA PAGE REGISTERS080-08F
HARD DISK (XT)320-32F8259 PIC #2 (AT)0A0-0A1
PARALLEL PRINTER378-37FNMI MASK (XT)0A0-0AF
SDLC380-38F8237 #2 (AT)0C0-0DF
SDLC3A0-3AF80287 NUMERIC CO-P (AT)0F0-0FF
MDA3B0-3BBHARD DISK (AT)1F0-1FF
PARALLEL PRINTER3BC-3BFGAME CONTROL200-20F
EGA3C0-3CFEXPANSION UNIT (XT)210-21F
CGA3D0-3DFBUS MOUSE238-23B
SERIAL PORT3E8-3EFALT BUS MOUSE23C-23F
FLOPPY DISK3F0-3F7PARALLEL PRINTER270-27F
SERIAL PORT3F8-3FFEGA2B0-2BF

RANGE

070-071

FUNCTIONHEX

RANGE

CMOS RAM & NMI MASK (AT)

The PC104-DIO48 BASE switch may be set for address in the range of
000 to 3F8 so it should not be hard to find a free address area for your
PC104-DIO48. Once again, if you are not using IBM prototyping cards
or some other board which occupies these addresses, then 300-31Fh are
free to use. Addresses not specifically listed, such as 390-39Fh, are free.

2

2.2 INSTALLING THE BOARD

1. Turn the power off.

2. Push the board firmly down into the expansion bus connector. If it is
not seated fully it may fail to work and could short circuit the PC bus
power onto a PC bus signal. This could damage the motherboard in your
PC as well as the PC104-DIO48.

2.3 CABLING TO THE DIO48 CONNECTOR

The connector is a standard 50-pin, male, header connector. A mating
female connector (C50FF-##) may be purchased from Measurement
Computing.

2.4 SIGNAL CONNECTION

All the digital outputs/inputs on the connector are CMOS TTL. TTL is
an electronics industry term, short for Transistor Transistor Logic, which
describes a standard for digital signals which are either 0V or 5V
(nominal).

Under normal operating conditions, the voltages on the 82C55 pins
range from near 0 volts for the low state to near 5.0 volts for the high
state. Before connecting the PC104-DIO48 to external devices, review
the electrical specification in this manual to ensure that the boards input
voltage specifications are not exceeded. In addition to voltage and load
matching, digital signal sources often need to be de-bounced. More
details on digital interfacing are in the section on Interface Electronics in
this manual.

3

Figure 2-2. PC104-DIO48 Board Layout and Pin 1 Location

IMPORTANT NOTE: The PC104-DIO48 uses two 82C55 digital
chips for digital I/O. The 82C55 digital I/O chip initializes all ports as
inputs on power up and reset. A TTL input is a high impedance input.
If you connect another TTL input device to the 82C55 it will probably be
turned ON every time the 82C55 is reset, or, it might be turned OFF
instead. Remember, an 82C55 which is reset is in INPUT mode.

To safeguard against unwanted signal levels, all devices being controlled
by an 82C55 should be tied low (or high, as required) by a 2.2K ohm
resistor.

You will find positions for pull up and pull down resistor packs on your
PC104-DIO48 board. To implement these, please turn to the application
note on pull up/down resistors.

2.5 UNCONNECTED INPUTS

Keep in mind that unconnected inputs float. If you are using a
PC104-DIO48 board for input, and have unconnected inputs, ignore the
data from those lines.

4