B&B Electronics 2IQEC4, 2IQEC2 User Manual

Quadrature Encoder Counter Board

Models: 2IQEC2 2IQEC4

Documentation Number 2IQEC2/43798

This product

Designed and Manufactured

In Ottawa, Illinois

USA

of domestic and imported parts by

B&B Electronics Mfg. Co. Inc.

707 Dayton Rd. P.O. Box 1040 -- Ottawa, IL 61350

PH [phone] -- FAX [phone]

Internet:

http://www.bb-elec.com

[e-mail]

[e-mail]

 1998 B&B Electronics -- September 1998

2IQEC2/43798 Manual Cover Page

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

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Table of Contents

CHAPTER 1: INTRODUCTION............................................................ 1

P

ACKING LIST...........................................................................................1

A

DDRESS SWITCH SETUP..........................................................................1

S

PECIFICATIONS........................................................................................ 2

CHAPTER 2: INSTALLATION............................................................. 3

OFTWARE INSTALLATION........................................................................ 3

S
I

NSTALLING THE CARD ............................................................................. 3

C

ARD SETTINGS........................................................................................ 3

Address................................................................................................. 3

IRQ....................................................................................................... 5

Configuring the jumpers ...................................................................... 6

S

OFTWARE REGISTERS.............................................................................. 8

Flag Register........................................................................................ 8

Reset and Load Signal Decoders (RLD).............................................. 8

Counter Mode Registers (CMR) .......................................................... 9

Input/Output Control Register (IOR)................................................. 10

Index Control Registers (IDR)........................................................... 11

CHAPTER 3: TROUBLESHOOTING..................................................12

APPENDIX A: HARDWARE I/O MAP.............................................A-1

I/O M

AP OF XT CLASS MACHINES.......................................................A-1

H

ARDWARE I/O MAP OF AT CLASS MACHINES................................... A-2

APPENDIX B: SPECIFICATIONS/TIMING DIAGRAMS............. B-1

IN DESCRIPTION.................................................................................B-1

P
A

DDRESSES........................................................................................... B-1

T

RANSIENT CHARACTERISTICS............................................................. B-2

Quadrature Mode............................................................................. B-2

Non-Quadrature Mode..................................................................... B-2

APPENDIX C: TYPICAL SET-UP EXAMPLES..............................C-1

2IQEC2/43798 Manual Table of Contents i

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Chapter 1: Introduction

The 2IQEC2/4 is a 2/4 channel quadrature encoder 24 bit
counter card used to track the position of up to 4 separate
encoders. This card is an ISA card that can be used in either an 8
or 16 bit slot. This card allows the computer to keep track of
position without a lot of CPU overhead, freeing it up for more
important tasks.

The 2IQEC2/4 offers a huge amount of flexibility. Upon a
borrow or carry the card can be configured to reset, load a preset,
cause an interrupt request or simply send out a TTL signal to
indicate the carry or borrow. The card contains two inputs that can
be configured to clear the counter or load the preset into the
counter. The index lines may also be used to clear the counter,
load the preset or cause an interrupt. The four channels use IRQ
sharing to prevent all the computer's resources from being taken up
by this card. The interrupt service routine can poll the card to find
out which channel caused the interrupt request.

Packing List

Examine the shipping carton and contents for physical damage.
The following items should be in the shipping carton:

1. 2IQEC2 or 2IQEC4

2. 2IQEC2/4 3.5" disk

3. This instruction manual

If any of these items are damaged or missing contact B&B
Electronics immediately.

Address Switch Setup

The 2IQEC2/4 cards use a 7-position DIP switch to program
the binary I/O address of each port on the card. The 2IQEC2/4
cards are factory configured for address 0x300 with no IRQ. If you
plan on installing the 2IQEC2/4 with these settings, check the switch
settings to ensure that they did not get inadvertently changed during
shipping.

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Specifications

 Bus: IBM PC ISA Bus
 Slot: Requires 1 full length slot for complete IRQ selectability.

When installed in a short slot, IRQs 10-15 will not be available.
The four channel card requires an additional space to mount the
connectors in the back panel. This space does not need a slot
on the motherboard.

 Dimensions: 8.75" x 4.4"
 I/O connection: 15-pin female D-sub connectors
 Interrupt: IRQ 2-7, 10-12, 14, or 15.
 Address: Switch programmable, 0 to hex 7F0
 RS-422 Differential inputs

Differential input high-threshold voltage 0.2V maximum
Differential input low threshold voltage -0.2V maximum
Input differential voltage range 1.5 to 6 volts

 TTL inputs

Input high threshold 2 V Maximum
Input low threshold 0.7 V Maximum
Input voltage range -0.2 to 5.5 volts

 TTL outputs

1 mA source @ 4.375 V
5mAsink@0.5V

 12 MHz count rate in quadrature 4X mode.
 24-bit counters for up to four axes on 2IQEC4

(two axes on 2IQEC2)

 Digital filtering of the quadrature clocks
 Power Consumption

+5 VDC @ 250 mA

(See additional specifications in Appendix B.)

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Chapter 2: Installation

Software Installation

The 2IQEC2/4 comes with a useful example program. This
example program may be used royalty free when used with the B&B
Electronics 2IQEC2/4. Any other use is strictly prohibited. To install
this example file on your hard drive:

1. Place the disk in drive A:

2. Type A: and press the <ENTER> key.

3. Type Install and press the <ENTER> key.

4. Follow the instructions given by the program.

Installing the Card

1. Turn the power to your computer off.

2. Remove the cover of the computer. Be sure to use proper

grounding techniques.

3. Pick any full length (16-bit) unused slot. Although the 2IQEC2/4

cards will work in a short (8-bit) slot, IRQ's 10-15 will not be
available.

4. Remove the expansion slot cover. Save the screw for

installation of the 2IQEC2/4 card.

5. Set the address, IRQ, and other jumper settings. See Card

Settings in the next section for instructions on setting the
address and IRQ.

6. Install the 2IQEC2/4 card into the unused slot. Be certain that

the card is inserted completely into the slot.

7. Secure the card with the mounting screw.

Card Settings

Address

Switch S1 configures the address of the card. Switches
represent a 0 in the ON position, 1 when OFF. The address lines
are labeled on the card. SA10 is the MSB and SA4 is the LSB.
Table 1 shows the numerical weight and electrical connection of
each switch position.

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Table 1. Address Switches

1st Digit 2nd Digit

Switch

7 654321
Position
Bus

SA10 SA9 SA8 SA7 SA6 SA5 SA4

Connection
Decimal

1024 512 256 128 64 32 16

Weight
Hex Weight

400 200 100 80 40 20 10

To set the address of the 2IQEC2/4 card at some common

locations, follow the switch settings shown in Table 2.

Table 2. Frequently Unused Port Addresses

Base
Hex
Address

Binary
Equivalent

Switch
Settings

MSB LSB

I/O Space
Description

7654321

200 1000000000 0100000 game port
300 1100000000 0110000 prototype
310 1100010000 0110001 prototype
380 1110000000 0111000 SDLC
3A0 1110100000 0111010 bisync com

To install at another address, follow the procedure below.

1. Select the address. Using an I/O port usage table (one is

included in Appendix A) select an unused hex address
space. Note that the card occupies 16 bytes of I/O space.
Use caution when selecting a port address. It is very
important that nothing else is installed at the selected
address.

2. Convert the hex address to its binary equivalent.

3. Throw away the 4 least significant bits.

4. The remaining 7 digits represent the switch address. 1's

represent an OFF switch. 0's represent an ON switch.

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IRQ

The 2IQEC2/4 card allows the use of interrupts (IRQ) 2-7,
10-12, 14, and 15. This interrupt is shared with all the channels. To
determine the channel that caused the interrupt, the interrupt
service routine must read the address located at the base address
plus 8. The lower nibble will indicate which channel caused the
interrupt. Where bit 0 is the X-Axis, bit 1 is the Y-Axis, bit 2 is the Z­Axis, and bit 3 is the W-Axis. The upper nibble is not used. To
clear the interrupt, the interrupt service routine must read or write to
the address located at base address plus 12 (0xC). The IRQ is set
by placing a jumper on JP1. Only one jumper should be placed on
JP1 at any one time. Check Table 3 for common interrupt uses.

Table 3. Hardware Interrupts

IRQ AT machines XT machines
2 routed to IRQ controller 2 Reserved
3 serial port COM2,4 Serial port COM2,4
4 serial port COM1,3 Serial port COM1,3
5 LPT2 hard disk
6 floppy disk Floppy disk
7 LPT1 parallel printer port 1 (LPT1)
8 real-time clock not available
9 re-directed to IRQ2 not available
10 Unassigned not available
11 Unassigned not available
12 Unassigned not available
13 Coprocessor not available
14 hard disk not available
15 Unassigned not available

The conditions required to generate an interrupt can be
selected by the use of jumpers. Each axis is independently
configured. Note that more than one condition can be configured to
generate the interrupt. Note that the use of an interrupt is not
required.

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