Allen-Bradley 1784-KTXD Reference guide

Brand: Allen-Bradley

Model: 1784-KTXD

Type: Reference guide

This manual is also suitable for

1784KTx Scanner

(Catalog Nos. 1784-KTX, -KTXD, and -KTS)

Reference Manual

Allen-Bradley Parts

Because of the variety of uses for the products described in this

publication, those responsible for the application and use of this control

equipment must satisfy themselves that all necessary steps have been taken

to assure that each application and use meets all performance and safety

requirements, including any applicable laws, regulations, codes and

standards.

The illustrations, charts, sample programs and layout examples shown in

this guide are intended solely for purposes of example. Since there are

many variables and requirements associated with any particular

installation, Allen-Bradley does not assume responsibility or liability

(to include intellectual property liability) for actual use based upon the

examples shown in this publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application,

Installation, and Maintenance of Solid State Control (available from your

local Allen-Bradley office), describes some important differences between

solid-state equipment and electromechanical devices that should be taken

into consideration when applying products such as those described in this

publication.

Reproduction of the contents of this copyrighted publication, in whole or

in part, without written permission of Allen-Bradley Company, Inc., is

prohibited.

Throughout this manual we use notes to make you aware of safety

considerations:

ATTENTION: Identifies information about practices or

circumstances that can lead to personal injury or death, property

damage or economic loss.

Attention statements help you to:

identify a hazard

avoid the hazard

recognize the consequences

Important: Identifies information that is critical for successful application

and understanding of the product.

Important User Information

About This Manual P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Objectives of This Manual P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audience P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

About the Examples P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Publications

P2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Understanding I/O Scanner Concepts 11. . . . . . . . . . . . . . . .

Chapter Preview 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How Does the Scanner Relate to I/O 11. . . . . . . . . . . . . . . . . . . . . .

I/O Addressing 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What the Scanner Does 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Modes 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dualport

RAM

17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Host

Responsibilities

18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What's

19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Startup and Shutdown 21. . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Preview 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the KTx Memorymapped Hardware 21. . . . . . . . . . . . . . . . . .

Running Diagnostics on the KTx Card 23. . . . . . . . . . . . . . . . . . . . .

Running

the Host Compatibility T

est 27. . . . . . . . . . . . . . . . . . . . . . .

Loading the Protocol File 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Initialization 212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shutdown 214. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What's

214. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Programming Overview 31. . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Preview 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dualport Layout 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adapter

Status T

able 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O Image Tables 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Command Interface 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Confirmation Handshaking 33. . . . . . . . . . . . . . . . . . . . . . . . . . .

Handling Host Interrupts 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing and Enabling the Interrupt 35. . . . . . . . . . . . . . . . . . . . . . .

Writing the Interrupt Service Handler 36. . . . . . . . . . . . . . . . . . . . . .

What's

38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

Allen-Bradley Parts

Table of Contentsii

Issuing Scanner Management Commands 41. . . . . . . . . . . . .

Chapter Preview 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Basic Command and Confirmation Structures 41. . . . . . . . . . . . . . . .

Host Commands 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What's

412. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Issuing Blocktransfer Commands 51. . . . . . . . . . . . . . . . . . .

Chapter Preview 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How Block Transfer Works 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adapter Decide Length (ADL) 52. . . . . . . . . . . . . . . . . . . . . . . . . . .

Host BT Write 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Host BT Read 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Time

to Completion

59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unsolicited Block Transfer 510. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What's

510. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reporting KTx Scanner Status 61. . . . . . . . . . . . . . . . . . . . . .

Chapter Preview 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Status Word 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adapter

Status T

able 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

KTx Hardware Status Register 66. . . . . . . . . . . . . . . . . . . . . . . . . .

Using the LEDs as Status Indicators 66. . . . . . . . . . . . . . . . . . . . . .

Exception/Error Handling 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What's

69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Understanding Discrete I/O 71. . . . . . . . . . . . . . . . . . . . . . . .

Direct Image Table Access 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

To access a single input terminal, 72. . . . . . . . . . . . . . . . . . . . . . . .

set a single output terminal,

72. . . . . . . . . . . . . . . . . . . . . . . . . .

To reset (clear) a terminal is a little trickier; 72. . . . . . . . . . . . . . . . . .

Timing

of Discrete I/O

73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input Change of State (COS) Detection 76. . . . . . . . . . . . . . . . . . . .

Interrupt at End of Scan List 77. . . . . . . . . . . . . . . . . . . . . . . . . . . .

What's

77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dualport Layout A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix Preview A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Programming Examples B1. . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix Preview B1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

About the Examples B2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents iii

KTx Hardware Registers C1. . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix Preview C1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Glossary D1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix Preview D1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Support Services 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Allen-Bradley Parts

Preface

P-1

About This Manual

Use this document to understand, program, and employ the scanner

function of the 1784-KTX, 1784-KTXD, and 1784-KTS Communication

Interface cards.

In this document, we refer to the 1784-KTX, 1784-KTXD, and 1784-KTS

cards collectively as “1784-KTx” or “scanner.”

To use this product effectively, you must be familiar with:

C programming

Allen-Bradley programmable controllers

We wrote this document for application programmers.

We use these conventions in this manual:

command names look like this: Set Mode

variables and function names look like this: get_scan_list

program constants and macros look like this: SUCCESS or

INIT_IN_PROGRESS

We designed the examples in this manual to introduce the application

programmer to the host-to-KTx interface and commands. The examples

demonstrate all of the host-to-KTx commands as well as other common

tasks, such as:

reading and writing the I/O image tables

reading the status table

start-up and shutdown

watchdog timer

Unlike a typical application program, these example programs are not

designed to take advantage of the KTx’s ability to interrupt the host when a

host-to-KTx command reaches completion. Some commands, such as

block transfers, are given 4 seconds by the KTx to complete their tasks

before the KTx declares a timeout error. For most applications it would be

impractical to suspend processing for this length of time.

Objectives

of This Manual

Audience

Conventions

About the Examples

Preface

About This Manual

P-2

Source code for an interrupt service routine has been included to

demonstrate how an application might handle KTx interrupts. The interrupt

service routine has not been integrated with the rest of the example source

code. That task has been left to the application programmer.

Publication Title Pub. No.

1784KTx Dualport Interface Specification Reference Manual

17846.5.21

1784KTx Communication Interface Card User Manual 17846.5.22

1784CP12 Cable Packing Data 17842.41

1784CP13 Cable Packing Data 17842.44

I/O Concepts Manual for Industry Bus Products 6008-6.5.1

Data Highway/Data Highway Plus/Data Highway II/

Data Highway485 Cable Installation Manual

17706.2.2

Publications

Allen-Bradley Parts

Chapter

1-1

Understanding I/O Scanner Concepts

This chapter explains basic concepts and provides an overview of the

operation of the PC I/O scanner. After reading this chapter you should

understand how:

information moves between your program and the outside world

your program can issue commands to affect operation of the scanner

The scanner uses the remote I/O protocol to communicate with

Allen-Bradley I/O modules. You don’t have to know the specifics of the

protocol to use the scanner with the I/O modules, but you do need to know

a few terms.

The scanner is an Allen-Bradley communication card, which requires a

16-bit backplane, that you install in a compatible host computer (or host).

PC Hardware

Host

I/O Protocol

1784KTx

I/O Hardware

Processor

(e.g., 80486)

Remote I/O

Module

Chapter

Preview

How Does the Scanner

Relate to I/O

Chapter 1

Understanding I/O Scanner Concepts

1-2

I/O modules sit in one or more chassis. An I/O chassis is a housing that

holds one adapter and as many as 16 I/O modules. The adapter is the

communication interface between the scanner and the chassis. The scanner

communicates with the adapter through Allen-Bradley-approved cable.

In turn, the adapter monitors and controls the I/O modules through the

backplane of the chassis. You can combine chassis in any way that results

in as many as 32 adapter addresses.

Host

KTx Scanner

Remote I/O Cable

Adapter

I/O Chassis

14652

Processor

Adapter

I/O Chassis

I/O chassis can contain 8bit, 16bit, or 32bit

discrete I/O modules, analog, and/or intelligent

I/O modules.

EISA/ISA Bus

We can divide I/O, and therefore I/O modules, into discrete and

intelligent modules.

Allen-Bradley Parts

Chapter 1

Understanding I/O Scanner Concepts

1-3

Discrete I/O is characterized by one terminal (or point) per I/O image table

bit. Your program handles discrete I/O through I/O image tables, where

each input or output terminal corresponds to one of the 4096 input and

4096 output image table bits (256 x 16 bits = 4096 bits).

The input image table is an area of memory that monitors the terminals of

discrete input modules. When an input switch is closed, the corresponding

bit is set to 1. The output image table is an area of memory that controls

output terminals of output modules. After a bit is set to 1, the

corresponding switch is closed or the terminal is energized.

A standard-density module is a discrete input or output module that has 4,

6, or typically 8 input or output terminals. A high-density module is a

discrete input or output module that has 16 input or output terminals. A

quad-density module is a discrete input or output module that has 32 input

or output terminals.

Intelligent I/O is characterized by the transmission of one or more 16-bit

words in a particular format to or from an I/O module. A block transfer

(BT) is the transmission of data to or from an intelligent I/O module.

A BT read transfers information (typically analog input and status data)

from the module to the host; a BT write transfers data (typically analog

output and configuration data) from the host to the module.

You assign each adapter an I/O rack number (0 – 31) by setting switches

on the adapter. A logical rack may be a single chassis; or two to four

chassis may comprise one rack number; or a single chassis can be

addressed as two racks. It is not necessary to assign rack numbers

sequentially: for instance, you could have a full rack 0, half a rack in rack

3, and a quarter rack in groups 6-7 of rack 7.

For addressing purposes, each rack is equivalent to a block of 8 I/O groups

in the I/O image table. Groups within a rack are numbered 0 through 7.

An I/O group is two 16-bit words, one from the output image table and one

from the input image table, with the same address. Refer to the I/O

Concepts Manual, publication 6008-6.5.1, for more information. In most

applications, only the input word or only the output word is used in any

given I/O group.

I/O Addressing

Chapter 1

Understanding I/O Scanner Concepts

1-4

Here is an example layout of the output image table showing the first

8 racks:

Group

word #

(hex) rack

0 1 2 3 4 5 6 7

00-07 0 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

08-0F 1 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

10-17 2 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

18-1F 3 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

20-27 4 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

28-2F 5 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

30-37 6 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

38-3F 7 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

The word numbers above can be used as subscripts. (We’ll look closely at

that in chapter 6, Discrete I/O.) Each 16-bit word corresponds to 16

discrete I/O terminal positions, terminal 17 octal (15 decimal) to the

high-order bit and terminal 00 to the low-order bit.

Just as each I/O group has an address, so does each adapter. Adapter

addresses are used in the scan list (see page 1-6, What the Scanner Does).

The adapter address is the address of the first I/O group covered by the

adapter, divided by 2. This is numerically the same as (rack x 4) + (starting

group / 2), where the rack and group are both numbered from 0 through 7

as shown above. If you prefer, you can think of 1/4 racks being numbered

from 0 through 3, and then the adapter address is (rack x 4) + (quarter).

A slot is a position in an I/O chassis for one I/O module. In 1-slot

addressing, an I/O group represents a single slot. In 2-slot addressing,

an I/O group represents two slots.

Logical Rack / Starting Quarter and Link Addresses

Adapter link addresses are composed of a rack number concatenated with a

starting quarter for a given rack. The two low-order bits of the address are

the starting quarter of the rack, and the next 5 bits are the rack address.

The high bit is always zero when using the KTx.

Example: rack 7, starting quarter 3 has a link address of 00011111binary,

or 1F hexadecimal. In viewing the binary representation, the address

breaks down as follows: 0 – 00111 – 11. The high order bit is 0, the rack

address is 00111, and the starting quarter is 11.

Examine the examples on page 1-5.

Allen-Bradley Parts

Chapter 1

Understanding I/O Scanner Concepts

1-5

This

physical rack assumes 2 link addresses and

contains 3/4 of logical rack 2 and 1/4 of logical rack 3.

Rack 2 Rack 2 Rack 2 Rack 3

Quarter 2 Quarter 3 Quarter 4 Quarter 1

Link address

09H

Link address

0CH

Full rack starting in first I/O group" 1

(second quarter) of rack number 2,

using 2slot addressing.

Here

2 physical racks, each with a link address,

comprise 3/4 of logical rack 4.

Link address

10H

Link address

11H

Rack 4

Quarter 1

Rack 4

Quarter 2

Rack 4

Quarter 3

Quarter rack starting in first I/O group" 0

(first quarter) of rack number 4, using

2slot addressing.

Half rack starting in first I/O group" 1

(second quarter) of rack number 4.

This

physical rack assumes 2 link addresses and

contains 2 full logical racks, 7 and 8.

Rack 7 Rack 7 Rack 8 Rack 8

Quarter 1,2 Quarter 3,4 Quarter 1,2 Quarter 3,4

Link address

1CH

Link address

20H

Full

rack starting in first I/O group" 0

(first quarter) of rack number 7, using

1slot addressing

Chapter 1

Understanding I/O Scanner Concepts

1-6

Address Conversion

You can use the following macros to quickly perform conversions between

link and logical addresses and back again. The parentheses are necessary

to ensure operations are performed in the right order.

Link-to-Logical Address Conversion

To convert a link address to a logical address, shift right twice.

#define LINK_TO_LOGICAL(link,logical) ((logical)=((link)>>2))

Logical-to-Link Address Conversion

To convert a logical address to a link address, shift left twice and add the

starting quarter.

#define LOGICAL_TO_LINK(link,logical,sq) ((link)=(((logical)<<2)+sq))

Address Range

The 1784-KTx scanner will service as many as 32 logical racks (32

physical node addresses) with a maximum of 4096 discrete inputs and

4096 discrete outputs.

The scanner runs asynchronously in relation to the host, a personal

computer. When either one wants to get the other’s attention, it must issue

a hardware interrupt. Information is exchanged through dual-port RAM.

Both the host and the scanner can postpone servicing an interrupt if in the

middle of another interrupt-driven task.

The scanner maintains a scan list, which is a list of adapters to be serviced

by the scanner. A given adapter may appear once, several times, or not at

all in the scan list. The scan list is empty until you perform the scanner

commands to

Autoconfigure or Set Scan List.

An exchange (or an adapter scan) is the scanner’s interchange of

information with one adapter. During an exchange, the scanner may

receive data or status information from the adapter or send data or

commands to the adapter, or both. Both block transfers and discrete I/O

transfers can be done during the same exchange if the adapter’s chassis

contains both kinds of I/O modules.

The host issues commands by writing to the dual port. The scanner

services commands as they arrive. If the current operating mode allows,

the scanner executes the command. If the scanner has a confirmation of

this command or of a previously executed command, it puts the

confirmation in the dual-port RAM and interrupts the host.

What

the Scanner Does

Allen-Bradley Parts

Chapter 1

Understanding I/O Scanner Concepts

1-7

The scan list is circular: each time the scanner reaches the end of the scan

list it starts again at the beginning. An I/O scan (sometimes called just a

scan) is one complete cycle by the scanner through the scan list, from any

point to the same point. Thus you can be certain that the I/O image tables

are refreshed once per cycle through the scan list.

The scanner has three modes of operation: Program, Test, and Run modes.

Discrete inputs are read in all three modes.

In Program mode, no discrete outputs are sent to the adapters, and the

adapters are instructed to hold all discrete outputs reset (zero).

The scanner holds any block transfer requests in its queue without

servicing them.

In Test mode, the adapters are still instructed to hold discrete outputs

reset, but the scanner sends discrete information to them. Block transfers

can proceed in test mode, but their outputs will be held reset.

In Run mode, discrete output information is sent to the adapters, and the

adapters are permitted to update the output modules. Block transfers

may be performed.

No link activity occurs until you send an

Autoconfigure or Set Scan List

command. Then, when your program begins scanner operation, the scanner

is in Program mode. Your program must issue a command to change to

Run mode.

Dual-port RAM gives you almost 100% access to the interface at all times,

therefore your entire operation runs more quickly. The only time you will

be denied access is when the host and the KTx try to access the same

memory location at exactly the same time.

DATA

ADDRESS

DATA

ADDRESS

Host

processor

Dualport

RAM

memory

KTx

processor

KTx card

Operating

Modes

Dualport RAM

Chapter 1

Understanding I/O Scanner Concepts

1-8

The KTx scanner has built-in collision detection; an arbitrator governs

traffic in the dual-port RAM. When the KTx processor and the host

processor try to access the same dual-port RAM location simultaneously,

the processor that made the first request receives access.

The host has two primary responsibilities; it:

changes and monitors the flow of discrete data

issues scanner commands

Data Flow and Data Paths

Here is the path followed by a discrete input bit:

An external device causes an input terminal of a discrete input module

to turn “on.”

When next asked by the adapter, the input module reports the new input

information. The adapter updates its internal input image table by

setting the bit corresponding to the particular input point.

When next scanned by the scanner, the adapter reports the new input

information. The scanner updates the input image table in the dual-port

RAM by setting the bit corresponding to the particular input point.

Host may read the dual port (discrete data) at any time.

The path of an output bit is essentially the reverse of the input path:

Your program sets a bit in its output image table. Your program knows

that this bit maps to an output terminal on a particular output module.

When the scanner next scans the adapter controlling the particular

output module, it tells the adapter to update its output image table with

the new information.

The adapter tells the discrete output module to update its outputs with

the new information.

The discrete output module turns on the output. Any external device

attached to the output module then becomes active.

For timing information, see Timing of Discrete I/O in chapter 7,

“Understanding Discrete I/O.”

Host

Responsibilities

Allen-Bradley Parts

Chapter 1

Understanding I/O Scanner Concepts

1-9

Scanner Commands

As its second primary responsibility, the host issues these types of

scanner commands:

management commands

block-transfer commands

A management command affects the operation of the scanner itself. There

are five management commands:

Command Action

Set

Mode

changes the scanner's operating mode to Program,

Test, or Run mode

Autoconfigure goes on the link to see what devices are attached

Set Scan List changes the order in which adapters are scanned,

and their relative frequency

Get Scan List obtains a copy of the current scan list

Set Fault Dependent Group designates one or more groups of adapters such

that, if one adapter in a group is faulted, the

scanner instructs the others to be faulted also

The command/confirmation buffers are used to transfer scanner

management commands to the scanner and provide status information to

the host. In addition, this area of the dual-port RAM is used for block

transfers between the host and intelligent I/O devices in the I/O system.

Refer to chapter 4 for information about management commands.

There are two block-transfer (BT) commands:

Command Action

Host BT Read reads data from an intelligent I/O module and

returns data to the host

Host BT Write writes data supplied by the host into an intelligent

I/O module

Refer to chapter 5 for information about block transfers.

Chapter 2 describes scanner start-up and shutdown procedures.

What's

Chapter

2-1

Startup and Shutdown

This chapter describes the start-up and shutdown phases of operation,

including:

using the KTx memory-mapped hardware

running diagnostics on the KTx card

running the host compatibility test (M16 diagnostics)

loading the protocol file

initialization

shutdown

Before you begin building your driver, you must be familiar with the KTx

card’s memory-mapped hardware. The following sections describe

memory-mapped hardware bytes :0800h through :080Fh, which may be

needed by your driver.

Assert (Release) Z80 (byte :0802h)

Write a 01h to this address to assert (release) the Z80 and begin execution

of the loaded binary file. Subsequent writes to this address while the Z80

is asserted will have no effect.

Deassert (Reset) Z80 (byte :0803h)

Write a 01h to this address to de-assert (reset) the Z80 and halt execution

of the loaded binary file. Subsequent writes to this address while the Z80

is de-asserted will have no effect.

Chapter

Preview

Using the KTx

Memorymapped Hardware

Allen-Bradley Parts

Chapter 2

Startup and Shutdown

2-2

KTx Status Register (byte :0804h)

Important: This is a read-only byte.

This byte reports the status of several properties of the KTx card.

This table describes what each bit contains.

Bit Status Code Meaning

7 0 = Z80 is deasserted

1 = Z80 is asserted

6 0 = Z80 is in the halt state

1 = Z80 is not in the halt state

5 0

4 0

3 0

2 0

1 0

0 0 = no hardware interrupt is currently asserted

1 = a hardware interrupt is currently asserted

(stays active till host writes 0x1 to 808)

Host Interrupt Acknowledge (byte :0808h)

Write a 01h to this address to acknowledge an interrupt from the KTx.

This will reset bit 0 of the status register.

Card Control Write Register (byte :080Ah)

Important: This is a write-only register.

Bit Status Code Meaning

7 unused

1 1 = puts the KTx into E/ISA 16bit mode; will not work

with 8bit devices in the same 128K block of memory

0 = extended 16bit mode; can mix 8 and 16bit devices;

0 is the default.

0 1 = E/ISAlevel interrupts

0 = edgetriggered interrupts; 0 is the default.

Chapter 2

Startup and Shutdown

2-3

Card Control Read Register (byte :080Ch)

Important: This is a read-only register.

Bit Status Code Meaning

7 state of LED

1 = on

0 = off

6 color of LED

1 = red

0 = green

5 blink state of LED

1 = blink

0 = no blink

4 reserved

3 baud rate

00 = 230.4K baud

01 57 6K baud

01 = 57.6K baud

10 = 115.2K baud

11 = 230.4K baud

1 1 = puts the KTx into E/ISA 16bit mode; will not work

with 8bit devices in the same 128K block of memory

0 = extended 16bit mode; can mix 8 and 16bit devices;

0 is the default.

0 1 = E/ISAlevel interrupts

0 = edgetriggered interrupts; 0 is the default.

When you cold boot the host PC, you also restart the KTx card and place it

in a reset state. At this point, the KTx card is ready for your driver to start

the power-on self-diagnostic tests before loading the protocol binary file to

the KTx card.

Important: Since the self-diagnostic tests execute from the dual port,

you must run the dual-port functionality test before you run any of the

self-diagnostic tests.

Dualport Functionality Test

To check the functionality of the dual-port interface, follow these steps:

1. Clear the dual-port memory by writing 00h to dual-port locations

:0000h through :07FFh.

2. Read and check :0000h through :07FFh for compliance.

Running

Diagnostics

on the KTx Card

Allen-Bradley Parts

Chapter 2

Startup and Shutdown

2-4

3. Write FFh to dual-port locations :0000h through :07FFh.

4. Read and check :0000h through :07FFh for compliance.

Three Poweron Selfdiagnostic Tests: RAM, CTC, and SIO

Your driver must run these three power-on self-diagnostic tests (and they

must be performed in this order):

1. Random Access Memory (RAM) Test — file KTXST0.BIN

This test performs a pattern write to all of RAM and verifies this with

a read cycle. The test order is RAM1, RAM0, Dual-port RAM.

2. Counter Timer Circuit (CTC) Test — file KTXST1.BIN

This program performs a timing test on all KTx card CTC channels.

3. Serial Input Output (SIO) Test — file KTXST2.BIN

This program performs a loopback test on the KTx card SIO.

Table 2.A shows the diagnostics memory map associated with these tests.

Table 2.A

Diagnostics

Memory Map of Dual Port

Host Dualport Address Dualport Contents

:0000h - :07FDh

KTXST0.BIN or

KTXST1.BIN or

KTXST2.BIN

:07FEh Status Code

:07FFh Done

These bytes are memory-mapped hardware addresses:

:0800h Reserved

:0801h Interrupt KTx by writing a 1

:0802h Assert (Release) Z80

:0803h Deassert (Reset) Z80

:0804h KTx status register

:0805h - :0807h Reserved

:0808h Ack KTx interrupt by writing a 1

:080Ah Card Control Write Register

:080Ch Card Control Read Register

RAM

CTC

SIO

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Allen-Bradley 1784-KTXD Reference guide

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Model: 1784-KTXD

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