Hp 82718a User manual

HEWLETT-PACKARD

HP

82718A

Expansion

Pod

Reference

Manual

For

use

with

the

HP-75

* * *

HP-75

:

:f::

:t:

:*:

e*

Printed

in

U.S.A

F'ihl

HEWLETT

~~

PACKARD

HP

82718A

Expansion

Pod

Reference

Manual

For

Use

With

the

HP-75

July

1984

82718-90001

Printing

History

Edition

1

...........................................................................................................................................................

July

1984

NOTICE

The

information

contained

in

this

document

is subject

to

change

without

notice.

HEWLETT-PACKARD

MAKES NO WARRANTY OF

ANY

KIND WITH

REGARD

TO THIS

MATERIAL, INCLUDING, BUT NOT LIMITED TO,

THE

IMPLIED WARRANTIES OF

MERCHANTABILITY

AND

FITNESS FOR A PARTICULAR PURPOSE.

Hewlett-Packard

shall

not

be liable for errors contained

herein

or

for

incidental or consequential damages in connection

with

the

furnishing,

performance

or use of this material.

Hewlett-Packard

assumes no responsibility

for

the use or reliability of its

software

on

equipment

that

is

not

furnished by

Hewlett-Packard.

This document contains

proprietary

information

which

is

protected

by copyright. All rights are

reserved. No

part

of this

document

may be photocopied, reproduced or

translated

to

another

language

without

the

prior

written

consent

of

Hewlett-Packard

Company.

HEWLETT-PACKARD

COMPANY

I

•

r

84

• •

Section 1

INTRODUCTION

HP

82718A

Hardware.

Built-In

Modem .

Electronic Disc . . .

HP

8271 8A

Software

.

High-Level

Modem.

Low-

Level Modem .

Electronic Disc . . .

Bar Code

.....

.

Installing

the

HP-7

5

Into

the

HP

827l8A

Connecting

and

Disconnecting

the

Wand.

Using

the

Built-In

Modem

........

.

Notifying

the

Telephone

Company.

. .

Contents

Connecting

and

Disconnecting

the

Telephone

Line.

Telephone

Company

Rights

and

Responsibilities.

Identifying

Problems.

How

to Use This

Manual.

.............

.

Section 2

SOFTWARE

USAGE

AND

EXAMPLES

Overview

of

Modem

Operation

.....

.

Adapting Existing

Programs

to

Use

the

Modem

Core

Input

and

Output

Commands

Device-Specific

Command

Syntax.

Status

Conditions

. . . . . .

Modem Power . . . . . . . .

Additional

Modem

Features.

High-Level Modem

Software

Initializing

the

Modem

.....

Turning

the

Modem

On.

. . . .

Detecting

Connection

With

a Host

Computer

Reading Modem Responses . . .

MODOUT

and

Echoed

Data

..

MODOUT

and

Out

of

Memory.

Retransmitting

Received

Data

Terminal

Program

. . . .

Low-Level

Modem

Software

Modem Modes. . . .

Modem

Parameters

.

Default

State.

. . .

Modem Responses. .

Low-Level Modem

Command

Syntax

Software

Handshake

Protocol.

ENQ/

ACK Protocol .

XON/XOFF

Protocol

Prompt

Mode. . . .

Combined Protocols .

7

8

· 10

·

11

· 12

12

· 12

·

15

· 16

· 17

· 18

· 19

.20

.22

.23

.24

.27

.28

.29

· 30

.30

·

31

·

32

·

32

·

32

· 33

Buffer

Control

..

Modem Deadlock .

Adaptive

Dialing.

Adaptive

Dialing Using

the

DIAL Command.

Adaptive

Dialing Using Modem Responses.

Dial Strings for

Adaptive

Dialing.

Tone Dial

String.

.

Pulse Dial

String.

. . . . . . .

Total Dialing Time

......

.

Using a Telephone as a Line

Monitor.

Man

ual

Dialing.

. . . . . . . . . . .

Connecting

Two Pods

Back-to-Back

.

Auto-Answer

............

.

Monitoring

a Dialing Operation . . .

Uploading a Text File to a Host

Computer.

Command,

Data,

and

Response Echoing

Sending

Command

Characters

as

Data.

Decoding

the

QUERY Response . . . .

Electronic Disc Software. . . . . . . . . .

Adapting

Existing Programs

to

Use

the

Electronic Disc

Initializing

the

Electronic

Disc.

Interaction

With

the

I/O

ROM.

Hierarchical

File

Structure.

Directory

Levels . . . . . .

Pathnames

........

.

Wild

Cards

in

Pathnames

Examples of

Pathnames

Comprehensive Example

..

Bar Code

Software.

. . . . . .

Scanning a Bar Code

Label.

Using

Audible

and Visual

Prompts.

Checking

Field

Length

.

Verifying

Check

Digits.

Comprehensive Example

Section 3

KEYWORD DICTIONARY

Section 4

LOW-LEVEL

MODEM COMMAND DICTIONARY

Appendix A

OWNER'S INFORMATION

Serial

Number

.....

Environmental

Limits.

Operating

Precautions.

HP 82

718A

Specifications.

General

Specifications .

Contents r (

·

33

·

34

·

34

•

·

35

·

36

·

37

·

37

·

38

·

38

·

38

·

39

·

40

·

41

·

42

·

43

·

45

·

45

·

47

·

49

·

49

·

50

·

51

·

51

·

52

·

52

·

53

·

53

·

54

•

·

56

·

56

·

56

·

57

·

57

·

58

·

93

·

93

.93

~.

·

94

·

94

I

~nts

33

34

35

36

37

38

39

W

~

1

:2

3

5

7

9

~

)

I

a.

Contents

Modem Specifications

...

Electronic Disc Specifications.

Bar Code Specifications.

Power Supply

Information.

Power Consumption. . .

Low Battery Safeguards.

Battery Recharging

...

Replacing

the

Battery

Packs

Rechargeable

Battery

Care.

General Cleaning

Information.

Verifying Proper

Operation.

Limited

One-Year

Warranty

What

We

Will

Do.

. . . .

What

Is

Not

Covered . . .

Warranty for Consumer Transactions in

the

United

Kingdom.

Obligation

to

Make Changes

Warranty

Information

............

.

Service

......................

.

Obtaining Repair Service

in

the

United

States.

Obtaining Repair Service in Europe

International Service

Information

Service Repair

Charge

Service

Warranty.

. .

Shipping Instructions .

Further

Information

.

Potential for Radio/Television

Interference

(U.

S.

A.

Only)

When You Need Help

..................

.

Appendix B

ACCESSORIES INCLUDED WITH

THE

HP

82718A

Appendix C

KEYWORD

TAKEOVER

AND DUPLICATE KEYWORDS

Keyword Takeover by

the

HP 8271 8A

Abbreviating Keywords .

System Configuration

Duplicate

Keywords.

. .

Appendix D

HP

82718A

ERRORS

AND RESPONSES

Alphabetical

Error

Listing

........

.

Numerical

Error

Listing

and

Descriptions.

Alphabetical Response

Listing.

. . . . . .

Numerical Response Listing

and

Descriptions.

Exact Sequence of Response

Characters.

Command String Echoing.

Dial String Echoing. . . . . . . . . .

.94

·

95

.95

·

95

.96

.97

·

98

.98

·

98

.99

100

101

102

103

104

107

108

109

111

113

115

116

Appendix E

KEYWORD

AND

COMMAND

SUMMARY

High-Level

Modem Keywords.

Low-Level Modem Commands

Electronic Disc Keywords .

Bar Code Keywords . . . . . .

Contents J

•

117

118

119

120

•

nts

17

18

~9

~O

I •

~1_NT_R_O_D_U_C_TI_O_N

______________

~lr~!HI,

Congratulations on

your

purchase of

the

HP 82

718A

Expansion Pod. This device attaches directly to

an

HP-7S portable

computer

and enhances its abilities as a powerful tool

for

portable

data

collection

applications. This

introductory

section of the

manual

will highlight some

of

the

key features

and

capabilities you now have

at

your fingertips.

HP

82718A

HARDWARE

The

combination

of

the

HP

82718A

with

your

HP-7S

is

a single, rugged,

integrated

package

with

data

communications capability and a large memory for program and

data

storage. The HP

82718A

connects

to

the

right-most

ROM

port

on

the

front

of

your

HP-7S,

leaving two ports available

for

up to 64 kbytes

of

your ROM-based application software.

Built-In

Modem

The

built-in

modem is a

direct-connect

300

baud

modem compatible

with

Bell

103/113

modems.

It

has

originate, answer,

and

auto-answer

capability,

and

can

dial

manually

or

automatically

using

either

tones

or

pulses.

The modem supports

both

XON/XOFF

and

ENQ/

ACK handshake protocols,

and

several

parity

options

(odd,

even, always I, always

0,

or none). Two modular RJ

11

jacks enable you to use

the

modem as

an

auto-dialer or use a telephone

as

a line monitor.

Electronic Disc

The

HP

82718A Option

032

or 064 provides

either

32

or

64

kbytes

of

additional

random

access memory

(RAM).

This additional RAM simulates a mass storage device such as a digital cassette

or

disc drive.

Unlike a mechanical device, however, you get fast

data

transfer

and

rugged, reliable operation.

HP

82718A

SOFTWARE

The

HP

82718A contains 16 kbytes of ROM-based software

that

provides 34 new BASIC keywords to

the

HP-7S's already powerful BASIC language, plus

22

commands

that

control

the

modem. These

S6

commands give

the

HP-7S

the ability to send

data

to

and

receive

data

from

the

modem, copy files

into

and

out of the electronic disc,

and

decode two types of

bar

code labels.

The

software

is

divided into

four

functional areas, described below.

High-Level

Modem

The

high-level modem software consists of

11

BASIC keywords

that

provide

the

ability

to

turn

the

modem

on and off,

transmit

strings to

and

from

the

modem, and check

the

status of

the

modem. Strings

sent to

the

modem

can

contain

data, low-level modem commands, or both.

7

,

Introduction

Low-Level

Modem

The

low-level

modem software consists

of

22 commands, all

transmitted

to

the modem via

the

high-level.

modem software. These commands directly control such modem operations

as

dialing, changing

modem

operating

modes,

and

setting handshake protocol

and

parity.

Electronic

Disc

The

electronic disc software consists of 17 BASIC keywords

that

allow

the

RAM

to

simulate a

mass

storage device. These keywords provide

the

ability to create, access,

and

modify text

and

data

files,

establish a

hierarchical

file

structure,

and copy files into and

out

of

the

electronic disc.

Bar

Code

The

bar

code

software

consists

of

6 BASIC keywords

that

allow

the

HP-7SD

to

decode Code 39 and

Code

11

bar

code labels.

The

commands provide

the

ability

to

scan single labels

with

audible feedback

for

whether

or

not

the

scan was successful. The decoders

can

automatically

verify

the

check digit of a

scanned label

or

of unscannable labels entered

from

the

keyboard.

INSTALLING

THE

HP-75

INTO

THE

HP

82718A

CAUTION

During

this installation, you will have

to

remove

the

battery

pack

from

the

HP-7S.

You

may

wish

to

copy

critical

files

to

a mass storage medium

before removing

the

battery

pack

to

avoid

the

possibility

of

losing

important

information

if

a reset occurs.

You will need only a Phillips

or

Pozidriv screwdriver

to

install

the

HP-7S

into

the

HP 82718A. Here

is

the

installation procedure:

8

1)

Turn

off

the

HP-7

S.

Press

[SHIFT]

[ATTN]

or

type

B'lE [RTN].

2)

Remove

any

plug-in

module or

port

cover

from

the

right-most

ROM

port

on

the

front

of the

HP-7S.

3)

Connect

the

ac

adapter/recharger

to

the

HP-7

S.

4)

Take

off

the

HP-7

5

battery

door

and

remove

the

battery

pack. Save

the

door, as you will need

it

if

you ever remove

the

HP-7S

from

the

HP 82718A.

5)

Take

off

the

HP

82718A

battery

door. Insert

the

HP-75's

battery

pack

into

the

HP 82718A's

battery

compartment.

Be

sure to align

the

contacts

of

the

battery

pack

with

the

spring contacts in

the

compartment.

6)

Replace

the

HP

82718A

battery

compartment

door

and

secure its two latches.

•

I

t.

'eI

m

i,

,

t J

,

7)

Set

the

HP

82718A

right-side

up

so

its

nameplate

is

facing

you. The area

marked

# 1

in

the

photo is

the

battery

box,

and

#2

is

the ROM connector.

8)

Place

the

carrying clips

as

shown. Notice

that

they

are

both

oriented in

the

same direction. If you

do

not

plan to use

the

clips, you do

not

have

to

install them, or you

can

place

them

one

rib

farther

back, and

they

will

be

fully concealed by

the

retainers

that

hold

the

HP

-75

to

the

HP S2

71

SA.

9)

Plug

the

HP S2718A ROM connector securely into

the

right-most

port

on the

HP-75.

Then

set

the

HP-75

down

onto the

battery

box. The

tab

protruding

from

the

bottom

of

the ROM connector slips inside

the

slot

on

the

HP S271

SA

housing.

10)

Holding the

HP-75

securely

to

the

HP S271

SA,

attach

the

two plastic

retainers

to

the

unit

by screwing in

the

six long

screws provided

into

the

six holes on

the

bottom

of

the

HP

S2

71

SA.

Be

sure

the

carrying clips align

with

the

notches on

the

retainers.

Your

HP

8271SA Expansion Pod is now ready for use.

In

trod

uction

. .

• .

'1::

;

~~:::;

2,;;

~

:

.

~

9

Introduction

NOTE

When you first

turn

on

the

HP-75,

you

may

see

either

EPPOF.::

r'loder'l

co

1d st.

.:H-t.

or

E

F.:

0

F.:

:

>=:t'1Et'1

I tH TI

AL

I

ZEd.

These errors

only indicate

that

the

battery

packs need recharging before

they

can

supply

sufficient

battery

power

for

the

modem or electronic disc.

CONNECTING

AND

DISCONNECTING

THE

WAND

1)

Turn

off

the

HP-75D.

Press

[SHIFT]

[ATTN]

ortypeE:\'E

[RTN].

2)

Insert

the

wand's plug

into

the

outlet

on

the

back edge

of

the

HP-75D,

as shown in

the

photo

at

right.

3)

To remove

the

wand,

turn

off

the

HP-75D

and push down on the

button

on

top of

the

plug while

pulling

the

plug out.

USING

THE

BUILT-IN

MODEM

The

HP

82718A

has a

built-in

modem

that

provides

data

communication capability, in

the

United

States,

for

the

HP-7

5 portable computer. This modem connects directly to

the

telephone

line~

system

that

is

superior to

an

acoustic coupler connection.

The

Federal Communications Commission (FCC) requires specific procedures

for

installing

and

operating

equipment

that

uses public communication lines.

Therefore,

you

should

read

this

section

carefully

before

attempting

to

connect

your

modem

to

the telephone line.

Notifying

the

Telephone

Company

The

HP

82718A

is registered

with

the

FCC

for

direct

connection

to

a

standard

single-party

telephone

line; connection

to

pay

telephones

or

party

lines

is

prohibited.

If

you

are

unsure

about

the

suitability

of

your

telephone line,

contact

your

telephone company.

'.

Before you

connect

the

HP

82718A

modem to

the

telephone line

for

the

first time, FCC rules require that ( •

you

notify

your

telephone company. You should tell

them

of

your

intention

to

connect

an

FCC-registered

device to your telephone line. They need to know

the

following information:

10

•

Introduction

• Telephone

number

of the line to which the modem

is

connected

• Manufacturer:

Hewlett-Packard

• Model Number: HP 82718A

• FCC registration number:

AU492X-12571-DM-E

• Ringer equivalence number:

0.8

B

The

FCC registration

number

and

the

ringer equivalence

number

are

located on

the

bottom face

of

your

HP

82718A.

If

you

plan to connect

the

HP 8271 8A to

different

telephone lines,

furnish

the

telephone company

with

a

list

of these numbers

to

avoid notifying

them

every time you move

your

unit.

Notify

the telephone

company

again when

the

HP 8271 8A

is

permanently

removed

from

the

line.

Connecting and Disconnecting

the

Telephone

Line

Turn off the modem before plugging a phone line

into

either

modular jack on

the

HP 82718A. Also

turn

off

the

HP-75

unless

your

application program needs to

prompt

the

user to connect

the

phone line.

The

modem

can be

turned

off

either by

turning

off

the

HP-75,

by executing

t'10DEt'1

OFF, or by executing

IH

IT

I

FI

LIZ

E

":

t'1

I]

Dt'111

.

To

connect

the

modem

to

the telephone network, you will need a cable

with

modular telephone plugs on

both

ends

and

a modular telephone jack.

If

your telephone jack has

four

round

holes, you will need an

adapter plug

that

converts your jack from

four-prong

to

modular. Cables

and

jacks

are

available

from

electronics stores or the telephone company.

If

you

want

to

plug

the

HP 82718A into a modular jack into which a telephone set

is

currently

connected

(that

is,

if you

want

to

replace a telephone

with

the

HP 82718A),

the

telephone should have

the

same

kind

of

modular jack

as

the

modem. Unplug

the

cable from

the

telephone,

then

plug

the

loose end

of

the

cable

into either of

the

two jacks on

the

rear

panel of

the

HP 8271

8A.

The

plugs on the cable

can

be inserted into

the

jacks in only one way.

The

small plastic tab will snap in

when

the plug

is

properly connected. When you pull gently on the cable,

it

should not pull

out

of the jack

until you press

the

plastic tab.

You

may wish

to

share a single wall jack between a telephone set

and

the

HP 8271

8A,

and

use

the

modem

as

an

auto-dialer

for voice communications,

or

the

telephone as a line

monitor

for

data

communications.

You

may do this by purchasing

an

extra cable

with

modular plugs on each end from an electronics or

telephone supply store. Connect one end of

the

extra

cable

to

the

second jack on

the

HP 82

718A

and

the

other end

to

the

telephone,

as

shown in

the

figure. Note

that

you

cannot

simultaneously

carryon

a voice

call and use

the

HP

82718A

modem. However, you

can

listen

to

the HP

82718A

transferring

data

on

the

telephone set.

11

Introduction

PHONE

LINE

~

_____

l~!~:------------+.

PHONE

JACK

TELEPHONE

HP

82718A

Telephone

Company

Rights and Responsibilities

The

circuitry

in

your

HP 82

718A

is

designed

to

protect

both

the

phone line

and

the

modem

from

damage

caused by high voltages,

and

is approved by

the

Federal Communications Commission. However,

the

telephone company has the legal

right

to discontinue service

if

the HP 8271 8A should somehow

cause

harm

to

the

telephone network.

In

this case,

the

telephone

company

will:

•

Promptly

notify

you

of

the

service

interruption.

• Give you

the

opportunity

to

correct

the

situation

that

caused service

to

stop.

•

Inform

you

of

your

right

to

bring a complaint to

the

FCC concerning

the

service

interruption.

The

telephone company

may

make

changes in its facilities

and

services which

may

affect

the

operation of

your

equipment. However, you will be given

adequate

notice

in

writing

to

allow you to maintain

uninterrupted

service.

Identifying Problems

If

you have problems with

normal

telephone calls when

the

HP

82718A

is

connected

to

the

line (but not

in

use), you must

determine

if

the

HP 82718A

is

the

cause. Disconnect your

unit

from

the

phone line.

If

the

trouble

continues,

contact

your

telephone company to have your line checked.

If

the

trouble stops when

the

HP

82718A

is

disconnected, you will need

to

have

your

unit

repaired.

Obtaining

service

is

described in appendix

A.

Do

not

attempt

to service

the

HP 8271 8A yourself. Doing

so

is

a violation

of

FCC rules

and

may result

in

damage

to

the

telephone

network.

HOW

TO

USE

THIS

MANUAL

This

manual

is

written

primarily

as a reference

for

application programmers,

and

not

as

a tutorial. The

examples,

with

a heavy emphasis on programmatic use

of

the

commands available in

the

HP 82718A,

assume

that

you are well-versed in

HP-7S

BASIC language programming

and

the

operation of the

HP-7S.

The

bulk

of

the applications

written

will probably

take

advantage

of

the

data

communications, bar code,

and

large memory provided by

the

combination

of

the

HP-7SD

and HP 8271 8A.

As

such,

the

manual

assumes

that

you understand

data

communications and the uses of

machine-readable

(bar code) labels.

12

I

~.

_.

I

•

~,

,

Introduction

The

application section is Section

2,

"Software Usage

and

Examples".

It

provides

information

about

the

four software categories, and gives examples

of

how

to

use

the

software.

The

main

reference sections

are

Section

3,

"Keyword Dictionary",

and

Section

4,

"Low-Level Modem

Command Dictionary"

and

Appendix

D,

"HP 82

718A

Errors and Responses". Section 3 contains syntax

and

descriptions of

the

high-level modem, electronic disc, and

bar

code keywords. Section 4 contains

syntax and descriptions

of

the low-level modem commands. Appendix D contains descriptions of all

errors

and

responses

reported

by

the HP 827 1

8A.

We

expect

that

it

will

take

some

time

to

become proficient

with

the

concepts and commands presented

here,

through

a combination of reading

the

manual

and

experimenting

with

the

many

features of

the

HP

82718A. Many

of

the

commands can be studied by executing

them

from

the

keyboard

and

observing

the results.

The

low-level modem commands

are

best studied

through

the

use

of

a

terminal

program, as

described

in

Section

2.

Once you gain this expertise, you will be able

to

use

the

HP-75

as

a powerful tool

for

portable

data

collection applications.

13

r

\1

•

j

,.

• j

~SO_F_T_W_A_R_E_U_S_A_G_E_A_N_D_EX_A_M_P_L_E_S_--llrd!iH1'\

This section

of

the

manual

will provide supplemental

information

about

the

operation of the modem,

electronic disc, and

bar

code software, and examples

of

the

use

of

the

software.

OVERVIEW

OF

MODEM

OPERATION

There are two types

of

modem commands provided by

the

HP

827l8A.

High

-level modem commands

are

BASIC

keywords

that

add

to

the

set of commands you can execute

from

the

keyboard or

put

in BASIC

programs. Examples

of

high-level

commands

are

t'1ODEt'1

Ot·~

(turn

on the modem),

t'1ODOUT

(send a

string to the modem),

and

CAF.:F.:

I

EF::?

(check

if

there is a carrier).

Low-level

modem commands

are

commands

that

tell

the

modem to

perform

a specific action. Examples

of

low-level commands are D(dial

a phone number), F (set data

format

or

parity),

and

0 (enter

ORIGINATE

mode). The

HP-7

5 communicates

with the modem

primarily

with two

high-level

modem commands:

t'10DOUT

and

t'10D

HU:. These

BASIC

keywords

are

the

real workhorses

of

the

HP-75/modem

system.

t'10DOUT

sends

data

and

low-level modem commands from

the

HP-75

to

the

modem.

t'1OD

I

t·U::

reads the contents

of

the

modem

receive

buffer

and

returns

that

data

to

the

HP-7S.

In addition, six

other

high-level

modem commands

identify

certain

modem status conditions, such

as

parity

and

framing

errors,

carrier

detected, etc. Below is

a block diagram

of

the

HP-7S/modem

system.

HP

82718A

MODEM

I

MODEM

COMMANDS

I

MODOUT

t

TO

PHONE

LINE

'I

TRANSMIT

BUFFER

I

HP-75

MODIN$

I I

FROM

PHONE

LINE

I

RECEIVE

BUFFER

i

I

MODEM

RESPONSES

1

AVAIL?,

CARRIER?,

FRAME?,

I II

STATUS

HOOK?,

PARITY?,

READY?

When t'10DOUl sends a string

from

the

HP-7S

to

the

modem,

it

places

the

string in

the

8-byte

modem

transmit buffer. The modem

then

examines

the

transmit

buffer

to

see

what

action

it

should take.

If

the

15

Software

Usage

and

Examples

string

is

just data,

the

data

is

transmitted

over

the

phone line.

If

the

string

contains low-level

modem

commands,

the

commands

are

not

transmitted,

but

are

processed locally. t

t'10D

I

t-U:

reads

the

contents of

the

64-byte

modem receive

buffer

and

returns

that

data

as

a string

to

the

HP-75.

When

data

arrives

from

the

phone line,

the

modem places

it

in

the

receive

buffer

for t'lODHU

to

read. When

low-level

commands or

data

from

the

HP-7

5

are

echoed by

the

modem,

the

modem

copies

the

commands or

data

from

the

transmit

buffer

into

the

receive

buffer

for

t'lOD

I

t'~$

to

read. When

the

modem

reports a response

(BUSY,

CONNECT,

etc.),

it

places

the

response

into

the

receive

buffer

for

t'l

0DI

t·~

$ to read.

Adapting Existing

Programs

to

Use the

Modem

Existing programs

that

perform

data

communications

with

the

HP-75

are

designed to

work

with

an

HP-IL

peripheral, such

as

the

HP

82168A

Acoustic Coupler

or

the

HP

82164A

HP-IL/RS-232C

Interface

connected

to

a modem. The modem provided

in

the

HP

82718A

is

not

an

HP-IL

data

communications peripheral;

rather,

it

is a dedicated

internal

device, just as

the

card

reader

is

not

an

HP-IL

mass storage device. Therefore, commands

that

deal

with

HP-IL

peripherals

cannot

be used

for

the modem,

and

loop configurations and loop protocol

are

irrelevant

to

the

operation

of

the

modem.

When changing a program

that

uses

HP-IL

peripherals to one

that

uses

the

modem,

there

are

five areas

that

need attention:

I)

Core

input

and

output

commands

2)

Device-specific command syntax

3)

Status conditions

4) Modem power

5)

Additional modem features

CORE

INPUT

AND

OUTPUT

COMMANDS. Existing programs use

either

Et·HI

0$

and

!::Et·m I 0 from

the

HPILCMDS LEX file (which exists by itself, in

the

HP-75

Data

Communications Pac,

and

in the

HP-75

I/O

ROM),

or

Et·HEF.:

and

OUTPUT (in

the

I/O

ROM only). You need

to

replace those core

input

and

output

commands

with

t'lOD

au

and

t"IODOUT,

respectively. Usually, this

is

a direct,

straightforward

replacement; for example,

D$=EtH10$(

II:

I

111

~

IIUt'~L,

TAD#~

!::DA

II

::'

SEt·m I 0

II:

1111

,

II

Ut'~L

~

LAD#

II

~

D$

from

the

HPILCMDS LEX file,

or

Et·HEF.:

II:

1111

;

D$

OUTPUT 11:11

11

D$

16

•

dem

the

:

~,~

$

,pies

the

for

l

an

32C

:lata

:

an

for

reas

rom

the

;ore

'ect,

Software Usage

and

Examples

from

the

I/O

ROM become

D:t=t'10D

I

~,U

t'10DOUT

D$

DEVICE-SPECIFIC COMMAND SYNTAX. The device-specific commands

that

HP-IL

devices recognize

are

different

than

those used by

the

modem.

The

modem has a set

of

low-level commands

that

are

functionally equivalent

to

HP-IL

remote mode instructions,

but

use a

different

syntax. For example, to

instruct

the

HP

82168A

Acoustic Coupler

to

set even parity,

ENQ/

ACK protocol,

and

clear its buffers,

the

following would be done with HPILCMDS:

SE

t·m

I 0 II: I 1" ,

"U

t·~

L,

F.:

E

t·~,

LAD

# " ,

"P

[1; C1;

P;"

I~

::; E

t·m

I0

"","

t·W

E" , " "

or

with the

I/O

ROM:

REt'10TE

I~

OUTPUT

":

Ii"

II

PO; C

1;

P;"

I~

LOCAL

The

equivalent modem command sequence would be as follows:

t'10DOUT

"~'~F

'::'171':'~~Q"'"

7"

o:~.r·HP$'"

1':'

",

.....

-

,_I

~,~~.:,,'.....

1_

••

_'

",

"

,_I

"

where Qrepresents

control-Q

(~J)

and

§ represents

control-S

(~~).

Other remote mode instructions

are

converted similarly.

The

dIscussion

of

low-level modem command

usage

later in this section and

the

"Low-Level Modem

Command

Dictionary" explain

the

low-level

modem

commands.

Refer

to

the

owner's

manual

for

the

device in question for

information

about

its

remote mode instructions. For convenience,

here

is

a table

that

lists those low-level modem commands

which have equivalent remote mode instructions for

the

HP

82168A

and

HP 82164A.

Low-Level

Remote Mode

Instructions

Modem

Command

HP

82168A

HP

82164A

B

(BREAK)

B B

F

(FORMAT)

P P

K

(KONTROL)

C C,DE,FC,LC,PC,SP

T

(TEST)

T none

Z

(ZAP)

R R

STATUS CONDITIONS.

HP-IL

peripherals

identify

status conditions

with

One

or more status bytes.

The

program takes

different

actions based on

the

value

of

those

status

bytes.

Th~

status

bytes are read

by

requesting status:

17

Software

Usage

and

Examples

!;:;$=Et·nI

0$

( " :

11"

,

"Ut'~L,

TAD#,

!::;!;:;T

II

::.

or

HI

Tn

fr<

hi

S$=!:WOLL$

(

II

:

1111

::.

w1

The

modem

status

is

identified

by

certain

high-level

modem

commands,

by

the

low-level

Q

(QUERY)

Ir

command,

and

by

other

responses

that

the

modem

places

in

the

receive

buffer.

The

A"/A I

L'~',

CAF.:F.:IEF.:?,

FF.:At'1E?,

F'AF.:I

T'l?,

and

F.:EAD\'?

all

have

functional

equivalents

represented

by

the

T

values

of

the

status

bytes. Some

of

the

status

information

reported

by

the

Q

command

and

the

modem

d

responses

have

equivalents

in

the

status

bytes.

Refer

to

the

owner's

manual

for

the

device

in

question

for

t1

information

about

its

status

bytes.

The

areas

of

your

programs

that

detect

and

act

on

status

will

have

to

be

modified

to

use

the

status

reporting

mechanisms

provided

by

the

modem.

Refer

to

the

Sections 3

and

4

and

to

"Reading

Modem

Responses"

later

in

this

section.

MODEM POWER. You

must

modify

the

program

to

turn

the

modem

on

and

off

using

t'10DEt'1

ot·~

and

t'lODEI"l

OF

F.

If

your

program

powers

down

the

loop

(e.

g.,

!;:;Et·m

lOll:

I

111

,

II

Ut'~L,

LAD#,

LPD,

TL+II,

1111),

you

can

replace

that

with

t'10DEt'l

OFF.

The

proper

use

of

t'10DEt'1

ot·~

will be

discussed

in

"Turning

the

Modem

On".

ADDITIONAL MODEM FEATURES.

The

modem

offers

features

that

you

may

want

to

incorporate

into

t

your

program. Dialing,

answering

incoming calls,

detection

of

busy signals, etc.

are

just

some

of

the

new

features

available

to

you. You will need

to

study

the

features

of

the

modem

and

decide

which

of

them

you

want

to

integrate

into

your

application.

•

18 I

1

s

t

y)

.")

..

,

:he

em

for

tus

em

md

D,

.sed

.nto

lew

lem

Software Usage

and

Examples

HIGH-LEVEL

MODEM

SOFTWARE

The

high-level modem software provides

the

ability

to

turn

the

modem

on

and

off,

transmit

strings to

and

from

the modem, and check the status of

the

modem. This section will illustrate

the

use of some of

the

high-level modem commands. (The strings sent

to

the

modem

can

contain

low-level modem commands,

which are described in

the

"Low-Level Command Dictionary"

and

illustrated

later

in this section.)

Initializing

the

Modem

The

HP-7

5 and the modem are initialized independently of each other, just

as

the

HP-75

and

an

HP-

IL

data communication device are initialized independently.

If

the

HP-7

5 is reset (

[SH

I FT] [CTL]

[C

LR]),

the modem

is

not. Similarly,

if

the

modem

is

reset

(ItH

T I

FIL

I ZE

II:

t'1ODt'1"),

the

HP-75

is

not.

The

modem can be reset to its

default

state

by executing I

t·~

I T I

AL

I ZE

II:

t'1ODt'1

11

.

The

modem

software resets the modem automatically

if

there

is

insufficient

battery

power in

the

HP 8271

8A.

Since

this

reset occurred

without

your intervention, you

are

warned

about

the

initialization with

EF.:F.:OP:

ModeM

cold

start.

Turning

the

Modem

On

Turn the modem on by executing

t'10DEt'1

otl

After

you

turn

it

on, you should

wait

about 5s

for

the

modem

to become ready for use while

it

performs a self

-test.

In principle, you can tell

if

the

modem is

ready

by reading

the

modem

input

buffer

with

t'10D

I

tU

until

the

roOK

message

is

received from

the

modem:

10

t'1

0DE

t'1

0

t·~

20

IF

t'lOD

Hl$#

II

~·~OK

II

THEt·~

20

However,

there

are

two pitfalls in using this approach:

1)

The

%OK

message will only be reported

if

the

modem

is

reporting long responses.

If

the

modem

is

reporting short responses when

it

is

turned

on,

%4;,

(%4

followed by a space)

is

the

equivalent

of%OK

(see

appendix

D).

2)

If

modem

is

already

on,

t'10DEt'1

CII··1

has no effect,

and

no

%OK

or

104!

will be reported.

Here

is

a routine

that

will

turn

the modem on,

wait

until

it

is

ready

for

use, and avoid these problems

as

well:

10

MODEM

OFF

~

MODEM

ON

!

Turn

off

the

ModeM

in

case

it

is

on

17

18

!

Look

for

either

%OK

or

%4~

19 I

20 t'l$=t'lOD

Hl$

II!

IF

t'l$#

II

~'~CIf:::

II

At·m t'l$#

II

~A

THEt·~

20

Note

that

line 20

cannot

be the following:

19

----

-

------~--

HP 82718A User manual

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