Tandy DCM-7 Operation Manual

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OPERATION

Cat. No. 26-1394

MANUAL

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TERMS

SOFTWARE

STORES

CUSTOMER

A.

B.

11.

LIMITED

A.

B.

C.
D.

E.

Ill.

LIMITATION

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C.

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IV.

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subject
A.
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F.

G.

V.

APPLICABILITY

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VI.

STATE

The
have

OBLIGATIONS

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copies

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capacity,
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the

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purchase
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within·

thirty
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~~~~~~ti~;

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to

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and

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additional
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limited

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copy

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applicable
All

copyright

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terms

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limitations

owner

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RIGHTS

warranties

other

rights

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CONDITIONS

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USE

INCURRED

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shall

arising

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two

(2)

·years

sales

document

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following

provisions:

otherwise

provided

medium

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use

use

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copies

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and

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manufacture,

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OF

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COMPUTER

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provided

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(4)

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backup

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furnishing

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apply

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purchased

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original

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subjected
the

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to

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original

replacement

of

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retail

store,

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CAUSED

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LEASED,

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FROM

SHACK

BE

OUT

OF

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SALE,

FOR
FOR

and/or

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computer.

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labeled

node

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computer

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extent

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to

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8/85

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to

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if

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a

This

The

equipment

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is in

strict

radio and television reception.

It has been

accordance

in
to

provide reasonable

However,

determined
terference by one

If

this

there

equipment

by

FCC

generates and uses radio

accordance

type

with

is no guarantee

turning

with

tested and found

the

specifications

protection

does cause interference

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equipment

or

more

of

Wants

the

manufacturer's

to

against such

that

interference

off

the

following

frequency

You

instructions,

comply

with

in Subpart J

and on, the user is encouraged

of

interference

will

to

radio or television reception,

measures:

energy.

the

limits

Part 15

not

to

If

not

for

of

FCC Rules,

occur

Know

installed and used properly,

it

may cause interference

a Class B

in

in

computing

which

a residential

.a

particular'

to

try

are designed

installation.

installation.

which

can be

to

correct the in-

device

to

• Reorient

• Relocate the

• Move

• Plug
branch

the

receiving antenna

the

computer

the

computer

circuits.

computer

with

away from the receiver

into a different

respect

to

outlet

the

so

Warning

This

equipment
pursuant
devices,
this

computer.

radio and TV reception.

Reproduction
tion,

of
been taken in the preparation
Corporation assumes no liability resulting
manual,

has been

to

Subpart J of

terminals,

Operation

certified

Part

printers, etc.)

with

to

comply

15

of

FCC Rules. Only peripherals

certified

non-certified peripherals is

300-Bps Intelligent Modem

© 1986 Tandy Corporation,

All Rights Reserved.

or

use, without express written permission from Tandy Corpora-

any portion

or

from

of

the use

this manual

of

of

the information contained herein.

with

to

comply

DCM-7

Fort

is

prohibited. While reasonable efforts have

this manual

receiver

that

computer

the

limits

with

and receiver are on

for

a Class B

the Class B

likely

limits

to

Operation Manual: .

Worth,

from

Texas 76102 U.S.A.

to

assure its accuracy, Tandy

any errors

different

computing

(computer

may be attached

result in interference

or

omissions in this

device,

input/ouput

to
to

2/86

Hayes ® is a registered trademark

XENIX®

is a registered trademark

10

9 8 7 6 5 4 3 2 1

of

Hayes Microcomputer Products, Inc.

of

Microsoft Corporation.

Contents

Introduction
1 · Description

Protocol (DIP) switches . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Communications protocol . . . . . .

...

...

..

....

of

the DCM-7

..

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

....

.. .. .. .. ..

• . . . . . . . • . • . . . . .

..

.........

....

.....

...

.. ..

.....

.....

..

... . .. .. ..

.....................•.......

2 Tandy protocol mode operation ...........................

Manual v. automatic operation
Originate v. answer mode
Sample programming sessions

Manual mode ·operations . . . . . . • . . . . . • . . . . . . . . . . . .

Automatic mode operations . . • . . . . . . . . • . . . . . . . . . . . . . . . .

Analog self-test mode

Always auto-answer mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . • .

On-line abort conditions . . • . • . • . . . . • . • . . . . . . . . . . . . . . . • . . . . . . . . . . • . . . . . . . . . . .

Result codes . . . • • . . • . . . . • • . • . . . . . . . . . . . • . . . . . . . . • . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . .

••....•...................•.•............•.•...........

...................•................•......

...............................•......•.....•.....

..................................•..•.......

...

. . . . . • . . . . . . . . . . . . • . . . . .

•.•

. . . . . . . . . . . . . . . . •

3 Hayes® protocol mode operation .........................

Command codes . . . . . . . . . . . • .

Registers . . . • . . . . . . . . . . . . . • . . . . . . . . . . . • . . . . . . . . . . • • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Result codes . . . . . • . • . . . . . . . . . . . . . • . . . . . . • . • . • . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . .

Logons in MS-DOS operating systems

.•

. . . . . . . . . . . . . .. . . . . . • . . . . . . . . . . . . . . . . • . . . . . . . . .

.......•..............•...........

Appendices

·1

. 3

8

11

11
11
11
14
15
17
18
18
19

21
21

24
26
26

A Tandy protocol reference .......................................

B Hayes protocol reference ........................................

Programming commands .

Registers . . . . . . . . . . . • . . . . • . • . . . . . . . . • . . • . . . . . . . . . • . . . . . . . . . . . . . • . • . . . . . . . . . . . . . . . .

Data

line monitoring

...

. . . . . . . • . . . . • . . . . . • . . . . . . . . . . . . . . . • . • . . . . . • . . . . .

.•....

~..................................................

C Connecting the DCM-7 ...........................................

Telephone connections . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • .

Computer connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power source . • . . . • . . • • • . . • . • . • • • . • . • • . . . . . . . . . . . . . • • . . . • . . . . . . . . . . • . . . . • • . . . . .

31

39
39

44

48

49

49
51
51

Contents

D XENIX® operations ................................................. 53

E Troubleshooting ......................................................... 55

Analog loop self-test

Multi-line phone operation

F Specifications ..................................

Performance . . . . .

Physical/ environmental

•••••.....•....•••..•.....•.•..•.......••....••.•.......• 55

• • . . . . . . . . . • . • • . . . . . . • . . . • . . . . • . . . . . . . . . . . • . • . . . . 56

~

........................... 57

• . • . • . . . . • . . . . . . . . . • . . . . . • . • . . . . . . . . . . • • . . . . . . . • • . . . . . . . . . • . . . 57

• . . • . . • . . • • . . . . . . . . . . . . . . . • . . . • . . . . . . . . • . • . . • . . . . • . . . 57

G Schematic diagram ................................................... 59

Index

··············································································~··

61

Tables

1

DIP

Switch Settings in Tandy Protocol Mode . . . . . . . . . . . . . . • . . . . . . . . . 6

DIP

2
3 Result Codes (Tandy)
4 Commands with Parameters (Hayes)
5 Basic Command Codes (Hayes)

6 Dialing and Answering Command Codes (Hayes)

7 Registers (Hayes) .•......•.•.•... ..••• .. ... ....•.. .••..

8 Result Codes (Hayes)-

9 Programining Commands (Tandy)

10 List Settings and Related Commands (Tandy) . . . . . . . . . . . . . . • . . . . . . . . . 36

11
12
13

Switch Settings in Hayes Protocol Mode

• . . . . . • . • . • . • . . . . . . • . . .

...........................•........

.•......•............•.•.......•..........

.........•.•.••••...........•.•..•........•........•....

...........•..•.....................•..

Dialer Codes (Hayes)

Modem-to-Computer Cables . . . . . . . . . . . . . . • . • . . . . . . . . . . . . . • . . • . • . • . . . . . . . . .

Computer Option Boards . • . . . • . • . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . • . . . . . • .

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

....•...•...........•..•

•.

• . . . . . .

...

. . . • . . . • . . • . . . . . . . . . . . 19

.......

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

..•.

.......•.

.•.

8

22
23
23
24
26
31

40
51
51

Introduction

With the Tandy direct-connect, 300-Bps Intelligent Modem DCM-7, your

or

computer or data terminal can communicate with other computers
nals using ordinary telephone lines.

The DCM-7 accepts data from a computer, converts the data into two­frequency tones and then sends the tones over telephone lines
modem. Conversely, the DCM-7 accepts tones from telephone lines and

data

changes those tones into
This direct-connect, Bell

automatic dial, answer
system configuration enhancements
provides operation in both Tandy and Hayes protocol modes - each selec-

at

table
In the Hayes protocol mode, your Modem

of
in Hayes protocol allow you
keyboard for the same operational modes used in Tandy protocol.

For example, you can set the DCM-7 for manual originate
mode,
incoming call when you are contacting a remote computer.
gram the DCM-7 for auto-originate or auto-answer mode and let the DCM-7
dial the telephone number
In either Tandy
perform operations such
specified number
communication

Another feature
you to monitor audibly the dialing and data communication progress. The
situation
codes.

Sample programming sessions are provided in each section
to help familiarize you with the various functions
you started using your Modem
familiar with
should keep you

the flip

running with Hayes software. Special command instructions and registers

in

is

of a DIP

which you manually dial the telephone number or answer an

is

of

reported visually

the manual and your Modem, the handy Quick Reference Card

and

or

Hayes protocol, the DCM-7 can be programmed to

of

rings and automatically redialing a phone number when

not established.

the DCM-7

"up-and-running!"

that your computer understands.

103-type modem

disconnect features, but also a wide range

switch.

to

program the DCM-7 from your computer

of

a remote computer or answer

as

automatically seizing the telephone line after a

is

a built-in monitor speaker which enables

on

your display with messages called results

as

quickly

is

not only designed with standard

as

well. Its microprocessing unit (MPU)

is

AT-compatible and capable

or

manual answer

Or

an

incoming call.

of

of

the DCM-7 and to get

as

possible. After you have become

termi-

to

another

of

you can pro-

this manual

,l

·

....

Description

of

the DCM-7 1

When power
panel will light - depending
DIP switch settings. These 6 indicators show the Modem's internal and
ternal operation status.

G)

POWER

@

POWER

when the Modem

®

OFF
to

@ TERMINAL READY indicator lights when the terminal

DTR

®

CARRIER
er

® TRANSMIT DATA indicator flashes when the Modem

data.

(j) RECEIVED DATA indicator flashes when the Modem

is

first applied, several

indicator lights when the power is ON.
switch turns the Modem

is

not being used.

HOOK indicator lights when the Modem

the

phone line).

(Data Terminal Ready) signal.

DETECT indicator lights when the Modem receives a carri-

tone

or

generates a "false" carrier. ·

CD

POWER I OFF HOOK I

®

on

the status

TERMINAL

READY

of

the indicators

of

ON

or

®

CARRIER

DETECT

on

the DCM-7's front

the computer's protocol and

OFF.

Be

sure.

to

turn

it OFF

is

ON

LINE (connected

is

supplying the

is

transmitting

is

receiving

dat~.

®

I TRANSMIT I RECEIVED

DATA DATA

TANDY'

300

BPS

INTELLIGENT MODEM DCM-7

ex-

Figure 1.

Front

3

Panel View

Description

CD

RS-232C standard DB-25
terface

@

PROTOCOL

@

PHONE

@

POWER

® WALL

of

the DCM-7

of

your computer.

(DIP) switches control the Modem's power-up condition.

jack

connects the telephone to the Modem.

jack

connects the Modem to the

JACK

phone line cord connects the Modem to the telephone line.

jack

connects the Modem to the RS-232C in-

AC

power adapter.

PHONE

CD

Figure 2

Before you connect the DCM-7, first read the instructions in Appendix
Connecting the DCM-7.
to

the computer! .

Be

Figure 3. A Typical Connection

..

Rear Panel View

sure to

turn

®

OFF

the power to the Modem

© ®

C,

and

4

Chapter 1

Protocol (DIP) switches

DIP switches control the DCM-7's power-up condition. These switches must
be set before you turn the power ON.

First, you will have to decide whether you want to use the Modem in the

Tandy protocol mode or Hayes protocol

munications software, you will want to
with Hayes communications software, set it to the Hayes protocol mode.
(Both

the

Tandy

with either communications software.)
Tandy protocol

When you select Tandy protocol mode, set
the Modem to set other
Figure 4 for the suggested switch settings in this mode (black portion shows
the switch position).

NO
NO

TRUE

1000

and 1200

DIP

and

switch functions as listed in Table

FUNCTION~

FUNCTION~

CARRIER!

DTR

TRUE

1 1

mode~

3000 personal computers can be used

m=;NO

~AUTO

If

you are using Tandy com-

set it for Tandy protocol.

DIP

Switch 7 to ON. This tells

1.

FUNCTION

ANSWER DISABLE

For

Refer to

I HAYES PROTOCOL

No

1

FUNCTION

1

use

l1~~~~~~11l~.

01

2 3 4 5 G 7 8

N -

FORCED DTR J I

FORCED CARRIER TANDY PROTOCOL

NO FUNCTION..
NO FUNCTION - . .

Figure 4.

DIP

1111

..

. . . ... AUTO ANSWER ENABLE

Switch Settings in Tandy Protocol Mode

5

1~

I L NO FUNCTION

..

NO

FUNCTION

Description

of

the DCM-7

Table 1.

SW

2

3

4

5

6

7 Should be ON Tandy. Sets the Modem to Tandy protocol mode.

8 Should be OFF No function.

Position

ON

OFF

ON

OFF

Should be OFF
Should be OFF
Should be OFF

ON

OFF Auto-answer disable. Modem assumes auto-originate

DIP

Switch Settings in Tandy Protocol Mode

Function

DTR

Forced

command from the local computer without a DTR
signal.

True DTR. Modem is OFF until it receives a true DTR

signal from the computer.

Forced carrier. Modem assumes forced carrier

detecf1> and disables the

Forced/True carrier. Modem selects between forced

carrier detect and true carrier
the G command input.

No function.
No function.
No function.

Auto-answer enable. Modem assumes auto-answer

upon power-up.

upon power-up.

(Data Terminal Ready). Modem accepts

G command.

detecf2> according to

*

1)

Forced carrier detect ... Modem issues a forced carrier signal to the local com-

as soon

puter

*2) True carrier detect ... Modem will be off until it receives true carrier from the

remote

DIP

Switch 2 interlocks with

i

ON

i

ON

as

computer.

power is turned ON.

DIP

Switch 6 as follows:

Modem assumes auto-answer with forced carrier
detect.

Modem assumes auto-originate with forced
rier detect.

car-

6

Chapter I

i

ON

~

2

i

ON

~

2

Hayes protocol
When you want to use your DCM-7 in Hayes protocol mode, position

7 to

OFF.

from those in Tandy protocol. Refer

tings

in

SEND

NUMERIC

VERBAL RESULT CODES

NO

~

6

~

€)

In this protocol mode, the remaining switches function differently

Hayes protocol mode.

RESULT CODES
RESUL_ T COD-

TRUE

FORCED

FORCED

RESULT CODES ---_

Modem assumes auto-answer with true carrier
detect at power-on. The true/forced carrier con­dition can be changed with the G command.

Modem assumes auto-originate wlth forced car­rier detect at power-on. The true/forced carrier
condition can be changed with the G command.

to

Figure 5 for suggested switch

~COMMAND

ES

-

CARRIER~

TRUE

DTR

11~~-

~1

ornJ

CARRIER~

11

1 1

w~~w~~

2 3 4 5

I

11 · 111

- - . _ - AUTO ANSWER DISABLE

- - - COMMAND ECHO OFF

JG-

jHAYES

1

€)

7 8

--

AUTO.ANSWER ENABLE

rNo

FUNCTION

1~

LNo

FUNCTION

TANDY PROTOCOL

ECHO

PROTOCOL

Switch

set-.

ON

Figure 5.

DIP

Switch Settings in Hayes Protocol Mode

7

Description

of

the DCM-7

Table 2.

SW

2

3

4

5

6

7 Should

8 Should

For

Set Switch 4

•Position

ON

OFF True

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

.easy operation, position Switch 5 to OFF

to

DIP

be

OFF

be

OFF

OFF

and Switch 3 to

Switch Settings

Forced

Forced carrier detect.
True carrier detect.

Displays verbal result codes.
Displays

Result codes disabled. Disables Switch

Result codes enabled. Enables Switch 3.
Command echo disable.

Command echo enable.
Auto-answer disable.

Auto-answer· enable.
Sets the Modem
No

OTA.

OTA.

Function.

in

Hayes Protocol Mode

Function

numeric result codes.

to Hayes protocol mode.

to

echo the command line.

ON

to

send the verbal result codes

3.

to

the screen.-

Communications protocol

The following criteria must be met before computer'-to-computer communi­cation can ·occur.

1.

Both

computers must have the same communications protocol:

300 bits/second (Bps)

Word length

Parity (even, odd
Number

See your computer owner's manual for instructions

munications protocol.

One modem must be in ORIGinate mode and the other must be in

2.
Swer mode. Usually, when you call another computer, you should be
in ORIGinate mode. When you receive a call, you should be in ANSwer
mode.

of

stop bits

(7

bits

or

or

8 bits)
none)
(1

or

2 bits)

on

setting the com-

AN'"

8.

Chapter 1

The DCM-7 provides automatic and manual operations in both originate and

oi

answer modes. When opened for programming by the wake-up
code sequence, it will automatically synchronize the speed rate, word length,

and

parity
system.

Helpful Tip:

Whe,n

. garbled data, use the self-test mode to help you find the cause

Refer
or in Appendix B, Hayes protocol reference.

If

you plan to use the PCM-7 in Tandy protocol mode only, you may skip
Chapter 3 and Appendix
tocol mode only, you may disregard Chapter 2, and Appendices A and D.
Refer also to the operation mariual which accompanies your
tions software package.

stop-bit numbers (communications protocol)

you use your

to

the section

DCM-:-

7 for the first time

on

self-test in Appendix A, Tandy protocol reference

B.

However,

or

if

you intend to use it in Hayes· pro-

when you seem to be getting

of

attention

your computer·

of

the problem.

communica"'."

9

·

....

Tandy protocol mode operation 2

This chapter will give you an idea
protocol mode. A Videotex Plus communications package for Tandy's Model

16

II, 12,
With this software package you can communicate with a variety
tion services and host computer systems. The examples will help familiarize
you with some

If

you are using an MS-DOS operating system, move directly to the auto

logon session using DeskMate's Telecom in Chapter 3, Hayes protocol mode
operation. XENIX users may want to skip to Appendix D.
For a detailed discussion
refer to Appendix

and 6000 microcomputers

of

the operations the Modem

of

A.

of

what the DCM-7 can do in the Tandy

is

used in the sample sessions following.

of

informa-

is

capable

all the available commands in Tandy protocol,

of

performing.

Manual v. automatic operation

When you want to dial an information service (such as CompuServe or Dow
Jones)
VIDTEX, set the Modem to manual operation mode.
control what the system does by manually dialing and answering the phone.

When you want the DCM-7
for you, set it to automatic operation mode.
the phone number you store in its memory
one calls you. Automatic mode, for instance, lets you dial the information
service number without picking up the phone - just type the number along
with the proper DCM-7 programming commands on the computer keyboard.

or

communicate with another person whose computer

In

- -

to

dial a phone number

In

this mode, the Modem dials

or

answers the phone when some-

or

is

also using

this mode, you can

answer the phone

Originate v. answer mode

To place a call to
set

the DCM-7 to originate mode. In this mode, the call originates from your
computer. When you want to receive a call (answer the phone), set the DCM-7
to answer mode. Note that originate and answer modes can be used either
manually or automatically.

an

information service

or

another person using VIDTEX,

Sample programming sessions

All Modem functions are controlled by ASCII encoded commands that you

from

send
the DCM-7 for programming.

1. Check again that all peripherals are correctly connected and receiving

your computer keyboard. Use the wake-up

power.

11

command*

to open

Tandy protocol mode operation

2. Set the

3.

Flip the Modem's power switch
Load.and run the Videotex Plus communications program. Refer to your

4.

DIP

switches as follows:

on

the front panel to the

ON

position.

Videotex user's guide as well.

5.

At

TRSDOS Ready, type VIDTEX

(ENTER)

•

TERMINAL

READY

dicator lights.

6. Set the communications protocol.

300 Bps.

7~

Open

the

Modem for .programming by pressing * for the wake-up

Be

sure the operation speed

command.
The Modem.

you

to

it what operations are

8. When the
to display
is

turned on, . the list shows:

MODE
TYPE
FCD
SPKR
ANSW
DTRY
TEST
NUMB
RATE
EXIT

Note: The default parameter

sition

is

now in the command receptive state and

is

waiting for

begin programming or setting the internal switches that will tell

to

be performed.

* echoes

or

=A

=0

= y

=Y

2
1

N

= s

=

OF

of

on

your computer screen, enter LIST command L

list the Modem's current parameters. When the Modem

Automatic
Originate
Forced Carrier Detect
Monitor speaker
2 rings before Auto Answer

automatic dial try

1
Test

modeOFF
Telephone number stored in memory
Slow Dialing rate
Exit communication upon receiving < CTRL >

< 0 > (ASCII

DIP

switches 2 and 6.

OF)

ON

of

ON

line F

CD=

varies with the

After the parameters are listed, the Modem returns to the command
tive state where

it

waits for further instructions. "

is.

set to

po'-

recep..;.

in-

12

Chapter 2

CompuServe logon
CompuServe Information Service

is

widely known for its numerous on-line
services for both business and home computer owners. Dedicated telephone
numbers in major cities provide you access to CompuServe.

Use your infor-

mation service user's guide to find out how to contact and use the service.
Since the DCM-7

your command - all you have to do to begin the logon

is

already in the command receptive state - waiting for

is

prepare the Modem

to dial the information service access number.

1.

Press

@to

place the Modem in the dialer programming mode.

example,

if

you enter [phone] as your local access number for

touch-tone dialing, the sequence appears as:

DT(111)555-1234

If

you're using a rotary (pulse) type telephone, type R instead

2. When the phone number

prQtocol reference),

lin~s

and to begin dialing the number. OFF

The

screen shows:

DIALING ... T(111)555-1234
CONNECT

Dialing

...

- -

and connect are the Result codes (discussed later in this sec-

tion) which keep you informed

If

you received a? instead

is

properly formatted (see D command, Tandy

press®

to force the Modem to seize

HOOK

of

the status

of

the message shown, you probably entered

or

progress

the

indicator lights.

of

of

telephone

a phone call.

a key that the Modem did not recognize.

3.

Press ( CTRL) © and type the User ID number that you received with

the

software package when the screen prompts:

User ID:

4.

Next, type the password that you received with the software package
when.

the display prompts: -

Password:

Your password

At this point, your logon to CompuServe
using the

s~rvice.

ply substitute the appropriate dialog as provided in the information

is

not printed

on

the screen to retain its secrecy.

is

complete and you may begin

To use other information services and host systems, sim-

s~rvice

_ user's guide.

For

T.

13

Tandy protocol mode operation

Manual mode operations

When operating in manual mode, you control the system by manually dial-

is

ing and answering the telephone. Manual mode (answer or originate)
when you want to talk by telephone to a friend at a remote location, and
later exchange computer data without redialing.

Example 1. Manual answer mode
The phone rings

a while to your friend, you decide to exchange information by computer
(telecommunications) without breaking voice call:

1. Your friend selects to be the originating station, while you are the an­swering station.

M

A Select answer mode.

2. Give your friend time to set up the originating modem.
Press

3.

4. The answer station always issues the X command first. After hearing

5. Hang up

Be

sure to keep 'quiet when the handset

cause errors in the
Be

careful when you hang up the telephone since slamming

phone back

disrupt carrier long enough to start a
To return to voice communications after transmitting data:

1. Carefully pick up the handset (both modem stations).

2. Type

®.

you hear through the built-in speaker
while the Modem

the answer modem's carrier tone, the originate station sends the X com-

mand to complete the connection. The Modem goes on line, and you'll

see the

at

you might signal your friend by typing:

THAT'S ALL! I

and

you answer by picking up the receiver. After talking

Set up your Modem by entering:

Wake up!
Select manual mode.

The Modem transmits carrier tone. The carrier

or

when you pick up the receiver

is

in communication with another modem.

CONNECT result code

both

handsets.

data

being passed by the modems.

on

the hook while the modems are controlling the lines could

the keyboard that you will be aborting carrier. For example,

AM

ABORTING CARRIER.

on

the screen.

is

OFF HOOK. Noise picked up could

or

loss;..of-carrier disconnect sequence.

useful

is

the sound

dropping the

14

Chapter 2

3. After making sure your handsetis OFF HOOK, enter the abort charac­ter (

e"'fRL) @ to force the Modem

not

have the CTRL key, refer to your computer manual to find out the
of

hex value

key
redefinition

After 3 seconds
result code,
Modem

and

is

in OFF-LINE mode. Press ~ to return

OF,

or change the

@.

Refer to Appendix A, @ command. ·

of

inactivity, your Modem logs out with the DISCONNECT

your friend's modem (if automatic) shuts down, too. The

OFF

LINE.

abort

character using abort character

If

your computer does

to

the command recep-

tive mode.
Example

l.

2:

Manual originate mode

Set the Modem for manual originate mode.

@ for originate. Then, press (!) to check the current parameter settings.

Press~

for manual and

The first two parameters should show:

MODE=

TYPE = 0

M

2. Now pick up the telephone and dial the information service phone num­ber. When the information service answers the phone, you will hear a
high-pitched tone.

3.

Press

®.The
tects the carrier tone, it issues low-pitched tone. Then it goes
and

sends the CONNECT result code to the screen. ·

4.

Gently

hang~

OFF-HOOK indicator lights. As soon as the Modem de-

ON LINE

the phone. You can then begin following the instruc-

tions detailed in your Videotex and information service user's guides.

Automatic mode operations

The DCM-7 can be programmed to make a call
automatically.

In

automatic mode operation, you can call
service without picking up the phone - just type in the phone number
your computer keyboard. You can also tell the Modem to auto-answer your

telephone.

Example 3: Automatic answer mode

1.

To

set the Modem for automatic mode, first type * to enter command
mode, then type
shows

MODE=

firm that the mode

L to display the current parameter· settings.

M, then press ~ for automatic mode. Type L to con-

is

now A for automatic.

or

answer your telephone

an

information

If

on

screen

15

Tandy protocol mode operation

2. Type A to set the Modem

does not show

3. Press ®

the

value

to

force the Modem out
auto-answer mode. The Modem will then wait for the telephone
and

sends:

WAITING

FOR

RING

to

the answer mode

A.

of

command receptive state

if

the

TYPE

parameter·

and

into

to

ring

4. When the phone rings, the Modem begins counting the rings and sends
the RING result code to the display for each ring. After 2 rings, it answers
by seizing the telephone line and asserts carrier. The calling modem replies
with its carrier. Both modems are now

ON

LINE

and

telecommunica-

tions can begin.

is

set

to 2 at

The ring number

power-on. This means your Modem will seize

the phone line after 2 rings. When you want to change this number, press

OJ

for the ring change command when the Modem is in command recep-

tive mode. The display prompts:

ANSWER

When you do
by pressing (ENTER) , which is the CR (Carriage Return) key.
the ring number, type
the ENTER key is accepted.
"echo" the typed key (if displayable)

If

the key you press is a valid entry, the Modem sends the next prompt:

RETRY

For

the time being, press (ENTER)

If

either modem breaks
the abort character,
then the
answer mode
mode,
You can
detects the

ON

1-9

not

FOR

1-9

WAITING

and

it

will continue

turn

OFF

*, it will change

RINGS OR

need

to

in

TIMES OR CR

the

the

FOR

monitors

to

CR

FOR

NO

CHANGE =

change the number

the new number. Note

If

you press any other key, the DCM-7 will

and

FOR

to

connection after a successful

of

rings, answer this

that

only a number key

ask the question again.

NO CHANGE =

skip.

data

prompt

To

change

exchange with

DCM-7 will send the DISCONNECT result code,

RING

result code. This means it returns to auto-

the

line. As long as the Modem

monitor the telephone line for

is

in auto-answer

an

incoming call.

this call-waiting mode by pressing eJ. When the Modem

to

auto-originate mode and return

to

the command

or

receptive state.

Example 4: Automatic originate mode

in

Step 1

of

1. Follow the procedure

2. Type

0 to set the Modem

not show the value

to

0.

Example 3, Automatic answer mode.

originate mode

16

if

the

TYPE

parameter does