Multi-Tech Systems MMV1600 owner manual ATH1, ATH0, Ato, ATQ1, ATQ0

Hanging Up,

You

can

make

the

command

modem

hang

up

(go

On

Hook),

or

and

go

Off

Hook,

with

the

H

command.

Entering

ATH1

(upper

case)

Bringing the

will bring the line Off Hook just as if you had picked up the

Phone Line

telephone handset. The command modem remains in command

Off Hook

mode.

H0-1

You

can

hang

up

by

entering

ATH0

or

ATH

(remember

that

the

default value is 0 when nothing is entered). It is not necessary to

use the H1command to

bring the line Off Hook when using the

command modem D command to dial,since the modem will

g o

off hook automatically when you hit

Return at the end of

the Dial command.

Inquiry for

Some

systems

or

software

packages

may

automatically

check

Product

the

“identification”

of

the

modem

with

which

they

are

communicat-

Code

ing,

by

using

the I command. This “read” command

enables

the

software

to

determine

the

type

of

modem

with

which

it

is

commu-

I

nicating.

When ATI or ATI0 (upper case) is entered, the command modem

will respond with xxx,

with the first two digits indicating model, and

the third digit indicating the revision level.

Exiting

You

can

bring

the

command

modem

out

of

command

mode

back

Command

into

the

On-Line

Mode,

by

entering

ATO

(where

O

is

the

letter

O,

Mode,

not

the

number

0).

In

this

case,

the

O

command

reverses

what

Going Back

was

done

by

entering

the

Escape code

(see

Escape

Code

+++

On-LIne

explanation).

O

Pulse or

The

command

modem

will

dial

numbers

using

either

pulse

or

Tone

tone

dialing,

or

in

a

combination

of

both

methods.

Pulse

dialing

Dialing

is the method used by rotary-dial telephones, which involve the

timed

opening

and

closing

of

a

line

relay.

Tone

dialing

is

that

used

P

by push button Touch-Tone telephones, and is sometimes

referred to as DTMF, or

Dual-Tone Multi-Frequency dialing.

T

This

is

controlled

by including

a

P

for

Pulse

or

a

T

for

Tone

in

the

dialing

command,

right

before

the

digits

you

wish

to

have

dialed

in that manner.

For

example,

you

would

pulse-dial

the

number

555-1212

by

entering

ATDP5551212

and

hitting

Return.

You

could

tone-dial

the same number by entering ATDT5551212 and hitting Return.

If neither Pulse or Tone dialing is specified in the dialing com

mand,

the

command

modem will use whatever method was last

used. If the modem was reset or just powered up, it will use Pulse

dialing, even if you do not use the letter P in your dial command.

Nearly

all

telephone

systems

in

the

U.S.

are

now

compatible

with

tone

dialing.

Since

that

is

the

faster

method,

you

will

probably

choose the tone method for your dialing.

An

example

of

combining

pulse

and

tone

dialing

could

involve

a

PBX

system

where

9

had

to

be pulse-dialed first,

then

the

rest

of

the number tone-dialed after

pausing

for

a

second

dial

tone.

The

number would be dialed by entering ATDP9,T5551212 and

hitting

Return. (The

comma causes a pause, which we’ll explain

soon.)

Result Codes

It

may

be

desirable

to disable the Result Codes

(see

V

command)

Enabled or

altogether

in

certain

applications,

such

as

computer-controlled

Disabled

auto

dialing.

The

Q

command

is

used

to

do

this,

with

ATQ1

disabling

the

Result

Code

transmissions

and

ATQ0

(or

ATQ)

Q0-1

enabling

them.

If

you

do

not

select

either

method,

the

factory

default setting will enable the Result Codes to be sent.

Forcing an

To

dial

up another

modem

that

is

in

Originate

mode,

your

Answer

modem

must

be in

Answer

mode

to

initiate

the

"handshaking"

Tone,

and

establishment

of

a

connection.

This

is

done

automatically