Page 1
Page 2
Maestro
Executive Series
Modem
Thank
yo
u
fo
r
choosi
ng
this Australia
n
designe
d
and[
manufactured modem. Your MAESTRO Executive Series
i
modem has been
developed
fo
r
simplicit
y
of use and contains
I
state-of-the-ar
t
Di
ita
l
Signa
l
Processing circuitry.
I
WARNING
UNDER NO CIRCUMSTANCES SHOULD YOU ALLOW
YOUR MODEM TO REMAIN CONNECTED TO THE
T
ELEPHONE LINE WHEN NOT IN USE
.
DAMAGE CAUSED TO THE MODEM BY LIGHTNING
STRIKES OR OVERVOLTAGE SURGE WILL NOT B
E
COVERED UNDER THE TERMS AND CONDITIONS OF
YOUR WARRANTY.
©
1993 MAESTRO PTY LTD. Ali
Rights
Reserved.
P.O. BOX
136, MITCHELL,
A.C.T. 291
1
Tel: (06} 242 9755 Fax: (06) 24
2 9
756
Page 3
3
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e
intentionall
y
left blank
:_-_·.·_.·._·
.
.
i_.·._._t
:
1········
·
1>·
Trademark
s
Disclaime
r
Hayes
t"
Smartmodem™ is a
registere
d
trademark o
f
Hayes
Microcomputer Products Inc.
Crosstalk is a
registere
d
trademark of Microstuf Inc
.
IBM i
s
a
registere
d
trademark of International Business Machines Corporation
.
VT5
2,
VTIOO and VT220 are trademarks o
f
Digital
Equipmen
t
Corporation.
A
ll other
produc
t
names are
copyright
and
registere
d
trademarks/tradenames of their
respective
owners.
2
Copyrigh
t
© MAESTRO PTY
LTD
,
1985-1993.
Revision 1.
1
A
ll
rights
reserved
.
Printed in Australia
.
N
o
p
art
of thi
s
publicati
on
may be
reproduce
d,
transmitte
d, transcribed, stored in a retreival
system,
or translated into
a
ny language
o
r
computer language
,
i
n
an
y
form
b
y
any
means
,
electronic, mechanical
,
magnetic
, optical
,
chemical, manual or otherwise, without th
e
expre
ss
written consent of MAESTRO PTY LID.
MAESTRO PTY L
ID makes no
representation
s
or w
arranties wit
h
repec
t
to the contents
hereof an
d
specifically
disclaims
any
warranties of merchantabilit
y or fitness for any
p
articular
purpose.
Further,
MAESTRO PTY LTD reserves the right to revise this publication, and to
mak
e
change
s
from time to time in th
e content hereof without obligation of MAESTRO PT
Y
LfD
t
o
notify any person
of such revisions or
changes.
Page 4
Thi
s
page
intentionally left blank
Table Of Contents
1.
INTRODUCTION
1.1
Summary
. . . . . .
.
1.2 Featur
es
. .
.
1.3
Front Panel L
ED Indicators.
2. FUNCTIONAL DES
CRIPTION
2.1 Automati
c
Speed
And Format
Sensing
2.2
Establishing
Modern Connections.
2.2. l Connection
Speed
s
.
2.2.2 Automode Detect
2.2.3 Mode
rn
Handshaking
Protocol
2.2
.4 Phone Numbe
r
Directo
ry
. .
2.3 Data Mode .
. . . .
_
.
. .
2. 3
. l Constan
t
Speed
Interface
(Normal
Mode
)
2.3.2 Flow Control . . . . .
2.3.3
Escap
e
S
equence
Detection
2.3
.4 Br
eak Detecti
on . .
. .
2.3.5 Direct Mode . . . . .
2.3.
6
Telephon
e
Line
Monitoring
2.3.7 Retrain .
. . . .
2.3.8 Synchronous Data Mode
2
.4 V.42 / V.42
bis
. . .
2.4. l S
Registers
.
.
. . .
2.4.2 AT Commands . .
.
2.5 Microcorn
Networking
Protocol
(
MNP
)
2.5.
l
Compatibilit
y
. . .
.
2.5.2
MNP
3-Way
Handshak
e
2.5.3
MNP Data Mode
.
2.6
Diagnostics
. . . .
. . .
2.6
.
l
Analogu
e
L
oopback
.
.
2.6.2
Analogue L
oop
Self Test
2.6.3 Remote
Digital
Loopback (RDL)
2.6
.4 Remote
Digit
al
L
oopbac
k
with Self Te
st
.
2.6.5
Digital
Loopback
.
. . . ·
. . .
2.6.6 Asynchronous
Diagnosti
c
Commands .
3
.
ATCOMM
AND
S
3
. l Command Guidelines . . . . . . .
Table 3-
1. AT Command
Summ
ary
.
Table 3-2. AT Command Definitions.
Table 3-3. AT& Command Definitions
Table 3-4. AT\ Command Definitions.
Table 3-
5. AT%, Command Definition
s
4. S REGISTER
S
4.1
Facto
ry
Defaults
. . . · .
. .
4.2
S
Registe
r
Determination
Table 4-1. S
Register
Summary
.
Table 4-2.
S
Registe
r
Definition
s
Executive Series
Sampl
e
Connect
Strings.
.
Executive Series Notes . . . . . . . . .
5
6
6
6
7
8
8
9
9
9
9
:
9
1
0
10
10
1
1
11
1
2
1
2
1
2
13
1
3
1
4
1
6
1
7
17
1
8
1
8
2
0
20
20
2
1
2
1
22
22
23
2
3
24
26
3
4
4
0
43
4
5
4
5
4
5
4
6
4
7
5
6
5
7
Page 5
1.
INTRODUCTION }
1.
1
Summary
The Maestro Executive Series modems
operat
e
ove
r
dial-
up
or leas
ed
lines at ·.
communicati
on
speeds u
p
to 1
4400
bps,
a
nd wit
h dat
a
compression
enabl
ed ca
n
deliver;
effective
throughputs
o
f
u
p
to 5
7600
bps
.
The Executive Serie
s
is
fully
compatibl
e
with
CCI
TI V.3
2
bis,
V.32,
V.2
2
bis,
V.22 and V.21 recommendations, and Bell 212A and
103
•
modes
.
The Executive Serie
s
supports
V
.42 error-correction and V.42
bis
dat
a
compression
.
protocols
.
The modem als
o
supports
MNP class
es 2, 3 a
nd 4 error correction and
MNP class
·
S data
compression
.
It c
an als
o
operate
i
n non-error-correcting modes
.
A
Hayes-compatible
industry
standard "AT" command set i
s
implemented
,
whic
h
ensure
s
operation
with all
popular
communication
s softwar
e
packages
.
"AT
"
command:
extensions
simplif
y
the use of V
.42, V.42 b
is and
MNP capabilities. The Executive Series
.
mode
ms
provide·
auto-dial,
auto-redial
and auto-answer functions, and can
operate
in
bo
th .. ..
synchronou
s
and
asynchronou
s
modes
.
1.2 Features
CCITT
V.3
2,
V.2
2
bis
,
V.22 a
nd V.21
operating
modes with auto-mode detection ·
·
CCITT V.
32 bis 14
400
bps
(144
M
and 144FM
)
.
V .17 14400
bps
Grou
p
ill
send/receive f
ax
capab
ilitie
s
( l 44FM)
Bell 212A and
103
operatin
g
mode
s
V .42
compliant
error correctio
n
(LAP-M
and
MNP
)
V.42 b
is and
MNP 5 data
compression
Automatic V.42
/MNP
4, V.42
bis
/MNP
S negotiatio
n
Asynchronous/synchronous
mode
s
Enhanced
Hay
es
"AT"comroa
nd se
t
Extended
MNP comman
ds
Spe
ed
buffe
ring/flow
control/constant speed interface
Direct mod
e
option
(passthrou
gh
data path)
Line
quali
ty
monitor and re
train capability
Prograrnmable
s
peaker
volume control
Diagnostics
:
- Remote
digita
l loop
and remot
e
digita
l
l
oop self test
-
Analogu
e
loop
and
analogu
e
loop self test
-
Digit
al
loop
tes
t
- Power-on self test
144-dig
it telephon
e
numbe
r
directory,
allowing
four telephone numbers (each a
maximum
length
of 3
6
digits
)
to be stor
ed
in NVRA
M
Intern
al car
d
(IBM)
and extern
al model
options
available
6
1.3 Front Panel LED Indicators
AA
Auto-Answer: On when SO > 0 else flashes in unison with th
e
inco
min
g
RIN
G
signal
from th
e
telephon
e
line
.
H
S
Hi
gh Speed:
This
light is on when in Command Mode and the Dat
a
Terminal
Equipment (DTE) speed is 480
0
bp
s
o
r
higher.
When
in Data Mode
(online),
i
t
indicates that th
e c
arrier
being
r
eceiv
ed from the dista
nt modem is
4800
bps
o
r
zreater
,
OH
Off-Hook: Indicates that the modem is c
onnected to the telephone line.
DTR
Data Terminal Ready: When lit, indicates theDTR line is
in th
e active state.
RTS
Request To Send: Us
ed
in
flow control. Whe
n
lit,
indicates the D
TE is
ready
t
o
receive data from the modem
.
TxD Transmit Data: Lights when data is bei
ng sent from the DTE
.
Rx
D
Receive Data: Lights when data is bei
ng sent from the modem to the DTE.
DCD Data Carrier Detect
:
Lights when a valid c
arrier
sign
al
i
s
being
received from
the distant modem
.
CTS Clear To Send
:
Indicates the modem is
ready
to r
eceive data from the DTE.
Used
in
flow control modes
.
DSR
Data Set Ready: Indicates to the DTE that the mode
m
(th
e
dat
a
set
)
i
s
ready
fo
r
ooeration
.
RI
Rin
g
Indicator
:
Indicates that the modem i
s
recei
vin
g
a RIN
G
sign
al
from th
e
telephone line side
.
TM Test Mode
:
Indicates that the
modem is
perfo
rmin
g
an intern
al self test
,
usu
all
y
as a result of
power being
applie
d
or after
an ATZ command
being
received
.
If
flashing, indicates that there was
an error detected
d
uring
the self test.
E
l
Exoansi
on One: Not operational.
E2 Expansion Two: Not operational
.
E
3
Exoansion Three: Not operational.
PWR
Power: Indicates that Power is bei
ng
applied
to the modem
.
Page 6
2. FUNCTIONAL DESCRIPTION
2.1 Automati
c
Speed
And Format
Sensing
The Executive Series modem can automatically determine th
e
speed
a
nd forma
t
of the
data being sent from the DTE. This is done by a "wake-up"
string
of known character
s
sen
t
from the DTE to the modem befor
e eve
ry comma
nd
line. The
wake-up
sequenc
e
is "AT
"
in
upper
or lower case followed by any legal command, an
d
ending
in
a
c
arriage
return. Both
the
'A' and the
'
T'
character must
be entered in the same case,
upper
o
r
lower
.
It
is not
necessary
that commands be entered after the "AT
"
sequence
,
b
ut
a
c
arriag
e
return must
alway
s
be entered at the end of a line.
Th
e
spee
d
is determined
b
y
the letter 'A' or 'a', whilst the format is finalised
u
pon
inpu
t
of the lette
r
'
T'
o
r
't'
,
which i
s
performed
a
t
eve
ry
command line. The mode
m
sense
s
75, 150, 300,
600, 12
00, 2400, 4800, 9600, 19200, 38400 and 57600
bps
and th
e
followin
g
data formats
:
Parity
Dat
a
Lengt
h
No.Of
Char.
Length
(No
.
o
f
bits)
Sto Bits (No. ofBits)
Non
e
7
2
10
O
dd
7
10
Eve
n
7
10
Non
e
8
10
O
dd
8
11
'"
Eve
n
8
11
>I<
*
l l-bit characters are sensed, but the
pari
ty
bits ar
e
s
trippe
d
o
ff during
data transmissio
n
in
Nonn
a! and Error Correction modes. Direct mode
does not
s
tri
p
o
ff the
p
arity
bits
.
·
The modem
spee
d
senses data with mark or
space parity
.
However, the unit self
-
configure
s
to d
ifferen
t
p
ari
ty
setting
s
as follows
:
D
TE Conflzurati
on
Modem Confizuratio
n
7 mar
k
7 none
7 spac
e
8 non
e
8
mar
k
8 non
e
8 spac
e
Seven
8
2.2
Establishi
ng
Modem Connection
s
2.2.1 Connectio
n
Speed
s
The possible modem-to-modem connectio
n
modes/speeds
are V.3
2
bis
1440
0
bps,
V.3
2 9600 bps, V.32 4800 bps, V.22
bis
240
0
bps
,
V.22 1200
bps
,
Bell 212A 1200
bps,
V.2
1
3
00
bp
s
and Bell 103 3
00
bps
.
The ATNx command and the value hel
d
in
the S37
register
determine whethe
r
the
Executive Series will allow only
p
articular
connections, o
r
automaticall
y
detect
a
remot
e
modem's desired connection. See the detailed section
on "AT'' commands for
f
urther
information
.
2.2.2 Automode Detect
Automode detecti
on is enable
d
b
y
the ATNl co
mmand, and allows the Executiv
e
Series to connect with another modern that i
s
configured
fo
r
differi
ng
c
onnecti
on modes
.
The originating Executive Series modem waits for th
e
answeri
ng
modem to
generat
e
an
answer tone
.
Dependin
g
on the
type
and
length
of tones
generated by
th
e
remote,
answerin
g
modem, the Executive Series
will
automatically
determine whether t
o
attemp
t
a V.32
bis
14400 connection, or to fall bac
k
imm
ediatel
y
to V.32 9600. From V
.32
9
600,
the
modem
attempts
a V.22
bis
2
400 connection.
If
a valid V.2
2
bis
or V.22 1200 carrier is no
t
detected,
the Executive Series then
automaticall
y
falls back to V.21 mode
.
If
c
arrier is s
till no
t
detected
,
the modem
hang
s
up.
An answe
ring Executive Series modem
generates
a V.32
b
is
answer tone an
d
attempt
s
a 14
400 bps connection.
If
a 14400 connection is not achieved, the modem
will train down
through 12000, 9
600, 7200, 4800, 2400 and 120
0
bps.
If
a valid carrier is not
detected,
th
e
modem
will the
n
attempt
a V.21 3
00 connecti
on as a last resort afte
r
which,
if
c
arrier is s
till
not detected within the remainder of S7 seconds,
it
·
hangs up
.
2.2.3 Mode
m
Handshakin
g
Protoco
l
An abo
rt call timer is initiated when the las
t
digi
t
is diall
ed and is reset when th
e
Executive Series detects either answer tone o
r
busy.
If
neither tone is detected
durin
g
the tim
e
specified
in
the S7
register
(defau
lt is 5
0
seconds)
,
the cal
l
attemp
t
is aborted.
If
th
e abort
time
r
exp
ire
s
before the number of
rings spec
ified
in
the Sl
register (defau
lt
i
s
O
rings)
h
as
occurred, the call is also aborted
.
2.2.4 Phone Number
Directory
The Executive Series modems cont
ain fou
r
telephon
e
number en
tries
in
a
directo
ry
tha
t
i
s saved
in
the Non-Volatile RAM
(NVRAM).
Eac
h
entry
has one field for the dial
s
tri
ng
which can be
u
p
to 36 characters in
length.
The four entries are accesse
d
usi
ng
the AT &Zn=
x
and A TDS=n commands.
9
Page 7
2.3 Data Mode
Dat
a
mode exists
when a
telephone-line
connection has been established between tw
o
compatible
modems.
2.3
.1 Constan
t
Spee
d
Interface (Normal Mode)
Constan
t
spee
d
mode allows the Data Te
rmin
al Equipment (DTE) to send and receive
data from
the
modem at a
speed
that differs from that of the speed of the physical, or modem
-
to-modem c
onnection
.
Constant
spee
d
i
s
implemented
b
y
using
buffers t
o hol
d data within the modem until th
e
D
TE or
th
e
distant modem
is able t
o
accep
t
data. The data is store
d
in
two buffers; th
e
terminal
buff
er which
holds data received from the DTE, and the modem buffer which hold
s
data from
the dis
tant modem for transmission to the DTE
.
Constant
spe
ed
in the Executive Series allows telco speeds of 14400, 120
00, 9600
,
4800,
240
0,
1200 o
r
300
bps
with DTE
speeds
from 30
0 bps through t
o 57600 bps
.
2.3.2 Flow Contro
l
Flow contro
l
is the
process
b
y
which the DTE a
nd modem interact with each oth
er
suc
h
that the
respective
buffers d
o not ove
rflow. There are two data paths which
r
e�uire
fl�w
control
and
eac
h
pat
h
has flow contro
l
options
that can
be selected. The Execurive Senes
support
s
bot
h
hardwar
e
(RTS/CTS)
and software
(
XO N/XOFF)
flow control.
DTE
To Modem Flow Contro
l
To
e
firs
t
pat
h
is betwee
n
the DTE and the modem.
If
the speed of the connection
differ
s
from that
of the
DTE,
then flow control must
be used to ensure data integrity.
1
.
XON/XOFF
Flo
w
Control. When
receivin
g
data from th
e
D�.
th
e
Executive
_
S
e�e
s
send
s
the
XOFF
character
(13H
)
to the DTE when the terminal buffer
i
s
n
early full. Thi
s
point
is known
as the
"high
water m�rk". When the te
rminal buffer empties to a point c
alled th
e
"low water mark"
,
the
modem sends th
e
X
ON
character
(1 lH
)
to the DTE to allow the buffe
r
t
o
fill.
When
transmitting
data to the
DTE
,
the modem reacts t
o
fl?w control_
c�aracters
from
the D
TE
by stoppin
g
transmissi
on
if a
n
XOFF
is r
eceived, or restarn
ng transmission
if
a
n
XON
is received.
XON/XOFF
flow
contro
l
is enabled with the AT&K4 command, or for transpare
nt
flow control with the AT &KS command
.
Note:
X
ON
and
XO
FF
characters are transmitted and detected according to the
format
tha
t
was sensed
during
speed
and format detection.
1
0
2. RTS/CTS Flow Contro
l. The Executive Series modem controls the CT
S
output.
When
CTS i
s
OFF,
the DTE is
prevented
from
sen
din
g
data to the modem. When CTS i
s
ON
,
th
e
D
TE can send data. When RTS
i
s
OFF,
the Executive Series will not send data to the
DTE.
When RTS is
ON,
the modem is pe
rmitted to send data to the DTE. RTS/CTS flow control
is
enabl
ed
b
y
the AT
&
K
3
(facto
ry default)
command
.
Modem To Modem Flow Contro
l
The second dat
a
pat
h
is between local and remote modems over the
telephon
e
line.
When
receivin
g
data from the remote modem, the Executive Series modem sends the
XO
FF
character to the remote modem when its buffer reaches th
e
hi
gh
water mark. When the
modem buffer
emptie
s
to the low water mark, the Executive Series sends the
XO N
character
allowin
g
the buffer to commenc
e
fil
lin
g
onc
e
again.
When
transmittin
g
data to the remote modem; the Executive Series reacts to these flow
control characters from the remote mode
m
by stoppin
g
transmissio
n
if
an XOFF
i
s
r
eceived,
o
r
·
by continuing
transmission
up
on receip
t
of an
X O
N
character
.
XON/XOFF
flow control cannot
be used between modem
s
d
urin
g
MNP sessions.
In
this case, flow control i
s
accomplished
by
credit allocation intern
al to
MNP
.
Buffer
s
The termin
al and modem buffers each conta
in 1250
bytes.
Th
e
hi
gh
water mar
k
is
reached when the buff
er
is
70% f
ull
(875 characters)
and the low water mark is reach
ed when
the buffer is 8
%
fu
ll ( 10
0
characters)
.
2.3
.3
Escape Sequenc
e
Detectio
n
Th
e
S
2
registe
r
holds the dec
imal value of the ASCII code used
b
y
the modem for th
e
escap
e
character. Th
e
factory
default character i
s
a"+
"
(S2
::;;43).
Detecti
on o
f
the.escape
sequence
c
an be disabled
by settin
g
th
e
S
2
register
to a value
greate
r
th
an 127.
When th
e
escap
e
sequenc
e
is executed, th
e
escape
characte
rs are also
transmitt
ed to the
telephone
lin
e
in
all modes. The
escape sequen
ce
(
+++)
i
s
onl
y
applicabl
e
in online da
ta mode.
2.3.4 Break Detection
The Executive Series c
an de
tect a BRE
AK
signal
from either the DTE or the remot
e
mode
m. The AT
\Kn comman
d determines the modem
res
ponse
to a received BRE
AK
signal
.
A BREAK is cause
d
b
y a s
trin
g
of continuous start bits
approximatel
y
300
milliseconds
long,
o
r
by
th
e
Li
nk
Attention PDU in
MNP
.
11
Page 8
2.3.
6
Telephon
e
Line Monitorin
g
1
2
The Direct mode allows data to be transmitted and received
directl
y
from either
the
.
DTE or the remote modem. - Direct mode is selected with the AT &QO or AT\N
l
command.
1
3
2.4
V
.42 I V.4
2
bis
V
.42 supports two methods of error correction: LAP-Mand as a f
allbac
k
option
,
MNP
4 (s
ee Section 2.5). The Executive Series use
s
negotiatio
n
techniques
t
o
determine
an
d
�
stablis
h
the erro
r
correcti
o�
protocol to be used between the modems.
This
tec
hniqu
e
involves two phases: detection and
negotiation
.
In the detecti
on
phase
,
whic
h
occur
s
imm
ediately after the establishment of the modem
handshake,
the
communicating
modems
exchange a sequence of detection patterns to
verif
y
that bo
th side
s
suppo
rt
th
e
error-correction
technique.
In the
negotiatio�
phase,
w�ch follo
"".
s
the detection
p�ase
,
th
e
communica
tin
g
modems exchange configuration informatio
n
regardin
g
dat
a
compressi
on
methods to be
used
.
These commands are described in more detail in later sections
.
%Sn -- Maximu
m
S
tring Length
%Dn --
Dictionary
Siz
e
%Mn--
One/Two-Way Compression
Mod
e
S36 -- V.42
Negotiation
Fallbac
k
S
46
-
r-
Protocol Selectio
n
848 -- V.42
Negotiation
Action
S
82 -- Break
Handli
ng
886 ·· Connection Failure Cause Code
The following S
register
s
are used for V.42 LAP-M
operation:
If
the detection phase fails, o
r
negotiation
does not achieve the desire
d
connection
t
ype
the Executive Series c
an han
g
up
,
f
allback to
MNP, or f
allback to a s
tandard
non-erro
r-
correcting asynchronous mode. The desired action is determined
from the informatio
n
hel
d
in
the S
36 register. Since MNP does no
t
suppo
rt
a detectio
n
phase
,
the selecti
on of
MNP
4
mus
t
be made as a forced fallback with
register
s
S
48 and S36
.
Three addition
al "AT" commands allow selectio
n of V.42
bis
(B1LZ
)
negotiatio
n
parameters
,
i.e.,
maximu
m
s
tring len
gth
,
diction
ary
size, and
compressi
on
direction
:
I
f
optioned
b
y
th
e
A TY
O
command, the modem disconnects
after
receiving
1.
6
+I·
10% seconds of continuous SPACE.
If
optione
d
b
y
th
e
ATY
O
command, the modem send
s
4
+I·
10
%
seconds of continuous SPAC
E
if
the DTR goes O
FF or
if
ATH
is received from the D
TE ..
If
c
arrier is not detected for the
period
of time
specifie
d
in
th
e
S
lO
register,
the modem disconnects from the line.
2.3.7 Retrai
n
2.3
.8
Synchronous
Data Mod
e
The Executive
S
eries
c
an
establish
a
synchronous
connection by following one of the_:
-
-·
:
.
• : .
•
_
methods
describe
d
in
the
AT&Mn
o
r
AT&Qn
command On
ce the modem completes
the-.:·-_-,
physical
handshake
,
it enters
the
synchronous
data mode. During synchronous data mode, the - ·
inactivity
timer i
s
inoperative
.
A
t
2400
bp
s
o
r
greate
r
when the automatic
adaptive
equaliser c
annot compensate
.for
:
·
lin
e
changes,
a
modem can los
e
synchronisati
on
with the received
line signal
.
If
this occur
s
retraining
ma
y
b
e
necessary
to recover fro
m the condition. The ne
ed for a retr
ain depends on
th
e
typ
e
of c
onnection.
Error-Correctio
n
Connectio
n
(MNP,
V.42). The Executive Series initiates a retra
in
if
any _
_
individual
frame
is retransmitted
3
,
6 or 9 times. The modem initiates a retrai
n before
·
attempting
the
fo
urth,
seven
th or tenth re-
transmission.
Norma
l
o
r
Direct Connecti
on.
When error-correction is not being employed, th
e
F.-xec1:1tive-
-.
Series
continuous!
y
monitors the
lin
e
quality
.
If
the
quality
becomes unacceptable, th
e
initiate
s
a retrain.
It con
tinues t
o
try
to retr
ain until an acceptable connection is acmevear
event
that causes
telephone
line disconnection occurs (carrier detect loss time
r
inactivity
timer,
DTR
drop,
o
r
commande
d disconnect); or
if
three consecutive mumcces:sfu1l;·:
.
retrai
n
attempts
occur.
Receive
Space
Disconnect
-
Send
Space
On Disconnect
-
Loss Of Ca
rrier
-
The Executive Series modems monitor th
e
telephone
line and take the described actions
when the indicated conditions occur
.
When
operatin
g
in Direct mode
,. no flow control characters are
recognised
o
r
transmitted,
and the Executive Series cannot execut
e
MNP
sessions. Th
e
purpos
e
o
f
the
Direct mode is to make the modem "dumb" fo
r
compatibility
with other older
style
modems
.
2.3.5 Direct Mode
Page 9
S48 - V
.42
Negotiati
on
Action
S46 - Protocol Selectio
n
S
36 - V
.42
Negotiatio
n
Fallbac
k
Expedited: Modem sends a break
immediately;
data
inte
grity
i
s
maintained both ahead of and after the break
.
Destructive: Modem sends a bre
ak
immediately
;
dat
a
being
processed by each modem at the time of the break is
destroyed.
In
seq�ence:
Modem sends a
bre
ak in
sequence
with
an
y
transmitted data; data
inte
gri
ty
is maintain
ed both ahead of an
d
after the break.
1
5
Normal disconnect, no error occ
urred.
Loss of carrier
.
V.42
negotiati
on
failed to detect
an error-correction modem a
t
the other end.
Other erro
r
correctin
g
modem did no
t
respond
to featur
e
negotiation message
sen
t
b
y
Executive Series
.
The modems could not locate a common
protocol.
N
ormal disconnect initiate
d
b
y
the remote modem
.
Remote modem does no
t
respon
d
after 10 re-transmissions of the
same
message.
Protocol violation
.
S82::3
S82=
7
S82=128
S86=
0
S86=
4
886:5
886=6
S86::
9
S86=12
886=
13
S86:14
LAP-M spec
ifies thr
ee methods of bre
ak
signal
handling:
"
in
sequence"
"
d
i
d
"
d
"
d
·"Th
b akh
-
.
,
expedited",
an estrucnve . e re
andhng options
for LAP-M are selected wi
th
registe
r
882
.
S82
- Break
Handling Options
886 - Connection Failure Cause Code
.
When the modem issues a NO CA
RRIE
R
response message,
a failure code i
s
writte
n
t
o
registe
r
886. S86 records the
first event that contributes to a NO CARRIE
R
messag
e
Th
result codes stored i
n 886 are
:
·
e
1
4
Disable
negotiation; by-pa
ss
the detection and negotiati
on
phases;
an
d
proceed
with LAP-M
.
Enabl
e
negotiation
.
Disable
negotiation
;
by-pass
the detection and negotiati
on
phases
;
an
d
proceed
at once with the f
all back actions specified
.
in 836. This
option
can be used
to
force
MNP
.
Mode
m
hangs up
.
Mode
m
stays
on-
line and a Direct mode connection is established
.
Reserved.
Mode
m
stays
on-line and a Normal mode c
onnection i
s
established.
If
S48 is 128, then an MNP connection is
attempted;
i
f
it
fails
,
th
e
modem disconnects.
If
S48 is 128, then an MNP connection i
s
attempted
;
if
it
fails,
a
Direct mode connection is established
.
Reserved
.
If
848 is 12
8, then
an
MNP connection i
s
attempted
;
if i
t
fails
,
a
Normal mode connection is established.
S48=7
848::128
S48=0
836=6
S36=
7
836
:::
5
836=0
S36=
1
S36=2
S36=
3
S36=
4
Th
e
negotiation
proces
s
determines the
capabilitie
s
of the remote modem.
when the
capabilities
of the remote modem are known and negotiation is unnecessary
,
process
c
an be
bypass
ed
if
desired. The
following options
are selectable using registe
r
Th
e
followi
ng
actions can
be selected with the S46 register
:
546::136
Execute LAP-M
protoco
l
with
no B1L
Z
compression.
846::138 Execute LAP-M
protocol
with B1LZ compression
.
These f
all back
option
s
are initiat
ed immediatel
y on connection if register S48=128.
In
additio
n
to B1LZ
(V
.42
bis),
the Executive Series als
o
implement
s
MN
P 5 dat
a
compression.
B1LZ is used
only
wi
th LAP-M; MNP 5 is used only with
MNP 4. This meth
od
i
s
b
y
f
ar the
mos
t
preferre
d
an
d
compatib
le
implementati
on
of V.42
bis
and V.42 protocols
.
836 can
be used
in
conjunctio
n
wi
th S48=128 to force an
MNP connection. For
example
,
if 836=5 or 7 and S48=128,
an MNP connection wi
ll be negotiated.
2.4.
1
S Register
s
�
egister
S
36
specifi
es
th
e action to take when the desired connection c
annot
be
made.
Th
e
opuons
are:
Page 10
2.4.2 AT Command
s
ATWn •
Negotiation Progr
ess
Reporting
The ATWl command enables the
following
additional
negotiation progress
messages
:
Numbe
r
Verbos
e
Connecti
on Indicated
7
7
PROTOCOL: LAP-M
V.42LAP-
M
8
1
PROTOCOL: V.42BIS
V.42 LAP-M with BTL
Z
The ATWO command disables these messages.
AT%Sn - Set Maximu
m
String
Lengt
h
(BTLZ
)
Set
s
the maximum number of characters that can be compressed into one token. The
default is 32 characters
.
AT%Dn • Set
Dictionary
Size (BTLZ
)
Sets the BTLZ
dictionary
size.
Command
Dictionarv Si
ze
%DO
5
12
%Dl
1024
%02
204
8
%03
4
096
When
one-way
compression
mode is selected (AT%Ml or AT%M2), the loc
al and
remot
e
modems must
be
co-operativel
y
configured,
i.e.,
one must be set for one-way encode
an
d
the other for
one-way
decode. Even
though
only four options of dictionary size c
an be
select
ed
by
the
host,
the modem c
an
negotiat
e
for an
y dictionary size including non-power-of
-
two
valu
es from 512 to 4096 en
tries.
Diction
ary
size up to 20
48 en
tries is
allow
ed for both .
one
-
an
d
two-way
compression.
A
diction
ary
size larger than
2048 entries is allowed for one
-
way compressi
on
only.
AT%Mn - Set
Oneffwo-Way Compression
Mod
e
Selec
ts
th
e
one/two-way compressio
n
mode when using BTLZ compression
.
AT%P - Clear B
TLZ Dictionary
T
his
command
reset
s
the BTLZ encoder
diction
ary
and simultaneously sends a
comman
d
code to the remote modem to reset its BTLZ decoder dictionary.
1
6
2.5 Microcom Networking Protoco
l
(MNP)
MNP is a data link protocol that uses error detection
algorithm
s
to ensur
e
dat
a
integrity.
2.5.1
Compatibility
The Executive Series supports Ml\1P classes
2
through
5. Class 5 use
s
a
dat
a
compression algorithm to increase data
throughput
and is enabled
b
y
the AT%CI
command
,
The AT commands an
d
S
registers
applicable
to M
NP are
:
Comman
d
Functio
n
AT%Cn
Compressi
on
Control
AT&On
Enable Error Correcti
on Mod
e
ATWn
Nezotiation Progress Reno
rtin
a
AT\A
n
Maximum MNP Block Size
AT\K
n
Bre
ak Contro
l
AT\L
n
MNP Block Transfer Control
AT\N
n
Operation Mode Control
AT\
O
Orizinare Reliabl
e
Li
nk
Contro
l
AT\Tn
Inactivi
tv Timer Contro
l
AT\
U
Accent Reliable Mode Control
AT\
Y
Switch To Reliable Mode
AT\Z
Switch To N
onn
a! Mode
S
36
Negotiation
F
ailure Treatment
S38
Delav Before Forced Han
e: Un
S40
MNP Bit-Manned Ootion
s
841
MNP Bit-Manned Option
s
1
7
Page 11
2.5.2 MNP 3-
W
a
y
Handshak
e
When
establishin
g
the MNP 3-way handshake, the originating modem sends th
e
firs
t
Link
Request
Protocol Data Unit (PDU). The answering modem responds
b
y
sending
a
L
ink
Reques
t
PDU back. The
originato
r
then responds with
a
Li
nk
Acknowledg
e
frame
t
o
complet
e
the MNP handshake
.
Establishi
ng
MNP Connection
s
The Executive Serie
s
may
be
configure
d
to execute th
e
Mi
'U'
handshake before or afte
r
a
tele
phone-based
connectio
n has been established. The AT&QS, AT\N2, or AT\N
3
command
may
be used to
configure
the modem before th
e c
onnection
.
To enter MNP after
a
telephone
connecti
on
in
either Direct or Norm
al mode, use the
AT\0,
AT\Y,
or AT\U command. These three commands have no effect once th
e
3-way
handshake has bee
n
completed
.
A
t
completion
of the
MNP
3-way
handshake, the Executive Series returns
a c
onnect
messag
e
accordi
ng
to the
ATW
n
command setting.
MNP
can only operat
e
a
t
connection
speed
s
of 1200
bp
s
or greater
.
2.5.3 MNP Data Mode
After
establishing
the
MNP
connection, the Executive Series performs
all
of the
functions
require
d
d
urin
g
the Normal data mode with the following differences:
1. Retr
ains ar
e
performed
as a resu
lt ofretransmission rates (See Sectio
n 2.3.7).
2. When in command mode
d
uring
a
n
MNP
connection as a result of the escap
e
sequence
(
+++
)
,
the Executive Series continues to accept data an
d
acknowledg
e
frames. The data is stored until the modem enters the data mod
e
and is then delivered to the DTE. In non-MNP mode, an
y data received whil
e
the mode
m
i
s
in command mode is los
t.
MNP Class 5 Data
Compression
This M
NP
mode
ma
y
be enabled or disabled
by usin
g
the AT%Cn command
.
If
the
Executive Series
establishes a Class 5 connection,
it automati
cally increases its throughput by
compressin
g
data into tokens before
transmitting
to the remote modem, and decompressin
g
encode
d
received
data before
passing
it on to the DTE. The AT%Cl comman
d has
no effect
if
an M
NP
connection ha
s
already
been established
,
excep
t
to configure the modem for a fu
tur
e
MNP
Class 5 handshake
attemp
t.
1
8
Programmabl
e
Inactivity Time
r
.
Th�
Executiv
e
Seri.e
s
ca
n
deter.mine
the length of
time i
t
will
wait
prio
r
t
o
disconnec
ting when
no data is sent or received
.
In
MNP
mode, thi
s
activity
time
r
is reset
whe
n
data is either received from the DTE or is received
from the distant mode
m
in
the fo
rm
of a
L
ink
Transfer PDU. This timer c
an be· set
usin
g
the AT\Tn command where n
represents
a
value between O and
90
minutes
.
Data Transfer
MNP
ma
y
be operated
in
either block or stre
am mode. In stream
mode
,
MNP
sends
data frame
s
in
v
arying len
gth
s
dependin
g
on the am
ount of time betwee
n
character
s
cornin
g
from the DTE. The mode i
s selected
b
y
the A T\Ln command.
In block mode,
MNP
sends data frames of
256
characters
in
length. Special
communication software must
be used when
usin
g
block mode
.
When
a
L
ink
Disconnect
PDU
is r
eceived, the Executive Series reads the curren
t
status
of the
836 register and either falls back to a norm
al
c
onnection,
or disconnec
ts th
e
mode
m
from th
e
telephone
line and
goes
on-hoo
k.
1
9
Page 12
The D
TE is
responsible
f
or
comp
aring
the data received wi
th the data sent fo
r
analysis
2
1
2.6.3 Remote
Digital
Loopback
{RDL)
RDL can only be initiate
d
if
a connection
exists at 1200 or 24
00 bits
per
second
.
Initiatio
n!ferminati
on
Descriptio
n
Results
Descriptio
n
2
.6.4 Remote
Digital Loopbac
k
with Self Tes
t
Remote digita
l loopback
(RDL) is initiate
d
by issuin
g
the AT&T6 command.
Th
e
remote modem must have RD
L
res
ponse
enabl
ed
(AT&T4)
.
Remot
e
digital
loopback
testing
is terminated when the Executive Series r
eceives the test termination comman
d
(AT
&TO
)
o
r
when the test time
r
(se
t
using registe
r
Sl8
)
exp
ire
s
.
Data·
from the local DTE is se
nt to the remote
modem which
loop
s
the data
back
t
o
th
e
local DTE
.
This
test v
erifi
es
th
e
worki
ng condition of th
e
telephon
e
line and th
e
remot
e
modem.
Initiatio
n!ferminati
on
An
intern
ally-generat
ed pattern
is
sent from the local
modem to the remote
modem
which l
oops the da
ta back to the local modem
again
.
This test v
erifies th
e
workin
g
conditi
on
of the
telephon
e
line and the remote modem.
Results
The Executive Series chec
ks for error
s
intern
ally. Up
on
termination of the
test,
th
e
modem sends
a
3-dig
it
error count to the DTE.
Remote digi
tal loopback with self test is
initiated
b
y
issuin
g
a remote
digit
al loopbac
k
with se
lf test comman
d
(AT&T7)
.
The test is terminat
ed when the Executive Series
modem
receiv
es the test te
rminati
on command (AT&TO) or when the test
time
r
(set
using registe
r
SIS
)
exp
ires.
Remote digital loopba
ck wit
h
self
tes
t
(RDI.Sl'
)
can
only
be initiated
if
a connection exists at
·
1200 or 2400 bit
s
per
second
.
...
'i\i.·
.
.
.
.
.
_.
.
.
,
Analogu
e
Joopback
is initiate
d
by issuin
g
th
e
AT&Tl
command and terminates whe
n
the Executiv
e
Series receives the test termination command (AT&TO) or when the "test
-
timer"
(set usin
g
the
Sl8
register)
expires.
Please note: This test will
always drop
a connection
if
one exists
.
Initiation/Terminatio
n
Analogue
Loo
p
back Self Test is initiated
b
y
issuin
?
the AT &T
S
c
o�a�d
.
Analogue
loopback
is terminated
when the Executive Series
rece1v�s
the test re
rmmauon comman
d
(AT
&TO
)
or when the test time
r
(se
t
usi
ng
register S18) expires
.
Please note:
This test w
ill
alway
s
drop
a connection
if
one exists
.
Description
A
n
internally-generate
d
tes
t
pattern
o
f
alternati
ng
ls a
nd Os (reversals) i
s sen
t
_to
the
Executive
Series
.
An error detector within
the
modem checks for errors m the stnng of
reversals. This test verifies th
e
working
condition of the modem
.
Result
s
The D
TE
i
s
responsible
fo
r
comparing
the data r
eceiv
ed with the data sent for test
analysis.
2.6.2
Analogu
e
Loop
back with Self Tes
t
2
0
Results
Th
e
Executiv
e
Serie
s
checks for error
s
internally
.
Upon te
rmination of the test, th
e
modem sen
ds
a
3-dig
it
error cou
nt
to
the DTE
.
2.6.1
Analogue Loopback
Initiationfferminatio
n
Descripti
on
Dat
a
from the local D
TE is sent to the Executive Series, which then loops the data
back to the
local DTE. This test verifies the working condition of the pa
th between th
e
modem and the DTE
.
2.6
Diagnostic
s
The Executive Series
'
diagnostic
s
comply
with EIA recommendation 1R30.2 and
ar
e
implement
ed
as follows
.
Page 13
2.6.
5
Digita
l
Loopback
Descripti
on
Digital
l
oopbac
k
ca
n
be
used to
te_st
the entire l
ink. When digital l
oop
is
request
ed
from
the local
DTE,
two data
paths
are sec
u
p
in
the local modem. Data from the local D
TE
is
loope
d
bac
k
t
o
the local DTE
(Path
1
)
a
nd data r
eceived from the distant modem is
looped
back to the distant modem (Pat
h
2).
In
itiation!fermination
Digital
loopbac
k
is in
itiat
ed
b
y
issuin
g
the
AT&T3
command. Toe test is terminate
d
whe
n
the Executive
Series
receives the test termination command
(AT&TO)
or when the test
time
r
(se
t
usin
g
register
818
)
expires
.
Digital
loopb a
ck
can
onl
y
be initiate
d
if
a connection exists at 1200 or 2400bps.
Resul
ts
Bot
h
the
loc
al
D
TE and the distant DTE are responsible for comp
ari
ng the data
receiv
ed
with the data sent for test analysis.
2.6.6
Asynchronous
Diagnostic Commands
AT&TO
:
Ends
the tes
t
i
n
progress.
If
the test i
n
progres
s
is
AT&Tl
(analogue loopback)
,
A
T
&T3
(digital
Joopback)
,
or A
T
&T6
(remote digi
tal loopback), then an escap
e
sequence
mus
t
be issued
prio
r
t
o
AT&TO
.
Note also that ATH or the expiration
o
f
th
e
"test timer"
818
register
wi
ll also terminate a tes
t.
AT&Tl
;
Initiates
Analogu
e
Loopback
.
AT&T3: Initiat
es
Digital
Loopback.
AT&T4
:
Allows
the
Executive Series to
respon
d
to a distant modem's request for a remote
digita
l
loopback
tes
t.
AT&TS
:
Prohibi
ts
the Executive Series from hono
uri
ng a distant modem's request fo
r
remot
e
digital
loopback
tes
t.
A
T
&T6: Initiates Remote
Digital
Loopbac
k.
AT&T7:
Initiates Remote
Digi
tal
Loopbac
k
with Se
lf Test.
AT &TS: Initiate
s
Analogu
e
Loopbac
k
with Self Tes
t.
2
2
3. "AT" COMMAND
S
Table 3-1 summ
arises the
"AT
"
command set. Toe commands are described
in
greater
detail in Tables
3-2
through
3-5
.
3.1 Command Guidelines
Each
"AT
"
command has a list o
f
possible
parameters
with its default value
.
The
default value is load
ed at
initialisation, i.e.,
power-on
or·
A
TZ
command.
If
a
command
requires
a parameter but none i
s
supplied
,
the Executive Series
assumes
that the
p
aramete
r
is
zero. Invalid command
s
or
parameters resu
lt
in the ERROR
messag
e
bein
g
sent to the DTE
.
Toe command line may cont
ain
a
singl
e
comman
d or a series of commands
.
They
may·
be
separated by a spa
ce for
readability.
Toe command line
ma
y
be
u
p
t
o
25
6
character
s
in
len
gth and is executed after
a
terminating
character is entered. The defaul
t
termina
tin
g
character is a c
arriage return (De
cim
al 13), but this can
be
change
d
by
wri
tin
g
a differen
t
valu
e
t
o
registe
r
83.
Toe command lin
e
ma
y
be edited
using
the
backspac
e
characte
r
(Decimal
8).
Thi
s
value may be set using the SS
register.
However, the
backspa
ce
will
not work for values o
f
Q
an
d
greater
than 127, or for the c
urre
nt value of the
termina
tin
g
character.
All command
lines must
be
gin
with
an "AT" entered
in
capital
or lower case letters. A
command line c
an
be te
rminated at
an
y
time
b
y
issuin
g
CTRL-X
(Decim
al
18)
afte
r
ent
erin
g
the
"AT
"
attention code. To
e command
lin
e
will
be
ignored
and an OK resu
lt
messag
e
will
be
sent to the DTE. Th
e
Al
command
may
be
used t
o
repeat
the last command line. To
e
Al
does
no
t
require
a
terminati
ng
character or the
"AT
"
attention code.
To
e escape code sequen
ce
(
+++)
returns the Executive Series to command mode
fro
m
the data mode. A
tim
e
delay
must occur between the last character transmitted
b
y
the DTE
and the
first character of th
e
escap
e
code
sequence
.
To
e
guar
d
tim
e
delay
c
an
be
change
d
by
alte
ring the value hel
d
in
registe
r
812;
(defau
lt 1 sec
ond). Toe
escap
e
cod
e character
(defau
lt
is ESC, Decim
al 27) must occ
ur
three times
in succession for the Executive Series t
o
recognise
it as a v
ali
d
escap
e
command.
2
3
Page 14
Table 3-1. "AT" Command
Summary
COMMAND
TITL
E
DEFAULT
A
l
Re-Execute Command
non
e
ATA
Answe
r
non
e
ATB
n
Set CCI1T or Be
ll Mod
e
O
*
ATC
n
C
arrier Contro
l
1
ATD
n
Dial
p
ATE
Command Echo
l
*
ATF
n
On-Line State Character Echo
l
*
ATH
n
Switch-Hook Contro
l
none
ATi
n
Identificati
on
non
e
ATL
n
Speaker Volum
e
2
*
ATM
n
Speaker Control
1
*
ATN
n
Modulation Handshak
e
1
*
ATO
n
Ret
urn To The On-Line Stat
e
non
e
ATP
Set Pulse Dial
as Default
none*
ATQ
n
Result Code Displa
y
0
*
ATSn?
Readi
ng S-Re
l(ister
s
none
ATSn-
x
Writing To S-Rel(ister
s
none
A
TI
Set Tone Dial as Defau
lt
none
*
ATV
n
Result Code Form (Message Control)
1
*
ATW
n
Negotiation Pro
zress Reporti
ng
O
*
ATX
n
Extended Result Codes
4
*
ATY
n
Con
trol Lo
ng Space Disc
onnect
·
O
*
ATZ
n
Reset
non
e
AT&Cn
DCD Option
O
*
AT&Dn
DTROpti
on
O
*
AT&
F
Restore Factory Configuration
none
ATG
n
Set Guard Ton
e
O
*
AT&Jn
Telephone Jack Selecti
on
O
*
AT&Kn
DTE/Modem Flow Control
3
*
AT&Ln
Line T
vpe
O
*
AT&Mn
Communication Mod
e
(&On)
*
AT&
Pn
Dial Pulse Ratio
0
..
AT&On
Communication Mode
5
*
AT&Rn
RTS/CTS Optio
n
O
*
AT&Sn
DSR Optio
n
O
*
AT&Tn
Test And Diagnosti
c
4
*
AT&
V
View Current Configuration And Profil
e
non
e
AT&Wn
Store User Profil
e
non
e
AT&Xn
Clock Source Selectio
n
O
*
AT&Yn
Desianate Default User Profil
e
O
*
AT&Zn-x
Store Phone Number
non
e
2
4
Table 3-1. "AT" Command
Summary
(Cont'd
)
COMM
AND
TITL
E
DEFAUL
T
AT\A
n
Maxim
um
MNP Block Siz
e
3
AT\Bn
T
ransmit Bre
ak
3
AT\Gn
Modem-To-Modem Flow Control
0
AT\
Kn
Bre
ak Contro
l
5
AT\L
n
MNP
Block Transfer Control
0
AT\N
n
Oneration Mode Control
none
*
AT\
O
Ori
zinate Reliable Li
nk Contro
l
non
e
AT\Tn
Inactivi
ty Time
r Contro
l
O
*
AT\
U
Accent Reliable Mode Con
tro
l
non
e
AT\Y
Switch To Reliable Mode
non
e
AT\Z
Switch To Norm
al Mod
e
none
AT%Cn
Compression Control
1
*
AT%Dn
Set Dictionarv Si
ze
<BTLZ
)
2
AT%En
Enabl
e/Disable Auto-Retrain
0
AT%
L
Reoo
rt Received Sign
al Level
non
e
AT%Mn
SetOne{fwo-Wav Mod
e
<B
TLZ
)
3
AT%
P
Cle
ar BTL
Z Encoder Dictionary
non
e
AT%
0
Report Line Signal Ouali
tv
non
e
AT%Sn
Set Maximum String Lene:t
h
(BTLZ)
3
2
*
Command is
sav
ed
in
NVRAM
.
Parameters enter
ed for the AT and AT& commands are
limited
in value to
255,
where
the parameter is "MOD"ed with 256. The resu
lt must
be
with
in th
e
spec
ified range
;
if
it is
not,
the ERROR
messag
e
is sen
t to the DTE.
P
arameters entered for S registers are also "MOD"ed with 256 and the result i
s store
d
in the S register. Parameters that are out of
rang
e
are store
d
in
the S
register,
however
,
n
o
ERROR message i
s sent to the DTE.
Functionall
y
however, the lower or
highe
r
limit
is
observed.
Parameters enter
ed for the AT\ and AT% commands follow the same
method
,
excep
t
that should the parameter
be out of range, the
uppe
r
limit i
s stored and no ERROR
messag
e
i
s
sent to the DTE
.
2
5
Page 15
DES
CRIPTION
Table 3-
2. "AT" Command Definition
s
Set
CCITT
or Bell Mode. Selects between CCITT and Be
ll mod
es for 2400. 12
00 and
3
00
bps.This
command is not valid when the ATNl command (automode detection
enabled) is in effec
t.
2
7
Table 3-2. "AT" Command Definition
s
(Cont'd)
COMMAN
D
DESCRIPTION
Dial. This must
be
the last command on a command line. A TD causes the
modem
to
off-
hook, dial
accordi
ng to the paramete
rs entered, and
attempt
to
establish
a
c
onnection.
g
o
ATD
n
If
th_er
e
are n
o parameters, then the modem
goes
off-hook in
originate
mode
withou
t
dialling a number
.
.
Punctuati
on ma
y
be
used for
cl
arity. Parentheses
,
hyphens
an
d
spaces
are i
gnore
d.
l
f
a
n
invali
d
character is entered, that charact
er and all
subsequent
character
s
in the dia
l
s
tring
ar
e
ignored.
Parameters
:
0-9 A B C D
• # L P T
R
!
@
W , ; A S=n
Default:
p
Resu
lt
Codes
:
O
K
if";
"
dial modifier is used
.
O
K
if key press abort
d
uri
ng
dialling.
NODIALTON
E
i
f
A TX2
or A TX4 i
s selected and 1 sec
ond
of dialtone is not detect
ed wi
thin
5
seconds;
or i
f W dial modifier is used and 3 seconds·
of dialtone is not detected within the tim
e
specifi
ed by S7
.
BUS
Y
if
busy is detected, and A TX3 or A TX4 is
select
ed or
if
W dial modifier is used.
NOANSWF.
R
i
f
"@"
di
al modifier is used and 5 secon
ds
of silence is not detec
ted within the time
specified within the time
spec
ified
b
y
S7.
CONNECT XX
XX
if a connecti
on is established
.
NO CARRIE
R
if a connection cannot be established, the
abort timer (S7) expires
, or a character i
s
enter
ed during the handshake
process
.
ERRO
R
if i
n data mode
.
The A TD parameters are
:
L
Dials the Last di
al
s
tring
that was dialled.
p
Use Pulse dialling. Placed at th
e end of the comma
nd
s
tri
ng
an
d
before the di
al string. Causes the modemt
o
puls
e
di
al the
numbers
.
T
Use DTMF di
alling. Pl
aced at the end of the command
s
tri
ng
and before the dial
s
tring.
Causes the modem t
o use DTMF tone
s
to dial
.
R
Reverse Mode. Allows the Executive Series to call an
originate-
only mode
m
b
y
forcing the call into "answe
r mode". Must b
e
entered as the last ch
aracter of th
e comma
nd
s
tring (just
before the
<CR>).
!
H
ooktlash. Caus
es the modem to
go on-hook for
700 millisec
ond
s
and then off-hook .
.
@
Causes the modem to listen fo
r 5 seconds of silence.
If
a 5 second
silence has not been detected within the
peri
od
specified
in S
7
(default= 30 seconds), the modem disconnects and returns th
e
'NO ANSWER' resu
lt code
.
If
it detec
ts
a
busy
signal
,
it returns a
'BUSY' result code
.
If
the 5 seconds of silence is
detected
,
th
e
modem continues
dia
lling
the dia
l
s
tring.
w
Wait For Dialtone Befo
re
Dia
lling.
Causes the Executive Serie
s
to
wait for a dialtone
up to the peri
od of time
specified
i
n
registe
r
S
7
before dialling the numbers that follow
.
If
the modem detects
a
dial tone before the given time
delay
,
it continues to dial
.
Otherwise, i
t
goes
on-
hook.
'
Pause Duri
ng Dial. Inserted between
digits
in a dial
string.
Causes the modem t
o pause for the valu
e
given by register
S
S
(defau
lt is 2 seconds)
, befo
re
dia
lling
the nex
t
digit.
Thi
s
delay
ca
n
be
used in place of the "Wait For Dialtone Before Diallinz
".
if in data mode.
if a c
onnecti
on
i
s
establish
ed
(
XXXX
=
telep
hon
e
line speed,
e.g., 9600).
i
f
a connection cannot
be
established
,
the abort time
r
(register
S7)
expires
or i
f
the command is aborted,
for a
ll valid
parameters
.
otherwise.
Selects CC!Tf V.3
2
bis
,
V.32, V.2
2
bis
,
V.22
and V.21 s
tandards for communication at
14400, 9600, 2400, 12
00 and 300 bps
.
Selects Bell 212A and
103 standards fo
r
communicati
on at 1200 and 300 bps
.
fo
r
1.
otherwise
.
Not
permitted
;
returns ERROR resul
t.
Norm
al transmit carrier switching.
2
6
0
,
l
l
O
K
ERROR
ATC
O
ATC
l
ATB
l
0
,
I
0
O
K
ERRO
R
ATB
O
ERRO
R
NO CARRIE
R
Comma
nd
Options:
Parameters:
Default
:
Result Codes:
Parameters
:
Default:
Rem
it
Codes
:
Command Options
:
Carrier Contro
l.
Controls the transmit carrier. The Executive Series is preset
to
tu
rn
c
arrie
r
on and o
ff as
n
ecess
ary
(th
e
Cl option). The sign
al is
on when the modem i
s
calling, answering
,
or connected
to
a remote modem, and is off when it is no
t. The C
O
optio
n
is NOT valid.
Answer. This must
be the last command entered into the command line. The Executiv
e
Series
proceeds
with the connect sequence in answer mode
.
It
w
ill enter the connect state
afte
r
exchanging
carrier with the remote modem.
If
no carrier is detect
ed within a wait
peri
od
specified
i
n
register
S7 (default is 30 sec
onds), the modem will disconnect.
An
y
characte
r
may
be entered via the DTE during the connect sequence to abort the command.
Parameters
:
None.
Default:
None.
Resu
lt
Codes
:
CONNECT XXXX
Re-Execute Comman
d.
Re-execute
s
the most recent AT command stri
ng. Th
e
principl
e
application
of this command is to
place
another call (e.g. Dial command) that failed
t
o
c
onnect due to
a
bus
y
line or
no answer. This command must appe
ar alone on a comman
d
lin
e and must
be terminated
b
y
th
e
'
f'
characte
r.
(
A
<CR> s
hould not b
e entered
to
terminate the command
.
Parameters:
None.
Default:
None.
Al
ATA
ATC
n
ATB
n
COMMAND
Page 16
Table 3-2. "AT" Command Definitions (Cont'd)
COMMAND
DESCRIPTIO
N
;
Return To Command Mode After Dialling, Added
to
th
e end of
a
ATDn
dia
l
s
tring
.
Causes the mode
m
to
remain in the command mod
e
(cont'd)
after
it dials the
digits preceding
the command. This allows the
user to issue additional dial commands or
di
al
s
trings
without
ove
rflowin
g
the comma
nd buffer. The modem looks for carrier
after the final dial command is issued. "ATHn" aborts thi
s
command.
II
T
urn On
Calling
Tone. Tums on a periodic 13
00 Hz
ca
lling
ton
e
i
f
originati
ng
the call.
Ca
lling
tone is enabled
onl
y
on a
call-by
-
call basis
.
S:n
Dial Stored Number. Follows the di
al comma
nd
s
tring
.
Cause
s
the Executive
Seri
es to dial a telephone number
previously
stored
in
directory
locatio
n n
using
the AT &Zn command
.
If
"ATD"
is entere
d
withou
t
p
arameters,
the Executive Series goes off-hook and wai
ts for
c
arrier;
if the handshake is not
complete
d
within the time specified by register S7 (default=
3
0
seconds
)
the modem goes on-
hook
.
.
The
.
A
T
D
command wi
ll
be
aborted in progress
upon receipt of any character fro
m th
e
D
TE before the completion of the handshake.
Comman
d
Echo.
Comrols the ec
ho of characters r
eceiv
ed by the Executive Seri
es fro
m
the local D
TE while the modem is in the command mode.
ATE
n
Parameters:
0, I
Default:
I
Result Codes:
O
K
for O and
I.
ERRO
R
otherwise.
Command Options
:
ATEO
Inhibi
ts the echoing of commands.
ATEl
Enables the echoi
ng of commands.
On-Line State Character Echo.
Determi
nes if the Executive Series w
ill echo da
ta fro
m
the DTE.
The modem does not
s
upport
the A TFO comman
d. However, A TFl is accepted
,
ATF
n
which
may
be
issued
b
y
some communicati
on software packages.
Parameters
:
n
=0,
l
Default:
I
Resul; Codes
:
O
K
fo
r
I.
ERRO
R
otherwise
.
Command Options
:
ATF
O
E
rror.
ATF
l
Disables on-line echo.
Switch-Hook
Control.
Applie
s
t
o
asynchronous
operation only. If the user enters th
e
command
mode from the data mod
e
by
issuing the escape
sequence(+++), or as a resul
t
of
A
TI-In
an ON-to-OFF
transitio
n of D
1R with the AT &Dl option in effect, the user may cause the
modem t
o
g
o
on-
hook
(disconnect
)
by issui
ng the ATH command
.
Parameters:
n
e
O, l
Default:
None.
Res111/ Codes:
O
K
for O and
I.
ERRO
R
othe
rwise.
Command
Options
:
ATH
O
Caus
es modem lo
go
on-
hook (hang up).
ATH
l
If
mode
rn is on-
hook, modem goes off-hook,
returns an OK
r
esponse.
a
nd awaits f
urthe
r
commands.
2
8
.
t
JJ
::.
Table 3-2.
"AT
'
Command Definitions
(Cont'd
)
COMMAND
DESCRIPTION
l()entification
.
Returns the product code, returns the checksum of the firmware
ROM
,
o
r
computes th
e checksum of the firmware ROM and
repo
rts
its error
status
.
ATi
n
The product
code contains 3 digits. The checksum result consists of three
ASC
H
numeri
c
c
haracters followed by
a
carriag
e
retu
rn and a line feed
.
The error status is either OK or
ERROR.
Parameters
:
n=O -4
Default:
None
.
Result Codes:
O
K
Comman
d
Options
:
ATIO
Reports the product code.
ATll
Reports the checksum
computed
on the firmwar
e
ROM in 3-digit deci
mal notation.
ATI2
Performs
a checksum on the firmwa
re ROM and
indicates
OK or
ERROR
ATI3
Firmwar
e
(ROM)
r
evision number
.
ATI
4
Identifi
es pr
oduct features fou
nd in the Executiv
e
Seri
es modem
.
Speaker Volume. This co
mmand is included fo
r
compatibility
purposes ·onl
y - s
peaker
volume in the Executive Seri
es is adjustable via a small
potentiometer
inside the uni
t.
ATL
n
Parameters
:
n=O - 3
Default:
2
Result Codes:
O
K
forO to 3.
ERRO
R
othe
rwise
.
Comman
d
Options:
ATLO
Selects low s
peak
er volume.
ATL
l
Selects low speaker volume
.
ATL2
Sel
ects medi
um
s
peaker
volume
.
A
TLJ
Selects
high speaker
volume
.
Speaker Control.
Controls the intern
al
speaker while the Ex
ecutive Seri
es is
receiving
a
ca
rrier sign
al or dialling. This command also enables or disabl
es the
s
peaker
.
ATM
n
Parameters
:
n= 0- 3
Default
:
l
Result Codes
:
O
K
forO to 3.
ERRO
R
otherwise.
Command
Options:
ATMO
Speaker i
s
always
o
ff.
ATM
l
S
peaker is on whils
t
diallin
g,
the
n
goes
o
ff while
the Executive Series is receiving a carrier from
a
remote modem.
ATM
2
S
peaker is
always
on
.
ATM3
S
peaker goes o
ff while the mode
rn is
receiving
a
c
arrier
signa
l
from a remote modem and whil
e
the mode
rn is
dialling.
2
9
Page 17
3
0
mod
e a
nd to initiate a retrain
.
DESCRIPTI
ON
Allows short-fo
rm (numeric) result codes to
be
sen
t.
Allows
long-fo
rm
(verbose
)
resu
lt
codes to be sen
t.
othe
rwise
.
fo
r
0
.
for 1.
fo
r
parameter
s
n = O • 9 5
.
for no argument.
otherwise.
otherwise
.
Allows the modem to send resu
lt codes to th
e
DTE.
Prohibits the modem from sending result codes to
th
e
DTE.
Modem returns result codes to the D
TE when
originatin
g
a call; does not re
turn result codes when
answerin
g
a call
.
fo
r O and
2
.
for l.
fo
r
all
v
ali
d
parameters.
ERRO
R
ATQ
2
None.
ERRO
R
ATQ
O
ATQ
l
Reads the contents of the
S
register
.
Al
l S registers may be read
.
n
=
0 - 9
5
None
.
O
K
Command Options
:
Result Code Form
(Message
Control). Selects whether the Executive Series sends lon
g
fo
rm
o
r
sho
rt
fo
rm re
sult codes to the local DTE. All responses are ASCII values. L
ong
-
form
(verbose) response
s
ar
e
precede
d
a
nd te
rminat
ed with bo
th carriage return and lin
e
feed control characters. Short-fo
rm (numeric) responses are only te
rminated with
a
carriage
return control character. (See A TXn command.)
Parameters
:
0, l
Default:
I
Result Codes
:
0
O
K
ERRO
R
ATVO
ATV1
Comman
d
Options
:
Writin
g
To S
Registers.
Writes the value of x to the specified S register. All register
s
w
ill re
turn the OK
respons
e
if x is a
legal
value, however some registers will not a
ctuall
y
write the valu
e
anywhere.
Thes
e
register
s
are
Si,
S13-S15
,
S17
,
S20-S24 and S27
.
Parameters
:
n
=
0 - 9
5,
x
=
0 • 2
55
Default
:
None
.
Result Codes:
O
K
O
K
DESCRIPTION
S
et Tone Dial As Defaul
t. Causes the Executive Series to assume that
all
subsequent dial
comman
ds are tone dialled. The use
r
may subsequentl
y
omit
th
e
"T" fro
m the dial string
.
Parameters:
None.
Default:
None.
Result Codes
:
O
K
if issued outside dial string
.
Reading S Registers.
Parameters
:
Default
:
Result Codes:
3
1
Table 3-2. "AT" Command Definition
s
(Cont'd
)
Result Cod
e
Display
.
Determines whether or no
t the Executive Serie
s sends the result
codes to the DTE. (S
ee th
e A TXn command.)
Parameters:
n
=
0, 1, 2
Default:
0
Result Codes
:
O
K
A
TT
ATQn
ATVn
ATSn?
ATSn=
x
COMMAN
D
if retrain is not successful in the tim
e
specified
b
y
87.
Causes the modem to return to data mode
.
Causes the modem to return to the dat
a
otherwise
.
Requires
that the spee
d of the connectio
n be tha
t
specified
by the value held in S37;
i
f
S
37
=
o
,
the
speed
of the connection must match that at which
the last AT command was issued.
If the selected
spee
d
can be achieve
d using more than one
communication standard
(e.g.
,
Bell 2!2A or
CCITT V.22 at
1
200
bps), the modem als
o
references the selection made with the A T
B
command
.
Enables automode detection. Permits
handsh
aking to
occur
at any speed supported
b
y
both modems. The A TB command is
ignore
d
i
n
this mode and the modem
attempts onl
y
CCITT
mode connections
.
fo
r O a
nd
I.
ATO
O
ATO
l
ATN
l
Comman
d
Options
:
Set
Pulse Di
al
As Defaul
t. Caus
es the Executive Series to assume that a
ll subsequent dial
commands
ar
e
puls
e
dialled. The use
r
may
subsequently omit the
"P"
from the dial strings
.
Parameters
:
None.
Default
:
None.
Resu
lt
Codes:
O
K
if issued outside dial string
.
Retu
rn
T
o
The On-Line State
.
Applies
to a
synchronous operation only. lfthe user enters
the comman
d
mode
from th
e
da
ta
mod
e
b
y
issuing the escape sequence, or as a result of
an
ON-to-O
FF
transitio
n
o
f
D
TR
with the AT &Dl option in effect, the user may re
turn to the
dat
a
mod
e
withou
t
terminatin
g
a
ca
ll
by issuing the A TO command. This command
ma
y
also
be
used t
o
force
a retrain.
If
the Executive Series is on-hook, then it behaves
a
s
if
i
t
wen
t
off-hoo
k
t
o
originate
without ac
tually taking the rela
y off-hook.
Parameters
:
0,
1
Default:
None.
Resul
t
Codes
:
ERRO
R
if &Tl, &T3
, or &T6 • &T8 is active.
CONNECT
XXXX
if a connection is established.
NO C
ARRIE
R
Table 3-2. "AT" Command Definitions
(Cont'd
)
Command
Options:
Modulation Handshake. This comma
nd ca
n
be
used lo assure that a connection is made
onl
y
at the
specified
speed
.
If leased line is selected, this command i
s
ignored
and
the
Executive Series
operate
s
a
s
if
A TN
O
were selected.
Parameters:
0, I
Default:
I
Result Codes
:
O
K
ERRO
R
ATN
O
ATO
n
ATP
ATN
n
COMMA
ND
Page 18
3
2
DES
CRIPTION
Table 3-2. "AT" Command Definition
s
(Cont'd)
fo
r O and
1.
othe
rwise
.
Disable
long spa
ce
disconnect.
Enable l
on g space disconnect.
o
,
1
0
O
K
ERRO
R
ATY
O
ATY
1
Control
Long Spa
ce
Disconnec
t.
Determine
s
whether the Executive Series disconnects
when it receives a continuous bre
ak from a remote modem for a period equ
al to, or greater
than,
1.
6
seconds,
and sends a break for 4 secon ds before disconnectin
g due to an ON-to-
O
FF transition of DTR
if
a
n
AT&D2
optio
n
is in effect, or upon receipt of
an AT
H
conunand
.
Table 3-2. "AT" Command Defin
ition
s
(Cont'd
)
Reset. Causes the Executive Series to disconnect a
nd performs a warm start. This
command must be
th
e
last command on the command line. The reset actions are
:
• Clear seri
al
port
buffers.
• Set the baud rate and
parity
to match the local DTE when any AT command is issued
.
• Restore the active
co
nfiguration
with the use
r
profile
denoted by the parameter.
Parameters
:
0,
I
Default
:
0
Result Codes:
O
K
fo
r O and
I.
ERRO
R otherwise
.
3
3
DES
CRIPTION
Command
Options:
Parameters:
Default:
Result Codes
:
Result codes -
Q
,
V, W
,
X
,
S95
ATZ
n
ATY
n
ATX
n
Numeric
Verbal
(cont'd
)
0
OK
I
CONNECT
2
RIN
G
3
NO CARRIE
R
4
ERRO
R
5
CONNECT 1
20 0
6
NODIALTO
NE
7
BUS
Y
8
NO ANSWE
R
9
CONNE
CT
06 00
1
0
CONNE
CT
24 00
11
CONNE
CT
48 00
1
2
CONNE
CT 96
00
13
CONNECT 720
0
1
4
CONNECT 120 00
1
5
CONNECT 14400
1
6
CONNECT 19
20 0
17
CONNECT 38400
1
8
CONNE
CT 576 00
40
C
ARRIER3
00
-46
CARRIER 120
0
47
C
ARRIER 2
40 0
4
8
C
ARRJER 4
800
4
9
C
ARRIER 72
00
5
0
C
ARRIER 960
0
5
1
CARRIER 1
20 00
5
2
C
ARRIER 14400
6
6
COMPRESSION: CLASS
5
6
7
COMPRESSION: V.42BI
S
6
9
COMPRESSION: NO
NE
7
0
PROTOCOL: NONE
77
PROTOCOL: LAP-M
8
0
PROTOCOL: ALT
COMMAND
Error-correction call
progress
no
t
reported.
Error-correction call
progress
reported.
Error-correction call
progress
no
t
reported
.
CONNECT
XXXX
messag
e
report
s
DCE
speed
.
fo
r
parameter
s
O
•
2
.
othe
rwise
.
fo
r
parameter
s
O
-
4
.
otherwise
.
Executive Serie
s
i
gn ore
s
dialtone and
busy
signa
l. Sends CONNE
CT message when a
connection is establishe
d
b
y
blind
dialling
,
Mode
m
ignore
s
dialtone an
d
busy signa
l.
Sends
CONNE
CT
XXXX
message reflecting
bit rate
when a connection is established
by
blin
d
dialling.
Mode
m
ignores bu
sy signal
but wait
s
for dialtone
before dia
lling
.
If
dialtone is not detected within
5 seconds
,
the
NO D
IALTONE
message
is sen
t.
Sends CO
NNECT
XXXX
message reflectin
g
bit
rate whe
n a connection is established.
Modem
ignores
dialtone. Sends BUS
Y
messag
e
if
a
busy signa
l
is detected. Sends CO
NNECT
XXXX
message refle
cting
b
it rate whe
n
a
connection is established by blind dialling
.
If
dialtone is not detected withi
n 5 seconds, send
s
NO DI
AL TO
NE
message
.
If
busy
signa
l
i
s
detected
,
sends
BUSY message. CO
NNE
CT
XXXX
message reflectin
g
bit rate when
a
conne
cti
on is established
.
ATXl
ATX3
ATXl
ATX
4
Negotintioo Progress Reporting. An additional set ofresult codes ca
n
b
e
enabl
d
·
h
W
. .
e
w11
the
command to repo
rt progress of th
e
negonan
on
phase of
error-correction
m
d
T
l
code
s
repo
rt
the carrie
r
speed
(300
bp
s
- 1.4
400
bps)
a
nd th
e
error-correcti'o
o
e
.
ies
e
T
h
.
.
.
n
protoco
l
ese messages can als
o b
e
reporte
d
m either numeric or verbose form.
For
exa
1
.
b
·
77 and PROTOCOL:LAP-M indicate that the error correction
protoco
l
i
s
LAP
�
�
e
,
(th
also the A TXn a
nd S95
commands.
)
·
ee
If
the error-correction
link.
is negotiated a
nd a connection i
s
made,
the
appro
ria
t
CONNE
CT
XXXX
messag
e
t
s
reported
.
P
e
When in error-correction mode, the CARRIER
XXXX
message
may
indicate
o
n
d
whilst the CO
NNE
CT
XXXX
message repo
rts
another.
e sp
ec
·
Parameters
:
0 - 2
Default:
0
Result Codes
:
O
K
ERRO
R
ATWO
A
T\V
l
ATW2
Comman
d
Options:
Extende
d
Result Codes. Determines whether the Executive Serie
s
respond
s
t
o
dialton
e
a
nd bu
sy signals, a
nd how
it displays result codes for CONNE
CT
messages
.
Whe
n
th
e
modem ignores dialtone, it wai
ts for a time delay given by registe
r
S
G
(default is
2
seconds)
and then dial
s
regardle
ss
o
f
presenc
e
or absence of dial tone; this is called blin
d
dialling.
Parameters
:
0 - 4
D
efautt:
4
Result Codes
:
O
K
ERRO
R
ATX
O
Command
Options:
ATW
n
ATX
n
COMMAND
Page 19
3
4
DES
CRIPTION
Table 3-3. AT & Command Defin
ition
s
otherwise
Dial-
up
line
.
Leased line.
Disables flow contro
l.
Enables RTS/CTS flow contro
l.
Enables XON/XOFF flow contro
l.
Enable
s
transparen
t
XON/XO
FF flow contro
l.
forO and
l.
for 0, 3,
4
O
T
5.
otherwise.
fo
r O an
d
l.
othe
rwise
.
Suitable for
RJ-11, RJ-4
IS or RJ-45
S
type p
hon
e
jack.
Th
e
a
uxili
ary rela
y
is neve
r
operated
.
Suitable for
RJ
·
12 or RJ-13 type jack.
otherwise.
3
9o/o/61%makelbrc
ak
ratio
@
.10 pps
.
33%/67% make/bre
ak
ratio
@
10 pps.
33o/o/67% make/bre
ak ratio @ 2
0
pp
s
for n = 0 • 2 in US.; for
n = 1 • 2 in Japan.
AT&Jl
n
=
O
,
l
0
O
K
ERRO
R
AT&JO
n = 0, 1 or
2
l
O
K
ERRO
R
AT&PO
AT&Pl
AT&Pl
Command
Options:
Dial Pulse Ratio. Selects the ratio of the off-hook (make) to on-hook (break) interval used
whe
n
pulse
dialling
.
Parameters:
Default:
Result Codes:
Comman
d
Options
:
Command
Options:
Lin
e
Type
.
Controls selecti
on of leased line or dial-up line. Although the Executive
Series modem ha
s
only a singl
e
line connection, th
e
powe
r
level is changed when setting
leased tin
e
operation.
(See
$91
register.
)
Parameters
:
n = 0 or
1
Default:
0
Result Code
s:
O
K
ERRO
R
AT&LO
AT&Ll
Table 3-3. AT& Command Definitions (Cont'd
)
Communication Mode. Sam
e as AT&QO • AT&Q3.
Parameters:
n
=
0 • 3
Default:
&Qn
Result Codes
:
O
K
for O • 3
.
ERRO
R otherwise.
3
5
DES
CRIPTION
DTE/Modem Flow Contro
l.
Determine
s
how the Executive Series controls the flow of
data between the loc
al DTE and the modem. When the modem'
s
termina
l
buffer is
nearly
full,
it w
ill either send an XO
FF or
drop
CTS to stop the data flow. Whe
n
th
e
b
uffer is
nearl
y
empty
,
the modem wi
ll either send
an
XON or raise CTS to start the data flow
again
.
The Executive Series als
o
responds
to XON/XO
FF characters or RTS stimulus from th
e
D
TE
by suspending
o
r
resumin
g
transmission accordingly. The modem responds to DTE
XON/XO
FF characters and also
passes
the XON/XO
FF characters to the remote mode
m
a
s
data
if
transparen
t
flow control i
s selected
.
When in Direct mod
e
(AT
&QO),
flow control is not used and
th
e
modem ignores the
setting
of this command
.
Parameters
:
n = 0, 3,
4
o
r
5
Default
:
3
Resu
lt Codes:
O
K
ERRO
R
AT&KO
AT&
KJ
AT&K4
AT&
KS
Command Options
:
Telephon
e
Jack Selection. Determines how the a
uxiliary relay is controlled. This
command is not
implemented
,
however the command structure is provided for
applicati
on
compatibility.
Parameters
:
Default:
Result Codes:
AT&Ln
AT&Pn
AT&Mo
AT&Jn
AT&Kn
COMMAND
otherwise
.
RLSD is ON regardless of the state of the
data
carrier from the remote mode
m
RLSD follows the state of the
dat
a
carrie
r
from
the remote modem.
fo
r O an
d
l.
AT&Cl
DCD Option. Controls the Received Line Sig
nal Detecte
d
(RLSD) [Carrier Detec
t
(DCD
signal of the senal port
.
If
synchronous mode
i
s
selected,
thi
s
command
i
s
i
gn
d
d
)
]
E
· S ·
o
·
·
I
-
an
�
xecunv
e
ene
s
tuncuon
s
a
s
if
the AT &Cl comman
d has bee
n
entered
.
Parameters
:
n
=
0
,
I
Default:
0
Result Codes
:
O
K
ERRO
R
Comman
d
Options:
AT &CO
DTR Option. Detenn.ines actions taken by the Executive Seri
es in relation t
o
the
Dat
a
Tenn.inal Ready (DTR) signal of the seri
al port. Th
e effect of DTR lo
ss
depend
s
upon
the
AT&D and AT&
Q
(AT&M
)
commands.
Parameters:
n
=
0 • 3
Default:
0
Result Codes:
O
K
fo
r O t
o
3
.
ERRO
R othe
rwise
.
Tlie action for the even
t that follows DTR loss is indicated in th
e
followi
ng
table
:
&DO
&Dl
&D2
&D3
&QO
NO
NE
2
3
4
&QI
I
2
3 4
&Q2
3 3 3 3
&QJ
3 3 3
3
&Q4
I
2
3 4
The DTR going-off events
correspondi
ng
to the action numbers in the table above are:
1. Modem disconnects and sends OK resu
lt code
.
2. Modem goes into comma
nd mode
if
i
n
da
ta
mode and sends OK result code.
3. Modem disconnects after the dela
y
specified
i
n
register S38,
sends the OK
result code, and disables auto answer while D
TR is off
.
4. Modems\ performs a warm start (i.e., sam
e as ATZ
command).
This is the
DTE/AT&D3 abort
.
Restore Factory Configuration. Loads the Executive Series' activ
e
confi
guratio
n
area
with th
e
factory
default values.
Parameters:
None.
Default
:
None.
Result Codes
:
O
K
Set Guard Tone. Normally controls th
e
generation
o
f
guard
tones. This command is not
implemented
,
however th
e com
mand s
tructure i
s
provided
fo
r
application compatibility
.
Parameters:
n
=
0 • 2
Default
:
0
Result Cot/es:
O
K
for Oto 2.
ERRO
R otherwise
.
AT&Cn
AT&
F
AT&bn
AT&Gn
COMMAN
D
Page 20
3
7
DES
CRIPTION
Table 3-3. AT& Command Defin
itions
(Cont'd
)
CTS i
s
fo
r O an
d
1.
othe
rwise
.
DSR is always ON
.
DSR is turned ON at start of handshaking and OFF
when i
n a test mode or idle state. DSR is turned OFF
when ca
rrier is lost.
otherwise
.
CTS tracks RTS. CTS is turned ON in
res
pon
se
t
o
an OFF-to-ON transition ofRTS from the l
ocal D
TE
after a delay period specified by register S
26 in
increments o
f
1
0
milliseconds
(defau
lt
i
s
0).
The mode
m
ignores
RTS. CTS is held ON
.
AT&TS
AT&T4
AT&T3
AT&
Tl
AT&Rl
ERRO
R
AT&SO
AT&Sl
Command
Options
:
RTS/CTS
Option.
Controls the state of the CTS signal in the synchronous mode.
always
ON
in
the a
synchronous mode
.
Parameters:
n
=
0, 1
Default
:
0
Resu
lt Codes:
O
K
ERRO
R
AT&RO
DSR
Option.
Determines whether DSR operates in accordance with EIA-232-D
specificatio
n
o
r remains ON
.
Parameters
:
n
=
0, 1
Default
:
0
Result Codes
:
O
K
fo
r O and
I.
Comman
d
Options:
Tes
t
An
d
Dia
gnostic.
Selects the test command. Test commands must be initiated in th
e
command mode wit
h
asynchronous operation
in the Direct mode selected (AT&QO) a
t
a
spee
d
o
f
1200
bps
or faster.
A
telephone
line c
onnecti
on must
be establishe
d prior to
initiating digital loopbac
k
tests
.
If
these conditions a
re not met, the Executive Series issue
s
the ERROR result code.
If
l
ocal analogue l
oopback is initiated while
th
e
modem i
s
connected, it will disconnect before performing the tes
t.
Parameters
:
0, 1, 3 - 8
Default
:
4
Comman
d
Options:
AT&1;
0
End test in
progress
.
The esca
pe sequence mu
st
be
issued to return the Executive Series to the command
mode
prior
t
o
sendin
g
this command.
Subsequen
t
issuin
g
of the A TO command w
hile in the command
mode will cause the l
ocal and remote mode
ms to
return to norm
al da
ta mode operati
on if th
e
interrupted
test was digital loopback.
Initiates local
analogue loopback. This test ve
rifies
th
e
workin
g
conditio
n of the path between the local
D
TE and the loc
al modem. The characters received
from the DTE are
loope
d
back to the D
TE by the
modem.
Initiates remot
e
digit
al
l
oopbac
k
locally. The
characters received fro
m the remote modem are
looped
back to the remote mode
rn
b
y
the local
modem. This test ve
rifi
es th
e
worki
ng
condition o
f
the
path
from a remote modem, through a local
modem, and back to the remote modem
.
Allows the Executive Series to respond to a reque
st
from a remote modem for a remote digital lo
opbac
k
test
.
Prohibits the modem from
g
ranting
a requ
est from a
remote modem for a remote digita
l loopback test.
AT&Sn
AT&Tn
AT&Rn
.
COMMAND
3
6
DESCRIPTI
ON
Communication Mode. The Executive Serie
s
sup
rts
thr
b
·
po
ee asi
c
comm
unicatio
n
modes:
asynchronous,
synchronous
,
and error correction
.
Parameters:
n
=
0 • 6
Default:
5
Result Codes
:
OK fo
r
O - 6
ERROR otherwise.
Command Options:
AT &QO Selects asynchronous
operation
in the
Direc
t
Mode.
D
TE speed must match th
e
telephon
e
line
speed.
AT &
Q 1 Selects synchronous mode
1
operation
.
Supports terminal
s
that are able to communicate in both
asynchronous and
synchronous protocols. Uses the di
al command to
place
a
call
i
n
a
synchronous
mode then switches to
synchr
onous
mod
e
once
th
e
conn:cbo
n
ts made. The modem goes on-
hook an
d
switches
back't
o
a
synchronous mode when it detects an
ON-to-O
FF
transition on DTR or a loss of c
arrier from th
e
remot
e
mode
m
exc
eeding the time interval given
by register
SlO
.
AT &Q2 Select
s synchro
nous mode 2
operation
.
S
upports
synchronou
s
terminals wi
th stored number
dialling
.
The modem
automatically dials a store
d number when it detects an
OFF-to
-
ON transition on DT
R.
An
asynchronous terminal i
s still
needed to save or change the phone number stored in the
NVRAM
;
the number is saved usi
ng the "AT&ZO=x
"
command. The modem dials the number stored in the first
entry. The modem
goes
on-hook and switches back t
o
th
e
asynchronous mode when an ON-to-O
FF transition on DTR
i
s
detected or a loss of carrier
occurs from the remote modem
exceeding the time interva
l
given by registe
r
SlO.
AT&Q3 Selects synchronous mode 3
operation.
This mode allows
D
TR to act as a Talk/Data switch. Th
e
operato
r
manuall
y
initiates
a
c
all
with DTR OFF, implying the modem is in Tal
k
mode. T
o
complet
e
the
call
,
th
e
operator
switches the modem t
o
Data mode by
turning
D
TR
ON
after the last number is dialled.
The modem goes on-hook and switches to the
asynchronou
s
mode when
an ON-to-O
FF transition on DTR is detecte
d or a
loss of carrier occurs from the remote mode
m
exceedin
g
th
e
time interv
al
given by registe
r
SlO
.
AT &Q4 This command causes the Executive Series to issue OK result
code but has no effect o
n operation.
AT&QS Selects error correcti
on mode. Mode
m
negotiates
an erro
r-
correction link. The modem can
be
configured
to either
disconnect or fallback to a norma
l
a
synchr
onous
connect
i
f
a
li
nk cannot b
e
negotiated
(refer
register
S36)
.
AT&QS and S3
6 = 0: same as A
T\N
2
(nofallback).
AT &Q5 and S36 = 1: same a
s
A
T\N
J
(fallback) (s
ee
A
T\N command).
AT &Q6 Selects
asynchronous operatio
n
in Normal mode
(Constan
t
Speed
Interface). In this mode, D
TE
speed
can differ fro
m
telephon
e
line
speed.
AT &Q7 This command causes the modem to issue the OK result code,
but has not effect o
n
operation.
AT &Q8 This comma
nd forces the modem t
o behave as if S48=128,
i.e.,
fallback to
MNP
.
If
B
it I of S36=1, the modem acts as i
f
S36=7.
Otherwise
,
it acts as
if S36=5.
AT&Q9 This command causes the modem to behave as if AT&QS was
set with
848=7 and S46=138. The modem w
ilt
attemp
t
V.42
bis
,
fallback to V.42 (LAP-
M) then fallback to normal mode.·
Table 3-3. AT& Command Defin
ition
s
(Cont'd
)
AT&Qn
COMMA
ND
Page 21
AT&
V
Table 3-3. AT& Comma
nd Definitions
(Cont'd
)
STORED PROFlLE 0
:
Bl El L2 Ml NI
P
QO
VJ WO X4 YO &CO &DO &00 &JO &
K:3
&Q5
&RO &SO &T4 &XO
800:
000
802·.
043 806:002 807:030 808:002
809:0
06 810 014 SI 1:0
95 812:050 S!S:000
S2l:00l S26:00t
836:005 S37:
000 838:020 844:003 $46:138 848:007 549:008 Sl0:2
55
for al
l
parameters
.
if
sto
ra e number n is outsid
e allowable ran e.
fo
r O and
l.
otherwise
.
Selects user
profile
0
.
Selects user
pro
fil
e
1.
Interna
l
timing
.
The modem generates the
transmit clock
signal
and applies it to the
EIATXCL
K
outpu
t
at the seri
al interface
.
Externa
l
timing.
The loc
al DTE sources the
transmit cloc
k
signal
on the SPXE
XT CLK inpu
t
of the serial interface. The modem applies
thi
s
clock to the EIA TXCLK output at the seri
al
interface.
Slave receiv
e
timing
.
The modem derives th
e
transmit clock
sign
al
from the incoming carrier
a
nd
applies
it
to the EIATXCLK output at tho
seri
al interface
.
for Oto
2
.
otherwise
.
otherwise.
Save as user profil
e
O
.
Save as user profil
e
J
.
for O an
d
1.
AT&
X2
AT&Xl
Command
Options
:
Store Phone Number. Stores
a
36-dig
it
dial
s
trin
g
oo
in the specified en
try (n) for later
dialling
.
(See
ATDS=n conunand.)
Parameters
:
n = 0 • 3, x = dial s
tring
Default:
None.
Result Codes:
O
K
ERR
OR
Designat
e
Default User Pro
file.
Designate
s
whic
h o
f
tw
o
user profil
es
w
ill
be loaded int
o
the active
configurati
on
a
t
power up.
The user
profil
e
is denoted
by
the parameter value.
Parameters:
0, l
Default:
0
Result Codes:
O
K
ERROR
AT&YO
AT&Yl
Command
Options:
Clock
Source Selection. Selects the source of the synchronous transmit clock for th
e
Executive Series
d
uring synchronou
s
operation.
I
n
a
synchronou
s
mode,
the transmit and receive clocks arc t
urned OFF. In synchronous
mode
th
e
clocks are turned
ON wi
th the
frequency
o
f
240
0
Hz or
12
00
Hz
corres
pondin
g
to the'
spee
d
that is selected for modem operation.
Parameters:
n
=
0 - 2
Default
:
0
Result Codes
:
O
K
ERRO
R
AT&XO
Store User Profile. Saves the current configuration into NVRAM
as one of two use
r
profiles.
The curren
t
configuration
is comprised of a list of storable parameters
illustrate
d
i
n
the AT & V corrunand. These
setting
s
are restored to the activ
e
configuration
upo n
receivin
g
an ATZn comma
nd or a
t
power u
p
(see AT&Y command). The user
profil
e
saved is denote
d
by
th
e
parameter
value
.
Parameters:
n
=
0,
I
Default:
0
Res11/t Codes
:
O
K
ERRO
R
Command
Options:
AT&WO
AT&Wl
Table 3-3. AT
& Command Definitions (Cont'd)
DES
CRIPTIO
N
3
9
AT&Yn
AT&Zn
AT&X
n
AT&Wn
·
COMMAND
t
=
4
•
3
8
Initiates remote digita
l loopbac
k. Th
e
characters
receive
d
from the local DTE arc transmitted to the
remot
e
mode
m
a
nd loope
d back from the remote modem to
the
loca
l
mode
rn
a
nd DTE. This test verifies th
e
workin
g
condition
of the pa
th between the local DTE and the remote
modem
.
Initiates remote digita
l
loopback
with self test.
Thi
s
tes
t
wor
ks similarly to AT &T6 except that th
e
Executiv
e
Series
sends an alt
ernating zeros a
nd ones
(0101)
tes
t
pattern
t
o
the remote modem an
d
continuously
examines the
validi
ty
of the returned data. The modem increments
an
internal
error counter each time an error is detected. A
t
the
e
nd
o
f
the test, the Executive Series returns
a
3-digi
t
erro
r
COWJ
t
t
o
the DTE.
Initiat
es local analogu
e
loopbac
k
with se
lf test.
This
tes
t
works similarly to AT&T7 except that the test
pattern
i
s
checked in the local analogue
loopback
mod
e
(as
i
n
AT&Tl). This allows a
thorough
testing
of the loca
l
modem transmit and receive functions without
an
actual
telephon
e
line connection.
DESCRIPTION
AT&T7
AT&T6
AT&TS
OK
View Current Configuration And User Pro
files. Displays th
e active
confi
gurati
on
an
d
use
r
profiles
.
Parameters
:
None.
Default
:
None.
Result Codes
:
O
K
Example:
ACTIVE PROFILE
:
BO
E
t
L2 M
l
NIP
QO
V
I
WO X4 YO &CO &DO &GO &JO &
K3 &Ql &RO &SO &T4 &XO &YO
S00:
000 SOI :
000 S02:043 803:013 S04:0IO
805:00
8 806:002 807:030 SOS:002 509:006
810:014 811:09l 812:0lO 818:000 825:005 826:001836:
005837:
000 S38:020 844:003
846: 138
848:007 849:008
ssocss
STORED PROFI
LE
I
:
DI
E
l
L2 Ml
N
I
P
QO
VI WO X4 YO &
CO &DO &GO &JO &K3
&Q5
&RO &SO &T
4
&X
O
800:000
802:0
43 806:002 807:030 S0&:002 S09:006 S!0:014 SI 1:095 SJ2:0l0 Sl8:0
00
S2l:005 826:001
836:00l 837:00
0 838:020 844:00
3 846:138 848:007 849:008 Sl0:2l
l
TELEPHONE NUMBERS
:
O
=
2
•
AT&Tn
(cont'd
)
AT&
V
COMMAND
Page 22
DESCRIPTIO
N
Table 3-4. AT\ Command Definition
s
Modem-To-Modem Flow Contro
l. Enables or disables modem-to-modem flow
control
durin
g a Norm
al mode connection. Since the reliable link (erro
r
correction)
has
its
own
met
hod of flow control, the A liGn command is ignored when error corre
cti
on is
selected
(AT&QS). However, the DTE-to-modem flow control remains activ
e
during
a
reliable
li
nk ..
Selects Normal
(speed
buffering) mode. Thi
s
option
take
s
effect at
physical
c
onnection
time.
Selects Direct
(pa
ss through)
mode.
This
optio
n
takes effect a
t
physical
connection time.
Selects reliable link mode. This defines th
e
modem-to-modem connection to require erro
r
correction.
If
an
attempt
to establish the reliable
link fails, the modem disconnects. This
command takes effect at
physica
l
connection tim
e
only.
To establis
h
lvlNP
after a physical
connection, use the AT\0, AT\U, or AT\Y
command.
Selects auto-reliable link mode. The mode
m
wil
l
attemp
t
an error-correcti
on connection but
wi
ll
fallback to Normal mode
if
unable to
establish
an
MNP
link. This command take
s
effect at
physica
l
c
onnection time only. T
o
establish MNP
after
a
physical
connecti
on, us
e
theAT\0
,
AliU, or AT\Y command.
(lfn
i
s
greater
th
an
3
,
3
is used.
)
Uses Stream mode fo
r
MNP
link connections
Uses Block mode fo
r
MNP
link connections.
(
If
n is
greater
th
an
I, I
is used.
)
Modem sends a BRE
AK to
the
remote mode
m
and enters command mod
e
(waitin
g
fo
r
Al).
Modem sends a BREAK to remote
modern
.
Modem does not clear b
uffers but sends a
BREAK to the loc
al DTE
.
4 l.
A
T\N
l
A
T\N
3
AT\N
2
n
=O -
3
3
O
K
A
T\N
O
n
=
0,
l
0
O
K
A
T\L
O
A
T\L
l
A
T\Kl,3,5
A
T\K0,2,
4
AT\K2
,
3
Parameters
:
Default
:
Resul
t
Codes
:
Comman
d
Options:
Operation
Mode Control. Selects th
e
operati
ng
mode the modem uses while connected
(see AT&Qn).
A
l\K4,
5
Modem sends a BREAK in sequence with
any
data being b
uffered
.
When a BRE
AK is received from the D
TE
duri
ng
Direct mode, the Executive Series take
s
the following action:
Table 3-4. AT\ Comma
nd Definition
s
(Cont'd
)
Note: In
LAP-M
,
bre
aks ar
e
"timed"
,
meanin
g
the Executive Serie
s
attempts
t
o
preserve
the duration of the break when
transmitting
it to the remote modem
.
In
MNP4,
breaks ar
e
not
"timed",
a
s
MNP
4
h
as no
facilit
y
for maintaining the duration of the signa
l; a lon
g
bre
ak
i
s
the same as a sho
rt break.
M
NP
Block
Transfer Control Determines whether the mode
m
will
use Block or Stream
mode for MNP link
.
DESCRIPTION
Parameters
:
Default
:
Result
Codes:
Command
Options:
When a BREAK is received from the remote modem durin
g
Norm
al
mode, the Executiv
e
Series takes the following action
:
A
T\KO,
1
Modem clears the terminal and modem buffer
s
and sends a BREAK to the local DTE
.
A
1\N
n
AT\Ln
AT\Kn
(cont'd
)
COMMAND
Sets m
aximum block size to
6
4
characters
Sets maximum block si
ze to 12
8
characte;s.
Sets
m
aximu
m
block size to 19
2
characters
.
Sets maximum block size to
25
6
characters
.
(J
f
n is
greater
th
an
1
,
I
i
s
used.
)
Disables flow contro
l
(XONIXOFF)
.
Enabl
es flow control
(XONIXOFF)
.
Modem sends a BREAK to the remote modem i
n
sequence with any transmitte
d data
.
4
0
A
'I\A
l
A
1\A2
A
l\A
J
3
O
K
if
connected.
NO CARRIE
R.
if
no
t
connected,
n
=
0, I
0
O
K
A
'I\GO
AliG
l
A
T\KS
Maximum MNP Block Size. Sets maximum block size for
MNP
str
eam
link
c
11
·
.
.
onn
ec ons.
Use this comma
nd to transrrut smaller blocks of data in a reliable link
connection.
Parameters
:
n
=O -
3
(lfn is
greaterthan
3
,
3
i
s
used.)
Default
:
3
Result Codes:
O
K
Comman
d
Options:
A
1\A
O
Default:
Result Codes
:
Parameters
:
Default
:
Result Codes
:
Comman
d
Options:
Break Contro
l. Dete
rmines what the Executive Series will do when a BREAK is received
from the
D
TE
or the remote modem
.
During
MNP
mode
,
the remote modem's BRE
AK
control setting
determine
s
how the local modem will
handl
e
the BREAK
.
Parameters:
n
=
0 - 5
(
If
n is
greater
than
5
,
5 is
used.)
DefaufJ:
5
Result Codes:
O
K
Command Options:
When a BREAK is received from the D
TE
d
urin
g
Normal or
MNP
mode, the Executive Series takes th
e
followin
g
action:
A
T\KO,
2, 4 Modem enters the command mod
e
(waiting
fo
r
A
T) wit
hou
t
sendin
g
a BRE
AK to the remote
modem.
A
T\K
l
Modem clears the termin
al and modem b
uffer
s
and sends a BREAK to the remote modem
.
A
1\KJ
Modem does not clear the buffers but sends a
BRE
AK to the remote modem.
Tr
ansmi
t
Break. When this command is entered
d
uring
a non-
MNP
connection
t
h
. Executive Seri
es sends a break sign
al to the remote modem. The
length
of the
bre
ak
i
s
I�
times the n parameter value in millisec
onds.
If this command is entered in
MNP
mode
th
e
Executive Series sen
ds a Li
nk Attention PDU to the remote modem
.
'
Parameters
:
n
=
I
t
o
9
(
If
n
=
0,
the default value 3 i
s
used;
if n
i
s
greater than 9, 9 i
s
used.
)
A1\B
n
A
'l\A
n
A1\G
n
A
1\K
n
COMMAN
D
Page 23
DESCRIPTIO
N
Table 3-4. AT\ Command Definition
s
(Cont'd
)
Selects the one/two-way compression
Two-way
compression.
Compressi
on
disabled.
Transmi
t
compressi
on
only
.
Receiv
e
compression
only
.
Disables auto-retrain
.
Enabl
es auto-retrain
.
512
.
1024
.
2
048
.
4
096
(one-way compression
only). •
Disables data compression.
Enables data compression.
AT%M2
AT"/oM3
AT%EO
AT%El
AT%CO
AT%Cl
AT%DO
AT%Dl
AT%D2
AT%D3
DES
CRIPTION
Determines whether or not the mode
m
will
use data
compression
.
0,
I
(Ifnisgreaterth
an
I, I
i
s
used.
)
1
O
K
Set
One/Two-Way
Compression
Mode (BTLZ).
mode whe
n
using
B
TLZ
compression
.
Parameters
:
0 - 3
Default:
3
Comman
d
Options:
AT%MO
AT%Ml
Command
Options:
Command
Options:
Enabl
e/Disable Auto-Retrain. Dete
rmines whether or not the Executive Seri
es
automaticall
y
monitors the lin
e
q
uality
an
d
requests
a re
train whe
n necessary during
a
2400
bp
s
or
f
aster connection
.
Parameters
:
n
=
0,
1
(
If
n is greater th
an
l, 1
i
s
used.)
Default:
0
Result Codes:
O
K
04
3
=
Received level o
f
-4
3
dBm.
If
th
e
received level is
greater
than
-
9
dlsm
,
0
09 will be
reported
.
If the received level is
less tha
n
-43
dBm,
043 will
be reported
.
Parameters
:
None.
Default:
None.
Result Codes
:
O
K
4
3
Repo
rt
Received
Signa
l
Level. Returns a value identifying the received si
gnal
leve
l.
The
possibl
e
values are:
009
=
Received level o
f
-
9
dBm.
0
10
=
Receiv
ed level o
f
-10
dBm.
01
1
,d
Received level o
f
-11
dBm.
• Fo
r
two-wa
y
compression
(AT%M3)
,
the dictionary si
ze is set t
o
204
8
if AT%D3 i
s
issued.
Table 3-5. AT% Command Descriptions
Set
Dictionary
Size (BTLZ). Sets th
e
BTLZ
dictiona
ry size.
Parameters:
0 - 3
Default:
2
Result Codes:
O
K
Compressi
on
Control.
Parameters
:
Default
:
Result Codes:
Comman
d
Options:
AT%En
AT%Mn
AT%
L
AT%Cn
AT%Dn
COMMA
ND
�
=
-.ri·•
(
If n is greater than
42, 42
i
s
used.
)
4
2
None.
None.
None.
Non
e
None.
None.
None.
None.
Parameters
:
Default:
mode and in direct mode.
Parameters:
n
=
0 - 42
Default:
0
Result Codes:
O
K
Parameters
:
Default
:
A
ccept Reliable Mode Control. Causes the Executive Series to wai
t
u
p
to 12 sec
ond
s
fo
r
a
li
nk request from the remote modem to establish
an
MNP
link,
regardless
of whether the
modem is i
n originate or answer mode.
If the Li
nk Request is not received within this tim
e
peri
od,
the modem returns to it
s
previous
state
.
This co
mmand c
an be ex
ecute
d
onl
y
if
a
physic
al
connection exists, and w
ill return th
e
N
O
C
ARRIER message if there is
no connection, or a
n
appropriat
e
connect
messag
e
if
a
reliable link connection already exists. This command mu
st be the last command on
a
command line.
Switch To Reliable Mode. Causes the Executive Series t
o
try
to establish a reliable link.
Depending
on whether it is
in
originat
e
or a
nswer mode, the modem eithe
r
accepts
a link
request from the remote modem or sends a li
nk
request, respectively.
If the
MNP
connection
attemp
t
fails, the Executive Seri
es returns to it
s
previo
us
state.
This comman
d
c
an
b
e executed only if a physic
al connection exists, and will return the N
O
C
ARRIE
R
message
if there is no connection, or
an
appropriate
connec
t
message
if
a
reliabl
e
li
nk
connectio
n
already
exists. This command must be the last command on
a
command line
.
Inactivity Timer Control. Dete
rmines the length in
I
-minute
intervals that the
Executive
Seri
es
wi
ll
wait before disconnecti
ng when no data is sen
t
o
r
received. In
MNP
mode,
any
data transmitted or received by the modem w
ill reset the timer
.
In
non-
MNP
mode
,
any
data transmitted w
HI reset the timer. The inactivity timer is
inoperativ
e
i
n
synchronous
Originate Reliable Link Contro
l. Forces the Executive Seri
es
t
o
originat
e
a
n
MNP
connection regardless of whether it is
in
originate or answer mode. Th
e
modem
wi
ll
sen
d
up to two
li
nk
requests
.
I
f
the remote modem does no
t
res
pond
after the secon
d
reques
t
the
Executive Series retu
rns to its
previous
state
.
'
This comman
d
can
b
e executed only if a physical connection
exists
,
and will
retu
rn
a
N
O
C
ARJUER message if there is no c
onnection, or
an
appropriate
connect
message
if
a
reliable link connecti
on already exists. This command must be the las
t
comman
d
on a
command line
.
Switch To Normal Mode. Causes the Executive Series to switch to normal mode after a
reliable
li
nk
i
s
established.
Switching
th
e
normal mode
erases
a
ny
data that
may
be in the
termin
al and modem buffers.
This command can be execute
d
onl
y
if
an MNP connection exists, and
w
ill
retu
rn the N
O
C
ARRIE
R
messag
e
i
f
there is
no connection, or an
appropriate
connect message
if
a
reliable link connection previously existed.
This comma
nd must be the last command on a conunand line.
Parameters:
Default:
Parameters:
Default
:
AT\
U
AT\O
A
T\Z
AT\Y
AT\T
n
COMMA
ND
Page 24
Table 3-5. AT% Comma
nd
Description
s
(Cont'd
)
COMMAN
D
DESCRIPTION
Clear BTLZ Encoder Dictionary. Resets the local modem B
TLZ encod
er
dictionary
a
nd
AT%
P
sends a command
code to the remote modem to reset the remote B
TLZ
diction
ary
Parameters: ·
None.
·
Default
:
None.
Result Codes:
O
K
if
encoder
dictionary
is in use
.
ERRO
R
if
encoder
dictionary
is not in use.
Repo
rt Linc Signal Quality. Returns the high-orde
r
byte
of the calculate
d
Eye
Quality
AT%
Q
Monitor (EQ
M) value. The high-order byte can
rang
e
from O to 255
.
However
,
whe
n
the
value is 8 or greater, the Ex
ecutive Series wi
ll
automatically
retrain
if
enabl
ed
by
the
AT%El comman
d. The value for a normal connection
ranges
from about
o
t
o 2 and
approaches
8 for
a
progr
essively poore
r
connection.
Parameters
:
None.
Default
:
None.
Result Codes:
O
K
Set Maximu
m
String Length
(BTLZ).
Se
ts the maximum number of characters that ca
n
AT%Sn
be
compressed
into one word
.
Parameters:
6 -250
Default
:
32 characters.
4
4
4. S REGISTER
S
The
S
register
s
are summaris
ed in Table 4-1
al
ong
with their default values.
Registers
denoted
with an"*" in Table 4-
1
may
be store
d
in
one of the two user profiles
by enterin
g
th
e
AT&Wn
command. One of these
profiles ma
y
be loaded at
any
time
by
using
the ATZ
n
command
.
The
S
registers
are describ
ed in detail
in
Table
4-2
.
4.1
Factory
Defaults
The
factory
default values are stored in the EPROM and are loaded in
to th
e activ
e
configurati
on
a
t
power-u
p
o
r
by
the A TZn command. In addition, the designat
ed defaul
t
profile
i
s
subsequentl
y
loaded, an
d
may chang
e
some of the facto
ry default values. The
designat
ed
defaul
t
profile
c
an be
chang
ed
by
the AT&Yn comma
nd where n can be one o
f
two
possible
use
r
profiles
(
0
o
r
l ).
All of th
e
original factory
default
registe
r
value
s
may
be loaded at
any·
time whilst i
n
command mod
e
by entering
the AT &F command.
4
.2 S Register Determinati
on
Throughou
t
this manu
al the values for
S
register
s
are liste
d
in
decimal notation. To
determine the conten
ts of some
S
registers
,
it is neces
saryto conve
rt from deci
mal to binary or
vice versa. To convert an
S
Registe
r
to it
s
binary representation
,
see the Decimal-To-Binary
Conversion Table at the rear of this manual.
4
5
Page 25
4
6
4
7
REGISTER
DES
CRIPTION
Numbe
r
O
f
Rings
T
ill Auto-Answer.
Establishes the number of ri
ng signals req
uired
s
o
before
the Executive Series
answers incoming calls.
Setting
thi
s
register
to zero (0) disable
s
auto-answer mode
.
If
S
O
is set to
1
,
the modem will answer
after 2 rings;
if
set to a value
greate
r
than 5, 5 is used.
Range:
0, 2
- 5 ring
s
Default:
0
Ring
Counter
.
Number
o
f
ring
s
that the Executive Series detects before it answers a call.
If
S
l
n
o
ring
s
oc
cur
over
an
eigh
t
second interval, this register is cleared.
Range:
0. 25
5
ring
s
Default:
0
Escape
Character
.
S
2
holds
the decimal
value of the ASCII character used for the esca
pe
S
2
c
haracter.
The default value corresponds to an ASCII
'+'
.
A value over 127 disables th
e
esca
pe
process
,
i.e.,
no escape character
will
be reco
gnised.
Range:
0
•
2
55,
ASCII decima
l
Default:
4
3
Carriage
Return Character.
Set
s
the
command
line and result code terminator character
.
S
3
Pertains to
a
synchronou
s
operation only
.
Range:
0 • 127, AS
CII decim
al
Default:
13
(Ca
rriag
e
Return
)
Line Fee
d
Character.
Set
s
the character
recognise
d
as a line feed. Pertains to
S 4
a
synchronou
s
operation
only
.
The Line Feed control character is output after the Carriag
e
Retu
rn
control c
haracter
if
verbose result codes are used
.
Range:
0
-
12
7,
ASC
II decima
l
Default:
1
0
(Lin
e
Feed)
Backspa
ce
Character
.
Sets th
e
character reco
gnised as
a
backspace
.
Pertains t
o
S
S
a
synchrono
us
operati
on
only
.
The Executiv
e
Series will not reco
gnise the Backspac
e
c
haracter
i
f
it i
s set
t
o
a value
that i
t
greate
r
than 32 ASCII. This character can
be
used t
o
edit
a
command
line
.
Whe
n
the echo command is enabled, the modem echoes back to the
local
D
TE
th
e
Backspac
e
character
,
an
ASCII space character and a sec
ond Backspace
character;
this
means
a to
tal
of thre
e characters are transmitted each time the Executive
Series
processes
the Backspac
e characte
r.
Range:
O
-
3
2,
ASC
II decimal
Default
:
8
(Backspace
)
Wait Time For Bli
nd Dialling
.
Set
s
the
len
gth
of time t
o
pause
after the Executive Series
S 6
goe
s
off-hoo
k
an
d before
it dials
the firs
t
digi
t
of the telephone number. The modem always
pause
s
fo
r
a
minimu
m
of 2
seconds even
if
the S6 register is set to a value less th
an
2
seconds
.
Th
e
"Wait
Fo
r
Dialtone
"
ca
ll
progress
feature (W in the dial string
)
"�11
override
the
value
i
n
registe
r
S
6.
If
option
A TX2 or A TX4 is in effect,
this register is ignored
.
Range:
2 - 25 5 second
s
Default:
2
Table 4-
1. S Registe
r
Summa
ry
*
Registe
r
value
may
be stored m one of two user profiles wi
th the AT &Wn command
.
REGISTE
R
TIT
LE
DEFAULT
s o
Number Of Rines T
ill Auto-Answer
0
*
S
l
Ri
ng Counte
r
0
S
2
Escane Characte
r
4
3
*
S
3
Carriaze Return Characte
r
13
S
4
Line Feed Character
1
0
S
5
Backspace Character
8
S
6
Wait For Blind Dialling
2
*
S
7
Wait For Ca
rrier
After Di
al
5
0
*
S
S
Pause Time For Dial Dela
y
2
*
S
9
C
arrier Detect Resoonse Time
6
*
SlO
Lost C
arrier To Han
11:-Uo Delav
1
4
*
Sl 1
D
TMF Tone Durati
on
9
5
*
S12
Escaoe Code Guard Tim
e
5
0
*
S
l3
Reserved
None
Sl4
Bit-Manned Ootion
s
None
*
Sl5
Reserved
Non
e
Sl6
Bit-Manned Test Option
s
Non
e
Sl7
Reserved
None
Sl8
Test Timer
0
*
Sl9
Reserved
0
S
20
Reserved
Non
e
S21
Bit-Manned Option
s
None
*
S
22
Bit-Manned Options
None
*
S23
Bit-Manoed Option
s
None
*
S
24
Reserved
Non
e
S
25
DelavToDTR
5
*
S26
RTS To CTS Delav Interva
l
1
*
S27
Bit-Mapped Ootion
s
None
*
S
28 - 29
Reserved
None
S30
Inactivity Time
r
0
*
S3 l - 3
5
Reserved
Non
e
S36
Nezotiation Failure Treatmen
t
7
*
S37
Desired Telephone Line Spee
d
O
*
S38
Delav Before Forced Disconnec
t
2
0
*
S39
Reserved
None
*
S
40
Bit-Maooed Ootions
(MNP
)
7
7
S41
Bit-Maooed Ootions
(MNP)
1
S
44
Unuse
d
3
*
S
46
Protocol Selecti
on
None
*
S48
V.42 Nezotiati
on Action
None*
S
49
Sneed Buffer Lower Limi
t
8 *
s
s o
Sneed Buffer Unoer Limit
255
*
S
82
Break Handlinz
None
S
86
Connecti
on Failure Cause Cod
e
None
S91
Proarammable Transmit Level
0
*
S95
Extended Result Codes
0
*
Page 26
.
:,:
·
Table 4-2. S Register Definitions
(Cont'd
)
REGISTE
R
DESCRIPTION
Wait For Carrier After Dial. Defines two
dela
y
times:
S
7
I.
D
uring
_
cal
l
es_tablishment,
this register establishes the tim
e
tha
t
the
Ex
ec�tive
Series waits for
carrier from the remote modem
befor
e
hanging up.
2
.
Se
ts
t�e le
n�h
of time
tha
t the Executive Series waits when the
"Wait
Range:
For Dialtone
call p
rogress feature (Win the dial
s
tring)
i
s
in
effect
20 • 255
seconds
·
Defau
lt:
5
0
Pause Time For Dial
Delay
.
Sets th
e
length
of ti
me to
pause
when the Ex
ecu
u
s
·
S 8
th
"P D . D
.
I" ll
ve enes
encounters e au
se
unng
ta
ca
progre
ss
feature, i.e., the
comma(,).
Range
:
0 • 2
55
Default
:
2
Carrier Detect Response Time. Dete
rmin
es how long a ca
rrier signal m
ust
be
prese
t
S
9
before the Executive Series
reco
gni
ses
it as a
carri
er and
turns on DCD. As th.is value n
increased
,
the
re is le
ss chance of
detectin
g
a fal
se
carrier due to noise from the
telephone
hne. ·
Range
:
I • 2
55 tenths
of
a seco
nd
Default:
6 (0.6
second)
Lo
st Carrier To
Hang-Up Delay.
Se
ts the
len
gth
of time the Executive Series waits befor
e
S
lO
hangi
ng up
after a loss of
carrier. This allows for a temporary
carrier lo
ss withou
t
causing
the l
ocal modem to disconnect. Whe
n
regist
er
SlO is set to 2
55, the modem functions a
s
if
ca
rrier is
always pr
esent.
The a
ctual interval the Executive Series wai
ts before disconnecting is the value in register
S
lO minus the value i
n
register
S9. Therefore, the SlO value must be greater than the S9
value or el
se the mode
m di
sconnects befo
re it reco
gnises the ca
rrier
.
Range
:
1 - 2
55 tenths of a secon
d
Default
:
1
4
(1.4
seconds)
DTMF Tone Duration. Se
ts the duration of tones
in
Dual Tone
Multi-Frequen
cy
(D
TMF)
S
ll
dialling.
This value has no effect
on
pulse dia
lling
.
Range
:
65 -
255 milli
secon
ds
Dejau/1
:
95 mi
lli
second
s
Escap
e
Code Guard Time
.
Sets the tim
e
delay
requir
ed immediately
befor
e and
after
S
12
enterin
g
t
he
escape
c
ode. The time interval between the sending of the first and second, o
r
the seco
nd and third
e
sca
pe
code character must
be less than t
he value of the guard time
.
Range
:
0-.
255
fi
ftieths ofa
sec
ond
Default
:
50 ( 1 second
)
S13
Reserved
.
4
8
Table 4-2.
S
Registe
r
Definitions (Cont'd)
REGISTER
DESCRIPTIO
N
Bit-Map1>ed
01itions.
Indicates the status of command options.
Sl4
BitO=AT
F
O -Disable
d
I· Enabled
Bit 1 =AT
E
0 • Disabled
1 · Enabled
Bit2=ATQ
0 -Disabl
ed
1 -Enabled
Bit3=A
TV
0-Numeric
1 - Verbos
e
B
it
4 = Reserved
Bit 5 = ATP or ATI
0-A
TI
I ·ATP
Bit 6 = Pa
rt of AT
Q
0-ATQO,
1
1-ATQ
2
Bit 7 =
Originate/
Answe
r
0 • Answer
l
·
Originate
S l 5
Reserved
.
Bit-Mappe
d
Tes
t
Options
.
Indicat
es
the test i
n
progress.
The AT&TO comman
d
S 1 6
terminates
an
y
test and sets S16 to zero.
Defau/1:
0
Bit O =Local
analogu
e
loopback (AT&Tl
)
O - Disabled (default)
1 - Enabled
B
it I = Not used
Bit
2 = L
ocal
digital
loo
pback (AT &T3
)
0 - Disabled (default)
1 -Enabl
ed
Bit
3 = Remot
e
digita
l
loopback
status (AT&T4 and T5
)
O
•
Loopbac
k
o
ff
I -
Loopback
in
progre
ss
Bit 4 = Remote digit
al loopback (AT &T6
)
0 - Disabled (default)
I - Enabled
Bit
5
=
Remot
e
digital loopback
wi
th se
lf test (AT &T7
)
o
-
Disable
d
(default)
1 -Enabl
ed
B
it
6 = Local
analogue
loopback wi
th self test (AT &TS)
0 - Disabled (default
)
I -Enable
d
Bit
7 = Not used
S17
Reserved.
Test Timer
.
Sets th
e
length
of time the Executive Series conduc
ts a test before retu
rning to
S18
the command
mode
.
If
thi
s
registe
r
is zero, the tes
t
w
ill
not automatically terminate; the tes
t
must
be
terminated
from the command mod
e
b
y
issuing an AT&TO or ATH command.
Range:
0 • 2
55
sec
ond
s
Default:
0
S19
Reserved
.
S
20
Reserved
.
4
9
Page 27
Delay
T
o
DTR.
Register
S
25 serves two
pu
rposes.
When the Executive Series is operatin
g
i
n
synchronous
mode 1 or 4, the value assign
ed to
825 spec
ifies the length of time the
modem waits after
a connection has been made before examining DTR. This allows the
modem
t
o
ignore
an ON-to-O
FF transiti
on of D
TR.,
gi
vin
g
the user sufficient time to
disconnect the modem from the
a
synchronou
s
termin
al and 'attach
it to a synchronou
s
terminal withou
t
forcing
the modem back to th
e
a
synchronou
s
command mode. During this
time
,
the value for S25 is read in seconds
(e.g.
the factory-set value of 5 equals
5
secon ds,
instead of 0.05 seconds).
In a
ll other
modes,
and after call establishment in synchronous modes 1 and 4, the value i
s
rea
d
in
1/100 seconds. In
any
mode,
a change in DTR (ON or OFF) that persist
s
for a
peri
od
shorter th
an the value held in 825 is
ignored
by
the modem w
hil
e
it
is in data mode.
Range:
O - 255
(0,0
1
second if mod
e 1 o
r 4 when in data mode
, 1 second otherwise
)
Default:
5
5
1
Table 4-2.
S
Registe
r
Definitions (Cont'd)
Reserved
.
Bit-Mappe
d
Options.
Indicates the status of command options
.
B
it
O
O=AT&T5
1 =AT&T4
B
it
l, 2
,
3 - Loc
al DTE rat
e
O = 0 - 300bp
s
1 = 600
bp
s
2
=
120
0
bp
s
3
=
2
400bp
s
4
=
4
800
bps
5 = 96
00
bps
6 = 1
9200
bps
7 = 3
840
0
bps
and abov
e
B
it
4
,
5
-
Pari
ty opti
on
0 = eve
n
1
=
not used
2 =od
d
3
=
none
B
it
6,
7
O=AT&GO
l
=AT&G
l
2=AT&G2
RTS To CT
S
Delay
Interval. Pe
rtai
ns to
synchronous
operation only. When CTS track
s
RTS
(AT&RO)
and the Executive Series detects and ON-to-OFF transition on RTS, thi
s
register
sets the tim
e
delay
before the modem turns
CT
S
ON.
Range:
0
-
25
5 hundredths of a second
Default:
1
DES
CRIPTION
S 2 6
S
2 S
S 2 4
S 2 3
REGISTE
R
·1·
· ·:•
:_.-:_:·i·�,·:
· ·.:
.·.·:_·
:
.
•
.
,
.
'
5
0
Table 4-2. S Register Definition
s
(Cont'd
)
REGISTE
R
DESCRIPTION
Bit-Mappe
d
Options
.
Indicates the status of comman
d
options.
S
2 1
B
it
O
O=AT&JO
I
=AT&J
l
Bit
I
O=AT&YO
I
=AT&Y
t
Bit
2
O=AT&RO
l=AT&Rl
B
it 3,
4
O=AT&DO
I =AT&Dl
2=AT&D2
3=AT&D3
Bit
5
O=AT&CO
l=AT&Ct
B
it
6
O=AT&80
I= AT&81
Bit7
O=ATY
O
1
=ATYl
Bit-Mapped Options. Indicates the status of command
options.
S 2
2
B
it
0
,
I
O=ATL
O
1
=AT
Ll
2 =ATL2
3 = ATL3
Bit2
,3
O=ATMO
I
=ATMl
2=ATM
2
3 =ATM
J
B
it 4, 5,
6
O=ATXO
l
=ATX
I
2=A
TX2
3=ATX3
4=ATX4
Bit
7
0
=
AT&PO
I
=AT&P
l
'
Page 28
5
3
Reserved.
DESCRIPTIO
N
A
T\N
3
A1\K5
A
1\A
3
A1\G
O
Attemp
t
to connect at speed of last AT command issued. For
D
TE
speeds greate
r
than 240
0
bps,
the Executive Series will
attemp
t
to connect at 2400 bps
.
Attemp
t
to connect at 3
00
bps
.
Reserved
.
Attemp
t
to connect at 1200 bps.
Attemp
t
to connect at 2400 bps.
Attemp
t
to connect at
4800 bps.
Attemp
t
to connect at 9600 bps.
Attemp
t
to connect at 12000 bps.
Attemp
t
to connect at 14400 bps.
Attemp
t
to connect at 7200
bps
.
BitO,
I
Bit
2
,
·
4
Bit 5,
6
B
it
7
S
37
=1-
3
S
37
=
4
S
37
=
5
S
37 = 6
S
37 = 8
S37 = 9
S37 = 1
0
S
37
•
11
537
=
12
0
S
37
=
o
Bit-Mapped Options
(MNP)
.
Indicates the status of comman
d options.
Range
:
Non
e
Defauft:
0000 000
1
BitO AT%C
l
B
it 1 AT%EO
Bit2 AT\LO
B
it 3 • 7 Not used
Protocol Selection. Controls selection of
compression
.
The following actions are execut
ed
for th
e
give
n
values
:
S46 = 1
36 Execute error correction
prot
oco
l
wi
th
no compression.
S46 • 138 Execute error correcti
on
prot
oco
l
wi
th compression.
In addition to B
TLZ
(V.42
bis),
the Executive Series also implements
MNP
5
da
ta
compression
.
BTLZ is use
d
only
wi
th LAP·M. and
MNP
5 only with
MNP4 as per th
e
CCITT recommendations
.
Table 4-2. S Register Definitions (Cont'd
)
Bit-Mapped Options
(
MNP).
Indicates the status of conunand options.
Range:
Non
e
DefaufL:
01
11 000
I
Desired
Telephone
Line Spee
d.
Range:
O
• 9 [f
an invalid number is entered, the number i
s
accepted
into th
e
register,
but S37 will act as if the default value is entered
.
Delay
Before Forced Disconnec
t
(Error-correctio
n
mode
only)
.
This register spec
ifies the
delay
between the Executive Series'
s
receipt
of the ATH command to di
sconnect (or ON-to
·
O
FF transition of DTR
if
the modem i
s
programmed
to follow the signal) and the disconnec
t
operation
.
For
an
error-correction c
onnection, this register can be
us
ed
to ensure that dat
a
in
the modem b
uffer is sent before
it di
sconnects
.
If
538 is set betwee
n O a
nd 254, th
e
Executive Series wi
ll wait that number of seconds for the remote modem to acknowledge all
dat
a
in
the modem buffer befor
e
disconnecting.
If
time
expire
s
before a
ll da
ta is sen
t, the NO
C
ARRIER result cod
e
w
ilt
be
issued to indicate that da
ta has been los
t.
If
all data is
transmitted
prio
r
t
o
timeout
,
th
e
respons
e
lo the A THO co
mmand will
be OK.
If S38 is set t
o
2
55,
th
e
Executive Series does not timeout, and continu
es to attempt to deliver
data in the buffer until the connecti
on is lost, or the da
ta is delivered
.
Range
:
.O -
2
55 secon
ds
Default:
2
0
Default:
S 4 6
S 4
1
S 4
0
S39
S 3
8
S
3 7
REGISTER
5
2
Table 4-2.
S
Registe
r
Definition
s
(Cont'd
)
REGISTE
R
DESCRIPTION
Bit-Mapped Option.
Indicates
the status of command
options.
S27
B
it
0
,
1
, 3 and 7
O=AT&QO
l = AT&Ql
2 =AT&Q2
3=AT&Q3
4
=AT&Q
4
5=AT&Q5
6=AT&Q6
7=AT&Q7
8=AT&Q8
9=AT&Q9
Bit.
2
O=AT&LO
I
=AT&Ll
Bit
4,
5
O=AT&XO
l=AT&Xl
2=AT&X2
Bit6
O=ATB
O
l =ATB
l
S28 - 2
9
Reserved
.
Inactivity
Timer
.
Determines
th
e
len
gth
of time, in ten
th of a second intervals, that th
e
S
3 0
Executive Series w
ill wait befor
e
disconnecting
whe
n no data i
s sent or received. In
:MN
P
o
r
V.42
mode,
any
data transmitted o
r receiv
ed will reset the timer. In other modes,
any
da
ta
transmitted w
ill reset the timer. Th
e
inactivity
timer is
.inoperativ
e
i
n
synchronou
s
mode
.
Range:
0-255
Default:
o
(disabled
)
S 3
.t - 3
5
Reserved.
Negotiati
on
Failur
e
Treatment
.
Thi
s
register
is read when the S48
register
contains th
e
S 3 6
value 1
28 or if
an
attempte
d
error correction
li
nk
fails. These fallbac
k options are initiate
d
immediately u
pon
connecti
on
if
S
48
=
128.
Range:
0-7
If an invalid number is entere
d, the number is accepte
d
into th
e
register
,
but S36 will act a
s
if
the default value is
entered
.
Default
:
7
The S36 actions arc
:
536 =O
Modem clisconnects
.
S36 = 1
Mode
m
stay
s
on-line a
nd a Direct mode connection is
established
.
536
-
2
Reserved
.
S36 = 3 Mode
m
stays
on-line and a Nonna! mod
e connection is
established.
S36 = 4 An
MNP connecti
on is attempted and
if
it fails, the
modem disconnects.
536 = 5
An MNP connection is
attempte
d
a
nd if it fails, a Direc
t
mode connection is established.
S36=7
An
MNP connecti
on is
attempte
d
and
if it fails, a Norma
l
mode connecti
on is established
.
Page 29
5
5
CONNE
CT result code indicates DCE speed instead of D
TE
speed.
Appe
nd
I
AR
Q
to verbose CONNECT
XXXX resu
lt cod
e
if
protoco
l
is not NONE
.
Enable C
ARRIER XXXX resu
lt
code.
Enable PROTOCOL
XXXX result code.
Reserved
.
Enable COMPRESSION result code
.
Reserved
.
Reserved.
-14dBm
-15 dB
m
B
it
l
Bit2
Bit
3
Bit4
B
it
5
Bit6
Bit7
Bit
O
89
1 = 1
4
S91 = 1
5
Ertended Result Codes. The bits in thi
s
register
can be se
t to override some of the A TW
n
comman
d
options.
A bit set to a l in thi
s
registe
r
wi
ll enable the corresponding result cod
e
regardless
of the ATWn se
tting.
DES
CRIPTION
Table 4-2.
S
Registe
r
Definitions (Cont'd)
The transm
it leve
l
may
not be alter
ed onc
e a connection exists
.
Programmabl
e
Transmit Levels. The transmi
t level is adjustable in S
91 fro
m O dB
m
(defau
lt
value)
to -15 dBm in
l
dB
increments for data transmission in both
synchronous an
d
a
synchronou
s
operation
.
This S register takes effect only when a leased line is selecte
d
via the A
T
&LI
command.
89
1
=
0 0
dB
m
89
1
=
l
-
1
dB
m
891 =
2
-
2
dB
m
S95
S91
REGISTE
R
·'.�i:��
-
..
.
;:��-
«:j�::;', :
9
•:=: .
.l
:
�
�
::.
·
,f
. . _ .. - -: �
: : �
:
...
5
4
Table 4-2.
S
Registe
r
Definition
s
(Cont'd
)
REGISTE
R
DESCRI,PTIO
N
V.42 Negotiation Action. The V.42 negotiation process determin
es th
e
capabilities
o
f
the
S48
remote modem. However, when th
e capabilities of the remote modem are
known
a
nd
negouanon is
unnecessary,
this
proces
s
can be
by-passed
if desired
.
Range:
0, 7, or 128
ff
an invali
d number is entered, it is
accepted
into the
8
register, but 848 wi
ll act as if 128 is entered
.
Default:
7
848 = 0
Disable negotiation
;
by-p
ass
the detection an
d
negotiatio
n
phases;
and
procee
d
with LAP-M.
848=7
Enabl
e
negotiation.
·
848 = 128 Disab
le negotiation; by-pass the detection a
nd
negotiation
phases; and proceed at once with the fallback actio
n
specified in S36. Can
be used to force
MNP
.
Break
HandHng
Options
.
Break
signals pr
ovide a way
for the user to
get
the attention of
S
82
the remote modem. The bre
ak ty
pe depends on the specifi
c
application
.
LAP-
M
spec
ifies
three methods of br
eak sign
al handling: in sequence, expedited, and destructive
.
Range:
3, 7, or 128
If
an invalid number is entered,
it is
accepte
d
into the 8
register, but S
82
w
ill
act as
if
the default value is entered
.
Default:
1
28
S
82 = 3 Expedited: Modem sends a break
immediately
;
data
integri
ty is maintaine
d both ahead of and
after the break
.
S
82 = 7 Destructive: Modems sends a br
eak
immediately
;
data
bei
ng
processed b
y
each modem at the time of the break is
destroyed.
S
82 = 128 I
n
sequence
:
Modem sends a break
in
sequence
with
any
tr
ansmitted data; data
integri
ty
is maintaine
d
bo
th
ahead of
and
after the break. (Factory default)
.
Connection Failure Cause Code. When the Executive Series issues a NO CA
RRIE
R result
S
86
code, a value is written to this 8 register t
o
hel
p
determine the reason for the faile
d
connection. S
86 records the first event that contribut
es to a NO CARRIE
R
message.
The
cause codes are:
S
86 = 0
Normal disconnect, no error occurred.
886 = 4
Loss of carrier
.
886=5
V.42
negotiation
failed to detect
an error-correction modem at
the other end
.
S86=
6
Other erro
r
correctin
g
modem did no
t
respond
t
o
featur
e
negotiati
on
message
sen
t
by
Executive Series
.
S86=
9
The modems could not find a common
protocol.
S
86 = 1
2
Normal disconnect initiate
d
b
y
the remote modem
.
886 = 1
3 remote modem does not
respon
d
after 10 re-transmissions of th
e
same message.
886 = 1
4 Protocol violation
.
Page 30
Executive Series Sample Connect
Strings
C
onnect with distant mode
m
only supportin
g
V.2
2
bis
(2400
bps).
ATWOS95=4
5
C
ARRIER 2400
PROTOCOL:NO
NE
CONNECT
2400
Connect with distant modem at V.32
bis
s
upporti
ng
V
.42
bis
.
ATW1S95=45
C
ARRIER 144
00
PROTOCOL: LAP-M
COMPRESSION: V.42BI
S
CONNECT 1440
0
Written
b
y
Joly
on Roberts
on o
f
CLASSIC Communications P
ty Ltd
.
5
7
Sets the modem for verbose
reportin
g
of c
onnect string
s
(see previous page).
Writes current activ
e
co
nfiguratio
n
profil
e
to store
d
NVRAM
pro
files
O an
d
1.
Sets modem to
factory
defaults, DCD to follow carrie
r
sign
al
and causes a disconnecti
on
upo
n
lowerin
g ofDTR.
Sampl
e
Initialisation Strings
Executive Series Note
s
Decimal-To-Bina
ry
Conversion Table
Bit Positi
on
Bit
7
Bit 6 Bit
5
Bit
4
Bit3 Bit2 Bit
1
Bit
O
Decima
l
1
28
64
32
1
6
8
4
2
1
Weighti
ng
Examples
1
1
0 0
0 0
1
0
1
l
45
0
0
1
0
1
1
0
1
217
l
1
0
1
l
0
0
I
255
I I I
l
I I
1
I
Th
e
i
nformati
on
supplied
b
y
Maestr
o
P
ty
Ltd in this document is believed to be accurate and reliable at the
tim
e
of printing.
How
ever,
no
responsibility
is a
ssume
d
b
y
Maestro P
ty Ltd.for its use, nor any infringement of
paten
ts
o
r
other
rights
o
f
thir
d
parties
which
may
r
esult
from
its use or misuse. This document is subjec
t t
o
chang
e
without
prior
notice
.
Cl Ma
estr
o
Pt
y
L
td 1993
.
All
Rights
Reserved.
AT&W&WI<CR
>
ATWl S95=4S<CR>
AT&F&Cl&D2<CR
>
5
6
CONNE
CT
xxxx (where
xxxx
represent
s
D
TE
speed
)
CONNECT
xxxxl
ARQ (
where
xx.xx
represent
s
DCE
speed)
ATWOS95=0
(Default)
Connec
t
wi
th
dista
nt mode
m
only supportin
g
V.
32 with
MNP levels 4 and 5
.
ATW1S95=45
C
ARRIER 9600
PROTOCO
L: ALT
COMPRESSION: CLASS
5
CONNECT 9600
ATW2S95=2
Page 31
•
•
•..
,
.
•
1
�
Page 32
Page 33
M
A
E
S
T
R
O
P
TY
.
L
T
D
.
Page 34
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