Codex 3265 User manual

Contents
v
326X Series Modem Reference Guide
Chapter 1. AT Commands
AT, AT& and AT
*
Command Descriptions ................................................. 1-5
Selecting Options and Settings ................................................................. 1-8
ATD (Dialing an Unstored Telephone Number) ........................................... 1-10
ATDS, AT
*
DS (Dialing a Stored Telephone Number) ............................... 1-10
ATE (Asynchronous Echo) ........................................................................... 1-11
ATH (Busy Out Test) .................................................................................... 1-11
ATL (Speaker Volume) ................................................................................. 1-11
ATM (Speaker Control)................................................................................. 1-12
ATO1 (Retrain) ............................................................................................. 1-12
ATP, ATT, AT
*
PT (Dial Type) ..................................................................... 1-13
ATQ (Result Codes) ...................................................................................... 1-13
ATS (S-Register)............................................................................................ 1-14
ATT (Dial Type) ............................................................................................ 1-14
ATV (Result Code Format) ........................................................................... 1-14
ATX (Call Progress) ..................................................................................... 1-15
ATY (Longspace Disconnect) ...................................................................... 1-18
ATZ (Selecting an Option Set) ...................................................................... 1-18
AT& Commands ........................................................................................... 1-19
AT&C (DCD Control)................................................................................... 1-19
AT&D (DTR Control) .................................................................................. 1-20
AT&F (Reinitialize Memory)........................................................................ 1-22
AT&G (Guard Tone) ..................................................................................... 1-22
AT&I (Display Modem ID) .......................................................................... 1-23
AT&J (Dial Line Jack Types) ........................................................................ 1-24
AT&L (Line Type) ........................................................................................ 1-25
AT&M (AT Data Format) ............................................................................. 1-26
AT&P (Pulse Cycle) ...................................................................................... 1-27
AT&R, AT
*
CT (CTS Control) .................................................................... 1-28
AT&S, AT
*
MR (DSR Control) ................................................................... 1-29
AT&T (Test) .................................................................................................. 1-30
AT&T4, AT&T5 (Accept RDL) .................................................................... 1-31
AT&V, AT
*
ST (Modem Status Display)...................................................... 1-31
Operating Status Messages ....................................................................... 1-32
DTE Rate/Status Summary ...................................................................... 1-34
Error-Correction and Data-Compression Status........................................ 1-35
Transmit and Receive Throughput and Link Utilization Status Display .. 1-36
EIA/TIA 232-D (CCITT V.24) Signal Status ............................................... 1-37
Status Summary Line ............................................................................... 1-38
Display Modem ID ................................................................................... 1-41
CQMS Parameter Status ........................................................................... 1-41
AT&W (Save Changes: Creating New Option Sets) ..................................... 1-45
AT&X (Clock) .............................................................................................. 1-47
AT&Y (Power Up in Option Set) ................................................................. 1-47

vi
Contents (continued)
Chapter 1. AT Commands (Continued)
AT&Z, AT
*
CN (Enter Telephone Numbers) ............................................... 1-48
AT
*
Commands ........................................................................................... 1-49
AT
*
AA (Answer) ........................................................................................ 1-49
AT
*
AP (Adaptive Rate) .............................................................................. 1-50
AT
*
AS (Answer in Restoral) ...................................................................... 1-51
AT
*
AY (Auto Type) .................................................................................... 1-52
AT
*
BD (Blind Dial) .................................................................................... 1-52
AT
*
BK (Break Handling) ........................................................................... 1-53
AT
*
CA (Answer/Originate Mode)............................................................... 1-53
AT
*
CD (DCD Loss Disconnect).................................................................. 1-54
AT
*
CM (Connect Message)......................................................................... 1-54
AT
*
CN, AT&Z (Entering Telephone Numbers) ......................................... 1-54
AT
*
CT, AT&R (C, TS) ................................................................................ 1-54
AT
*
DA (Default Dialing) ............................................................................ 1-55
AT
*
DB (Buffer Delay) ................................................................................ 1-56
AT
*
DC (Data Compression) ....................................................................... 1-57
AT
*
DD (Dial Wait) ..................................................................................... 1-57
AT
*
DE (DTE Rate)...................................................................................... 1-58
AT
*
DF (Data Format) ................................................................................. 1-59
AT
*
DI (Leased to Dial Option) ................................................................... 1-59
AT
*
DL (RTS/CTS Delay) ........................................................................... 1-60
AT
*
DP (Pause Delay) ................................................................................. 1-60
AT
*
DR (Auto Redial) ................................................................................. 1-61
AT
*
DS, ATDS (Dial a Stored Telephone Number) ..................................... 1-61
AT
*
DT (DTR Delay) .................................................................................. 1-61
AT
*
EC (Error Correction) ........................................................................... 1-62
AT
*
FC (Fast Call)........................................................................................ 1-63
AT
*
FL (Flow Control) ................................................................................ 1-64
AT
*
HD (Hold Dial Line) ............................................................................ 1-66
AT
*
LA (DTE Circuit 141)........................................................................... 1-68
AT
*
LC (Line Compensation)....................................................................... 1-68
AT
*
LD (DTE Circuit 140)........................................................................... 1-69
AT
*
LE (Dial to Leased Option, Automatic Disconnect) ............................ 1-69
AT
*
LL (Local Analog Loopback Test Busy Out) ....................................... 1-70
AT
*
LN (Link Telephone Numbers)............................................................. 1-70
AT
*
LS (Low Speed) .................................................................................... 1-71
AT
*
LT (DTE Pin 25) ................................................................................... 1-72
AT
*
MD (PSTN Signaling) .......................................................................... 1-72
AT
*
MF (Modem Flow Control) .................................................................. 1-74
AT
*
MM (Modulation Mode) ...................................................................... 1-74
AT
*
MN (Minimum Rate) ........................................................................... 1-76
AT
*
MR, AT&S (DSR Control) ................................................................... 1-76
AT
*
MS (AT Messages) ............................................................................... 1-76
AT
*
MX (Maximum Rate) ........................................................................... 1-77

vii
Contents (continued)
Chapter 1. AT Commands (Continued)
AT
*
NB (Buffer Option) .............................................................................. 1-77
AT
*
NC (Network Compensation)................................................................ 1-78
AT
*
ND (View Stored Telephone Numbers) ............................................... 1-78
AT
*
OC (External Control) .......................................................................... 1-79
AT
*
OP (External Option Set Select) ........................................................... 1-79
AT
*
OS (Overspeed) .................................................................................... 1-80
AT
*
PE (Enable/Disable Password Protection) ........................................... 1-80
AT
*
PF (Set Protection) ............................................................................... 1-80
AT
*
PN (Unlock Password Protection)......................................................... 1-81
AT
*
PT (Dial Type) ...................................................................................... 1-81
AT
*
PW (Change Password) ........................................................................ 1-82
AT
*
RA (Remote Access) ............................................................................ 1-82
AT
*
RC (Initiate, Terminate, orAbort Remote Configuration Session) ...... 1-83
Initiating a Remote Configuration Session with a Dial Modem .............. 1-83
Initiating a Remote Configuration Session with a Leased Line Modem .. 1-85
Terminating a Remote Configuration Session .......................................... 1-86
Aborting a Remote Configuration Session ............................................... 1-86
AT
*
RE (Initiate/Terminate Restoral) .......................................................... 1-87
AT
*
RP (Parity) ............................................................................................ 1-90
AT
*
RS (RTS Control) ................................................................................. 1-91
AT
*
RT (Auto Retrain) ................................................................................. 1-92
AT
*
SC (Speed Conversion) ........................................................................ 1-93
AT
*
SI (DTE Inactivity) ............................................................................... 1-93
AT
*
SL (Error Correction ID)....................................................................... 1-94
AT
*
SM (Data Transfer Mode) .................................................................... 1-94
AT
*
SR (RTS/DCD Remote Signaling) ....................................................... 1-96
AT
*
ST, AT&V (Modem Status Display) .................................................... 1-97
AT
*
TD (Throughput Delay Minimization) ................................................. 1-97
AT
*TL (Tone Length) ................................................................................. 1-98
AT*TT (Call Timeout) ................................................................................. 1-98
AT*XC (Error Correction Reliable Messages) ........................................... 1-99
AT*ZC (Callback Feature)........................................................................... 1-100
AT*ZD (Dial Restricted) ............................................................................. 1-101
AT*ZI (Enter Access Security Group Password) ........................................ 1-101
AT*ZP (Select Tones withAccess Security) ............................................... 1-102
AT*ZR (Remote Number Required) ........................................................... 1-102
AT*ZS (Simulated Ringback)...................................................................... 1-103
AT*ZV (Password Verification) .................................................................. 1-103

viii
Contents (continued)
Chapter 2. Front Panel Operation
Introduction .................................................................................................. 2-2
Status/Option Sets/Dialing Menu ................................................................. 2-3
Test Options .................................................................................................. 2-5
Modulation Options ...................................................................................... 2-6
Restoral Options ........................................................................................... 2-8
Restoral Indications .................................................................................. 2-9
Configuring for Dial Restoral ................................................................... 2-10
Interpreting the DTR Option Setting......................................................... 2-13
Error Correction and Data Compression Options ......................................... 2-14
ACU Options ................................................................................................ 2-15
ACU Selection .......................................................................................... 2-16
V.25 bis Data Format ................................................................................ 2-17
NoACU Data Format................................................................................. 2-17
Character Length....................................................................................... 2-18
V.25 bis Character Selection .................................................................... 2-18
Sync Idle ................................................................................................... 2-18
V.25 bis Responses ................................................................................... 2-19
LPDA2 Address ........................................................................................ 2-19
LPDA2 Identification Number.................................................................. 2-20
LPDA2 Determination ............................................................................. 2-20
Terminal Options .......................................................................................... 2-20
Telco Options................................................................................................. 2-23
Dial Line Transmit Level ......................................................................... 2-24
Leased Line Transmit Level ..................................................................... 2-24
Dialing Options ............................................................................................. 2-25
Front Panel Security Options ........................................................................ 2-26
Unlocking the Modem............................................................................... 2-27
Access Security Options................................................................................ 2-28
Group PW Enable/Disable........................................................................ 2-29
If the Answer Modem Is Not Using the Callback Feature........................ 2-30
If the Calling Modem Is Providing the Callback Number ....................... 2-31
Using the Callback Feature with an Originate-Only Modem .................. 2-33
Manual Dialing and Callback DTMF Equivalencies ............................... 2-33
Network Control Options ............................................................................. 2-34
Override Mode ......................................................................................... 2-35
Network Control Address.......................................................................... 2-35
Network Control Port Rate ....................................................................... 2-36
Pass Thru .................................................................................................. 2-36
Remote Configuration Options ..................................................................... 2-37
Setting a Remote Modem's Leased Line Address .................................... 2-40
Searching for a Remote Modem's Leased Line Address .......................... 2-41
Setting or Searching for a Remote Modem's Leased Line Address ......... 2-43
Performing Numeric Entry............................................................................ 2-45

ix
Contents (continued)
Chapter 3. Automatic Calling Interfaces
Introduction .................................................................................................. 3-3
V.25 bis ACU ................................................................................................ 3-3
Call Establishment Methods ..................................................................... 3-6
Modem Configuration .............................................................................. 3-6
Addressed Mode........................................................................................ 3-7
V.25 bis Commands ............................................................................. 3-7
V.25 bis Responses ............................................................................... 3-10
Call Failure Responses ......................................................................... 3-11
Call Progress Responses ...................................................................... 3-12
Result Code Responses......................................................................... 3-12
Reliable Connection Response ............................................................. 3-13
Programming Guide for the V.25 bis Auto-Call Unit (ACU) ................... 3-13
Asynchronous Frame Format ............................................................... 3-14
Synchronous Bit-Oriented Frame Format ............................................ 3-15
Synchronous Character-Oriented Frame Format ................................. 3-16
V.25 bis Control Signaling in Addressed Mode ....................................... 3-17
Idle Condition ...................................................................................... 3-17
Dialog State........................................................................................... 3-18
Connecting State .................................................................................. 3-18
Data State ............................................................................................. 3-19
Disconnecting ...................................................................................... 3-19
Direct Mode............................................................................................... 3-20
Direct Answering ................................................................................. 3-20
Direct Dialing........................................................................................ 3-20
Manual Answering and Dialing................................................................. 3-20
Manual Answering................................................................................ 3-21
Manual Dialing ..................................................................................... 3-21
LPDA2 Command Set................................................................................... 3-22
How to Configure for LPDA2 ACU.......................................................... 3-22
LPDA2 ACU Control Commands ............................................................ 3-22
LPDA2 Message Format........................................................................... 3-23
Information Field Format and Command ................................................. 3-23
Header (H) ........................................................................................... 3-24
Identifier (I)........................................................................................... 3-24
Modem Address (A).............................................................................. 3-24
Command Code (C).............................................................................. 3-24
Data Field (D) ...................................................................................... 3-24
Information Field Format and Response................................................... 3-25
Header (H) Response Field .................................................................. 3-25
Identifier Field (I).................................................................................. 3-25
Modem Address (A) ............................................................................. 3-26
Command Code (C) ............................................................................. 3-26
Sense Byte (SB) ................................................................................... 3-26
Data Field (D) ...................................................................................... 3-26
Framing Rules........................................................................................... 3-27
LPDA2 Dial Command ............................................................................ 3-27
Dial Command Sense Bytes ................................................................. 3-30
Dial Response Data Field ..................................................................... 3-31

x
Contents (continued)
Chapter 3. Automatic Calling Interfaces (Continued)
LPDA2 Disconnect Command.................................................................. 3-31
Disconnect Command Sense Byte........................................................ 3-31
Disconnect Response Data Field .......................................................... 3-32
Using an External Auto-Call Unit (Bell 801C or Codex 2207)..................... 3-33
To Initiate a Call... ................................................................................ 3-33
To Terminate a Call............................................................................... 3-33
Chapter 4. Testing Your Modem
Introduction .................................................................................................. 4-2
Quick Checks ................................................................................................ 4-2
Automatic Self-Test ...................................................................................... 4-2
Starting the Automatic Self-Test .............................................................. 4-3
Handling Error Messages ......................................................................... 4-3
System Testing............................................................................................... 4-4
326XFAST Synchronous Data Compression Testing .............................. 4-5
Local Analog Loopback Test (AT&T1)..................................................... 4-5
Local Analog Loopback Pattern Test (AT&T8) ....................................... 4-8
Remote Digital Loopback Test (AT&T6) ................................................. 4-10
Remote Digital Loopback Pattern Test (AT&T7) .................................... 4-12
Data Mode Pattern Test ............................................................................ 4-14
Local Digital Loopback (AT&T3) ............................................................ 4-16
Busy Out (ATH1) ..................................................................................... 4-18
Retrain (AT01) .......................................................................................... 4-19
326XFAST DTE Cable Diagnostics ........................................................ 4-20
Chapter 5. Specifications
Introduction .................................................................................................. 5-2
Physical Characteristics ................................................................................ 5-2
Operating Mode Characteristics ................................................................... 5-2
Telephone Line Type ................................................................................ 5-2
FAST Modulation Mode .......................................................................... 5-2
V.32 bis Modulation Mode ....................................................................... 5-2
V.32 Modulation Mode ............................................................................ 5-3
V.22 bis Modulation Mode ....................................................................... 5-3
V.22 Modulation Mode ............................................................................. 5-3
Bell 212 Modulation Mode ...................................................................... 5-3
V.21 Modulation Mode ............................................................................. 5-4
Bell 103 Modulation Mode ...................................................................... 5-4
Environmental Limits ................................................................................... 5-4
Primary Power Requirements ....................................................................... 5-4
Transmitter .................................................................................................... 5-5
Output Level.............................................................................................. 5-5
Transmitter Timing.................................................................................... 5-5

xi
Contents (continued)
Appendix A. ASCII/EBCDIC Hexadecimal Equivalents
Appendix B. Options and Displays Worksheet
Index

AT Commands 1-1
Chapter 1
AT Commands
Contents
AT, AT& and AT*Command Descriptions ................................................. 1-5
Selecting Options and Settings ................................................................. 1-8
ATD (Dialing an Unstored Telephone Number) ........................................... 1-10
ATDS, AT*DS (Dialing a Stored Telephone Number) ............................... 1-10
ATE (Asynchronous Echo) ........................................................................... 1-11
ATH (Busy Out Test) .................................................................................... 1-11
ATL (Speaker Volume) ................................................................................. 1-11
ATM (Speaker Control)................................................................................. 1-12
ATO1 (Retrain) ............................................................................................. 1-12
ATP, ATT, AT*PT (Dial Type) ..................................................................... 1-13
ATQ (Result Codes) ...................................................................................... 1-13
ATS (S-Register)............................................................................................ 1-14
ATT (Dial Type) ............................................................................................ 1-14
ATV (Result Code Format) ........................................................................... 1-14
ATX (Call Progress) ..................................................................................... 1-15
ATY (Longspace Disconnect) ...................................................................... 1-18
ATZ (Selecting an Option Set) ...................................................................... 1-18
AT& Commands ........................................................................................... 1-19
AT&C (DCD Control)................................................................................... 1-19
AT&D (DTR Control) .................................................................................. 1-20
AT&F (Reinitialize Memory)........................................................................ 1-22
AT&G (Guard Tone) ..................................................................................... 1-22
AT&I (Display Modem ID) .......................................................................... 1-23
AT&J (Dial Line Jack Types) ........................................................................ 1-24
AT&L (Line Type) ........................................................................................ 1-25
AT&M (AT Data Format) ............................................................................. 1-26
AT&P (Pulse Cycle) ...................................................................................... 1-27
AT&R, AT*CT (CTS Control) .................................................................... 1-28
AT&S, AT*MR (DSR Control) ................................................................... 1-29
AT&T (Test) .................................................................................................. 1-30
AT&T4, AT&T5 (Accept RDL) .................................................................... 1-31

1-2 AT Commands
Contents (continued)
AT&V, AT*ST (Modem Status Display)...................................................... 1-31
Operating Status Messages ....................................................................... 1-32
DTE Rate/Status Summary ...................................................................... 1-34
Error-Correction and Data-Compression Status........................................ 1-35
Transmit and Receive Throughput and Link Utilization Status Display .. 1-36
EIA/TIA 232-D (CCITT V.24) Signal Status ............................................... 1-37
Status Summary Line ............................................................................... 1-38
Display Modem ID ................................................................................... 1-41
CQMS Parameter Status ........................................................................... 1-41
AT&W (Save Changes: Creating New Option Sets) ..................................... 1-45
AT&X (Clock) .............................................................................................. 1-47
AT&Y (Power Up in Option Set) ................................................................. 1-47
AT&Z, AT*CN (Enter Telephone Numbers) ............................................... 1-48
AT*Commands ........................................................................................... 1-49
AT*AA (Answer) ........................................................................................ 1-49
AT*AP (Adaptive Rate) .............................................................................. 1-50
AT*AS (Answer in Restoral) ...................................................................... 1-51
AT*AY (Auto Type) .................................................................................... 1-52
AT*BD (Blind Dial) .................................................................................... 1-52
AT*BK (Break Handling) ........................................................................... 1-53
AT*CA (Answer/Originate Mode)............................................................... 1-53
AT*CD (DCD Loss Disconnect).................................................................. 1-54
AT*CM (Connect Message)......................................................................... 1-54
AT*CN, AT&Z (Entering Telephone Numbers) ......................................... 1-54
AT*CT, AT&R (C, TS) ................................................................................ 1-54
AT*DA (Default Dialing) ............................................................................ 1-55
AT*DB (Buffer Delay) ................................................................................ 1-56
AT*DC (Data Compression) ....................................................................... 1-57
AT*DD (Dial Wait) ..................................................................................... 1-57
AT*DE (DTE Rate)...................................................................................... 1-58
AT*DF (Data Format) ................................................................................. 1-59
AT*DI (Leased to Dial Option) ................................................................... 1-59

AT Commands 1-3
Contents (continued)
AT*DL (RTS/CTS Delay) ........................................................................... 1-60
AT*DP (Pause Delay) ................................................................................. 1-60
AT*DR (Auto Redial) ................................................................................. 1-61
AT*DS, ATDS (Dial a Stored Telephone Number) ..................................... 1-61
AT*DT (DTR Delay) .................................................................................. 1-61
AT*EC (Error Correction) ........................................................................... 1-62
AT*FC (Fast Call)........................................................................................ 1-63
AT*FL (Flow Control) ................................................................................ 1-64
AT*HD (Hold Dial Line) ............................................................................ 1-66
AT*LA (DTE Circuit 141)........................................................................... 1-68
AT*LC (Line Compensation)....................................................................... 1-68
AT*LD (DTE Circuit 140)........................................................................... 1-69
AT*LE (Dial to Leased Option, Automatic Disconnect) ............................ 1-69
AT*LL (Local Analog Loopback Test Busy Out) ....................................... 1-70
AT*LN (Link Telephone Numbers)............................................................. 1-70
AT*LS (Low Speed) .................................................................................... 1-71
AT*LT (DTE Pin 25) ................................................................................... 1-72
AT*MD (PSTN Signaling) .......................................................................... 1-72
AT*MF (Modem Flow Control) .................................................................. 1-74
AT*MM (Modulation Mode) ...................................................................... 1-74
AT*MN (Minimum Rate) ........................................................................... 1-76
AT*MR, AT&S (DSR Control) ................................................................... 1-76
AT*MS (AT Messages) ............................................................................... 1-76
AT*MX (Maximum Rate) ........................................................................... 1-77
AT*NB (Buffer Option) .............................................................................. 1-77
AT*NC (Network Compensation)................................................................ 1-78
AT*ND (View Stored Telephone Numbers) ............................................... 1-78
AT*OC (External Control) .......................................................................... 1-79
AT*OP (External Option Set Select) ........................................................... 1-79
AT*OS (Overspeed) .................................................................................... 1-80
AT*PE (Enable/Disable Password Protection) ........................................... 1-80
AT*PF (Set Protection) ............................................................................... 1-80

1-4 AT Commands
Contents (continued)
AT*PN (Unlock Password Protection)......................................................... 1-81
AT*PT (Dial Type) ...................................................................................... 1-81
AT*PW (Change Password) ........................................................................ 1-82
AT*RA (Remote Access) ............................................................................ 1-82
AT*RC (Initiate, Terminate, or Abort Remote Configuration Session) ...... 1-83
Initiating a Remote Configuration Session with a Dial Modem .............. 1-83
Initiating a Remote Configuration Session with a Leased Line Modem .. 1-85
Terminating a Remote Configuration Session .......................................... 1-86
Aborting a Remote Configuration Session ............................................... 1-86
AT*RE (Initiate/Terminate Restoral) .......................................................... 1-87
AT*RP (Parity) ............................................................................................ 1-90
AT*RS (RTS Control) ................................................................................. 1-91
AT*RT (Auto Retrain) ................................................................................. 1-92
AT*SC (Speed Conversion) ........................................................................ 1-93
AT*SI (DTE Inactivity) ............................................................................... 1-93
AT*SL (Error Correction ID)....................................................................... 1-94
AT*SM (Data Transfer Mode) .................................................................... 1-94
AT*SR (RTS/DCD Remote Signaling) ....................................................... 1-96
AT*ST, AT&V (Modem Status Display) .................................................... 1-97
AT*TD (Throughput Delay Minimization) ................................................. 1-97
AT*TL (Tone Length) ................................................................................. 1-98
AT*TT (Call Timeout) ................................................................................. 1-98
AT*XC (Error Correction Reliable Messages) ........................................... 1-99
AT*ZC (Callback Feature)........................................................................... 1-100
AT*ZD (Dial Restricted) ............................................................................. 1-101
AT*ZI (Enter Access Security Group Password) ........................................ 1-101
AT*ZP (Select Tones withAccess Security) ............................................... 1-102
AT*ZR (Remote Number Required) ........................................................... 1-102
AT*ZS (Simulated Ringback)...................................................................... 1-103
AT*ZV (Password Verification) .................................................................. 1-103

AT Commands 1-5
AT, AT& and AT*Command Descriptions
This chapter provides an alphabetic list of theAT commands that you can execute
from the control terminal and the modem front panel.
AT commands and options are described in the following sequence:
• A pull-out main menu figure (Figure 1-1) illustrating all AT, AT& and AT*
command settings, front panel options, and option settings
• A front panel option figure in the left margin describing how to select a
command on the modem front panel
• Industry-standard AT and AT& commands that begin withAT
• Motorola-enhanced AT commands, which begin with AT*
• A list of the menu's front panel options, if any, that have AT-equivalent control
terminal commands
NOTES:
1) For descriptions of front panel options and option settings that do not haveAT
command equivalents, see Chapter 2, Front Panel Operation. Chapter 2 is
organized to follow the structure of the front panel menu tree; the main menu
is divided into submenu sections, describing the appropriate options and
settings. For a list ofAT commands that do not have front panel equivalents,
see “Non-Configuration AT Commands” in Chapter 5, Using the AT
Automatic Calling Interface, of the 326X Series Modem User’s Guide.
2) Throughout this guide, all references to the 326X Series Modem apply to the
326X V.32 bis, 326XFAST, and 326XFAST-SDC Modems, unless specifically
stated otherwise.

1-6 AT Commands
Figure 1-1. 326X Series Main Menu

AT Commands 1-7

1-8 AT Commands
Selecting Options and Settings
The figure in the left margin that precedes eachAT command illustrates the main-
menu option, the right-arrow ( ) button indicating that you must press the across
key until the described option appears, and the resulting submenu option. For
example, the firstAT command in the following list isATD, Dialing an Unstored
Telephone Number. In the figure accompanying this entry, you see:
• The main-menu option to access: Data 9600 T/D?
• The front panel control key to press to display the submenu
• The ATD Command prompt: Enter Then Dial
Each front panel option has a default setting. Some front panel defaults are
determined by the assigned factory-preset option sets. These preset defaults are
exclusive to the particular option set. The other factory options are not exclusive to a
particular option set and they always have the same default setting, regardless of
which factory-preset option set you are using.
For options that belong to option sets, a number or the word “all” in parentheses
appears underneath the selection. A number tells you which option set(s) the setting
is a default for. If the word “all” appears under a setting, it means that the setting is
the default setting for all four option sets.
As an example, the option setting portion of the DTR Control (AT&D) option
appears as follows:
Option Setting
High
(1, 4L)
Escape
Discon
(4D)
Reset
Tail
(2)1
108.1
(3)1
108.2
(2, 3)
1Default for the 326XFAST-SDC Modem

AT Commands 1-9
The defaults for the DTR Control option for the 326X V.32 bis and 326XFAST
modem are:
•High for Option sets 1 and 4 (the “L” next to the 4 indicates that High is the
default for Option Set 4 for leased line modems (models 3261, 3263, 3266,
3268)
•Discon for Option set 4 (the “D” next to the 4 indicates that Discon is the
default for Option set 4 for dial modems (models 3260, 3262, 3265, 3267)
•108.2 for Option sets 2 and 3
The defaults for the DTR Control option for the 326XFAST-SDC modem are:
•High for Option sets 1 and 4 (the “L” next to the 4 indicates that High is the
default for Option Set 4 for leased line modems (models 3261, 3263, 3266,
3268)
•Tail for Option set 2
•108.1 for Option set 3
In this example, since High is the default for Option sets 1 and 4L for all products
(326X V.32 bis, 326XFAST, and 326XFAST-SDC), no product-specific distinction is
made. Where one setting (for example, 108.1) is the default for Option set 3 in the
326XFAST-SDC product, a footnote indicates the difference.
Unless specified by a “D” or an “L,” defaults apply to all models. For options that do
not belong to option sets, the default setting is designated by the word “default” in
parentheses underneath the setting.
The following sections describe industry-standard AT commands that begin with AT.
NOTES:
1) The conventions described for identifying front panel option settings and
defaults apply to the 326X V.32 bis, 326XFAST, and 326XFAST-SDC
Modems. Option settings that vary are clearly marked indicating to which
product the default setting applies.
2) Throughout this chapter, AT commands are listed in table format. In the
“AT Command Setting” column, the AT reference has been omitted; however,
be sure to enter the entire AT command. For example:
AT*ZCO

1-10 AT Commands
ATD (Dialing an UnstoredTelephone Number)
The ATD (Enter Then Dial) command allows you to dial a telephone number (up to
50 characters) without storing it in your modem's telephone book.
The ATD Command
You can dial a telephone number directly from your keyboard. To do this, enter the
ATD command followed by the telephone number and a carriage return.
For example:
ATD5551234<CR>
The Front Panel
See the "Performing Numeric Entry" section in Chapter 2 of this guide for details on
how to use numeric entry.
ATDS, AT*DS (Dialing a StoredTelephone Number)
The ATDS and AT*DS (Dial From #) commands dial a number stored in one of the
modem's nine “telephone book” addresses. NOTE: Enter a telephone number into
your modem's telephone book before attempting to use this option. See “AT&Z,
AT*CN (Enter Phone Numbers)” for information on entering phone numbers.
The ATDS or AT*DS Command
To dial a stored telephone number using AT commands, enter:
ATDS
or
AT*DS
followed by the telephone book address number and a carriage return <CR>. If you
enter the ATDS or AT*DS command without a number following it, the modem
dials the number stored in address 1. NOTE: TheATDS andAT*DS commands can
also be entered in the format ATDS=n or AT*DS=n.
The Front Panel
To use the front panel to dial a telephone number stored in the modem's telephone
book:
1) Step across the Status/Option Sets/Dialing menu by pressing until you see:
Dial from #=n
2) Press the to select the telephone book address for the number you want to
dial and press . The modem dials the telephone number stored in the
designated telephone book address.
Option Setting AT Command Setting
1 – 9 1 – 9
Option Setting AT Command Setting
DATA 9600 T/D?
EnterThen Dial
•••
DATA 9600 T/D?
Dial From #
• • •
D, DS, *DS

AT Commands 1-11
ATE (Asynchronous Echo)
TheATE (Async Echo) command enables the modem to echo all commands received
from an asynchronous DTE.
ATH (Busy OutTest)
The ATH command enables you to initiate a Busy Out test.
Refer to Chapter 4, of this guide or theAT&T option description within this chapter,
for a detailed description of how to initiate and terminate the Busy Out test.
ATL (Speaker Volume)
The ATL (Volume) option sets the speaker volume in the modem.
Option Setting AT Command Setting Description
Off 0 The modem does not echo asynchronous
commands to the DTE.
On
(all)
1 The modem echoes asynchronous commands to
the DTE.
Option Setting AT Command Setting Description
Busy Out 1 Makes the modem appear busy to incoming calls.
To configure the modem to use the Busy Out
feature, refer to theAT*LT (DTE Pin 25) option
description in this chapter
End Test 0 If Busy Out is enabled,ATH0 will disconnect the
busy out condition.Also, if the modem is in
“escape mode” (the modem has transitioned to
command state from the data state—online or
test), the ATH0 command disconnects the
modem.
Option Setting AT Command Setting Description
Medium
(all)
2 Medium
Loud 3 Loud
Soft 0,1 Soft
ACU OPT’S
Async Echo
• • •
TEST OPT’S
Test
• • •
TELCO OPT’S
Volume
• • •
E, H, L

1-12 AT Commands
ATM (Speaker Control)
The ATM (Speaker) option controls the operation of the modem's speaker.
ATO1 (Retrain)
ATO1 allows you to return to data mode and initiate a retrain with the remote
modem. Refer to Chapter 4, TestingYour Modem, or the AT&T option description
within this chapter for a description of how to initiate a retrain.
Option Setting AT Command Setting Description
Dialing
(all)
1 The speaker comes on while dialing and training
but stays off when the modem enters data mode.
On 2 The speaker is always on.
Security 3 The speaker goes on when dialing is completed
and goes off when the modem enters data mode.
Off 0 The speaker is always off.
Option Setting AT Command Setting Description
0 Return to data mode.
Retrain 1 Allows you to initiate a retrain with the remote
modem.
TELCO OPT’S
Speaker
• • •
TEST OPT’S
Test
• • •
M, O1

AT Commands 1-13
ATP, ATT, AT*PT (DialType)
The ATP, ATT and AT*PT (Dial) commands determine how the modem dials
telephone numbers: in tone, pulse, or auto tone/pulse. The modem refers to this
option setting if it does not encounter any T or P modifiers in the telephone number.
ATQ (Result Codes)
The ATQ (Rslt Code) command selects whether result codes (including Call
Progress messages) are displayed.
Option Setting AT Command Setting Description
Tone ATT
AT*PT0
The modem uses tone (DTMF) dialing unless
otherwise specified by the T or P dial modifiers
in a telephone number.
Pulse ATP
AT*PT1
The modem uses pulse dialing unless otherwise
specified by the T or P dial modifiers in a
telephone number.
Auto AT*PT2 The auto-call unit attempts to tone dial when
initiating a call. If tone dialing is not possible,
pulse dialing is used.
For this feature to work correctly, the first
character in a dial string must be a digit, and not
a dial modifier.A T or P in the dial string
overrides this setting for that dial string.
NOTE: Do not use the Auto setting if you are in
a PBX environment. If a dial tone is detected
after the first digit, the phone number will be
redialed as a pulse which may not be
recognizable by the PBX.
Option Setting AT Command Setting Description
Enable
(all)
0 Result codes are displayed at the DTE.
Disable 1 Result codes are not displayed at the DTE.
Orig 2 Result codes are output to the DTE only when
operating as an originate modem.
DIALING OPT’S
Dial
• • •
ACU OPT’S
Rslt Code
• • •
P, T, *PT, Q