Maxim Integrated 73M1822, 73M1922 User Manual

Simplifying System IntegrationTM

73M1822/73M1922 MicroDAA

Teridian V.22 bis

Linux Softmodem for

User Guide

Rev. 1.5

April 7, 2009

UG_1x22_043

V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide UG_1x22_043

© 2009 Teridian Semiconductor Corporation. All rights reserved.
Teridian Semiconductor Corporation is a registered trademark of Teridian Semiconductor Corporation.
Simplifying System Integration is a trademark of Teridian Semiconductor Corporation.
Hayes, Hayes AT, Smartcom and Smartmodem are registered trademarks of Hayes Microcomputer Products.
IBM, IBM PC, IBM AT and PS/2 are registered trademarks of IBM.
MNP is a registered trademark of Microcom.
Tri-state is a registered trademark of National Sem iconductor Corporation.
All other trademarks are the property of their respective owners.

Teridian Semiconductor Corporation makes no warranty for the use of its products, other than ex pressly
contained in the Company’s warranty det ai l ed i n the Teridian Semiconductor Corporation standard Terms
and Conditions. The company assumes no resp onsibility for any errors which may appear in thi s
document, reserves the right to change device s or specifications detailed herein at any ti m e without
notice and does not make any commitment to update the information contained herein. Accordingly, the
reader is cautioned to verify that this document is current by comparing it to the latest version on
http://www.teridian.com or by checking with your sales representative.

Teridian Semiconductor Corp., 6440 Oak Cany on, Suite 100, Irvine, CA 92618

TEL [phone], FAX [phone], http://www.teridian.com

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Table of Contents

Introduction ............................................................................................................................... 6

1

1.1

Use of this Document ................................................................................................................... 6

Language and Terminology ......................................................................................................... 6

1.2

Registered Trademarks ............................................................................................................... 6

1.3

User Guide ................................................................................................................................. 7

2

2.1

The AT Command Format ........................................................................................................... 7

S-Registers ................................................................................................................................ 20

2.2

S-Register Overview ...................................................................................................... 20

2.2.1

Auto Answer .................................................................................................... 21

S0

Ring Count ...................................................................................................... 21

S1

Escape Code Character .................................................................................. 21

S2

Carriage Return Character .............................................................................. 21

S3

Line Feed Character ....................................................................................... 22

S4

Backspace Character ...................................................................................... 22

S5

Wait Before Blind Dial ..................................................................................... 22

S6

Wait For Carrier After Dial ............................................................................... 22

S7

Pause Time For Comma ................................................................................. 23

S8

Carrier Detect Response Time ....................................................................... 23

S9

Lost Carrier Hang Up Delay ............................................................................ 23

S10

S99 Preset Country Selection ................................................................................ 24

DTMF Ton/Toff Dialing Speed ........................................................................ 24

S11

DTMF / Twist Dial Register ............................................................................. 25

S12

DTMF-Data / Transmit Attenuation ................................................................. 26

S13

DTMF- DAC transmit level coefficient ............................................................. 26

S85

Pulse Dial Make Time ..................................................................................... 27

S32

Pulse Dial Break Time ..................................................................................... 27

S33

Pulse Dial Inter-digit Time ............................................................................... 27

S34

Pulse Map \ CID control \ Black Listing control ............................................... 27

S72

Status Register 4 ............................................................................................. 28

S92

Flash (!) / On Time .......................................................................................... 28

S86

Flash (!) / Off Time .......................................................................................... 28

S87

Accepted Answer Tone Frequencies .............................................................. 28

S120

Answer Tone Qualify Time .............................................................................. 29

S121

S29 Extended Result Code/ Cadence Stat us ................................................. 29

Configuration and Status Register 1 ............................................................... 30

S73

Dial Tone / Wait For Dial Tone Time ............................................................... 30

S66

Dial Tone / Qualify Dial Tone Time ................................................................. 30

S67

Dial Tone / Cadence A Minimum On Time ..................................................... 30

S35

Dial Tone / Cadence A Maximum On Time .................................................... 30

S36

S37 Dial Tone / Cadence A Minimum Off Time ..................................................... 31

Dial Tone / Cadence A Maximum Off Time .................................................... 31

S38

Dial Tone / Cadence B Minimum On Time ..................................................... 31

S39

Dial Tone / Cadence B Maximum On Time .................................................... 31

S40

Dial Tone / Cadence B Minimum Off Time ..................................................... 31

S41

Dial Tone / Cadence B Maximum Off Time .................................................... 31

S42

Busy Detection Cadence Cycle Count ............................................................ 32

S23

Busy Tone / Cadence A Minimum On Time .................................................... 32

S43

Busy Tone / Cadence A Maximum On Time ................................................... 32

S44

Busy Tone / Cadence A Minimum Off Time .................................................... 32

S45

Busy Tone / Cadence A Maximum Off Time ................................................... 32

S46

Busy Tone / Cadence B Minimum On Time .................................................... 32

S47

Busy Tone / Cadence B Maximum On Time ................................................... 33

S48

Busy Tone / Cadence B Minimum Off Time .................................................... 33

S49

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S50 Busy Tone / Cadence B Maximum Off Time ................................................... 33

Call Progress Selection ................................................................................... 33

S20

Imprecise Filter Selection ................................................................................ 33

S88

Precise Call Progress Selection ...................................................................... 34

S19

Precise Call Progress Detect .......................................................................... 34

S63

Pre Dial Call Progress Imprecise Detect Level ............................................... 35

S75

Post Dial Call Progress Imprecise Detect Level ............................................. 35

S76

Pre Dial Call Progress Precise Detect Level ................................................... 35

S77

Post Dial Call Progress Precise Detect Lev el ................................................. 36

S78

Calling Tone Off Time ..................................................................................... 36

S15

Calling Tone On Time ..................................................................................... 36

S16

Data Modulation Selection .............................................................................. 36

S30

Data Modulation Status ................................................................................... 37

S31

Wait Before Connect ....................................................................................... 37

S119

V23 Half Duplex Enable .................................................................................. 37

S124

Protocol Selection ........................................................................................... 38

S25

FSK Originate Carrier Detect Level ................................................................ 38

S79

FSK Answer Carrier Detect Level ................................................................... 38

S80

PSK Originate Carrier Detect Level ................................................................ 38

S81

PSK Answer Carrier Detect Level ................................................................... 39

S82

QAM Originate Carrier Detect Level ............................................................... 39

S83

QAM Answer Carrier Detect Level .................................................................. 39

S84

Inactivity Timeout ............................................................................................ 39

S117

Pre Call attempt delay ..................................................................................... 40

S105

Delay between 1

S106

Delay between N

S107

Maximum successive failed attempts ............................................................. 40

S108

Delay between series ...................................................................................... 41

S109

Software Ring Detect ...................................................................................... 41

S123

Ring / Minimum Frequency Detection ............................................................. 41

S17

Ring / Maximum Frequency Detection ............................................................ 42

S18

Ring / Cadence A Minimum On Time ............................................................. 42

S51

Ring / Cadence A Maximum On Time ............................................................ 42

S52

Ring / Cadence A Minimum Off Time ............................................................. 42

S53

Ring / Cadence A Maximum Off Time ............................................................ 42

S54

Ring / Cadence B Minimum On Time ............................................................. 42

S55

Ring / Cadence B Maximum On Time ............................................................ 43

S56

Ring / Cadence B Minimum Off Time ............................................................. 43

S57

Ring / Cadence B Maximum Off Time ............................................................ 43

S58

Billing Delay Time ........................................................................................... 43

S74

S95 Caller ID configuration ..................................................................................... 43

Caller ID Ring Interrupt Delay ......................................................................... 44

S118

Parallel Pick-up Energy Detection (Default=0) ............................................... 44

S89

Line-In-Use/Parallel Pick Up Configuration Regi st er ...................................... 44

S110

Line-In-Use Settling time ................................................................................. 45

S111

Line-In-Use Energy detection Wait ................................................................. 45

S112

Line-In-Use Energy Detection Threshold ........................................................ 45

S113

Parallel-Pick-Up Energy detection Threshold ................................................. 46

S116

Parallel Pick Up Debounce Timer ................................................................... 46

S122

General Modem Status Register 1 .................................................................. 46

S14

General Modem Status Register 2 .................................................................. 47

S21

General Modem Status Register 3 .................................................................. 48

S22

Data Mode Control Register ........................................................................... 48

S26

Call Progress Transmit Register ..................................................................... 49

S27

Fast Connect Status and Calling Tone Enable Register ................................ 50

S28

Test Control Register ...................................................................................... 50

S60

Signal detect Register 1 .................................................................................. 51

S61

Signal detect Register 2 .................................................................................. 51

S62

st

and 2

th

and N+1

nd

th

attempt .................................................................. 40

attempt ............................................................ 40

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S65 DTMF Detect Register .................................................................................... 52

Test Timer ....................................................................................................... 52

S68

Test Error Count .............................................................................................. 53

S69

Auto Retrain Threshold ................................................................................... 53

S70

RTS to CTS Turnaround Delay ....................................................................... 53

S90

Maximum carrier detect threshold (High Byte) ................................................ 53

S114

Maximum carrier detect threshold (Low Byte) ................................................ 53

S115

Application Notes for the TSC Softmodem ................................................................................ 54

2.3
Resetting the TSC Softmodem
Call Progress Detection
Built in Country Support
V23 Operation
Line in Use/Parallel Pick Up Detection Support
DTMF Tone Detection
SMS Applications
SMS Applications continued
SMS Applications continued

S-Register Index ...................................................................................................................... 66

3

Related Documentation .......................................................................................................... 68

4

Contact Information ................................................................................................................ 68

5
Revision History

...................................................................................... 55

................................................................................................. 55

................................................................................................. 58

................................................................................................................ 61

............................................................ 61

................................................................................................... 62

........................................................................................................... 63

.......................................................................................... 64

.......................................................................................... 65

................................................................................................................................ 69

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1 Introduction

The Teridian V.22BIS Softmodem is a V.22bis, V .22, V.23, V.21, Bell 212A, 103, and 202 modem
algorithm. It includes the signal processing functions as w el l as an “AT” command interpreter.

1.1 Use of this Document

It is assumed that the reader has basic familiarity with microprocessors, firmware and data
communications. Prior experience with modems is not assumed but would be useful.
This document presents all the features included i n the TSC V.22BIS Softmodem in terms of software.

1.2 Language and Terminology

To a large extent, telecommunications and, by extension, data communications, has developed a
terminology distinct from the rest of the e l ect ronics engineering community. The lack of worldwide
standards until recent years has also hampered the adoption of widely accepted terms. North A m erica,
dominated by the earlier influence of Bell Telephone, has developed terminology, which differs from that
now used by the ITU, the industry group respon sibl e for setting international standards. As international
data exchange grows in importance, the ITU can be expected to grow in influence, even in North
America. For that reason we have chosen to use t he ITU terminology in most cases. There will be some
exceptions to our use of ITU terms. For exampl e, "mark" (one) and "space" (zero) are much shorter t han
"binary one" and "binary zero" and these have been used where appropriate. Also, we may use Bell
terminology when discussing Bell specif i cat ions. The North American terminology is so pervas ive that it is
used by default in areas where the ITU has yet to venture.

1.3 Registered Trademarks

Throughout this manual, we wish to acknowledge the following: Hayes, Hayes AT, Smartcom and
Smartmodem are registered trademarks of Hay es M icrocomputer Products; IBM, IBM PC, IBM AT, and
PS/2 are registered trademarks of IBM; MNP i s a registered trademark of Microcom; Tri-state is a
registered trademark of National Semiconductor Corporation.

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Causes the modem to immediately go on-line (off-hook) in the Answer mode and attempt
to handshake regardless of the value of register S0. This command gives you a method of
manually answering an incoming phone call. For restrictions, see also the R command.

2 User Guide

The modem firmware supports a variation of the Hayes AT command set as its DTE interface.
Originating, answering and setting up the various options are performed by sending one or m ore AT
commands to the modem from the DTE. A brief desc ription of the AT command syntax and the AT
commands supported follows.

2.1 The AT Command Format

Instructions sent to the modem are referred as “AT commands” because they are always prece ded by a
prefix composed of the two characters “AT” t hat are used to get the “ATtention” of the modem.
Provided that the correct connections have been made (refer to the data sheet), the TSC Softmodem will
use those two characters to determine the transmission rate, the data length as well as the parity used by
the DTE. Most of the AT commands have selectable parameters and related values. Every AT comm and
will have the following format:

<AT><Command>{Argument}{=n}<Enter>

AT - Attention code
Command - A command consists of one letter
Argument - Optional information that further defines the command
=n - Used when setting a register

You may "string" commands together in one command line as long as the total length of the command
line does not exceed 63 bytes. The attention code, AT, is only required at the beginning of the command
line. If no argument is provided with a command that takes a numerical argument, an argumen t of zero is
assumed. For example, the following commands are identical:

ATH<Enter> or ATH0 <Enter>

NOTE: Information in "angle" brackets <> must be included as part of the command line, while
information in "curly" braces {} may or may not be necessary as part of the command line.

NOTE: the +++ and A/ commands are neither preceded by AT nor followed by <CR>.
The TSC Softmodem requires time before it is ready to accept another command after responding

with “OK”. When multiple AT commands are used back to back, the user must wait until after the
‘OK<Enter>_’ response from the modem from the previous command before the modem is ready
to take another command. This wait time should be a least 10 ms. All commands except “D ”, “A”,
and “O” return an “OK”.

The following description uses these convent i ons:

• All allowed parameters are shown.

•  specifies the default value when applicable.

A Answer

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execute the last command or command

A/ and +++AT are the only commands that are neither preceded by AT nor followed by

V23 Master or Slave

mode

V23 Slave or Master

mode

Turnaround phase

DCD

Active

Inactive

A/ Repeat Last Command

The A/ command causes the modem to re­sequence that was issued.

<Enter>.

B Communication Standard Selection

B0 ITU V22bis, V22 or V21 operation



B1 Bell 212A or Bell 103 operation (also V.22bis f or 2400 bps operation)
B2 V23 – 75bps transmission, 1200bps reception – Master mode
B3 V23 – 1200bps transmission, 75bps recept ion – Slave mode
B4 Bell 202 – 1200bps reception
B5 Bell 202 – 1200bps transmission
B6 V23 4-Wire – 1200bps receive and transmit
B7 V23 4-Wire – 1200bps receive and transmit (same as B6)
B8 Bell 202 4-Wire – 1200bps receive and transmit
B9 Bell 202 4-Wire – 1200bps receive and transmit (same as B8)

B10 Selects 1200 bps V.23 Half duplex mode ( V23 H). B10 and B11 are the same
B11 Selects 1200 bps V.23 Half duplex mode ( V23H) . B10 and B11 ar e the same.

C Data Carrier Detect Signal (DCD) Monitoring


C1 DCD ON in presence of qualified carrier signal
C2 DCD ON in presence of raw carrier signal

During V23 turnaround phases, the DCD signal is OFF if C1 or C2 options selected

C0 DCD always ON

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This command puts the modem into originate mode and instructs the modem to dial the
phone number expressed by the string argument n...n. The number will be dialed with
either tones or pulses depending on how the last number was dialed. On power up, this

e dialing. (See the note in DT[n...n] command.) The allowable

arguments for n...n differ for pulse and tone dialing; see the descriptions under DT[n...n]

P

R

Modem uses answer mode frequencies after dialing the number. Allows dialing
up an originate-only modem. Busy detect is disabl ed during reverse dial.

T

;

A “;” (semicolon) causes the modem to go back into the Command State,

line. To do this, the semicolon

must be the last character in the command line.

,

When inserted in a dialing string, a “,” (comma) causes the modem to pause.
The default time for the pause is two seconds, and can be changed by

@

A @ (commercial "at" symbol) causes the modem to wait up to 30 seconds for

tect the
end of a prerecorded message. The default wait time is 30 seconds, and can
be changed by modifying register S7. Result Codes 7 and 8 will be reported
regardless of which Result Code Set is selected.

!

An ! (exclamation mark) causes a "hook flash." This simulates hanging up for
1/2 second and then reconnecting. It i s typi call y used for transferring calls.

W

Causes the modem to wait for a dial tone for a specified length of time before

by modifying
register S66. Result Code 6 will always be included regardless which Result
Code Set is selected.

S

J

Replace the current active configuration with the factory standard configuration stored in
memory

D Dial

n
n A-D, *, # are only allowed during Tone dialing.

command will default to puls
and DP[n...n].

0-9 digit

Dial String Modifiers

Pulse dial the digits that follow.

Tone dial the digits that follow.

allowing you to enter other commands while on-

modifying register S8.
a 5 second period of quiet before proceeding. This is often used to de

proceeding. The default is 8 seconds, and can be changed

S-register modification. See S[r]=[n] comm and.
PTT Test. See J[n] command.

E Echo Command

E0 Command echo disabled



E1 Command echo enabled

F Load Factory default Configuration

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Analog Interface Test Mode: Loops back the TXAP-TXAN signal to RXA
through external components to check if everything is wired correctly. Returns

Goes off-hook and wait for CAS tone. If a CAS is detected, send an ack and

detect a US CID .

ernate (preferred) method of detecting DTMF tones is available though usage of the
Caller ID DTMF detection mode. Refer to DTMF tones detection chapter at the end of this
document.

G Guard Tone Selection


G1 550Hz guard tone enabled
G2 1800Hz guard tone enabled

G0

No guard tone

H Hook Control



H1 Off-hook (connect to phone l i ne)

H0

On-hook (hang up)

I Identification

I0
I3 Returns firmware revision number
I4 Returns copyright notice

Returns TSC Softmodem information

Returns product identification code

J PTT t est

J0
J1 Transmit DTMF tones specified by registers S12 and S13
J2 Transmit Answer ton e or Calling tone specified by register S13 and S27
J3 Transmit modulati on specified by registers S14, S30 and S60
J4 Transmit silence (quiet m ode)
J5 Wait (To set up the wait time use J5.[n]. [n] is in 1/10 ms)
J6 Detect CAS and DTMF tones off hook(requires host polling of register S65)*

J7

J8

*An alt

Stop J test in progress

OK, or ERROR. Signal Levels are specified wit h S113, S114-S115.

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is turned inactive as soon as at least 15 bytes are in the 32

status is only acknowledged by the TSC Softmodem, thus starting or stopping data

transmission to the DTE, if data are received by the DCE. Receive Data is not buffered by

DSR

N0

N1

circuit is turned ON

up process

N2

circuit is turned ON

is

K DTE-DCE Flow Control



K3 RTS/CTS flow control (hardware flow control)
K4 Xon/Xoff control (software flow control)

K0

In Asynchronous mode, CTS
byte transmit buffer. CTS is turned back active when less than 4 bytes are in the buffer.
RTS

the TSC Softmodem.

Flow control disabled

L Fast Connect



L1 Disable 2100 Hz answer tone and billing delay
L2 2 second billing delay enabled with no 2100 Hz answer tone
L3 400 ms answer tone and billing delay enabled

L0

Disable Fast Connect

N Data Set Ready (



DSR always ON
DSR is OFF in the idle state and when in a test mode. DSR

at start of the handshaking process. DSR is turned OFF when hang­is started.

DSR is OFF in the idle state and when in a test mode. DSR
at the end of handshake after issuing the “CONNECT” result code. DSR
turned OFF when hang-up process is started.

) signal Monitoring

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V22bis

connection

Carrier...

result

V42

detection

Prot./connect

..

result

Data

mode

DCD

DSR

V22bis

connection

V42

detection

connect.. result

Data

mode

DCD

DSR

V22bis

connection

V42

detection

Data

mode

DCD

DSR

V22bis

connection

Carrier...

result

Prot./connect..

result

Data

mode

DCD

DSR

V22bis

connection

Data

mode

DCD

DSR

If you have returned to Command state from Data state without breaking a
connection, the O0 command will return you on-line (Data stat e)

Similar to O0, but also causes the modem to initiate an equalizer retrain
sequence

The following shows the actions of DCD and DSR as viewed at the RS232 connect or (inverted from pins)
during the connection process under different conditions.

1) Mode V22bis, Protocol enable d (through S25), Extended result co des.

2) Mode V22bis, Protocol enable d (through S25), Normal result codes.

3) Mode V22bis, Protocol enable d (through S25), No result codes.

4) Mode V22bis, No Protocol, Extended result codes.

5) Mode V22bis, No Protocol, No result codes.

O On-Line



O1
O2 Enables the modem to respond to a remote request for retrain

O3 Disables the modem to respond to a remote request for retrain
O4 Enables speed negotiation
O5 Disables speed negotiation

12 Rev. 1.5

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The O[n] command is used to go back on-line when the command state was entered by

Note: If commands O0 or O1 are given to the modem while not connected, it will respond
with ERROR.

Causes the modem to pulse dial.

conjunction with the dial command, or alone, to designate

the method used for subsequent dialing.

DTR

Modem goes on-hook (hangs up), disables the Auto Answer mode, and

transitions from ON to OFF.

Turning

back ON will enable auto-Answer mode.

Enable V.23 Turnaround in Master Mode (On to Off

transition starts the

turnaround). Turnaround is done via

in all other R command settings.

The R[n] command selects how the Data Terminal Ready (

) signal is used by the

modem.

O6 Enables rate change to 1200 bps
O7 Enables rate change to 2400 bps

issuing the +++ escape sequence or turning DTR from ON to OFF with the appropriated S­Register setting in effect. The O[n] command applies only to asynchronous operation.

P Pulse Dial

The P modifier can be issued in

Q Result Codes Control



Q1 Result codes disabled

Refer also to the V[n] and X[n] commands.

Q0

Result codes enabled

R Data Terminal Ready (



R1 Modem assumes the Command State when DTR transitions from ON to OFF

R2

R3 Modem is reset when DTR transitions from ON to OFF
R4
R5 Power Down with DTR toggle (need hard reset)

R0 Modem ignores DTR

assumes the Command State when DTR

DTR

) Action

DTR

RTS

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S[r]?

The S[r]? command requests the modem to report the current value

These registers are used to set up various operating
parameters of the modem as explained in Chapter 5. The value
reported is in decimal notation.

S[r]$

The S[r]$ command requests the modem to report the current value
of register [r]. The value reported is in hexadecimal notation.

S[r]???

The S[r]???… command requests the modem to report the current
value of [r] and successive registers. The values are reported in
decimal notation. The number of registers reported corresponds to

? (question marks) given to the modem. For an
example: S10??? will report the values stored in the registers S10,
S11, S12.

S[r]$$$

The S[r]$$$… command requests the modem to report the current

rted in
hexadecimal notation. The number of registers reported
corresponds to the number of $ (dollar signs) given to the modem.
For an example: S10$$$ will report the values sto red in the registers
S10, S11, S12.

S[r]=[n]

S[r]=[n] Set S-Register Value r = 0 to 104 n = 0 to 255
The S[r]=[n] command allows you to set (modify) the value of any of
register [r] to new value [n]. The value [n] is entered in decimal
notation.

S[r]=n.$n.n.$n…

The S[r]=n.$n.n.$n… command allows you to set (modify) the value
of any of [r] and successive registers to the new values n (decimal
notation) or $n (hexadecimal notation). For an example:
S10=$F0.128.$EC.25 will set register S10=F0 (hexadecimal),
S11=128 (decimal), S12=EC (hexadecimal), and S13=15 (decimal).

l hexadecimal values must be entered in as a two digit hex value. For

example enter $0A instead of $A.

S[r]+[n]

The S[r]+[n] command sets bits in [r] S register by ORing the [n]
value and the value currently in the S Register.

S[r]-[n]

The S[r]+[n] command clears bits in [r] S register by ANDing the [not
n] value and the value currently in the S Register. All bits set in the
mask [n] will be cleared in the S register.

Causes the modem to tone dial.

conjunction with the dial command, or alone, to designate

the method used for subsequent dialing.

S S Register Monitoring

of register [r].

the number of

value of [r] and successive registers. The values are repo

T Tone Dial

The T modifier can be issued in

Al

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Y0

Asynchronous mode. No speed buffering, no prot ocol.

Y1

Synchronous mode. No speed buffering, no protocol.

Y4

Quasi-Synchronous mode. Allows the transmis sion and reception of

Y6

Asynchronous with speed buffering. Allows fix ed DTE-DCE speed so
connection results.

V Verbose/Numeric Result Codes Selection

V0 Numeric result codes – Format <CR>digit(s)<CR>



V2 Numeric result codes - Format <CR><LF>digit( s)<CR><LF>

Refer also to the Q[n] and X[n] commands

V1 Verbose result codes – Format <CR><LF>word< CR><LF>

Y Asynchronous/Synchronous Mode Selection



synchronous data through an asynchronous DTE by stripping off start and stop
bits on transmission and adding them on reception (See V42 operation).

applications do not need to change the communications rate based on

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W0

Do not return extended result codes (40-80). The message CONNECT followed
by the data rate between the DTE and the modem wi ll be sent to the DTE

W1

The CONNECT message will report the DTE speed then enable the carrier and
extended result codes

W2

The CONNECT message will report the DCE speed. All extended result codes
are disabled

W Extended Result Codes Selection



0 OK 13 CONNECT 7200
1 CONNECT 14 LINE-IN-USE
2 RING 22 CONNECT 75/1200
3 NO CARRIER 23 CONNECT 1200/75
4 ERROR
5 CONNECT 1200 40 CARRIER 300
6 NO DIALTONE 41 CARRIER 600
7 BUSY 44 CARRIER 1200/75
8 NO ANSWER 45 CARRIER 75/1200
9 CONNECT 600 46 CARRIER 1200
10 CONNECT 2400 47 CARRIER 2400
11 CONNECT 4800 70 PROTOCOL:NONE

Result codes

Numeric

value

Verbose

value

Numeric

value

Verbose

value

Extended Results Codes:

12 CONNECT 9600 77 PROTOCOL:LAP-M

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14

+ ext.

0, 2, 4, 6, 14

0, 2, 4, 6, 14 +

0, 2, 4, 6, 14

0 – 1, 3 – 5,

0–1, 3–5,

+ ext.

0–1, 3–5,

0, 2 – 4, 14

0, 2 – 4, 14

0, 2 – 4, 14

0 – 1, 3 – 5, 7,

0–1, 3–5, 7,

+ ext.

0–1, 3–5, 7, 9-

0, 2, 4, 6, 14

0, 2, 4, 6, 14 +

0, 2, 4, 6, 14

0 – 1, 3 – 5, 7,

0–1, 3–5, 7,

+ ext.

0–1, 3–5, 7,

0, 2 – 4, 7, 14

0, 2 – 4, 7, 14

0, 2 – 4, 7, 14

0 – 1, 3 – 5,

0–1, 3–5, 9–

+ ext.

0–1, 3–5,

0, 2, 4, 6 - 7,

0, 2, 4, 6 - 7,

0, 2, 4, 6 - 7,

0 – 1, 3 – 5,

0–1, 3–5, 9–

0–1, 3–5,

0, 2 – 4, 7, 14

0, 2 – 4, 7, 14

0, 2 – 4, 7, 14

0 – 1, 3 – 5, 7,

0–1, 3–5, 7,

0–1, 3–5, 7, 9-

0, 2, 4, 6 - 7,

0, 2, 4, 6 - 7,

0, 2, 4, 6 - 7,

0 – 1, 3 – 5, 7,

0–1, 3–5, 7,

0–1, 3–5, 7, 9-

X Result Codes Set and Dialing Capabilities Selection

X0 Enable Result Codes 0-4, 14
X1 Enable Result Codes 0-5, 10-14
X2 Enable Result Codes 0-6, 10-14
X3 Enable Result Codes 0-5, 7, 10-14



X4 Enable Result Codes 0-7, 10-14
X5 Enable Result Codes 0-5, 10-14 and detect BUSY at OF F HOOK
X6 Enable Result Codes 0-6, 10-14 and detect BUSY at OF F HOOK
X7 Enable Result Codes 0-5, 7, 10-14 and detect BUSY at OF F HOOK
X8 Enable Result Codes 0-7, 10-14 and detect BUSY at OFF HOOK

See Result Codes table under W command.

X0

X1

X2

X3

X4

W0 W1 W2 W0 W1 W2

0, 2 – 4, 14 0, 2 – 4, 14 0, 2 – 4, 14 0 – 1, 3 – 4,
0, 2 – 4, 14 0, 2 – 4, 14

Pre Dial Post Dial

0–1, 3–4, 14 0–1, 3–4, 14

+ ext.

ext.

+ ext.

ext.

0, 2 – 4, 14 0 – 1, 3 – 5,

9 – 14, 22, 23

9 - 14, 22, 23

9 - 14, 22, 23

9 - 14, 22, 23

0–1, 3–5,

9–14, 22, 23

9–14, 22, 23

9–14, 22, 23

9–14, 22, 23

0–1, 3–5,

9-14, 22, 23

9-14, 22, 23

4, 22, 23

9–14, 22, 23

X5

X6

X7

X8

14

14

+ ext.

14 + ext.

+ ext.

14 + ext.

14

14

9 - 14, 22, 23

9 - 14, 22, 23

9 - 14, 22, 23

9 - 14, 22, 23

14, 22, 23

14, 22, 23

+ ext.

9–14, 22, 23

+ ext.

9–14, 22, 23

+ ext.

9-14, 22, 23

9-14, 22, 23

14, 22, 23

14, 22, 23

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Y0

Asynchronous mode. No speed buffering, no prot ocol.

Y1

Synchronous mode. No speed buffering, no protocol.

Y4

Quasi-Synchronous mode. Allows the transmis sion and reception of
bits on transmission and adding them on reception (See V42 operation).

connection results.

The Z command resets the modem. The Z command is equivalent to a power cycle.
Additional commands are not allowed in the command string.

The @C[r]=[n] command allows you to set (modify) the

or hexadecimal($ prefix) notation.

The @C[r]=n.$n.n.$n… command allows y ou to set

$0A instead of $A.

Register.

the Register.

the register.

Y Asynchronous/Synchronous Mode Selection

Y6 Asynchronous with speed buffering. Allows fix ed DTE-DCE speed so



synchronous data through an asynchronous DTE by stripping off start and stop

applications do not need to change the communications rate based on

Z Reset

@C Configure Registers

The @C command modifies the MicroDAA register value.

@C[r]=[n], Set Register Value r =
0 to 31($1F), n = 0 to 255($FF)

value of any of MicroDAA register [r] to new value [n].
The value [n] and [r] can be either in decimal(n o prefix)

@C[r]=n.$n.n.$n… command
allows you to set (modify) the
value of any of [r] and successive
registers to the new values n
(decimal) or $n (hexadecimal).

@C[r]+[n] command sets bits in
[r] register by ORing the [n] value
and the value currently in the

@C[r]-[n] command clears bits in
[r] register by ANDing the [not n]
value and the value currently in

@D Dump Registers

The @D command dumps entire MicroDAA registers.

(modify) the value of any of [r] and successive registers
to the new values n (decimal) or $n (hexadecimal). For
an example: @C$10=$0F.128.$EC.25 will set Register
$10=$F0, Register $11=128 (decimal), Register
$12=$EC and S13=15 (decimal).

must be entered in as a two digit hex value. For example enter

The @C[r]+[n] command sets bits in [r] regi st er by
ORing the [n] value and the value currentl y in the
Register.

The @C[r]-[n] command clears bits in [r] register by
ANDing the [not n] value and the value currentl y in the
Register. All bits set in the mask [n] will be cleared in

All hexadecimal values

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Terminates the softmodem application gracefully and goes to Linux prompt.
root directory.

During a data connection, the escape command (+++) returns you to Command state

terminating the data connection so you can enter AT commands. The TSC
Softmodem supports the TIES (Timing Independent Escape Sequence) escape, not the
patented Hayes escape. The +++ must be followed by a valid AT command for the escape

AT command follows the +++, the modem will return to the data

line

command state.

@L[n] Set Lease Line Operation

Lease line operation is des ignated by S89 bit 2

n = 1 Sets lease line bit
n = 0 Clears lease line bit

@Z Escape to OS

To return to Softmodem application from t he li nux prompt, type “tsc_1922_CRLF” from the

+++ Escape Sequence

without

to be recognized. If a non­mode. Giving the TSC Softmodem a “+++AT” is also valid for escaping to the on-

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2.2 S-Registers

2.2.1 S-Register Overview

The S register set found in the TSC Softmodem is modeled after the Hayes S-registers, but differ in m any
respects. The Hayes register set has evolv ed over time to support added features, and the TSC
Softmodem has many features not found in ot her m odems. As is true for the AT commands, the Hayes
format is loosely followed, but it should not be assumed that software driver configurations written for
another modem will work without some modificati ons. Closely examine the register set and assure the
commands sent to the TSC Softmodem will giv e the intended actions.

The S-Registers allow you to customize the modem's operation. For example, you can use S-Registers
to determine how many times the telephone will ring before the modem answers, how long the modem
will wait for a dial tone before aborting a dialing sequ ence, how long the modem will pause during a
"pause" command, and so on. S-Registers are chang ed with the S[r]=[n] command.

You can check your S-Register settings any time you are in Command State. To check an S-Register
setting, enter a command consisting of the S-Register you want to check followed by a question mark.
For example, to check how long the modem will wait for a di al tone before aborting a call, type in the
following command:

AT S6? <Enter>
The screen will display the current settin g of S-Register S6.
To change an S-Register setting, enter a command consisting of the S-Register, an equal (=) sign, and

the desired value (in decimal). For example, t o set the modem to answer after three rings, type the
following command:

AT S0=3 <Enter>
Note: For more details on the commands to check or modify S-Registers see the S command under the

paragraph “AT” command set.

List Of S-Registers
The S-Registers you can change with the S[r] =[ n] command, or whose value you can check with the S[r]?
command, are listed below:

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This register specifies the ring on which the modem will answer. A value of 1 to 255 will

answer mode and cause it to answer on that many rings

detected.

When the modem is set for Auto-Answer, register S1 keeps track of the number of times

on time, the S1 register is reset to 0 after the sum of

S56 and S58 seconds has elapsed.

2.2.1.1 TR30.2-Style Contr ol and Status Registers

S0 Auto Answer

n 0 –255



1-255 Auto answer mode on selected number of rings

0 Auto answer disabled

place the modem in auto-

S1 Ring Count

n 0 –255



0 No valid rings detected

the phone rings. After the end of ring-

S2 Escape Code Character

n 0 – 127 (ASCII)



>127 Escape feature disabled

43 ASCII “+”

S3 Carriage Return Character

n 0 – 127 (ASCII)



This character terminates both the command line and the result codes.

Rev. 1.5 21

13 <CR>