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S-Registers
Floyd
Kling
Modem configurations are stored
in S-Registers. Each S-Register is an 8 bit
register capable of storing a decimal value
between 0 and 255. Some S-Registers may not be
changeable or assessable to the user.
-
The 'S=' command is used to
directly modify the S-Register contents in
the form of :
ATSn=x<cr>
Sn
Establishes S-register "n" as the last
register accessed.
Sn= v
Sets S-register "n" to the value "v"
Sn?
Reports the value of S-register "n".
The parameter
n can be omitted, in which case the
last S-Register accessed will be assumed.
The S can be omitted for the AT=<cr> and
AT?<cr> in which case the last S-Register
accessed will be assumed.
Inputs and outputs are always in decimal
format. If the parameter n or
v is outside the valid range, the modem
will return ERROR.
Note: In some cases writing
to the S register may appear to be
accepted but the value will not actually
be written, also some S-Parameters are
read-only.
In order to avoid confusion, the
S-Registers are separated into two types;
regular and bit mapped.
The regular type is fairly
easy to understand while the bit mapped
type should be left to experienced personnel.
Some S-Registers share functionality with AT
commands. i.e changing the an 'AT' parameter
will automatically change the shared S-Register,
and visa versa. In those cases only the AT
Command is documented herein. The corresponding
S-register is designated as 'bit mapped' or
'reserved'
S0
Rings count before Auto Answer
Determines modems auto answer
function. A value of 0 disables the auto answer.
A value of n greater than 0 will automatically
answer after n rings. Zero (0) will disable auto
answer.
Default: 0 (for most modems)
Range: 0-255
Rings
Saved In &W:
Yes
S1
Ring count
Counts the number of detected
rings . It is cleared to zero if no rings are
detected over an 8-second interval. This is a
read-only register.
Default: 0
Range: 0-255 Rings
Saved In &W: NA
S2
Escape Character
Contains the decimal value
of the ASCII character used for the escape
character (well known as +++)
Default: 43 (+..plus sign)
Range: 0-255
Saved In &W: Yes
S3
Carriage return <cr> character
Contains the decimal value of the
ASCII character for the carriage return
character
Default: 13 <cr>
Range: 0-127
Saved In &W: No
S4
Line Feed Character
Contains the decimal value of the
ASCII character used for the line-feed
character:
Default: 10 (line feed)
Range: 0-127
Saved In &W: No
S5
Back Space Character
Contains the decimal value of the
ASCII character used for the back space
character
Default: 8 (backspace)
Range: 0-255
Saved In &W: No
S6
Wait Before Dialing
Contains the value (in seconds)
that determines the time the modem must wait
before dialing.
Default: 2 (seconds)
Range: 2-255
seconds
Saved In &W: yes
S7
Wait For Carrier
Contains the number of seconds
the modem will wait for carrier in both the
answer and originate modes. If no carrier is
detected by this time setting, the modem will
hang-up and return to IDLE mode. This value is
country dependent.
Default: 50 (seconds)
Range: 1-255
Saved In &W: Yes
S8
Pause
Designates the pause time in
seconds for each (,)comma encountered in the
dial string.
Default: 2 (seconds)
Range: 0-255
Saved In &W:
S9
DCD (Carrier Detect) Response Time
Designates the carrier detect
response time. Measured in tenths of a second.
Default: 6 (0.6 seconds)
Default:6 (.6
seconds)
Range: 1-255
(0.1sec increments)
Saved In &W: Yes
S10
Delay Between Loss of Carrier and Hang-Up
Contains the value that
establishes the delay time, in tenths of second,
between the loss of carrier (DCD changing to
low) and modem hanging-up.
Default: 14 (1.4 seconds)
Range: 1-255 (0.1
sec increments)
Saved In &W: Yes
S11
DTMF Duration and Spacing
Contains the value representing
the duration and
inter-digit time, in milliseconds, for DTMF
tones generated by the modem during tone
dialing. This value is country dependent.
Default: 95 (ms) (That's
95ms tone "on", followed by 95ms tone "off")
Range: 50-255
(0.001ms increments)
Saved In &W: Yes
S12
Escape Prompt Delay
Defines the maximum period, in
1/50 of a second, allowed between receipt of the
last character of the escape character sequence
and returning an "OK". If any characters are
detected during this time, the OK will not be
returned. Sending of the OK does not affect
entry into the command mode.
Default: 50 (1 second)
Range: 0-255
(0.02s increments)
Saved In &W: Yes
S13
Reserved
S14
Bit Mapped with various AT Commands (En, Qn, Vn
T, P)
Default: 138 (8Ah)
Range:
Saved In &W:
S16
Bit Mapped with Test commands (&T)
Default: 0
Range:
Saved In &W:
S17
Reserved
Default: 0
Range:
Saved In &W:
S18
Reserved
Default: 0
Range:
Saved In &W:
S19
Reserved
Default: 0
Range:
Saved In &W:
S20
Reserved
Default: 0
Range:
Saved In &W:
S21
Bit Mapped with various AT commands (&Rn, &Dn, &Cn,
&Sn, Yn)
Default: 52 (34h)
Range:
Saved In &W:
S22
Bit Mapped with various AT commands (Ln, Mn, Xn)
Default: 117 (75h)
Range:
Saved In &W:
S23
Bit Mapped with various AT commands (&Gn)
Default: 0
Range:
Saved In &W:
S24
Sleep Inactivity Timer.
Contains the length of time, in
seconds, that the modem will operate in normal
mode with no DTE activity before entering
low-power sleep mode. Timer is reset upon any
activity on the DTE interface. If S24=0 this
timer is disabled. This feature is not available
on all models
Default: 0 (Seconds)
Range: 0-255
Saved In &W:
S25
Delay Between Loss of DTR and Hang-up
Determines the delay time between
the loss of DTR and hang-up. The value of this
register differs depending on the operation in
effect: In Synchronous mode, when configured for
&M1, this time is measured in seconds; when
configured for &M2 or &M3, this delay is
measured in hundredths of a second.
Default : 5 (.05 sec
when in Async mode) -or- (5 sec when in
Synchronous Mode)
Range: 0-255
Saved In &W:
S26
Delay between RTS and CTS
Determines the period of time the
modem waits before turn on Clear To Send (CTS)
after detecting Request to Send (RTS). Measured
in hundredths of a second.
Default: 1 (0.01 seconds)
Range: 0-255 (in
0.01 sec increments)
Saved In &W:
S27
Bit Mapped with various AT commands (&Mn, &Ln,
&Xn, &Bn)
Default: 73 (49h)
Range:
Saved In &W:
S28
Bit Mapped with various AT commands (&Pn
Default: 0
Range:
Saved In &W:
S29
Hook Flash Dial Modifier Time
Sets the length of time in units
of 10ms, that the modem will go on hook when it
encounters the flash (!) dial modifier in the
dial string. The time can be limited as it is a
country dependent parameter.
Default: 70 (700ms)
Range: 0-255 (in
10ms increments)
Saved In &W:
S30
Disconnect Inactivity Timer
Set the time, in tenths of
seconds, that the modem will stay on line before
disconnecting when no data is sent or received.
(Dead man on keyboard). In error correction
mode, any data sent or received will reset the
timer. In other modes, any data sent will reset
the timer. Timer is disabled in synchronous
modes.
Default: 0 (disabled)
Range: 0-255 (in
10 second increments)
Saved In &W:
S31
Bit Mapped with various AT commands (\Vn, Wn,
#CID)
Default: 192 (C0h)
Range:
Saved In &W:
S36
LAP-M Failure
Control
Determines how the modem should react to a
LAP-M failure. The fallback options are
initiated immediatly upon connection if
S48=128. If an invalid number is
entered, the number is accepted into the
reguster, but S36 will act as if the default
value(7) has been entered
Default: 7
Range:
Saved In &W: Yes
BITS 0-2
0: Modem
disconnects
1: Modem
stays on-line and a direct modem connection is
established
2: Reserved
3: Modem
stays on-line and a normal modem connection is
established
4: An MNP
connetion is attempted and if it fails, the
modem disconnects
5: An MNP
connectin is attempted and if it fails, a direct
mode connection is established.
6: Reserved
7: An MNP
connection is attempted and if it fails, a
normal mode connection is established (DEFAULT)
S38
Delay before forced Hang up.
Specifies the delay between the
modems receipt of the H command to disconnect or
ON to OFF transition of DTR Applicable to
error-correction connections only. This register
can be used to ensure that data in the modem
buffer is sent before the modem disconnects.
Default: 20
Range: 0-255 (in
seconds increments)
Saved In &W:
S39
Bit Mapped with Flow control options (&Kn)
Default: 3
Range:
Saved In &W:
S40
Bit Mapped with MNP and break handling (-Kn,
\Kn)
Default: 104 (68h)
Range:
Saved In &W: Yes
S41
Bit mapped with Compression retrain, and
fallback. (%C, %E)
Default: 195 (C3h)
Range:
Saved In &W: Yes
S46
Data Compression Control
S46
controls selection of compression. The
following actions are executed for the given
values
136: Execute
error correction protocol with no compression.
138:
Execute error correction protocol with
compression DEFAULT
Default: 138
Range: 136 or 138
Saved In &W: Yes
S48
V.42 negotiation action
The S48
register controls V.42 negotiation
0:
Disable negotiation and proceeds with :AP-M
7:
Enable negotiation. DEFAULT
128:
Disables negotiation and proceeds with the
fallbck action specified by S36
Default: 7
Range: 0, 7, or
128 If an invalid number is entered, it is
accepted into the S-Parameter, but S48 will act
as if 128 has been entered
Saved In &W:
S86
Call failure Reason Code
When the modem fails to connect a
corresponding value is written to this register
that indicates the reason for failure. This
register helps determine the reason for the
failed connection of a previous call.
(To inspect
this register, enter
ATS86?<cr>)
Default: 21
Range: 0-26 (for
Inspection Only)
Saved In &W:
0 - Normal hang up, no error
occurred
1 - reserved
2 - reserved
3 - Call Waiting caused
disconnect
4 - Physical carrier loss
5 - No error correction at other
end
6 - No response to feature
negotiation.
7 - This modem is async only; the
remote modem is sync only
8 - No framing technique in
common
9 - No protocol in common
10 - Bad response to feature
negotiation
11 - No sync information from the
remote modem
12 - Normal hangup initiated by
the remote modem
13 - Retransmission limit reached
14 - Protocol violation occurred
15 - Lost DTR
16 - Received GSTN cleardown
17 - Inactivity timeout
18 - Speed not supported
19 - Long space disconnect
20 - Key abort disconnect
21 - Clears previous disconnect
reason
22 - No connection established
23 - Disconnect after three
retrains
24 - Call waiting tone detected
25 - Extension pickup detected
26 - Remote hangup detected
S91
PSTN Transmit Attenuation Level
Default: 10 (Country Dependent)
Range: 0-15 (in
dbm)
Saved In &W:
S92
Bit mapped with FAX control
Default: 10 (Country Dependent)
Range: 0-15 (in
dbm)
Saved In &W:
S95
Extended Result Codes Control (Bit Mapped)
Default: 0
Range:
Saved In &W:
S210
V.34 Symbol Rates (Bit Mapped)
Default: 13 (0Dh)
Range: 0-255
Saved In &W:
END
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