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Rockwell S Register definitions

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Register

Name

Default

Range

Description
S0 Number of Rings to Auto-Answer. 0 0 - 255 Sets the number of the rings required before the the modem automatically answers a call. Setting this register to zero disables auto-answer mode.
S1 Ring Counter 0 0 - 255 S1 is incremented each time the modem detects a ring signal on the telephone line. S1 is cleared if no rings occur over an eight second interval.
S2 Escape Character 43 (+) 0 - 255, ASCII decimal S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to an ASCII '+'. A value over 127 disables the escape process, i.e., no escape character will be recognized.
S3 Carriage Return Character 13 (Carriage Return) 0 - 127, ASCII decimal Sets the command line and result code terminator character. Pertains to asynchronous operation only.
S4 Line Feed Character 10 (Line Feed) 0 - 127, ASCII decimal Sets the character recognized as a line feed. Pertains to asynchronous operation only. The Line Feed control character is output after the Carriage Return control character if verbose result codes are used.
S5 Backspace Character 8 (Backspace) 0 - 127, ASCII decimal Sets the character recognized as a backspace. Pertains to asynchronous operation only. The modem will not recognize the Backspace character if it is set to a value that is greater than 32 ASCII. This character can be used to edit a command line. When the echo command is enabled, the modem echoes back the local DTE the Backspace character, an ASCII space character and a second Backspace character; this means a total of three characters are transmitted each time the modem processes the Backspace character.
S6 Wait Time for Dial Tone Before Blind Dialing, or After W Dial Modifier (W-Class Models) 2 2 - 255 seconds
  1. Sets the length of time, in seconds, that the modem will wait before starting to dial after going off-hook when blind dialing. This operation, however, may be affected by some ATX options according to country restrictions. The Wait for Dial Tone call progress feature (W dial modifier in the dial string) will override the value register S6.
  2. For W-class models, S6 sets the length of time, in seconds, that the modem will wait for dial tone when encountering a W dial modifier before returning NO DIAL TONE result code.

The modem always pauses for a minimum of 2 seconds, even if the value of S6 is less than 2 seconds.
S7 Wait Time For Carrier After Dial, For Silence, or For Dial Tone After W Dial Modifier (US Models) 50 1 - 255 seconds
  1. Sets the length of time, in seconds, that the modem will wait for carrier before hanging up. The timer is started when the modem finishes dialing (originate), or 2 seconds after going off-hook (answer). In originate mode, the timer is reset upon detection of answer tone if allowed by country restrictions.
  2. Sets the length of time, in seconds, that modem will wait for silence when encountering the @ dial modifier before continuing with the next dial string parameter.
  3. For US models, S7 sets the length of time, in seconds, that the modem will wait for dial tone when encountering a W dial modifier before continuing with the next dial string parameter.
S8 Pause Time For Dial Delay 2 0 - 255 seconds Sets the time, in seconds, that the modem must pause when the , dial modifier is encountered in the dial string.
S9 Carrier Detect Response Time 6
(0.6 second)		 1 - 255 tenth of a second Sets the time, in tenth of a second, that the carrier must be present before the modem considers it valid and turn on RLSD. As this time is increased, there is less chance to detect a false carrier due to noise from the telephone line.
S10 Lost Carrier To Hang Up Delay 14
(1.4 seconds)		 1 - 255 tenth of a second Sets the length of time, in tenth of a second, that the modem waits before hanging up after a loss of carrier. This allows for a temporary carrier loss without causing the local modem to disconnect. When register S10 is set to 255, the modem functions as if a carrier is always present.

The actual interval the modem waits before disconnecting is the value in register S10 minus the value in the register S9. Therefore, the S10 value must be greater than the S9 value or else the modem disconnects before if recognize the carrier.
S11 DTMF Tone Duration 95
(95 milliseconds)		 50 - 255 milliseconds Set the duration of tones in DTMF dialing (US models only). This value has no effect on pulse dialing.
For W-class models, this parameter is a country parameter loaded by ConfigurACE.
S12 Escape Prompt Delay (EPD) 50
(1 second)		 0 - 255 1/50 of a second Defines the maximum period, in fiftieths of a second, allowed between receipt of the last character of the three escape character sequence from the DTE and sending of the OK result code to DTE. If any characters are detected during this time, the OK will not be sent. Note that sending of the OK result code does not affect entry into command mode.
S13 Reserved
S14 General Bit Mapped Option Status 138 (8Ah) (10001010b) - Indicates the status of command options.
Bit 0 This Bit is ignored.
Bit 1 Command echo (En)
0 (E0) - Disabled
1 (E1) - Enabled (default)
Bit 2 Quiet mode (Qn)
0 (Q0) - Send result codes (default)
1 (Q1) - Do not send result code
Bit 3 Result codes (Vn)
0 (V0) - Numeric
1 (V1) - Verbose (default)
Bit 4 Reserved
Bit 5 Tone (T) / Pulse (P)
0 (T) - Tone (default)
1 (P) - Pulse
Bit 6 Reserved
Bit 7 Originate / Answer
0 - Answer
1 - Originate (default)
S15 Reserved
S16 General Bit Mapped Test Options Status 0 - Indicates the test in progress status.
Bit 0 Local analog loopback
0 - Disabled (default)
1 - Enabled (&T1)
Bit 1 Not used
Bit 2 Local digital loopback
0 - Disabled (default)
1 - Enabled (&T3)
Bit 3 Remote digital loopback (RDL) status
0 - Modem not in RDL (default)
1 - RDL in progress
Bit 4 RDL requested (&T6)
0 - RDL not requested (default)
0 - RDL requested (&T6)
Bit 5 RDL with self test
0 - Disabled (default)
1 - Enabled (&T7)
Bit 6 Local analog loopback (LAL) with self test
0 - Disabled (default)
1 - Enabled (&T8)
Bit 7 Not used
S17 Reserved
S18 Test Timer 0 0 - 255 seconds Set the length of time, in seconds, that the modem conducts a test (commanded by &Tn) before returning to the command mode. If this register value is zero, the test will not automatically terminate; the test must be terminated from the command mode by issuing an &T0 or H command. When S18 is non-zero, the modem returns the OK message upon test termination.
S19 AutoSync Bit Mapped Options 0 - Defines the options for AutoSync operation (see &Q4 command). S19 must be set to desired value before &Q4 is issued.
Bit 0 Reserved
Bit 1 BSC/HDLC format selected
0 - BSC selected (default)
1 - HDLC selected
Bit 2 Address detection enable/disable
0 - Disabled (default)
1 - Enabled
Bit 3 NRZI/NZI coding select
0 - NRZI (default)
1 - NZI
Bit 4 Idle indicator select
0 - Mark idle (default)
1 - Flag or sync idle
Bit 5 Reserved
Bit 6 Reserved
Bit 7 Reserved
S20 AutoSync HDLC Address or BSC Sync Character 0 0 - 255 Defines the HDLC address (S19Bit 1 = 1 ) or BSC Sync Character (S19 Bit 1 = 0) for AutoSync operation (see &Q4 command). S20 must be set to the desired value before &Q4 is issued.
S21 V.24/General Bit Mapped Option Status 52 (34h) (00110100b) - Indicates the status of command options.
Bit 0 Set by &Jn command but ignored otherwise.
0 - &J0 (default)
1 - &J1
Bit 1 CTS behavior (&Rn)
0 - CTS tracks RTS (&R0)
1 - CTS always on (&R1) (default)
Bit 2 RLSD (DCD) behavior (&Cn)
0 - &C0 selected
1 - &C1 selected (default)
Bit 3
Bit 4 DTR behavior (&Dn)
0 - &D0 selected
1 - &D1 selected
2 - &D2 selected (default)
3 - &D3 selected
Bit 5 RLSD (DCD) behavior (&Cn)
0 - &C0 selected
1 - &C1 selected (default)
Bit 6 DSR behavior (&Sn)
0 - &S0 selected (default)
1 - &S1 selected
Bit 7 Long space disconnected (Yn)
0 - Y0 (default)
1 - Y1
S22 Speaker/Result Bit Mapped Option Status 117 (75h) (01110101b) - Indicated the status of command options
Bit 0 Speaker volume (Ln)
0 (L0) - Off
1 (L1) - Low (default)
2 (L2) - Medium
3 (L3) - High
Bit 1
Bit 2 Speaker control (Mn)
0 (M0) - Disabled
1 (M1) - Off on carrier (default)
2 (M2) - Always on
Bit 3
Bit 4 Limit result code
0 - X0
4 - X1
5 - X2
6 - X3
7 - X4 (default)
Bit 5
Bit 6
Bit 7 Reserved
S23 General Bit Mapped Options Status 62 (3Dh) (00111110b) - Indicates the status of command options
Bit 0 Grant RDL
0 - RDL not allowed (&T5) (default)
1 - RDL allowed (&T4)
Bit 1 DTE Rate
0 - 0 - 300 bps
1 - 600 bps
2 - 1200 bps
3 - 2400 bps
4 - 4800 bps
5 - 9600 bps
6 - 19200 bps
7 -38400 bps or higher (default)
Bit 2
Bit 3
Bit 4 Assumed DTE parity
0 - even
1 - not used
2 - odd
3 - none (default)
Bit 5
Bit 6 Guard tone (&Gn)
0 - None (&G0) (default)
1 - None (&G1)
2 - 1800 Hz (&G2)
Bit 7
S24 Sleep Inactivity Timer 0 0 - 255 seconds Sets the length of time, in seconds, that the modem will operate in normal mode with no detected telephone line or DTE line activity before entering low-power sleep mode. The timer is reset upon any DTE line or telephone line activity. If the S24 value is zero, neither DTE line nor telephone inactivity will cause the modem to enter the sleep mode.
S25 Delay To DTR 5 0 - 255
(1 second for synchronous modes 1; 0.01 second otherwise)		 Sets the length of time that the modem will ignore DTR for talking the action specified by &Dn. Its units are seconds for synchronous modes and one hundredths of a second for other modes.
S26 RTS to CTS Delay 1 0 - 255 hundredths of a second Set the time delay, in hundredths of a second, before the modem turns CTS ON after detecting an OFF-to-ON transition on RTS when &R0 is commanded. Pertains to synchronous operation only.
S27 Bit Mapped Option Status 73 (49h) (01001001b) - Indicates the status of command options.
Bit 0 Synchronous/asynchronous selection (&Mn / &Qn)
0 0 0 - &M0 or &Q0
0 0 1 - &M1 or &Q1
0 1 0 - &M2 or &Q2
0 1 1 - &M3 or &Q3
1 0 0 - &Q4
1 0 1 - &Q5 (default)
1 1 0 - &Q6
Bit 1
Bit 3
Bit 2 Leased line control (&Ln)
0 - Dial up line control (&L0) (default)
Bit 4 Internal clock selected (&Xn)
0 - Internal clock (&X0) (default)
1 - External clock (&X1)
2 - Slave clock (&X2)
Bit 5
Bit 6 CCITT/Bell mode select (Bn)
0 - CCITT mode (B0)
1 - Bell mode (B1) (default)
Bit 7 Reserved
S28 Bit Mapped Option Status 0 - Indicates the status of command options.
Bit 0 Reserved
Bit 1 Reserved
Bit 2 Reserved (always 0)
Bit 3 Pulse dialing (&Pn)
0 - 39% - 61% make/break ratio at 10 pulses per second (&P0) (default)
1 - 33% - 67% make/break ratio at 10 pulses per second (&P1)
2 - 39% - 61% make/break ratio at 20 pulses per second (&P2)
3 - 33% - 67% make/break ratio at 20 pulses per second (&P3)
Bit 4
Bit 5 Reserved
Bit 6 Reserved
Bit 7 Reserved
S29 Flash Dial Modifier Time 70 (700 ms) 0 - 255
10 ms interval		 Sets the length of time, in units of 10 ms, 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.
S30 Disconnect Inactivity Timer 0 (disabled) 0 - 255 tens of seconds (0 - 2550 seconds) Sets the length of time, in tens of seconds, that the modem will stay online before disconnected when no data is sent or received. In error-correction mode, any data transmitted or received will reset the timer. In other modes, any data transmitted will reset the timer. The timer is inoperative in synchronous mode.
S31 Bit Mapped Option Status 194 (C2h) (11000010b) - Indicates the status of command options.
Bit 0 Single line connect message enable/disable (\Vn)
0 - Messages controlled by S95, Wn and Vn (\V0) (default)
1 - Single line connect message (\V1)
Bit 1 Auto line speed detection (Nn)
0 - Disabled (N0)
1 - Enabled (N1) (default)
Bit 2 Error correction progress messages (Wn)
0 - DTE speed only (W0) (default)
1 - Full reporting (W1)
2 - DCE speed only (W2)
Bit 3
Bit 4 Caller ID (#CID)
0 - Caller ID disabled (#CID=0) (default)
1 - Short (formatted) Caller ID enabled (#CID=1)
2 - Long (unformatted) Caller ID enabled (#CID=2)
Bit 5
Bit 6 Reserved (Default = 1)
Bit 7 Reserved (Default = 1)
S32 XON Character 17 (11h) 0 - 255, ASCII decimal Sets the value of the XON character.
S33 XOFF Character 19 (13h) 0 - 255, ASCII decimal Sets the value of the XOFF character.
S34 Reserved
S35 Reserved
S36 LAPM Failure Control 7
(00000111b)		 - Indicates the status of command options.
Bit 0 This value indicates what should happen upon a LAPM failure. These fallback options are initiated immediately upon connection if S48=128. If an invalid number is entered, the number is accepted into the register, but S36 will act as if the default value has been entered.
0 - Modem disconnects
1 - Modem stays on-line and a Direct mode connection is established
2 - Reserved
3 - Modem stays on-line and a Normal mode connection is established.
4 - An MNP connection is attempted and if it fails, the modem disconnects
5 - An MNP connection 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
Bit 1
Bit 2
Bit 3 Reserved
Bit 4 Reserved
Bit 5 Reserved
Bit 6 Reserved
Bit 7 Reserved
S37 Desired Line Connection Speed 0 - This register specifies the desired line connection speed.
Notes:
  1. When the Nn command is issued or the S37 register value is modified, the +MS command subparameters are updated to reflect the speed and modulation specified by the S37 value (see +MS command).
    For example:
    If     N0 command is active, S37=10 updates the +MS command subparameters to reflect +MS=10,1,300,12000
    If N1 command is active, S37=10 updates the +MS command subparameters to reflect +MS=10,0,12000,12000
  2. S37 is not updated by the +MS command
  3. Use of the +MS command is recommended instead of the Nn and S37=x commands. Nn and S37=x commands are supported for compatibility with existing communication software
Bit 0 Desired line connection speed. This is interlinked with the Fn command (RC144). If an invalid number is entered, the number is accepted into the register, but S37 will act as if the default value has been entered.
0 Attempt automode connection. If N0 is active, connection is at the most recently sensed DTE speed (+MS command settings are updated to the appropriate values). If N1 is active, connection is attempted at the highest possible speed (+MS settings are updated to 11,1,300,28800 to reflect V.34, automode, 300 bps minimum speed, and 28800 bps maximum speed). (default)
1 Attempt to connect at 300 bps. F1 command (RC144)
2
3
4 Reserved
5 Attempt to connect at V.22 1200 bps. F4 command (RC144)
6 Attempt to connect at V.22 bis 2400 bps. F5 command (RC144)
7 Attempt to connect at V.23
8 Attempt to connect at V.32 bis/V.32 4800 bps. F6 command (RC144)
9 Attempt to connect at V.22 9600 bps. F8 command (RC144)
10 Attempt to connect at V.32 bis 12000 bps. F9 command (RC144)
11 Attempt to connect at V.32 bis 14400 bps. F10 command (RC144)
12 Attempt to connect at V.32 bis 7200 bps. F7 command (RC144)
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5 Reserved
Bit 6 Reserved
Bit 7 Reserved
S38 Delay Before Forced Hang Up 20 0 - 255 seconds This register specifies the delay between the modem's receipt of the H command to disconnect (or ON-to-OFF transition of DTR if the modem is programmed to follow the signal), and the disconnect operation. Applicable to error-correction connection only. This register can be used to ensure that data in the modem buffer is sent before the modem disconnects.
  1. If S38 is set to a value between 0 and 254, the modem will wait that number of seconds for the remote modem to acknowledge all data in the modem buffer before disconnecting. If time expires before all data has been lost. If all data is transmitted prior to time-out, the response to the H0 command will be OK.
  2. If S38 is set to 255, the modem does not time-out and continues to attempt to deliver data in the buffer until the connection is lost or the data is delivered.
S39 Flow Control Bit Mapped Option Status 3
(00000011b)		 - Indicates the status of command options.
Bit 0 Status of command options
Bit 1
Bit 2
Bit 3 RTS/CTS (&K3) (default)
Bit 4 XONN/XOFF (&K4)
Bit 5 Transparent XON (&K5)
Bit 6 Both methods (&K6)
Bit 7 Reserved
S40 Indicates the status of command options.
Bit 0 MNP Extended services (-Kn)
0 - Disable extended services (-K0) (default)
1 - Enable extended services (-K1)
2 - Enable extended services (-K2)
Bit 1
Bit 2 Reserved
Bit 3 Break Handling (\Kn)
0 - \K0
1 - \K1
2 - \K2
3 - \K3
4 - \K4
5 - \K5 (default)
Bit 4
Bit 5
Bit 6 MNP block size (\An)
0 - 64 chars (\A0)
1 - 128 chars (\A1) (default)
2 - 192 chars (\A2)
3 - 256 chars (\A3)
Bit 7
S41 Indicates the status of command options.
Bit 0 Compression selection (%Cn)
0 - Disabled (%C0)
1 - MNP 5 (%C1)
2 - V.42 bis (%C2)
3 - MNP 5 and V.42 bis (%C3) (default)
Bit 1
Bit 6 Auto retrain and fallback/fall forward (%En)
0 0 - Retrain and fallback/fall forward disabled (%E0)
0 1 - Retrain enabled (%E1)
1 0 - Retrain and fallback/fall forward enabled (%E2) (default)
Bit 2
Bit 3 Reserved
Bit 4 Reserved
Bit 5 Reserved
Bit 7 Reserved
S42 Reserved
S43 Reserved
S44 Reserved
S45 Reserved
S46 Data Compression Control 138 136 or 138 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)
S47 Reserved
S48 V.42 Negotiation Action 7 0, 7, or 128. If an invalid number is entered, it is accepted into the S-Register, but S48 will act as if 128 has been entered. The V.42 negotiation process determines the capabilities of the remote modem. However, when the capabilities of the remote modem are known and negotiation is unnecessary, this process can be bypassed if so desired.
0 - Disable negotiation; bypass the detection and negotiation phases; and process with LAPM.
7 - Enable negotiation. (default)
128 - Disable negotiation; bypass the detection and negotiation phases; and process at once with the fallback action specified in S36. Can be used to force MNP.
S49 Reserved
S50 Reserved
S51 Reserved
S52 Reserved
S53 Reserved
S54 Reserved
S55 Reserved
S56 Reserved
S57 Reserved
S58 Reserved
S59 Reserved
S60 Reserved
S61 Reserved
S62 Reserved
S63 Reserved
S64 Reserved
S65 Reserved
S66 Reserved
S67 Reserved
S68 Reserved
S69 Reserved
S70 Reserved
S71 Reserved
S72 Reserved
S73 Reserved
S74 Reserved
S75 Reserved
S76 Reserved
S77 Reserved
S78 Reserved
S79 Reserved
S80 Reserved
S81 Reserved
S82 Break Handling Options - - S82 is for compatibility purposes only, changing this register will not have any affect.
S83 Reserved
S84 Reserved
S85 Reserved
S86 Call Failure reason Code - 0, 4, 5, 9, 12, 13, or 14 When the modem issues a NO CARRIER result code, a value is written to this S-Register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. The cause codes are:
 0 - Normal disconnect, no error occurred.
 4 - Loss of carrier.
 5 - V.42 negotiation failed to detect an error-correction modem at the other end.
 9 - The modems could not find a common protocol.
 12 - Normal disconnect initiated by the remote modem.
 13 - Remote modem does not respond after 10 re-transmissions of the same message.
 14 - Protocol violation
S87 Reserved
S88 Reserved
S89 Reserved
S90 Reserved
S91 PSTN Transmit Attenuation Level 10
(-10 dBm transmit level)		 0 to 15 dBm (Corresponding from 0 to -15 dBm transmit level) Sets the transmit attenuation level from 0 to 15 dBm for the PSTN mode, resulting in a transmit level from 0 to -15 dBm. In some countries, the transmit level may not be changed and there are checks to prevent transmit attenuation level change using ConfigurACE.
S92 Fax Transmit Attenuation Level 10
(-10 dBm transmit level)		 0 to 15 dBm (Corresponding from 0 to -15 dBm transmit level) Sets the transmit attenuation level from 0 to 15 dBm for the fax mode, resulting in a transmit level from 0 to -15 dBm. In some countries, the transmit level may not be changed and there are checks to prevent transmit attenuation level change using ConfigurACE.
S93 Reserved
S94 Reserved
S95 Extended result Codes 0 - The bits in this register can be set to override some of the Wn command options. A Bit set to 1 in this register will enable the corresponding result code regardless of the Wn setting.
Bit 0 CONNECT result code indicates DCE speed instead of DTE speed.
Bit 1 Append/ARQ to CONNECT XXXX result code in error-correction mode (XXXX=rate)
Bit 2 Enable CARRIER XXXX result code (XXXX=rate)
Bit 3 Enable PROTOCOL XXXX result code (XXXX=protocol identifier)
Bit 4 Reserved
Bit 5 Enable COMPRESSION XXXX result code (XXXX=compression type)
Bit 6 Reserved
Bit 7 Reserved
S96 Reserved
S97 Reserved
S98 Reserved
S99 Reserved