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Contents:Welcome to 56K Information Access Installation for All Operating Systems Technical Reference >
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S-ParametersThe S-Parameters registers denoted with an '*' may be stored in one of the two user profiles by entering the &W command. One of these profiles may be loaded at any time by using the Z command. Registers or register fields quoted as "reserved" are reserved for current or future use by the firmware, or are permanently overridden by PTT limitations. For the latter, control of the equivalent functionality is available with ConfigurACE Call Progress and Blacklisting options. All bit-mapped registers are read-only. The appropriate AT command which controls the relevant bits in the S-Parameter should be used to change the value. S - Read/Write S-Parameter The modem selects an S-Parameter, performs an S-Parameter read or write function, or reports the value of an S-Parameter. n - Establishes S-Parameter n as the last register accessed.
The parameter n can be omitted, in which case the last S-Parameter accessed will be assumed. The S can be omitted for AT= and AT?, in which case the last S-Parameter accessed will be assumed. For example: ATS7 establishes S7 as the last accessed register.
If the number "n" is outside the range of the S-Parameters available, the modem will return the ERROR message. If the value "v" is outside the range permitted for a given S-Parameter, the modem will return the ERROR message. Input and output are always in decimal format. Note that some S-Parameters are read-only. In some cases, writing to the S-Parameter will appear to be accepted but the value will not actually be written. Due to country restrictions, some commands will be accepted, but the value may be limited and replaced by a maximum or minimum value. Minimum, maximum, and default values for S-Parameters may be altered with ConfigurACE. FACTORY DEFAULTSThe factory default values are stored in ROM and are loaded into the active configuration at power up or by the ATZ command. In addition, the designated default profile is subsequently loaded, and may change some of the factory default values. The designated default profile can be changed by entering the &Y command where n is one of the two possible user profiles. The defaults shown are those used by USRobotics in factory profiles zero and one. These may be overwritten by the OEM with ConfigurACE prior to placing the firmware in PROM. Minimum and maximum values may also be imposed by ConfigurACE in response to country PTT requirements. The default values shown in the table below may vary by modem firmware configuration. Consult the MCU firmware release notes for exact configuration. The factory default values may be loaded at any time by entering the &Fn command.
S-PARAMETER DEFINITIONSS0 - Number of Rings to Auto-Answer S0 sets the number of the rings required before the modem automatically answers a call. Setting this parameter to zero disables auto-answer mode. Range: 0-255 rings
S1 - Ring Counter 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. Range: 0-255 rings
S2 - Escape Character 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. Range: 0-255, ASCII decimal
S3 - Carriage Return Character S3 sets the command line and result code terminator character. Pertains to asynchronous operation only. Range: 0-127, ASCII decimal
S4 - Line Feed Character S4 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. Range: 0-127, ASCII decimal
S5 - Backspace Character S5 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 to 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. Range: 0-32, ASCII decimal
S6 - Wait Time before Blind Dialing or for Dial Tone S6 operation is country dependent.
The modem always pauses for a minimum of 2 seconds, even if the value of S6 is less than 2 seconds. Range: 2-255 seconds
S7 - Wait Time for Carrier, Silence, or Dial Tone S7 operation is country dependent.
S8 - Pause Time For Dial Delay S8 sets the time, in seconds, that the modem must pause when the "," dial modifier is encountered in the dial string. Range: 2-255 seconds
S9 - Carrier Detect Response Time S9 is supported for backwards compatibility only. No value can be written. Responds with default value. Range: 6 tenths of a second
S10 - Lost Carrier To Hang Up Delay S10 sets the length of time, in tenths 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 register S9. Therefore, the S10 value must be greater than the S9 value or else the modem disconnects before it recognizes the carrier. Range: 1-255 tenths of a second
Note: For Call Waiting detection, if the modem is set to US country code and S10 >=16, then the modem will detect the Call Waiting tone and hang-up the line. If S10 <16, the modem will not detect Call Waiting tone. S11 - DTMF Tone Duration S11 operation is country dependent.
S12 - Escape Prompt Delay (EPD) S12 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 the DTE. If any characters are detected during this time, the OK will not be sent. Sending of the OK result code does not affect entry into command mode. (See 3.1.3.) Range: 0-255 1/50 of a second
S14 - General Bit Mapped Options Status S14 indicates the status of command options. Default: 138 (8Ah) (10001010b) Bit 0 This bit is ignored.
S16 - Test Mode Bit Mapped Options Status S16 indicates the test in progress status. Default: 0 Bit 0 - Local analog loopback
S19 - Reserved S19 is supported for backwards compatibility only. No value can be written. Responds with default value. Range: None
S20 - Reserved S20 is supported for backwards compatibility only. No value can be written. Responds with default value. Range: None
S21 - V.24/General Bit Mapped Options Status S21 indicates the status of command options. Default: 52 (34h) (00110100b) Bits 0 - 1 Reserved (0)
S22 - Speaker/Results Bit Mapped Options Status S22 indicates the status of command options. Default: 117 (75h) (01110101b) Bits 0-1 Speaker volume (Ln)
S23 - General Bit Mapped Options Status S23 indicates the status of command options. Default: 0 Bits 0-6 Not used
S24 - Sleep Inactivity Timer S24 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. Range: 0-255 seconds
S25 - Delay To DTR Off S25 sets the length of time that the modem will ignore DTR for taking the action specified by &Dn. Its units are seconds for synchronous modes and one hundredths of a second for other modes. Range: 0-255 (1 second for synchronous modes 1; 0.01 second otherwise)
S26 - RTS to CTS Delay S26 sets 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. Range: 0-255 hundredths of a second
S27 - Bit mapped register Bit S28 - Bit Mapped Options Status S28 indicates bit mapped options status. Default: 0 Bits 0 - 1 Reserved
S29 - Flash Dial Modifier Time S29 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. S29 is a country dependent parameter. The S29 value cannot be changed using S29=XX. Range: 0-255 10 ms intervals
S30 - Disconnect Inactivity Timer S30 sets the length of time, in tens of seconds, that the modem will stay online before disconnecting 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. Range: 0-255 tens of seconds (0-2550 seconds)
S31 - Bit Mapped Options Status S31 indicates bit mapped options status. Default: 192 (C0h) (11000000b) Bit 0 Single line connect message enable/disable (\Vn)
S32 - Bit mapped register Bit S36 - LAPM Failure Control Default: 7 (00000111b) Bits 0-2 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.
S38 - Delay Before Forced Hang Up S38 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 parameter can be used to ensure that data in the modem buffer is sent before the modem disconnects.
S39 - Flow Control Bit Mapped Options Status Default: 3 (00000011b) Bits 0-2 Status of command options
S40 - General Bit Mapped Options Status S40 indicates the status of command options. Default: 104 (68h) (01101000b) Bits 0-1 MNP Extended Services (-Kn)
S46 - Data Compression Control S46 controls selection of compression. The following actions are executed for the given values: Range: 136 or 138
S48 - V.42 Negotiation Control 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. 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.
S86 - Call Failure Reason Code When the modem issues a NO CARRIER result code, a value is written to S86 Register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. The code definitions are: Range: 0-26
S91 - PSTN Transmit Attenuation Level In non-PCM modes (V.90 or K56flex are PCM modes), S91 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. Range: 0 to 15 dBm (Corresponding to 0 to -15 dBm transmit level.)
S92 - Fax Transmit Attenuation Level S92 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. Range: 0 to 15 dBm (Corresponding to 0 to -15 dBm transmit level.)
S95 - Extended Result Codes Control A bit set to a 1 in this parameter, in conjunction with the W command, will enable the corresponding extended result code. The +MR, +ER, and +DR settings also control S95 bits 2, 3, and 5, respectively. The more recent settings of +MR, +ER, and +DR, or host writing of S95 bits 2, 3, and 5, along with the W command setting, determine the corresponding actual result code reporting (see +MR, +ER, DR, and W commands). Default: 0 Bit 0 CONNECT result code indicates DCE speed instead of DTE speed.
S210 - V.34 Symbol Rates The bits in this parameter control V.34 symbols rates and enables/disables V.34 asymmetric rates. This parameter is used for diagnostic purpose only. Default: 13 (0Dh) (00001101b) Bits 0-2 Selects the range of allowed V.34 symbol rates.
Examples S210=13 Enable asymmetric rates with all symbol rates available (Default.).
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