Multi-Tech Systems MTS2SA-T ユーザーズマニュアル
Chapter 10
− Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A)
118
S-Registers
This section covers S-Register descriptions and their default values (which 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.
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.
All bit-mapped registers are read-only. The appropriate AT command, which controls the relevant bits in the S-
Register, should be used to change the value.
Register, should be used to change the value.
.
S - Read/Write S-Register
The modem selects an S-Register, performs an S-Register read or write function, or reports the value of an S-
Register.
n
The modem selects an S-Register, performs an S-Register read or write function, or reports the value of an S-
Register.
n
Establishes S-Register n as the last register accessed.
n=v
Sets S-Register n to the value v.
n?
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 AT= and AT?, in which case the last S-Register accessed will be assumed. For example:
ATS7 establishes S7 as the last accessed register.
AT=40 sets the contents of the last register accessed to 40.
ATS=20 sets the contents of the last register accessed to 20.
If the number n is outside the range of the S-Register available, the modem will return the ERROR message. If the
value v is outside the range permitted for a given S-Register, the modem will return the ERROR message. Input and
output are always in decimal format. Note that some S-Registers are read-only.
In some cases, writing to the S-Register 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 by inserting a country profile using patch
code.
for AT= and AT?, in which case the last S-Register accessed will be assumed. For example:
ATS7 establishes S7 as the last accessed register.
AT=40 sets the contents of the last register accessed to 40.
ATS=20 sets the contents of the last register accessed to 20.
If the number n is outside the range of the S-Register available, the modem will return the ERROR message. If the
value v is outside the range permitted for a given S-Register, the modem will return the ERROR message. Input and
output are always in decimal format. Note that some S-Registers are read-only.
In some cases, writing to the S-Register 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 by inserting a country profile using patch
code.
Certain modem values are stored in memory locations called
S-Registers. Use the S command to read or to alter the
contents of S-Registers (see previous section).
Table of S-Registers
Register Unit Range Default Description
S0
1
ring
0–255 0
Number of Rings to Auto-Answer:
Sets the number of
rings until
the modem answers. ATS0=0 disables autoanswer completely. *
S1
1
ring
0–255
0 Ring Counter. Counts the rings that have occurred. S1 is cleared if
no rings occur over eight-second intervals.
S2
decimal
0–255
43
(+)
Escape Character.
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, e.g., no
escape character will be recognized.*
ASCII ‘+’. A value over 127 disables the escape process, e.g., no
escape character will be recognized.*
S3
decimal
0–127
13
(^M)
Carriage Return Character.
Sets the command line and result code
terminator character. Pertains to asynchronous operation only.
S4
decimal
0–127
10
(^J)
Line Feed Character.
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.
character is output after the Carriage Return control character if
verbose result codes are used.
S5
decimal
0–255
8
(^H)
Backspace Character.
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.
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.