Black Box 3600 User Manual
Modem 3600
10-1
Chapter 10
Status Registers
S-Registers
Most modem configuration information is stored in a part of memory
called status (S) registers. During operation this information is used to
determine modem functions.
called status (S) registers. During operation this information is used to
determine modem functions.
Information stored in S-registers can be changed by the AT or V.25
command sets and by pushbuttons in response to the LCD prompt. These
are the preferred methods. Some software programs also access
S-registers by the AT command set, but this action is transparent to the
user. The command indicates which memory bit(s) to alter to select an
option or to perform a function. The S-register values comprise the
configuration profile.
command sets and by pushbuttons in response to the LCD prompt. These
are the preferred methods. Some software programs also access
S-registers by the AT command set, but this action is transparent to the
user. The command indicates which memory bit(s) to alter to select an
option or to perform a function. The S-register values comprise the
configuration profile.
Generally, the user should not directly alter S-register values. However,
the user has the option of entering S-registers via ATS commands and
directly altering the register value. This is called "writing" to an S-register.
the user has the option of entering S-registers via ATS commands and
directly altering the register value. This is called "writing" to an S-register.
Note
Writing to an S-register is not a preferred method and should
only be used by programmers who need to manipulate
S-registers so they can interact with a software program under
development or a similar activity.
Writing to an S-register is not a preferred method and should
only be used by programmers who need to manipulate
S-registers so they can interact with a software program under
development or a similar activity.
Some S-registers cannot be altered by the ATS command series. These are
called “read only” S-registers. In addition to the definitions in this chapter,
Appendix E contains a quick list of S-registers and indicates if they are
read only or read and write.
called “read only” S-registers. In addition to the definitions in this chapter,
Appendix E contains a quick list of S-registers and indicates if they are
read only or read and write.
Figure 10-1 shows how the inputs to an S-register (S22 in this example)
are used to select a particular option. Bits 3 and 2 of S22 control speaker
options. Some communication software packages may use the AT
command set. For example purposes, bit values are arbitrary.
are used to select a particular option. Bits 3 and 2 of S22 control speaker
options. Some communication software packages may use the AT
command set. For example purposes, bit values are arbitrary.