Black Box MD1000C Guide de l'utilisateur télécharger pdf (Page 145)

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.

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.

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.

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.

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.

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.

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 269 270

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Black Box MD1000C Guide de l'utilisateur Page 145