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Modem AT Commands & S-Registers
Reading and Assigning S-Register Values
Use the S command to assign a value to an S-register and to read an its
current value. To read an S-register value, in terminal mode, type S, the S-
register number, and a question mark (?), and press ENTER. For example,
to display the value of register S7, type ATS7? and press ENTER. The
value appears as a three-digit decimal number (e.g., 045).
To assign a new value to an S-register, type S, the S-register number, an
equals sign (=), and a decimal number. Convert all ASCII characters to their
decimal equivalents before entering. Valid S-register decimal values are
shown for each register in the previous section. To make the change
permanent, use the &W0 command.
Examples of Assigning Values
1. You want to have longer pauses caused by the comma in a dial
command: five seconds instead of two. Type ATS8=5 to assign 5 as
the value for register S8. The modem now pauses five seconds for
every comma in a dial command.
2. You want to configure your modem to answer incoming calls after
the fourth ring instead of after the first ring. To configure register
S0 with a value of 4, type ATS0=4 and press ENTER.
3. You are calling long distance to another country code, and it is
taking a long time to connect. The register S7 (time to wait for
carrier) factory default setting of 50 seconds is insufficient; a time-
out occurs and cancels the call before a connection is made. To
change the S7 value to 75 seconds, type ATS7=75 and press
ENTER . Now, after dialing, the modem allows 25 more seconds
for a carrier signal before aborting the call. The additional 25
seconds should provide enough time for international calls.
Examples of Reading Values
1. To verify that you entered the value correctly in the preceding
examples, type ATS8? and press ENTER in the first example,
ATS0? in the second example, and ATS2? in the third example.
You should receive the responses 005, 004, and 075, respectively.
2. When configuring S-registers, it is a good practice to include the