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MultiModemISI Hybrid Series, ISIHI-2S 87
Chapter 4—MODEM AT Commands, S-Registers, Result Codes
Modem
S89 Off-line Time
Unit: 1 second
Range: 0, 5-255
Default: 10
S89
sets the length of time, in seconds, a modem waits in the off-line command mode
before it goes into standby mode. If S89 is set to 20 seconds, the modem waits 20
seconds in off-line command mode before going into standby mode. Setting S89 to zero
(0) prevents the modem from ever entering standby mode.
Setting S89 to any value between zero and five (1-4) effectively sets the value to five,
because five seconds is the minimum possible wait time.
Reading and Assigning S-Register Values
Use the S command to assign a value to an S-register and to read an it’s current value.
To read an S-register value, in terminal mode, type S, the S-register number, and a
question mark (?), and press E
NTER. 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 E
NTER.
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 E
NTER 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 verification read
command in the same command string as the configuration assignment command. In
the three preceding examples, type ATS8=5S8?,
ATS0=4S3?, and ATS7=75S7?,
respectively.