Chapter 4—MODEM AT Commands, S-Registers, Result Codes

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.

Modem

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 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 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.

MultiModemISI Hybrid Series, ISIHI-2S

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Multi Tech Equipment ISIHI-2S Reading and Assigning S-Register Values, Examples of Assigning Values, S89 Off-line Time
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