Reading And Assigning S-Register Values; At Commands That Affect S-Registers - Multitech MT2834MR Owner's Manual

PN 88300150
S48
Control V.34 Connect Speed
Unit: N/A
Range: 28, 26, 24, 21, 19, 16, 14, 12, 96 and 48
Default: 0
Description: S48 defines the speed at which the modem connects within V.34 mode. For example,
S48=21 means that the maximum connect speed is 21.6K bps. S48 compensates for line
conditions that have trouble supporting the higher V.34 speeds (e.g., 26.4K, 24K bps, etc).
The S48 default is 0, which indicates a connection attempt at 28.8K bps. Note that the
$MB command is also used for V.34 rate control.
4.2

Reading and Assigning S-Register Values

The S command reads and assigns S-Register values. To read an S-Register value, type the letter S
followed by the S-register number and a question mark (?), then hit ENTER. For example, typing ATS7?
and hitting ENTER displays the value of S-Register S7 in a 3-digit decimal form. The number 8 appears
as 008, the number 30 appears as 030, and the number 255 appears as 255.
Convert all ASCII characters to their decimal equivalents before entering them. S-Register decimal values
range from 0-127 for ASCII characters, or 0-255 for numeric values. A complete ASCII conversion chart is
located in Appendix A of this manual.
4.2.1 Examples of Assigning Values
1. Let's say you wish to have longer pauses caused by the comma in a dial command; five seconds
instead of two. Typing ATS8=5 assigns 5 as the value for S-Register S8 (meaning the modem pauses
five seconds for a comma in a dial command).
2. In a second example, let's say that you wish to configure the MT2834MR modem to answer incoming
calls after the 30th ring instead of after the first ring. To configure S-Register S0 with a value of 30,
type ATS0=30 and hit ENTER.
4.2.2 Examples of Reading Values
To verify that you entered the value correctly in the above examples, type ATS8? and hit ENTER in the
first example and ATS0? in the second example. You should receive the response 005 in the first
example and 030 in the second example. Type ATL6 to list all S-Registers and their values.
When configuring the S-Registers, it is a good practice to include the verification read-entry in the same
command line as the configuration assignment-entry. In the preceding examples, type ATS8=5S8? and
ATS0=30S3?.
4.3

AT Commands that Affect S-Registers

Your MT2834MR's default configuration is originating a call to another 28,800 bps modem that supports
error correction, data compression, and flow control ("maximum throughput"). If the receiving modem is
not compatible, the MT2834MR can match any ITU-T or Bell Standard modem (but not proprietary
protocols).
You may, however, have applications where you do not want this kind of maximum throughput (e.g.,
service not supporting error correction, or the V.42 handshake interferes with logon sequence). If so,
configure the MT2834MR as strictly an auto-answering device or perhaps to function in a UNIX
environment.
The &W command, used in conjunction with specific other AT commands and S-Registers, reconfigures
the MT2834MR to conform to a specific application. An example of the &W command:
AT&E2$SP1#L3$R0$MB19200$SB115200$EB1S0=10&W0<CR>
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