to set only bit 'b' of S-Register 'r' to value 'n' without affecting other bits in this S-Register.
When using ATSr = n, you need to do a conversion to or from the binary number to find out the
bits. For example, if you want to set S38 bit 3 to 1 for a specific application:
Do an ATS38 = ? to find the original value.
Convert it to binary:
Bit
Binary Value
Decimal Value Sedecimal Value
We Use
0
00000001
1
$01
1
00000010
2
$02
2
00000100
4
$04
3
00001000
8
$08
*
4
00010000
16
$10
5
00100000
32
$20
6
01000000
64
$40
7
10000000
128
$80
To set a bit to '1', do a logic OR with the value:
10001000
136
$88
01000000
64
$40
OR
00001000
8
$08
00001000
8
$08
10001000
136
$88
01001000
72
$48
To set a bit to '0', do a logic NOT AND with the value:
NOT
00001000
8
$08
00001000
8
$08
11110111
247
$F7
11110111
247
$F7
AND
10001000
136
$88
01000000
64
$40
10000000
128
$80
01000000
64
$40
Using the decimal value, do an ATS38 = n to set the register.
Using ATS38.3 = 1 to do the same is much easier.
Note: If you enter values from the U-1496 front panel, use the sedecimal (hex) values.
S-REGISTER DESCRIPTIONS
Following are the descriptions for each S-Register. In most bit mapped S-Registers, the default
bit value is 0 which is the normal situation and only the non-default situation is described. Some
reserved bits are for factory use and the user should not change them.
S0
Default= 0;
Sets the number of rings on which the modem will answer automatically.
S0=0 disables autoanswer. The range of rings is 0 to 255. (Country specific)
S1
Default=0;
Counts the incoming rings and stores the value to this register. User can
read but should not change this value.
S2
Default=43;
S2 holds the ASCII decimal value for Escape Sequence character.
Default character is "+". A value of 128-255 disables the escape code.
S3
Default=13;
Holds the ASCII decimal value of Carriage Return character.
S4
Default=10;
Holds the ASCII decimal value of Line Feed character.
