ZyXEL Communications U-1496 series - S-Register Descriptions

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.