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7.2 S-Register Operation
To read a register value:
Enter ATSn? (n=register number) for decimal value
or
ATSn?^ for hexadecimal value
For example, to determine the current backspace character
Enter ATS5?
The screen will show the ASCII value of the backspace character stored in register S5.
To change (write to) a register value:
Enter ATSn=v (n=register number, v=decimal value)
or
ATSn=^v (^v=hexadecimal value)
Not all registers can be set by the ATSn=v (or ^v) command. Remember that some
registers are read-only.
To change the escape character from + to the ESC key (ASCII value of 27):
Enter ATS2=27
To return the modem to the command mode press the ESC key three times:
(pause) ESC ESC ESC (pause)
7.2.1 I
B
NDIVIDUAL
IT
Most operators use AT commands as the primary method of changing S-register options. However, some
options stored in registers do not have an associated AT command. For these options, an individual bit
AT command can be used to change the setting of the bit controlling the option.
To change a single bit value within a register:
Enter ATSn . (bit#) = v, where n= register number, v= bit value 1 or 0
Example:
S-register 27, bit 2 selects dial-up or leased-line operation.
• AT command method:
AT&L selects dial-up operation (sets S27 bit 2 to 0)
AT&L1 selects leased-line operation (sets S27 bit 2 to 1)
• Individual bit method:
ATS27.2=0 selects dial-up operation (sets S27 bit 2 to 0)
ATS27.2=1 selects leased line operation (sets S27 bit 2 to 1)
C
(S
.(
#) =
OMMAND
N
BIT
NOTE
)
V
CHAPTER 7: Status Registers
9 7
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