User Manual
Appendix C Hayes AT Command Reference
RFI-9256 Radio Modem User Manual Page 80 of 96
Table 33: AT&V view profile commands
C.2 S-Register Commands
C.2.1 “ATS0” Rings Before Answer
Sets the number of rings that are output before the RFI-9256 automatically answers a call.
•
ATS0=3<CR>
: Causes 3 RING messages to be output before answering.
C.2.2 “ATS2” Escape Character
S-register 2 contains the ASCII values of the character that forms the escape sequence. The default value for
this register is the ‘+’ character, with an ASCII value of 43. The radio will recognise three + characters
(+++) as the escape sequence with the escape guard time delay before and after the sequence.
ATS2=36<CR>
: Recognises three dollar characters “$$$” as the escape sequence.
ATS2=45<CR>
: Recognises three minus characters “---“ as the escape sequence.
C.2.3 “ATS7” Wait for Carrier
S-register 7 contains a value, in seconds, equivalent to the length of time the radio will wait for a carrier
signal after dialling. If a carrier is not detected within the time specified in this register, the radio will hang
up and return a
NO CARRIER
message.
ATS7=20<CR>
: Wait for up to 20 seconds for a connection to be established before returning
NO
CARRIER
.
C.2.4 “ATS12” Escape Sequence Guard Time
The escape sequence guard time is the time delay required immediately before and after entering an escape
sequence.
For the radio to distinguish the escape sequence from ordinary data, there must be a period of silence both
before and after the escape sequence is entered. If the escape sequence guard time is one second and the
escape sequence character has been defined as ‘+’, for the radio to recognise an escape sequence the line
must be silent for one second, then “+++” is transmitted in rapid succession, and then another one second
silence.
S-register 12 is also used to time the period between the escape sequence characters as they are typed. If the
period between the first and second escape characters or second and third escape characters being entered is
greater than the value in s-register 12, the radio will not recognise the escape sequence.
The guard time is in units of milliseconds (or 1/1000 of a second).
ATS12=990<CR>
: Maintain silence on the line for 990ms (0.99 seconds) before and after entering
the escape sequence.