B-22 Appendix B Date Code 20010518
SEL-2020 Instruction Manual
Table B.6: S Register Information - Part # XE1414V (continued)
Register Parameter (default) Function
S7 1-60 seconds (60) Carrier signal wait. Number of seconds modem will
wait for carrier signal after dialing or answering. If
no carrier detected during this time, it responds with
"NO CARRIER".
S8 0-255 seconds (2) Pause time for comma. Number of seconds modem
will pause for each comma placed in a dial command
string.
S9 1-255/0.1 seconds (6) Carrier detect response time. Number of seconds the
responding carrier signal must be present for the
modem to recognize it. Default means listen for 0.6
seconds. Increasing the time reduces the chance the
modem will mistake noise, such as a voice or a busy
signal, as a carrier signal.
S10 1-255/0.1 seconds (14) Carrier loss time. Length of time a signal from
remote modem may be lost before modem hangs up.
S11 50-255 milliseconds (90) DTMF tone. Sets duration and spacing of tones
when using touch tone dialing. Higher setting means
slower dialing rate.
S12 20-255/0.02 seconds (50) Escape code guard time. Length of quiet time
required before and after you enter Escape command.
Set the guard time large enough so the escape can be
recognized, given the rate at which you are
transmitting. S12=0 allows recognition of any
successive +++ with no guard time.
S18 1-255 seconds (0) Test timer. Sets duration of a modem diagnostic test
before it automatically cancels.
USING MODEM COMMANDS
Dial Strings
Dial strings are initiated with the attention code (AT) followed by the appropriate parameters
(see AT Command Set Description). For example, the dial string ATDT3321890 instructs the
modem to dial (D) a number using touch tone dialing (T), ATDP instructs the modem to dial
using pulse dialing (P). The phone number (3321890) always follows the dialing command and
its modifiers.
You can include some characters in the phone number to affect the dialing process: adding a
comma (,) pauses the modem for a time period set in the modem’s S8 register (see S Register
Information). Adding an exclamation character (!) causes the modem to execute a hook flash
To Next Page
Loading...
