AT Command Set
Preliminary
22
Order No. DM336P-002-01
Version : DM336P-AT-P04
Note: Do not set the value of the backspace character between 33 and 126.
Register
S6
: Dial Tone Wait Time.
Register S6 sets the time to wait after going off-hook before dialing the first digit in a Dial command when using
the X0, X1 or X3 responses. The default time is 2 seconds, although you can change it to any value between 2
and 255 seconds. This feature is convenient when it takes longer than 2 seconds to obtain a dial tone.
Register
S7
: Remote Carrier Signal Wait Time.
Register S7 decides how many seconds to wait for a remote modem's carrier signal before hanging up. The
default value is 45 seconds. You can change it to a value between 1 and 255 seconds. Register S7 also controls
the time-out of the W command.
Register
S8
: Pause Time for Comma
Register S8 decides how many seconds to pause for each comma ( , ) encountered in a Dial command line. You
usually use the comma when dialing through a PBX or other special telephone services to wait for an outside
telephone line. The default value is 2 seconds, although you can change it to a value between 0 and 255 seconds.
An alternative to changing this register is to include more than one comma in your command line.
Register
S9
: Carrier Detect Response Time.
Register S9 sets the time the remote modem's carrier signal must be present for the local modem to recognize it.
This feature ensures that your modem does not mistake a busy signal, ring, or voice for the carrier signal. The
value of this register is in tenths of a second. The default value is 600 ms , although you can change it from 1 to
255. For example, entering a value 13 means that the remote modem's carrier signal must be present for 1.3
seconds for the local modem to recognize it. Setting this value higher increases the chances the modem will not
mistakenly identify the carrier signal.
Register
S10
: Carrier Loss Time.
Register S10 sets the time between the loss of a remote modem's carrier signal and when the local modem
disconnects. This allows the remote modem's carrier signal to momentarily disappear from the telephone line. The
value of this register is in tenths of a second. The default value is 1.4 seconds, although you can change it from 1
to 255. You may want to set this value higher if you have a noisy telephone line that might interfere with the
remote modem's carrier signal. If you want your modem to ignore the Carrier Detect status and act as if the
remote modem's carrier signal is always present, set the value to 255.
Register
S11
: Touch Tone Dialing Duration.
Register S11 controls the speed of the Touch Tone (DTMF) dialing. You can change the value from 50 to 255 ms.
The default value will be 95 ms which sets a dialing rate of 5.26 digits per second. Increasing the value to 255
slows the dialing rate to 1.9 digits per second.
Note : Register S11 has no effect on pulse dialing, which is fixed at 10 pulses per second.
Register
S12
: Escape Guard Time.
Register S12 controls the escape guard time ( i.e. the time delay required before and after you enter the escape
characters). The guard time prevents your modem from misinterpreting data as the escape sequecce. This value
is designated in measurements of 20 ms. The default value is 50 ( which is equivalent to one second), although
you can change it to between 0 (0 seconds) to 255 (5.1 seconds).
