AT Command Reference
INSYS Modem 56k small EU 2.1
56
Command
Description
AT&S
DSR behaviour
This command determines how the INSYS Modem 56k small EU 2.1 treats its DSR
(CT107) output.
AT&S0
DSR always ON (default)
AT&S1
DSR ON after a response tone has been detected;
DSR OFF when no carrier is detected any more.
ATT
Enabling the tone dialling method
Starting with this command, each dial up is performed with the tone dialling method,
until an
ATP
or
ATDP
command switches it back to pulse dialling.
AT-TRV
Phone Line Voltage Measurement (Tip Ring Voltage)
Use the command
AT-TRV
to measure the phone line voltage (Tip Ring Voltage). The
result is yielded in volt. For an existing connection the voltage range is 5 V – 12 V. Oth-
erwise the voltage is higher than 20 V. If the voltages are lower than 2 V, no phone line
is connected.
ATV<n>
Format of modem messages
This command determines, whether the INSYS Modem 56k small EU 2.1 transfers mes-
sages to the application in short or long form.
ATV0
Messages in short format, i.e. only the error number
ATV1
Messages in long format, i.e. the error text (default)
AT\V<n>
Format of connect rate messages
AT\V0
This command enables the display of the connect message in three
lines.
AT\V1
This command enables the display of the connect message in one
line.
(default)
