insys icom i-modul 144/56k, Designer'S Manual, Page: 39 / 63

i-modul Modem 144/56k AT Command Reference
Command Description
AT&S
DSR behaviour
This command determines how the i-modul Modem 144/56k 3.0 basic 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. Otherwise 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 i-modul Modem 144/56k 3.0 basic trans-
fers messages 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)
39