AT Command Set
INSYS Modem 56k small INT 2.0/USB 1.0
66
June 06
Command
Description
AT&V<n>
Show
the
configurations
AT&V0
The active configuration of the modem, the saved user defaults and
the saved phone numbers 0 to 3 (the parameter 0 may be omitted) are
displayed
AT&V1
Displays the diagnostic data of the last connection (connection part-
ner, reason for disconnect).
TERMINATION REASON:
Reason for disconnect.
E.g.:
Connection termination via command (
ATH
:
“
LOCAL REQUEST
”).
LAST TX rate:
Last baud rate at the phone line in send direction,
prior to the termination.
HIGHEST TX rate:
Highest baud rate that was achieved at the
phone line in send direction, prior to the termination.
LAST RX rate:
Last baud rate at the phone line in receive direction,
prior to the termination.
HIGHEST RX rate:
Highest baud rate that was achieved at the
phone line in receive direction, prior to the termination.
Note:
The data rates may vary if a fall forward, fall back or retrain
occurred during the connection. To impact the negotiated data rate,
use the command
AT+MS
.
PROTOCOL:
Displays the used error correction protocol. “
LAPM
“
equals a V.42 secured connection. For “
NONE
”, the connection was not
error corrected (the error corrected can be influenced with the com-
mand
AT\N
).
COMPRESSION:
Displays the used data compression method. The ex-
ample shows the used compression method V.42bis (the compression
method can be set with the command
AT%C
).
LINE QUALITY:
Displays the quality of the data connection (devia-
tion from the eye diagram). Low values indicate a good line quality.
The line quality value must be evaluated differently depending on the
negotiated data rate.
Connections with more than 9600 baud will reach the value “000” for
good lines and should not have values of more than “010”.
For connections with 33600 baud good lines will have values between
010…030. Depending on the settings and the modulation type a fall
back or retrain is triggered if the line quality is too bad to enable a new
negotiation of the connection (if necessary with a slower speed).
Rx LEVEL:
Displays the receive level (which is internally applied at
the modem chip) in –dBm. High values indicate a low input level, low
values indicate a high input level. The optimum receive levels range
from approx. 012 to 028. To high levels could cause distortions; too
low levels will cause the line noise to have a negative impact on the
connection quality.
Local Rtrn Count:
Number of retrains (renegotiation of the con-
nection), triggered by the local modem.
Remote Rtrn Count:
Number of retrains (renegotiation of the
connection), triggered by the remote modem.
AT&V3
Display of the currently set baud rate (
AT*S<n>
) as well as the cur-
rently set data format (
AT*U<n>
).
Содержание 56k Small INT 2.0
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