Specifications

AN93
34 Rev. 0.9
:U
U-Register Write—This command writes to the 16-bit U-Registers. The format is
AT:Uhh,xxxx,yyyy,zzzz,..., where
hh = user-access address in hexadecimal.
xxxx = data in hexadecimal to be written to location hh.
yyyy = data in hexadecimal to be written to location (hh + 1).
zzzz = data in hexadecimal to be written to location (hh + 2).
etc.
Only one :U command is allowed per AT command line.
+DR=X Data compression reporting.
X
Mode
0 Disabled
1 Enabled
If enabled, the intermediate result code is transmitted at the point after error control negotiation.
The format of this result code is as follows:
Result code
Mode
+DR:NONE Data compression is not in use
+DR:V42B Rec. V.42bis is in use in both directions
+DR:V42B RD Rec. V.42bis is in use in receive direction only
+DR:V42B TD Rec. V.42bis is in use in transmit directions only
+DR:V44 Rec. V.44 is in use in both directions
+DR:V44 RD Rec. V.44 is in use in receive direction only
+DR:V44 TD Rec. V.44 is in use in transmit directions only
+DS=
A,B,C,D
Controls V.42bis data compression function.
A
Direction
0 No compression (V.42bis P0 = 0)
1 Transmit only
2 Receive only
3 Both Directions (V.42bis P0 = 11)
B Compression_negotiation
0 Do not disconnect if Rec. V.42 is not negotiated.
1 Disconnect is Rec. V.42 is not negotiated.
C Max_dict 512 to 65535
D Max_string 6 to 250
Table 18. Basic AT Command Set (Continued)
Command Action