si2439-a-gm Silicon Laboratories, si2439-a-gm Datasheet - Page 30

• Manufacturer Part Number: si2439-a-gm
• Description: V.92 And V.34 Isomodem With Global Daa
• Manufacturer: Silicon Laboratories

Si2494/39
30
+DS = A,B,C,D
*Y[sequence]
+DS Options
+DS = A,B,C
Command
+DS = A,B
+DS = A
+DR=X
Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued)
Special Access Mode—This command enables special modes and data memory access.
[sequence]
254:Waaaa,dddd
254:Qaaaa
2
1
0
Data compression reporting.
X
0
1
If enabled, the intermediate result code is transmitted at the point after error control negotia-
tion. The format of this result code is as follows:
Result code
+DR:NONE
+DR:V42B
+DR:V42B RD
+DR:V42B TD
Controls V.42bis data compression function.
A
B
C
D
Mode
Disabled
Enabled
Direction
Compression_negotiation
Maximum dictionary size
512
Maximum string size
6 to 250 (28 default)
0 No compression
1 Transmit only
2 Receive only
3 Both Directions
0 Do not disconnect if V.42 is not negotiated.
1 Disconnect is V.42 is not negotiated.
Mode
Data compression is not in use
Rec. V.42bis is in use in both directions
Rec. V.42bis is in use in receive direction only
Rec. V.42bis is in use in transmit directions only
Description
Write hexadecimal data value dddd to hexadecimal data address
aaaa. Only one 254:W command per line.
Read hexadecimal address aaaa. Returns hexadecimal data value
Enable continuous answer tone for the ATA command. Use ATZ to
clear this mode. For example, the single-line, multiple command is
AT*Y2A.
Enable continuous DTMF tone for first digit used in the ATD com-
mand. Use ATZ to clear this mode. For example, the single-line, mul-
tiple command for a continuous DTMF “1” digit would be AT*Y1D1.
Exit from 254:W or 254:Q access mode. Must reside on a separate
line and must be the final sequence be sent after the final 254:W or
254:Q command.
dddd. Only one 254:Q command per line.
Rev. 1.0
Action