Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 66)

A N 9 3
66 Rev. 1.3
+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
+DS44 =
A,B,C,D,E,F,G,
H,I
Controls V.44 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 Capability
0 Stream method
1 Packet method
2 Multi-packet method
D Max_codewords_tx 256 to 65536
E Max_codewords_rx 256 to 65536
F Max_string_tx 32 to 255
G Max_string_rx 32 to 255
H Max_history_tx
 512
I Max_history_rx
 512
*Note: Si2493 only
+ES = A, B, C
Enable synchronous access mode
A – specifies the mode of operation when initiating a modem
connection
D = Disable synchronous access mode
6 = Enable synchronous access mode when connection is
completed and data state is entered.
B – This parameter should not be used.
C – Specifies the mode of operation when answer a modem
connection
D = Disable synchronous access mode
8 = Enable synchronous access mode when connection is
completed and data state is entered.
Table 39. Basic AT Command Set (Continued)
Command Action