INSYS Modem 336 LL 2D/4D 5.x Originate / Answer Manual page 76

S Registers
S39* Flow control
Selection of the data flow control between the PC and the modem
S39=0
S39=3
S39=4
S39=5
S39=6
S40* Break handling and MNP5 block size
Bit
Bit 0
Bit 1
Bit 2
Bit 3-5
Bit 6-7
S41* Compression settings Compression type, retrain
Bit
Bit 0.1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
S46* V.42bis Data Compression
S46=136 No data compression
S46=138 V.42bis data compression on
76
No data flow control (AT&K0)
RTS/CTS data flow control (AT&K3)
XON/XOFF data flow control (AT&K4)
Transparent XON data flow control (AT&K5)
RTS/CTS and XON/XOFF data flow control
Meaning
Reserved
Reserved
Reserved
Break handling
MNP block size
Meaning
Select compression type
Auto retrain
Reserved
Reserved
Reserved
Fall back/fall forward
Reserved
INSYS Modem 336 LL 2D/4D 5.x Originate / Answer
Break handling
0: see AT\K0
1: see AT\K1
2: see AT\K2
3: see AT\K3
4: see AT\K4
5: see AT\K5
MNP block size
0: 64 characters
1: 128 characters
2: 192 characters
3: 256 characters
Compression selection
0: No compression (AT%C0)
1: MNP5
2: V42bis
3: MNP5 or V.42bis (AT%C3)
Auto retrain control
0: No auto retrain (AT%E0)
1: Auto retrain
FB/FF Control
0: No FB/FF
1: FB/FF
(AT\A0)
(ATM1)
(AT\A2)
(AT\A3)
(AT%C1)
(AT%C2)
(AT%E1)
(AT%E2)