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Appendix 2: AT Command Set
Perle 833IS User Guide 265
S36 - LAPM Failure
Control
Default: 7 (00000111b)
Bits 0-2 This value indicates what should happen upon a LAPM failure. These
fallback options are initiated immediately upon connection if S48=128. If
an invalid number is entered, the number is accepted into the register, but
S36 will act as if the default value has been entered.
0 = Modem disconnects.
1 = Modem stays on-line and a Direct mode connection is established.
2 = Reserved.
3 = Modem stays on-line and a Normal mode connection is established.
4 = An MNP connection is attempted and if it fails, the modem disconnects.
5 = An MNP connection is attempted and if it fails, a Direct mode connection
is established.
6 = Reserved.
7 = An MNP connection is attempted and if it fails, a Normal mode
connection is established. (Default.)
Bits 3-7 Reserved
S46 - Data
Compression
Control
Controls selection of compression. The following actions are executed for the given
values:
Range: 136 or 138
Default: 138
S46=136 Execute error correction protocol with no compression.
S46=138 Execute error correction protocol with compression. (Default.)
S48 - V.42
Negotiation Action
The V.42 negotiation process determines the capabilities of the remote modem.
However, when the capabilities of the remote modem are known and negotiation is
unnecessary, this process can be bypassed if so desired.
Range: 0, 7, or 128 If an invalid number is entered, it is accepted into the S-
Register, but S48 will act as if 128 has been entered.
Default: 7
S48=0 Disable negotiation; bypass the detection and negotiation phases; and
proceed with LAPM.
S48=7 Enable negotiation. (Default.)
S48=128 Disable negotiation; bypass the detection and negotiation phases; and
proceed at once with the fallback action specified in S36. Can be used to
force MNP.