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Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 101
Command:
+A8I CI Signal Indication (Not available in V.22bis)
This indication is issued by an answering modem, if +A8E,<v8a> does not equal 0, to
indicate detection of a V.8 CI signal, and report the recovered Call Function octet(s).
Indication Syntax: +A8I:<v8cf><CR>
Example
+A8I:0 The modem timed out waiting for CI.
+A8I:X YYY
Command:
+DR Data Compression Report (Not available in V.22bis)
Values: 0, 1
Default: 1
Description: This extended-format numeric parameter controls whether or not the extended-format DR:
intermediate result code is transmitted from the modem to the DTE.
S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more recent setting of
+DR or S95 bit 5, and the W command setting, determines the actual data compression
result code reporting (see S95 Parameter and W Command).
+DR0 Data compression reporting disabled (no +DR result code transmitted).
+DR1 Data compression reporting enabled (+DR result code transmitted).
Reporting Current or Selected Values
Command: +DR?
Reporting Supported Range of Parameter Values
Command: +DR=?
+DR: <type> Intermediate Result Code
The +DR: <type> reported represents the current (negotiated or renegotiated) modem-
modem data compression type. If enabled, the intermediate result code is transmitted at the
point after error control negotiation (handshaking) at which the modem has determined
which data compression technique will be used (if any) and the direction of operation. The
+DR intermediate result code, if enabled, is issued after the Error Control Report (+ER) and
before the final result code (e.g., CONNECT).
Command:
+DS Data Compression (Not available in V.22bis)
Values: 0, 3
Default: 3
Description: This extended-format compound parameter controls the V.42bis data compression function
if provided in the modem. It accepts four numeric subparameters:
<direction> Specifies the desired direction(s) of operation of the data compression
function from the DTE point of view.
+DS0 Negotiated; no compression (V.42bis P0=0).
+DS3 Both directions, accept any direction (V.42bis P0=11).
<compr_neg> Specifies whether or not the modem should continue to operate if the
desired result is not obtained.
+DS0 Do not disconnect if V.42bis is not negotiated by the remote
modem as specified in <direction>.
<max_dict> Specifies the maximum number of dictionary entries (2048 entries) which
should be negotiated (may be used by the DTE to limit the code word size
transmitted, based on its knowledge of the nature of the data to be
transmitted).
<max_string> Specifies the maximum string length (32 bytes) to be negotiated (V.42bis
P2).
Reporting Current or Selected Values
Command: +DS?
Reporting Supported Range of Parameter Values
Command: +DS=?