CHAPTER 2: AT Commands
29
2.9 Modulation Command
Command:
+MR
Modulation Reporting Control
Description:
This extended-format numeric parameter controls whether or not the
extended-MCR:<carrier> and +MRR:<rate> intermediate result
codes are transmitted from the modem to the DTE. If enabled,
+MCR:<carrier> and +MRR:<rate> intermediate result codes represent
the current (negotiated or renegotiated) modulation <carrier> and
<rate> that are transmitted at the point during connect negotiation
(handshaking) at which the modem has determined which modulation
and data rate will be used. This happens before any Error Control or
Data Compression reports are transmitted and before any final result
code (for example, CONNECT) is transmitted.
S95 bit 2 is reset to 0 for +MR=0 and is set to a 1 for +MR=1 or +MR=2.
The more recent setting of +MR or S95 bit 2 and the W command
setting determines modulation result code reporting (see S95
Parameter and W Command).
Syntax: +MR=[<value>]
Values:
<value> A decimal number corresponding to the selected option:
0
Disables reporting of modulation connection (+MCR: and
+MRR: are not transmitted). Default.
1
Enables reporting of modulation connection (+MCR: and
+MRR: are transmitted with Tx rate, Rx rate).
2
Enables reporting of modulation connection (+MCR: and
+MRR: are transmitted with Rx rate only).
Report Commands:
+MR?
Reports current or selected values.
+MR=? Reports supported range of parameter values.
+MCR: Report Syntax:
Response: +MCR: <carrier>
<carrier> Alphanumeric code corresponding to the reported carrier.
Defined values are:
B103 for Bell 103
B212 for Bell 212
V21 for V.21
V22 for V.22
V22B for V.22bis
V23C for V.23
V32 for V.32
V32B for V.32bis
V34 for V.34
V90 for V.90
V92 for V.92
+MRR: Report Syntax:
Response: +MRR: <tx_rate>,<rx_rate>
<tx_rate> Decimal transmit rate in bits/s.
<rx_rate> Decimal receive rate in bits/s.
Содержание MD1650A-JP
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