Specifications

Chapter 1 – AT Commands, S-Registers and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI/MT5656SMI Reference Guide (S000306B) 28
Command: +MR Modulation Reporting Control
Description: This extended-format numeric parameter controls whether or not the
extended-format +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 rate will be used,
i.e., before any Error Control or Data Compression reports are transmitted,
and before any final result code (e.g., 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).
Default: 0
Defined Values: +MR0 Disables reporting of modulation connection (+MCR: and +MRR:
are not transmitted).
+MR1 Enables reporting of modulation connection (+MCR: and +MRR:
are transmitted with TX rate, RX rate).
+MR2 Enables reporting of modulation connection (+MCR: and +MRR:
are transmitted with RX rate only).
Report Commands: +MR? Reports the current value.
+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
K56 For K56flex
+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.
Example: +MRR: 28800, 48000