Chapter 2 – AT Commands

Command: +IPR

Fixed DTE Rate

Description:

This numeric extended-format parameter specifies the data rate at which the modem will

 

accept commands during online operation. It may be used to select operation at rates at

 

which the modem is not capable of automatically detecting the data rate being used by the

 

DTE.

 

Specifying a value of 0 disables the function and allows operation only at rates

 

automatically detectable by the modem. The specified rate takes effect following any

 

issued result code(s) associated with the current command line.

 

The <rate> specified does not apply in OnLine Data State if Normal Mode (Direct Mode) of

 

operation is selected.

 

Syntax: +IPR=<rate>

Values:

<rate> Specifies the DTE-modem interface operation rate in bits/s. The available rates

 

are: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400.

 

If unspecified or set to 0, automatic detection is selected and the character format is also

 

forced to auto detect. +ICF=0.

 

If the specified rate is not supported by the modem, an ERROR result will be returned.

Report Commands:

+IPR? Reports current or selected values.

 

+IPR=? Reports supported range of parameter values.

Modulation Command

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).

 

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.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)

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Multi-Tech Systems MT5600BA-V92 Modulation Command, Command +IPR Fixed DTE Rate, Command +MR Modulation Reporting Control

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