Audio-Data  matrices


Audio-Data  matrices


The Ro.Ma. enginery Audio-Data Matrices are used in the radiocommunication system to interface the transmitting and receiving audio/data channels to the operator consoles,  providing a capability to switch a number of input signals to a number of outputs. All the matrices are of “no blocking” type, i.e. each output has independent access to any input irrespective of the number of outputs being connected to the same input.  Modular design allows different configurations with various numbers of inputs and outputs, as required.


Main features:                                                                                                                                                       

  • Full non-blocking switch function

  • Flexible equipment configuration

  • Customer specified impedance

  • RS232, LAN 10/100 (optional) and local control

  • Options: balanced or un-balanced signal interface

  • Redundant CPU (only for MR-413-1)

  • Touch Screen Display (only for MR-413-1)

Audio Matrix MR-496-1 & MR-413-1 (32x32)

The MR-496-1 and MR-413-1 provides switching of 32 input lines into 32 output lines , combining in the same matrix capabilities for switching both audio and RS-232 data lines, a characteristic which allows a very versatile use of this equipment.

The matrix is controlled by a microprocessor card (two CPU on MR-413-1) outfitted with a programmable RS-232 serial line. The matrix is of no-blocking type, i.e capable of switching any input simultaneously to all the 32 outputs, control can be local by use of a dedicated keyboard (Touch screen on MR-413-1) or remote  over a RS-232/485/422 serial line. Optionally, an additional  32 x 32 PTT Matrix  can be associated with the MR-496-1 or MR-413-1 to obtain independent Audio/Data and PTT switching facilities.


The MR-496-1 & MR-413-1 configuration includes:

  • qty 1 CPU card for control and monitoring (2 on MR-413-1),  also used for the RS-232/485 serial  communication and to the management of the additional 32 PTT input signals

  • qty 4 Audio/Data matrix cards, 32 inputs, 8 balanced outputs

  • qty 2 input cards for the termination of the input balanced lines

  • qty 1 optional card for the management of the PTT output signals

  • qty 1 power supply

  • qty 1 keyboard and LCD display (Touch screen on MR-413-1) for local control of the matrix nodes and status monitoring

  • qty 1 19” standard rack, 3 units.

The matrix is all solid state with a modular structure which allows replacement of modules during operation (with the only exception of the CPU card and front panel, not for the MR-413-1)  and down-sizing of the matrix switching capabilities, if required.  The matrix can be connected to 600 Ohm balanced lines and to balanced/unbalanced data lines at data rates up to 100kbit/sec.

All the interconnections are flat cables terminated with connectors, all inputs and outputs are protected against over voltage and over current conditions.


                            Technical characteristics

Input lines


Output lines


Input - Input  isolation

> 70 dB

Output – Output isolation

> 70 dB

Switching time ( audio)

< 10 mS

Input/output impedance

600 Ohm nominal, high impedance programmable

Input level

+ 20 dBm max


1% max

Optional PTT inputs

32 opto-isolated

Optional PTT outputs

32 opto-isolated, 100 mA sink

Communication protocol

STX / ETX  dedicated

Communication interface

RS 232- RS 485, 4/2 wires Dip Switch programmable

Primary power

220Vac / 115Vac


19” Standard Rack 3 U , depth 357 mm

Operating temperature

0°C to +50° C, extension to -20°C to+50 C° upon request (LCD excluded)

Redundant CPU Only for MR-413-1
5.7" Color Touch Screen Only for MR-413-1



  Ro.Ma. Enginery - Via Costarica n.6 - 00040 Pomezia Roma - ITALY -                                                            Tel.: +39069112483-+390691604670 Fax: +390691141867 e-mail: