The Central Module in the STAR Router: Decentralized Intelligence of the NEXUS System and Stand-Alone Matrix with Full Redundancy Option

The RCX card is the central unit in the NEXUS Star Router. It manages the device and provides the internal matrix with 4,096 x 4,096 crosspoints. External control systems can be connected to the NEXUS network via various interfaces. The RCX card can be redundantly equipped, which is what the safety concept of the NEXUS system is all about.

The RCX card is the central board of every NEXUS Star Router. It takes over the control and monitoring of all modules in it. Up to 16 I/O modules can be equipped per Star Router, 256 audio channels of which are exchanged with the RCX module. An audio matrix of 4,096 inputs to 4,096 outputs is implemented on the board for this purpose.

Similar to the XCPU boards for NEXUS Base Devices, the RCX router board also contains the NEXUS Logic Control responsible for this Base Device and is informed at all times about the overall status of the entire NEXUS system. For external control access, the card has two RS232/RS422 ports on the front panel, a USB port and an Ethernet interface. A computer with the NEXUS "Matrix 5" operating program or other control systems can be connected here.

It is possible to connect several controllers, also distributed on different routers and Base Devices, as well as a word clock input and an output at the front. In addition to this sync function, the Star Router can of course synchronize with the NEXUS system clock or generate it itself on the RCX card. In the unlikely event of an RCX board failure, a second board can be redundantly equipped. A simple push of a button on the front panel is all it takes to activate the switchover. There is no noise during switching, as the audio output is automatically muted for a short time.

Ethernet and USB Ports

The Ethernet and USB ports are designed for direct or network access with a PC. The Ethernet interface is also the point at which external control systems start to manage NEXUS parameters.

System State Fail-Safe Memory

A battery-buffered memory protects the entire system at all times.

Supports Redundant Operation

Redundancy operation in combination with a second RCX board is possible to protect the Star Router against a failure.

Extensive Internal and External Synchronization Options

The NEXUS system clock can be output via the BNC interfaces and the system clock can also be adjusted to synchronous sources.

Technical Specifications :


RCX_1 1 x 8TE
BNC 1x Wordclock output
BNC 1x Wordclock input
D-Sub 9 Buchse female 2x RS-232, RS-422 bidirectional
RJ45 1x IP bidirectional
USB 1x USB bidirectional

Technical Specifications


Type Motorola MCF547x
Clock rate Core: 200 MHz
Bus: 50/100 MHz

RS 232 Interface

Data rate 38.4 Kbps (typ.), 115.2 Kbps (max.)
Cable length 10 m (max., recommended)

RS 422/485 Interface

Data rate 38.4 Kbps (typ.); 115.2 Kbps (max.)
Input levels –7…12 V (max.)
I/O impedance 120 Ohm
Cable length 100 m (max.) over 110-ohm line; ±20 %

USB Interface

Version Compliant with USB 1.1, Type B; standard-compliant wiring, galvanically isolated
Data rate 12 Mbps
Cable length 5 m (max.) over 90-ohm line; ±15 %

Wordclock In

Level 1…5 V
Impedance 75/500 ohm (switchable)
Sample rates 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
Required wordclock-rate stability < ±150 ppm (±50 ppm typ., compliant with AES 11, Grade 2)

Wordclock Out

Level 2.4 V on RL = 75 ohm
Sample rates 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
Frequency stability ±10 ppm (max.), ±5 ppm (typ.) (internal generator)
  Output port adjustable to AC or DC (jumper-selected)

Ethernet (RJ 45)

Data rate 10/100 Mbps
Cable length 100 m (max.), CAT5e or better recommended

Operation Conditions

Temperature range 0° C to +50° C
Max humidity max. 90 %, non-condensing

Storage Conditions

Temperature range -35° C to +70° C
Max humidity max. 90 %, non-condensing

Power Supply

Voltage +4,75...5,25 V 
Currrent 1...3 A (depending on configuration)

Mechanical Data

Weight 0,27 kg 
Downloads :

NEXUS / NEXUS Star Technical Specifications




RCX Technical Specifications