xti03-front-4te4-channel Duplex Board for Transparent Forwarding of External Serial Data

  • Forwards RS 232, RS 422, RS 485, MIDI, DMX, and LTC data
  • Level and format conversion
  • Galvanic isolation of inputs and outputs

data sheet (191 KB)

The XTI board is designed for transparent forwarding of external serial data of the following formats over the NEXUS system, and makes all the necessary interface standards available:

  • RS 232
  • RS 422, RS 485
  • MIDI
  • DMX (RS 422/485)
  • Timecode, LTC
  • Dolby MetaDaten (RS 232 or RS 422)


A virtual cable through the NEXUS audio network is configured for free routing of external serial data on the system. The data is exchanged between two or more XTI boards and remains unchanged. I.e. the data is neither edited nor evaluated or otherwise modified.
In addition, the XTI serves as an interface for forwarding serial data from other boards (e.g. metadata from the XDED and XDEE Dolby boards or an XHDI board) to external devices. The board can also distribute timecode and MIDI on the system, and make them available to other boards.
The XTI board supports four duplex channels with independently configurable data formats. Each channel is galvanically isolated from both the NEXUS and other channels. Freely configurable routing between different outputs makes level conversion possible (for example, for routing an RS 232 input signal to an RS 422 output).
For higher data rates the software offers the option of doubling the transmission bandwidth. In this mode, twice the NEXUS bandwidth is allocated to each channel,thus doubling the data rate.
Each of the four electronically fused serial ports can be switched on or off independently. Two XTI versions are available: a 4-HP front panel with two serial ports, or an 8-HP version providing the maximum of four ports.

MIDI-, LTC- and DMX Data

Data complying with the MIDI specification can also be transmitted; however, for reasons of space, the physical connections are not implemented as standard 5-pole DIN jacks but as 9-pin D-Sub connectors. An isolated MIDI Thru signal is generated on the board.
The same applies to LTC timecode; here, too, the inputs and outputs are made available via 9-pin D-Sub connectors. For transmission of DMX serial data, the XTI should be run in double-speed mode due to the high data rate.


The four channels are made available on 9-pin D-Sub connectors. The pin-out depends on the application. (There are a total of seven configuration options.)


The front panel features 8 LEDs for indicating the channel status:

  • 1 green LED per channel indicating the RX traffic
  • 1 yellow LED per channel indicating the TX traffic

XTI 03 Specifications

Data formats RS 232, RS 422, MIDI, DMX, LTC
I/O ports
4 I/O ports (standard version)
2 I/O ports (compact version)
Pinout 9-pin D-Sub, female, proprietary or standard configurations
Dielectric strength
RS 232: ±25 V
RS 422: ±12 V
MIDI: ±10 V
LTC: ±5 V
Latency < 1 ms (dependent on the overall system)
Note The number and length of optical lines between two end points of a connection on the NEXUS system affect latency. A maximum data rate of 115.2 Kbps is recommended. (The double-speed mode should be enabled where higher rates are required.)
Data rate 125 kBaud (max.) @ fsample = 48 kHz
250 kBaud (max.) @ fsample = 48 kHz, double speed mode
RS 232
Output voltage: ±5.4 V, RL=3 kΩ
Input voltage: -25 to 25 V (max., recommended)
Input impedance: 5 kΩ
Cable length: 10 metres (max.) recommended
RS 422/485 Output voltage: 3.1 V, RL=100 Ω
Input voltage: -7 to 12 V (max., recommended)
Input impedance: 120 or 5 kΩ, jumper-adjustable
Cable length: 100 metres (max.) recommended @ Z0=110 Ω ±20 %
Output voltage: 4 V @ 5 mA
Input voltage: -10 to 10 V
ON input current: 5 to 15 mA (max., recommended)
OFF input current: 0.25 mA (max.)
LTC Output voltage: 1.5 Vpp, RL=1 kΩ
Input voltage: 0.5 to 5 Vpp
Input stability: 10 kΩ

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