Alf FDAT-TX User manual

Electrostatic Discharge: The product can be damaged by electrostatic
discharge, thus care must be taken when handling the product. Failure to
observe proper handling and installation procedures can cause damage.
Electrostatic Discharge damage can range from performance degradation
to complete product failure.
Important Safety Instructions
Please follow these precautions when using this product:
Read these instructions. Keep these instructions. Heed all warnings. Follow
all instructions.
WATER AND MOISTURE: Designed for indoor use only. The product is
not protected against liquids. It should not be exposed to dripping or
splashing and no objects filled with liquids, shall be placed on the product.
INSTALLATION: The product must always be installed by qualified service
personnel. Install in accordance with the manufacturer's instructions.
Always disconnect the supply power before installing the product. Do not
install near any heat sources such as radiators, heaters, or other apparatus
that produce heat.
POWER SOURCES: The product should be connected to a power supply
only of the type described in the operating instructions or as marked on
the unit.
SERVICING: Contains no user serviceable parts. Do not attempt to repair
the product, as this will void the warranty.
FUSING: Never bypass or use any other type of fuse. Replace only with
the same type of fuse as found in the operating instructions. Fuses must
only be replaced by qualified service personnel. Always disconnect from
power before replacing fuses.

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installer thereof provides a separate warranty, in which event the End user have to exercise his right and claim
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and/or installer are liable in their respective capacities.
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described in it.
Copyright © 2004 Alf Electro-Technical Services CC. All rights reserved.
Product Name: FDAT-EN1 Release 1 FDAT-TX Transmitter
FDAT-RX Receiver
Release Date: January, 2004
Contact Information
Alf Electro-Technical Services CC t/a Alf-Tech
Corporate Headquarters
Address (Physical): 30 Irene Ave., Somerset West, 7130, CAPE, South Africa
Address (Postal): PO Box 1718, Somerset West, 7129, CAPE, South Africa
Telephone: [phone]
Fax: [phone]
E-Mail: [email protected]
Marketing, Sales & Technical Support
Telephone: [phone]
Fax: [phone]
E-Mail: [email protected]
WWW:www.alftech.com
UsersManual
FIBRE
DIGITAL AUDIO
TRANSCEIVER
CONTENTS
SECTION 1 1
Introduction 1
FDAT-TX EN1 1
FDAT-RX EN1 1
FDAT-EN1 Transceivers Specifications 2
Recommended Operating Conditions 2
Absolute Maximum Ratings*2
Electrical Characteristics 3
Detailed Pin Descriptions -Transmitter 4
Detailed Pin Descriptions –Receiver 4
Physical Layout and Dimensions 5
Alf Electro
-
Technical Services C.C.
(Reg. No.: CK1999 05574/23)
PO Box 1718
Somerset West
7129, CAPE
South Africa
www.alftech.com

1
SECTION 1
Introduction
Product Overview: Fibre Digital Audio Transceiver
FDAT-TX EN1
The FDAT-TX unit transmits audio and 24 digital inputs to the
RX unit. The unit receives a balanced audio input and
converts it to digital format. This digital signal is combined
with the 24 digital inputs, and then transmitted via fibre-
optic transmission to the RX unit. The inputs are active
HIGH. As an example, the Inputs can be connected to relay
outputs or directly to switches.
The LED level indicator
must be used to set the
input audio to the
appropriate level, to
prevent overdriving the
analog-to-digital
converter. The audio
input has another 6 dB
headroom from the time
when the RED 0 dB LED
lights up, before the
audio output on the RX
unit will clip.
FDAT-RX EN1
The FDAT-RX unit receives the data via the fibre-optic, and
separates the audio data from the digital input data. The
audio signal output is via a balanced line output. The digital
outputs have a transistor pull down output.
If a relay is used, it must be connected between the output
and the 24 V supply. If
the fibre is not
connected, or there is a
fault with the TX unit,
the outputs will all be
off, and the SYNC LED
will be OFF. The fault
output line will be ON
(pulled down) in a fault
condition.
the FDAT Transmitter
the FDAT Receiver
2
HARDWARE FEATURES
•Hardware Features
•Single channel balanced audio
•24 inputs to transistor pull down outputs
•Line Fault transistor pull down output on RX
•Audio level indicator for setup on TX
•RS-485 data transmission from TX to RX
Transmitter Connections
•24 V DC supply input
•24 inputs
•RS-485 input
•Balanced audio line-in
•Optic Fibre output
Transmitter Indicators
•Power LED
•5 Input level Indicator LED's
Receiver Connections
•24 V DC supply input
•24 pull down transistor outputs
•RS-485 output
•System fault pull down transistor output
•Balanced audio line-out
•Optic Fibre input
Receiver Indicators
•Power LED
•Data SYNC LED
FDAT-EN1 Transceivers Specifications
Recommended Operating Conditions
(0° C to + 55 °C)
PARAMETER CONDITION MIN TYP MAX UNITS NOTES
Supply Voltage 14 24 30 V6
Signal Input Voltage 024 V1,6
Absolute Maximum Ratings*
Voltage on V Supply, Relative to Ground 0V to +34 V
Voltage on Signal input pins, Relative to Ground –60 V to +60 V
Operating Temperature 0 °C to +70 °C
Storage Temperature 5 °C to +55 °C
*Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.

3
Electrical Characteristics
(Over the Operating Range)
PARAMETER CONDITION MIN TYP MAX UNITS NOTES
Supply Current 24 V DC –TX unit 125 mA
24 V DC –RX unit 75 mA 7
Power Consumption 12 V to 32 V –TX unit 3W
12 V to 32 V –RX unit 1.8 W7
Signal input Current 24 V input 1mA
Signal input resistance 22 kΩ
HIGH level Trigger Voltage 21 V1
LOW level Trigger Voltage 3V1
Signal input to output delay 12 ms 5
RS-485 input to output delay Optional 40 us
RS-485 baud rate Optional 09600 baud
Audio Input and Output Level 0 dB LED turns ON -3dBu 2
Audio Headroom 6dB 3
Audio sample rate 43 kHz
Audio resolution 20 Bits
Audio Output Resistance Hot or Cold to Gnd 22 Ω
Frequency Response 16 H z to 16 kHz ± 1.5 dB 4
Signal-to-Noise Ratio 0 dBFS digital 90 dB 4
Total Harmonic Distortion 0 dBFS digital 0.006 %4
Signal output Current Transistor output pull down 500 mA 8,9
Notes
1. The Signal input voltage should never be allowed to be between the maximum LOW-
level, and the minimum HIGH-level input voltage.
2. The input and output level are between the hot and cold terminals. Peak-to-Peak voltage
is 0.775 V, with RMS voltage 0.548 V.
3. Extra output level available before the output clips after the input level has reached the 0
dB level. Thus the output will clip at +3 dBu with Peak-to-Peak voltage of 1.55 V and
RMS voltage of 1.095 V.
4. These parameters are characterized but not tested.
5. Delay from when the TX unit received an input, until the RX unit's output switches ON or
OFF.
6. Power supply and all Signal inputs have reverse voltage protection on TX.
7. The current is the supply current through the +24 V supply line. If all outputs are ON,
the supply current should increase by less than 10 mA. This is because the relay outputs
are pulled down, thus the relay current goes through the GND terminal.
8. The relay outputs are in 3 banks of 8 outputs each. If all 8 outputs per bank are ON
permanently, they are each allowed to draw only 125 mA. Only use 24 V relays, with a
resistance of more than 200 ohm.
9. Each relay output has a 22 k pull-up resistor and a protection diode connected directly to
the 24 V supply.
Caution
The output transistors do all have diode protection, but the outputs can still be damaged if
care is not taken. When a relay is disconnected while an output transistor is on, and the
relay has no diode directly connected to it, the relay will generate a high voltage oscillation,
arcing over the point where contact was broken. This reverse voltage will flow back to the
transistor and damage it.
4
Detailed Pin Descriptions -Transmitter
Pin
Number
Description
COMPONENT SIDE
Pin
Number
Description
TOP CONNECTOR
Pin
Number
Description
BOTTOM CONNECTOR
1Ground 1Input 1 1Input 13
2+24 V Supply 2Input 2 2Input 14
3RS-485 Ground 3Input 3 3Input 15
4RS-485 IN Hot 4Input 4 4Input 16
5RS-485 IN Cold 5Input 5 5Input 17
6Audio Ground 6Input 6 6Input 18
7Audio IN Hot 7Input 7 7Input 19
8Audio IN Cold 8Input 8 8Input 20
9Input 9 9Input 21
10 Input 10 10 Input 22
11 Input 11 11 Input 23
12 Input 12 12 Input 24
Detailed Pin Descriptions –Receiver
Pin
Number
Description
COMPONENT SIDE
Pin
Number
Description
TOP CONNECTOR
Pin
Number
Description
BOTTOM CONNECTOR
1Ground 1Output 1 1Output 13
2+24 V Supply 2Output 2 2Output 14
3RS-485 Ground 3Output 3 3Output 15
4RS-485 OUT Hot 4Output 4 4Output 16
5RS-485 OUT Cold
5Output 5 5Output 17
6Audio Ground 6Output 6 6Output 18
7Audio OUT Hot 7Output 7 7Output 19
8Audio OUT Cold 8Output 8 8Output 20
9Output 9 9Output 21
10 Output 10 10 Output 22
11 Output 11 11 Output 23
12 Output 12 12 Output 24

5
Physical Layout and Dimensions
FDAT-EN1 all Dimensions in mm
6
NOTES
Copyright © 2004Alf Electro-Technical Services CC. All rights reserved.