Description
Description: Relay Control Over Audio
Download Specifications
Download Instruction Manual
Download Related Article
Part Number: SCT/SCR-8
Title: Alarm Relay over Audio System
Category: Digital Products
Industry:TV/Radio Broadcast, CATV Cable Industry,
This device transmits relay contact control and alarm signals over any digital or analog audio link. The control signal is encoded in the audio channel prior to digitizing so it works with all digital compression systems.
This unit can be used with any existing audio programming to provide contact command and control information carried on the audio signal itself. Use this on your (STL) Studio To Transmitter Link or microwave system to send and receive contact information for remote control and telemetry from your transmitter site or any remote facility.
Contact closures at the SCT-8 transmitter input will be repeated as relay contact closures at the SCR-8 receiver output. The unit can be ordered with supervised resistance contact input/outputs.
The SCT-8 SUPERVISORY CONTROL TRANSMITTER and the SCR-8 SUPERVISORY CONTROL RECEIVER together make up an 8 channel alarm and control system. The transmitter unit uses a small portion of the 19KHz spectrum in the audio to insert coded contact information. At the other end of the audio link the receiver decodes the contact information and then removes the coded signal from the audio.
As many as 8 Transmitters and any number of receivers may be placed on one audio signal to give you up to 64 contact alarms. There is a separate system alarm contact on the receiver that will operate upon loss of power to the transmitter terminal or loss of transmission path audio link failure. This system can be used with existing audio in the 19KHz mode, or use it without audio in the 1.5KHz mode. These two modes of operation will give you maximum flexibility with your installation.
If this product page shows “out of stock” the product is in production and can be purchased with a lead time of 1-2 weeks or less depending on quantity. To place an order for this product call 1-800-235-6960 and ask for the sales department. Or E-Mail your order to fmsystemsinc@sbcglobal.net. Most orders ship within a few days.
SPECIFICATIONS: SCT-8 (Transmitter)
CONTACT INPUT, SPECIFICATIONS
Channels, 8 Channels (Current Loop 2mA)
Connectors, 20 Pos. Screw Terminal
Alarm Sense, Contact closure (Loop)
Max Loop Resistance, 1K ohm (Supervised Optional)
Modulation Frequency, 19KHz or 1.5KHz (Field Selectable)
AUDIO INPUT
Level, 0 dBm
Maximum Level, +18dBm
Impedance, 20K Ohm (HI-Z Balanced)
Connector, Screw Terminal
AUDIO OUTPUT
Level, 0 dBm
Distortion, > 0.01 THD.
Maximum Level, +18dBm
Impedance, 600 Ohms (LO-Z Balanced)
Connector, Screw Terminal
SCR-8 (Receiver)
CONTACT OUTPUT SPECIFICATIONS
Channels, 8 Channels (Relay Output)
System Alarm, Normally Open Relay Contact
Connectors, 20 Pos. Screw Terminal
Receiver Frequency, 19KHz or 1.5KHz (Field Selectable)
AUDIO INPUT
Level, 0 dBm
Maximum Level, +18dBm
Impedance, 20K Ohm (HI-Z Balanced)
Connector, Screw Terminal
AUDIO OUTPUT
Level, 0 dBm
Distortion, > 0.01 THD.
Maximum Level, +18dBm
Impedance, 600 Ohms (LO-Z Balanced)
Connector, Screw Terminal
MECHANICAL (each)
Size, 9.00″L X 4.5″W X 3.0″D
Power, 24 VAC 200 mA
SCR-8 (Receiver)
CONTACT OUTPUT SPECIFICATIONS
Channels, 8 Channels (Relay Output)
System Alarm, Normally Open Relay Contact
Connectors, 20 Pos. Screw Terminal
Receiver Frequency, 19KHz or 1.5KHz (Field Selectable)
AUDIO INPUT
Level, 0 dBm
Maximum Level, +18dBm
Impedance, 20K Ohm (HI-Z Balanced)
Connector, Screw Terminal
AUDIO OUTPUT
Level, 0 dBm
Distortion, > 0.01 THD.
Maximum Level, +18dBm
Impedance, 600 Ohms (LO-Z Balanced)
Connector, Screw Terminal
MECHANICAL (each)
Size, 9.00″L X 4.5″W X 3.0″D
Power, 24 VAC 200 mA
SPECIFICATIONS: SCT-8 (Transmitter)
CONTACT INPUT SPECIFICATIONS
Channels, 8 Channels (Current Loop 2mA)
Connectors, 20 Pos. Screw Terminal
Alarm Sense, Contact closure (Loop)
Max Loop Resistance, 1K ohm (Supervised Optional)
Modulation Frequency, 19KHz or 1.5KHz (Field Selectable)
AUDIO INPUT
Level, 0 dBm
Maximum Level, +18dBm
Impedance, 20K Ohm (HI-Z Balanced)
Connector, Screw Terminal
AUDIO OUTPUT
Level , 0 dBm
Distortion , > 0.01 THD.
Maximum Level , +18dBm
Impedance, 600 Ohms (LO-Z Balanced)
Connector, Screw Terminal
SCR-8 (Receiver)
CONTACT OUTPUT SPECIFICATIONS
Channels, 8 Channels (Relay Output)
System Alarm, Normally Open Relay Contact
Connectors, 20 Pos. Screw Terminal
Receiver Frequency, 19KHz or 1.5KHz (Field Selectable)
AUDIO INPUT
Level, 0 dBm
Maximum Level, +18dBm
Impedance, 20K Ohm (HI-Z Balanced)
Connector, Screw Terminal
AUDIO OUTPUT
Level, 0 dBm
Distortion, > 0.01 THD.
Maximum Level, +18dBm
Impedance, 600 Ohms (LO-Z Balanced)
Connector, Screw Terminal
MECHANICAL (each)
Size, 9.00″L X 4.5″W X 3.0″D
Power, 24 VAC 200 mA
