Gilderfluke&Co Frequency Shift Keyed/Remote Terminal Unit - Manual (Page 6)

C) Six LEDs Indicate:
1) Heartbeat: Flashes continuously while the CPU is running. If it ever stops for more than
a second or so, the ‘Deadman’ circuit in the FSK/RTU unit will automatically reset the
CPU.
2) Data received: Turns on when valid data is received from the FSK or DMX-512 input as
appropriate).
3) Data errors: Flashes for a moment whenever an error is detected in the FSK or DMX-
512 input (as appropriate). When operating in the FSK mode, excessive data errors in-
dicate that the tape is getting too worn to reliably play back a show. When sending a
string to a serially controlled device, it will flash when an unexpected character is re-
ceived.
4) Stop relay output activated: Lights when this tape deck control output is activated.
5) Play relay output activated: Lights when this tape deck control output is activated.
6) Rewind relay output activated: Lights when this tape deck control output is activated.
D) RS-422 Port used for accessing and modifying configuration of the FSK/DMX unit and for
sending commands to serially controlled devices like LaserDisk and Compact Disc players.
E) LED Indicators for all Digital, Analog and Fuse outputs (Optional).
On the back side of the FSK/RTU are connectors for:
A) Power Supply: The power supply input is used to feed a voltage between 12 and 24 Volts
Direct Current (VDC) to the FSK/DMX Unit. The voltage input must be 18 volts or greater if the
analog output option is installed.
The size and voltage of the power supply is determined by the load you are connecting to
it. In most cases a power supply in the 100 to 200 Watt range will be sufficient to drive most
shows. The polarity of these connections is plainly marked. The RTU/FSK unit itself draws about
350 ma. at 24 volts. With all of the indicator LEDs on the front of the unit, this can get as high
as 1 amp.
B) Tape Deck Control: These provide three normally open contact closures which can be con-
nected to the remote control inputs on a tape deck (or Compact Disc, LaserDisk player or
other audio source if you aren’t going to control it through its serial port).
The 'Play', ‘Rewind’ and 'Stop' outputs normally go the the 'Play', ‘Rewind’ and 'Stop' inputs
on a tape deck. As the system doesn't support a foil sensor input, the tape deck must be able
to take care of itself when it is given a rewind command. Since a cassette tape can't ever
come off the end of the reel, any cassette deck with remote control inputs will work. An open
reel tape deck can be used if it has a 'Home' function which can be attached to the 'Rewind'
output on the FSK/RTU. This will tell the tape deck to rewind and stop at the zero point set on
the tape counter.
C) Frequency Shift Keyed (FSK) Data Input: If FSK data is used, the FSK Data input is attached to
wherever it is coming from. This is usually the output of the data track on a tape deck,
Compact Disc or LaserDisk player. The FSK/RTU decodes the FSK data input and sends it to the
outputs. The standard FSK data rate sends out sixteen channels of data at fifteen frames per
second. At the higher FSK data rate (FSK/RTU must be factory modified to support this option),
data is limited to fifteen frames per second if transmitting thirty-two channels of data, or thirty
frames per second if transmitting sixteen channels of data.
D) DMX-512 Data Input: The DMX-512 standard was developed by the United States Institute for
Theatrical Technology (USITT) for a high speed (250 KBaud asynchronous) serial link. Although it
was originally designed for controlling light dimmers, it is now supported by hundreds of suppli-
ers throughout the world for controlling all kinds of theatrical equipment.
Even though the DMX-512 standard calls for 512 channels of data, the DMX transmission
from PC•MACs is limited to 256 eight bit wide channels. You can address the FSK/RTU to re-
spond to any address between 00 and 512. Addresses above the 256th are used in PC•MACs
G ILDERFLUKE & C O . • 205 S OUTH F LOWER S T . • B URBANK , C ALIF . 91502-2102 • 818/840-9484 • FAX 818/840-9485
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