JED Micro
Designers and manufacturers of audio/visual and industrial controllers in Australia

A/V ancillary devices

PIR T464 T462 relay box 12v Power pack  

As well as controllers, JED designs, builds or sells a number of ancillary devices for A/V system use. These compliment the controllers, can be used with different ones in various combinations, and can also be used with non-JED controllers as well.

(The communications protocols for RS232 devices are published, and are simple ASCII strings. Other devices just take relay, signal or logic levels.)

For JED audio devices, see: JED audio products


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PIR (Passive Infra-Red Detector)

All JED controllers have a relay contact input from a PIR (Passive Infra Red) detector in the room. This can be used for a reset of a time-out on the projector power, so that while people are in the vicinity the projector keeps running until manually turned off. Users can set a time-out period after which the projector automatically powers down if no activity is detected on the keyboard or via the PIR. The Run- time is adjustable from zero (disabled) to sixteen hours.

This option is intended for classrooms and theatres where manual turnoff might be missed, resulting in the A/V system being left running overnight or even over a holiday break.

(Note: This is not an Australian made product.)


T455 RS232 serial expander/multiplexer. Go to T455 page

The T455 allows an RS232 serial port to be expanded (e.g. on an audio-visual controller) to drive three RS232 serially-controlled target devices (multiple projectors, mixers, switchers, audio processors. One fixed input baud rate and format can drive each device at its individal baud rate and format.

Simple embedded commands steer the "connection" to the target devices.

In addition, two isolated relays and two N-FET drivers are available for control of screens, dippers, blinds or lighting from the master device.


T447 Projector Cable-top box

The use of the T447 allows very simple wiring of the A/V control environment: a single CAT5 cable is all that is needed through the wall to the T430, T440 or T460 at the operators location. A T447 box is installed up by the projector, and a single pre-terminated CAT5 Type A cable (non-crossover) interconnects the two boxes. The T430 and T440 have the CAT5 connector on the back. The T460 can also use the T447, with the eight wires being screwed into the Phoenix screw terminals on the back of the T460.

See: T447 diagrams and user notes.

Up at the projector, the following connections are made via plugs into the T447:

  1. A circular 2.1mm power connection matches the standard JED plug pack, PAK12-1A. Thus power plugs straight in and is taken to the T440 via the CAT5 cable;
  2. A 4-pin Phoenix screw terminal connector allows the PIR to be wired in here, with 12 volts fed to the PIR and the relay contact output taken to the T440 via the CAT5 cable;
  3. A D9 male socket provides a connection point for a short patch-cable to the display device. JED normally supplies this cable to order, and the price is included in the T447 list price. This connection has Tx out on pin 3, Rx in on pin 2 and Gnd on pin 5, i.e. the same as a PC COM port; and

  4. The CAT5 cable connector to the T440 at the other end (RJ45).

The T447 also provides Tx and Rx line LED monitors with pulse stretchers so that signal communications in both directions with the display are shown to installers.


T462 RS232 controlled dual/quad relay controller

The T462-R2 and T462-R4 are boxed RS232 relay drivers which can be driven from a T460R or a T440 via the second serial port in the same way as the T461 relays (above) are. The first two relays are programmed from the T460R to lower and raise a motorised screen. The relays can switch 5 or 12 volt signals to the motor control system. (If only screen control is needed, use just the T462-R2). JED can supply a 12v 1Amp power pack to run a T460R/T462 pair. Order PAK12/1A, see below.

If scissor-jack and room light dimming relays are needed as well, order a T462-R4, with four relays.

Note: The T462 is an electrically isolated relay device, which is needed if the screen device and the controller device do NOT share a common connection for contact closure. ScreenTechnics screens and older Somfy screens (using the CD4 controller) are ground-voltage switched, i.e. contact closure to ground signals a "screen down" or "screen up" action. Thus a T462R2 or R4 is NOT needed with these screens and screen controllers and a T460R-R4 (adding the -R4 "relay option to the T460R) or the T440, as these have a solid-state N-Channel FET device simulating a relay, but not via isolation.

However, if you are using the latest Somfy screen controller, you will need the T462-R2 or -R4 as the new Somfy controller has its "common" raised 13.6 volts above the "common" or "ground".


T462-R2 Opto In

The T462-opto-12 is an interface from projectors with a 12-volt screen drive output to enable these projectors to interface to screen controllers which need one contact closure to take the screen down and another contact closure (on a different line) to take the screen back up. The 12 volt input is opto-isolated from the controller common. It needs a 12 volt power supply like the PAK12-1A below.

(It does NOT have an RS232 interface, being solely driven from the projector's 12 volt "screen" signal.)


USB switchers, 439, 443        Go to USB switchers

The JED 439 (top photo) is a 2-channel USB switcher typically for use in a classroom where two sources of USB signals need to control one device, e.g. an Electronic Whiteboard (EWB).

The JED 443 (lower photo) is a three-channel version of it.

The JED switchers are controlled remotely from an A/V controller such as JED's T430, T440 or T460R, but can be controlled by any external device which can generate one, two (or three) contact closures to ground or simple ASCII RS232 control commands.

They can also be used in a manual mode via a front panel toggle switch (A/B) (or Select switch, 443) or in "Auto" mode where the act of plugging in a channel B cable switches the USB output to Channel B, but it reverts to Channel A when the Channel B USB is powered down or unplugged. (In the 443, Channel C has the highest priority.) So, in a classroom, the act of plugging in a teacher's laptop steers the USB connection to that laptop.


Plug pack power supply: PAK12-1A   

This 12 volt, 1 Amp small switching regulated plug pack powers many items of JED equipment. It is a very low noise device and has low standby current as well. It is designed for Australian and New Zealand power point standards, but equivalent units are available around the world to meet other standards.

(Note: This is not an Australian made product.)


Projector Hub: 448 ... device for driving multiple displays from one controller

The projector hub buffers the RS232 signal from a controller, so that one controller can drive the RS232 inputs of up to eight display devices. (Each RS232 output from a controller can drive two RS232 loads, by the standard RS232 drive definition, so the four buffers in this device can thus each drive two displays, so one hub can drive eight displays.)

One controller can drive two of these hubs, so with two hubs, sixteen displays can be driven. (Note: This device is simply a buffer ... there is no individual decoding by device ... all devices get the same commands in parallel.)

Applications might be in schools, libraries, cinemas, pubs, clubs, TABs etc where multiple screens need to be turned on or off or sent a common "set source" command, all to act together. 448 User notes.


Mounting bases, wall mount or 45 degree mount

JED controllers are physically based on the Australian/NZ power point standards, particularly the Clipsal 2000 series. The 449A is a moulded mounting block 122mm long, 78mm wide and 32mm deep. The T430/T440 and T460R controllers all can screw onto this base and mount on a masonry wall with rear or side, top or bottom cable entry.

These bases are available from JED in white, black or "metallic" (to suit the T460R-M or T440 code B-M metallic-finished controllers.)

The lower photo shows a 45 degree metal housing manufactured by JED to mount JED controllers. This four-piece assembly can be used in standard (bottom cable entry) mode or inverted (rear cable entry) mode. These modes both hold the controllers at 45 degrees to the operator's desk or wall for good visual alignment with the display. The standard mode is used where the controller is bolted on top or a desk or cabinet with cables through the base. The rear entry mode allows it to be bolted to a wall at a lower level than the operator's eye-line.

These metal units are available in powder-coated white, black or bare (for installers to paint any colour they desire.)



The LCD timer shown here provides programmable start and stop times to an A/V system controlled by a JED T440 or T460R.

Up to eight times can be set per day, and it can be programmed for all or certain days of the week. The timer contact output feeds directly into the control input on the back of the JED controllers. When the timer contact closes, the JED controllers send a start command to the display device and set a source channel. When the contact opens, the display device is sent a stop command

The T460R controller can be programmed to send messages to other devices on start-up and close-down, e.g. an RS232 controlled DVD or disk-based media player or other signal source. (These messages are entered as ASCII or hex strings using EEPROM editing mode of "setup"). The timer is available in 12 volt and 240 volt powered versions.

Applications are anywhere where automatic starting and stopping of A/V and display systems is needed: obvious examples are museums, art galleries, wineries, school or college or library display "notice boards", retail, shop windows, etc.

(Note: This is not an Australian made product.)


Go to the main A/V page for all JED controllers: JED A/V controllers

For JED audio devices, see: JED audio products