Museum Technology Source 4321 User Manual

2 Component
System with Display
and Control

4321 Count Down Timer

For presentations that start on a regular cycle, the 4321 provides an easy
method to automatically start the show, as well as to indicate to the wait­ing public how long it will be before the next show starts.

The 4321 consists of two components: the control unit, and the display.
The control unit may be installed where most convenient, usually next to
the equipment to be started, while the display, with its two 4 inch high
digits, may be be mounted for optimal visibility to the public.

In operation, the control unit is preset with the desired intermission time.
When placed in run mode, the remote display will display the preset
time, and proceed to count down, in one minute increments, to zero.
When zero is reached, a relay in the control unit closes for one second.
This contact is used to activate show control equipment, such as DVD or
audio control units.

For venues with multiple entrances, multiple displays may be employed.
The display units are merely connected in parallel. The RS-485 data
transmission technique used, allows the displays to be hundreds of feet
apart if required.

Several modes of operation are available, set by DIP switches on the rear
panel.

Can be mounted in
any custom exhibit

Easily Adaptable

Switches provide
several modes of
operation

Additional displays
can be used for mul­tiple entrances

323 Andover Street Wilmington, MA, 01887
800-729-6873 / 978-657-3898 Fax: [phone]
www.museumtech.com / [e-mail]

Starts show and
notifies public when
the next show will
start

Revised 1/03

Museum Technology Source, Inc.

Display section with 4 inch digits

Control Unit

4321 Count Down Timer

Technical Specifications

Display

Time Range

Operating Modes

Start Input

Relay Output

Display Connection

Power

Controls

Display Physical

Control Physical

Included Accessories

Optional Accessories

Two digit, 4 inch high LED. Red standard; green available

1 to 99 minutes in 1 minute increments

a) counts down continuously; upon reaching zero reverts to
present number and starts counting down again. b) counts
down as long as contact is maintained across start terminals.
c)Starts counting upon momentary contact across start terminals.
d) same as (c) but if momentary contact while counting will
cause display to revert to preset count

Optoisolated input. Start switch must be capable of switching
12 VDC @20mA. Screw terminals on plugable block

SPDT relay rated at 2 Amps, 24 VDC. Activates for 1 second.
three screw terminals on plugable block

4 wires; 2 for RS-485 data; 2 for 12 VDC power @ 700mA

Supplied 15 VDC 900 mA external power supply. Sufficient for
control unit and one display; multiple displays require addition­al power

Front panel Run/ Set toggle. In Set mode, Increment pushbut­ton is held until desired time is indicated on 2 digit display con­trol unit. Toggle in Run position enables normal operation.
Front panel display reads same as remote display. Two LED’s
indicate status

Display is mounted on 9.4”x7.1” metal plate which is attached to

13.5” x 9.5” red Plexiglas drilled with 4 countersunk holes for
mounting to exhibit surface. Weight 3 lbs.

1.5” high x 5.5” wide x 9.0” deep. Weight 3 lbs.

Power supply, 20 foot 4 conductor interconnect cable

RK-3 Rack Mount Kit; additional display units.

Rear Panel View of Control Unit

323 Andover Street Wilmington, MA, 01887
800-729-6873 / 978-657-3898 Fax: [phone]
www.museumtech.com / [e-mail]