Doug Fleenor Design DMXDECELERATOR User Manual

DOUG FLEENOR DESIGN, Inc.

Model DMX DECELERATOR

Operations Manual

Product description

The DMX DECELERATOR is a DMX512 isolator and re-timing device. It can receive
any signal within the DMX512 specification and it can accept some signals outside of
the specification. The DMX DECELERATOR produces a DMX output signal with
“relaxed” timing characteristics which are required by some DMX receiving devices.

Environmental

Operating temperature: 0-40º C
Operating humidity: 10-90% non-condensing
Indoor use only

Electrical ratings

Input: 100 - 240 VAC, 50 - 60Hz, 0.5A

Control cable

Standard 5 pin XLR cables should be used to connect DMX512 signals to the
connectors on the back panel of the DMX DECELERATOR. A male input is provided
and a female output is provided. The input is internally terminated.

Pins 4, and 5 of the 5 pin XLR connectors are not used by the DMX DECELERATOR.
They are not connected internally.

Setting the speed switch

The front panel speed switch is used to select the timing characteristics of the output
signal regardless of the characteristics of the incoming signal. The SLOW and FAST
settings have timing characteristics as shown below.

Switch setting Break time MAB time Inter-byte time Update rate

SLOW 284 µs 116 µs 52 µs 20 Hz

FAST 202 µs 36 µs 4 µs 40 Hz

Strand * 228 µs 33 µs 4 µs 31 Hz

* Strand timing is set using an internal jumper. See jumper settings below. Strand
timing adds an extra 7 millisecond mark-before-break idle time. This mode is only
needed when attempting to send DMX to an input on some Strand Ethernet nodes.

LED indicators

The LED indicators on the front of the DMX DECELERATOR have the following
functions:

LED label Function

SIGNAL On when DMX input is present. It is off when DMX is not present and

the HOLD LAST LOOK feature is disabled (default). It flashes when no
DMX is present and the HOLD LAST LOOK feature is active.

MIMIC Tracks the current level of dimmer 1 for troubleshooting purposes

PWR On when power is on

Jumper settings

Internal jumpers can be removed to change the behavior of the DMX DECELERATOR’s
output. To access the jumpers, remove the 4 screws which hold the front panel in
place. With the screws removed, the front panel can be removed and the top cover
panel can be slid out giving access to the jumpers on the circuit board. The jumpers
have functions as shown in the table below.

Jumper Installed function (default) Removed function

JP1 No output on loss of DMX input Hold last look on loss of DMX input

JP2 Disable driver on loss of DMX Leave driver enabled on loss of DMX

JP3 Use front panel switch for timing Set output for Strand timing

JP4 Unused Unused

JP5 Unused Unused

Warranty

Products manufactured by Doug Fleenor Design carry a five year parts and labor
warranty against manufacturing defects. It is the customer's responsibility to return the
product to Doug Fleenor Design (at the customer's expense) for service. Doug Fleenor
Design will repair the unit and return it to the customer (at Doug Fleenor Design's
expense). If a trip is necessary to the customer's site to solve a problem, the expenses
of the trip must be paid by the customer.

1. Note that this warranty is against Manufacturing Defects. It does not include damage
due to misuse or abuse. Most non-warranty repairs are made for a fixed $30.00 fee.