Doug Fleenor Design 125EE-WALL - Manual (Page 2)

Un-Terminated Indicator. The UT indicator is a troubleshooting and warning feature. Doug Fleenor Design
believes that a number of DMX512 signal failures are due to improper termination. The UT indicator can help
alert the user to potential problems before they ruin the show.
The UT indicator will illuminate when there is no load on the output data lines. The UT circuit is most accurate
when there is no signal applied (some digital signals can cause the UT indicator to dim or go out even when
there is no termination).
The UT indicator can also be fooled by certain DMX512 receiver circuits. Some DMX input circuits have pull
ups on the data lines which can prevent the UT circuit from detecting the load termination. If you believe the
line is properly terminated but the UT indicator remains on, try powering down or bypassing the receivers on
that line.
Fuses. The Fuses indicator should be illuminated whenever power is applied to the splitter. If any of the three
output fuses on an output should fail, the Fuses indicator will extinguish. It is normal for the Fuses indicator
to change intensity slightly with various digital signals and with changes in output loading.
Specifications:
Baud rate: 0 to 250 Kilobaud
Input circuit: EIA-485 receiver protected by two self resetting fuses
120 ohm input terminator protected by a self resetting fuse
Four transorb diodes: two on +Data, two on -Data
Input signal: 0.5 volts minimum, 12 volts maximum
Input can withstand up to 240 volts without damage, transients up to 5KV
Output circuit: "Slew rate limited" EIA-485 driver protected by two 1/10 amp fuses
One transorb diode on +Data, one on -Data, and one on the LED
(Slew rate limited outputs reduce the errors caused by unterminated lines)
Output signal: EIA-485 driver yields an approximate 3 volt signal into 120 Ohms
Outputs can withstand up to 12 volts without damage, transients up to 5KV
Outputs can withstand up to 240 volts with only a blown fuse(s)
Connectors: 3 conductor pluggable terminal blocks
Isolation: 2500 volt optical coupler, 5000 volt split bobbin transformer
Power input: 90 - 240 volts, 50/60 hertz, 0.1 amp (24 watts)
Color: Silver hammertone
Size & Weight: 10.5" deep, 2.0" high, 8.5" wide, 4.9 pounds
Doug Fleenor Design, Inc.
396 Corbett Canyon Road
Arroyo Grande, CA 93420
(805) 481-9599 voice and FAX
(888) 4-DMX512 toll free
web site: http://www.dfd.com