High End Systems Roadster Orbital Head System - Manual (Page 23)

CHAPTER 2
Setup and Configuration
Roadster Orbital Head System User Manual 13
Test each cable with a voltage/ohm meter (VOM) to verify correct polarity and to make sure
that the negative and positive pins are not grounded or shorted to the shield or to each other.
Constructing a Terminator
Install a 120 ohm, 1/4 watt (minimum) terminator in the fixture’s Data Out (female) cable
connector in the last fixture on each DMX link. A terminator on the last fixture of the link
prevents data reflection, which can corrupt the data communication on the link.
Purchase a terminator from a High End Systems dealer/distributor (see Accessories on page
2), or follow the instructions below to construct a terminator.
To construct a terminator:
1. Disassemble a male 5-pin XLR connector.
2. Solder a 120 ohm resistor, minimum of 1/4
watt, between pins two and three (see 3.).
3. Reassemble the XLR connector
Setting Up a DMX Link
Each fixture on a DMX link has a data in and a data out (through) connection. The Roadster
Orbital Head functions as a fixture on the link using 12 channels to control mirror movement
and projector lens functions. The controller sends commands through the Power Hub to
control mirror movement and position an image from the projector. The Roadster Orbital Head
can be daisy-chained to other automated lighting fixtures on the link.
Caution: Do not connect anything to the ground lug on the XLR
connectors. Do not connect or allow contact between the
common (cable shield) and the fixture’s chassis ground.
Grounding the common could cause a ground loop and/or
erratic behavior.
XLR 5-pin connector cable
Grounding lug (inside XLR shell)
Positive
(data true)
Common
(cable shield)
Common
(cable shield)
Positive
(data true)
Negative
(data complement)
Negative
(data complement) Negative
(data complement)
Negative
(data complement)
Positive
(data true)
Positive
(data true)
Male XLR Connector Female XLR Connector
Data cable terminator
2
3
1
4
5
12
0Ω