EAW D S A 2 5 0, D S A 2 3 0 1.5 Linking 2 ft / 0.6 m, Lift, 5 . 2 . 1 D E S C R I P T I O N

EIA-485

AUDIO A

AUDIO B

5 . 1 . 5 DAISY CHAINING COMPUTER AND AUDIO SIGNALS BET WEEN CLUSTERS

Any distance (within EIA-485 limitations) between clusters: 2-conductor shielded cable

Audio A, Audio B, and EIA-485

Connect in parallel to the incoming signal cables on one loudspeaker in the first cluster and connect to the same signal ports on one loudspeaker in the next cluster. Use the supplied 3-pin Phoenix Contact terminal plugs.

Recommended Conductor Gauge:

Figure 5.1.5 Linking > 2 ft / 0.6 m

24 AWG to 18 AWG / 0.2 mm to 1 mm

5 . 1 . 6 E I A - 4 8 5 T E R M I N AT E S W I T C H

EIA-485 TERMINATE SWITCH

	ON
EIA-
TERMIN485	OFF
A
TE	LIFT
AUDIO
GROUND
LIFT

Figure 5.1.6a EIA-485 Terminate Switch

EIA-485 termination has special requirements and limitations. See Appendix 8.3 for details.

Single Cluster:

Set the EIA-485 Terminate Switch on the loudspeaker (connected via the Phoenix connector) to “ON”.

Multiple Clusters:

Set the EIA-485 Terminate Switch to “ON” ONLY on the loudspeaker (connected via the Phoenix connector) at the end of the EIA-485 cable run furthest from the computer. Set all other Terminate Switches to “OFF”.

	DSA
	CLUSTERS
RS-232	TERMINATE
OR USB
TO EIA-485	SWITCH "OFF"
CONVERTER
PC	TERMINATE
	SWITCH "OFF"

TERMINATE

SWITCH "ON"

Figure 5.1.6b EIA-485 Network Diagram

CAUTION: Engaging the EIA-485 Terminate Switch on more than one loudspeaker on the EIA-485 cable run can cause intermittent or non-existent communications.

5 . 2 Co b r a N e t ™ N e t w o r k Co n n e c t i o n s

This section provides details about using the optional CobraNet™ technology for distribution of audio and computer control signals.

5 . 2 . 1 D E S C R I P T I O N

CobraNet™ is a combination software, hardware, and network protocol that replaces the audio and computer connections described in Section

5.1.Digitized audio and computer control is distributed by a CAT-5 (or better) cable to each loudspeaker. The network infrastructure must be designed using standard IEEE 802.3u 100BASE-T Fast Ethernet hardware. The network will not function properly using 10BASE-T technology.

5 . 2 . 2 C O B R A N E T ™ I S U S UA L LY D E S I R A B L E T O U S E W H E N :

·A star cable configuration is easier to implement for multiple loudspeakers

·A high degree of noise immunity is needed for the audio

·Future system expansion is likely

·Long cable runs that permit fiber optic cabling

·Other CobraNet™-capable products are used in the same installation

·The number of loudspeakers and clusters exceeds 32

·The audio source(s) have digital outputs

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