Network Connection - JBL Intellivox-DC115 Installation Manual

NETWORK CONNECTION

The RS-485 network connection should be permanently
wired in any of the following situations:
• The Intellivox is to be constantly monitored in operation.
• The physical location of the Intellivox makes access to
the network connector problematical.
• It is not practical (e.g. on a large scale installation) to
configure each device locally.
The RS-485 interface permits multiple Intellivox units to be
"daisy-chained" in parallel, so that they are controlled by
the same PC. In such a system, each Intellivox must have its
own unique network address; this is determined via
WinControl for each individual loudspeaker.
unit 3 unit 2
A
B
Y
Z
DGND DGND
to other devices
fig.9.1 - Multiple units "daisy chained" in parallel
The network connection should be wired as shown in the
table and diagram below:
or
1 2 3 4 5
fig.9.2 - Network connections
WAGO PIN NO. XLR5 PIN NO.
1 5
2 4
3 3
4 2
5 1
Note that the table above contains information with respect
to 5-pin XLR wiring. A 5-pin XLR connector is commonly used
to connect the network to the USB to RS-485 converter.
Note that 2-pair, individually-screened cable should be used for
RS-485 connection. The transmit (Tx) and receive (Rx) balanced
data lines must be wired via their own twisted pairs.
12
unit 1
A A
B B
Y Y
Z Z
DGND
host
Y
Z
A
B
DGND
5 4 3 2 1
LABELLED FUNCTION
A Data Rx +
B Data Rx -
Z Data Tx -
Y Data Tx +
DGND
CAT-5 type UTP or FTP cable is NOT suitable. Please refer to the
Appendix section of this manual for cable specifications.
A +
B -
Y +
Z -
DGND
RS-485 port
fig.9.3 - Twisted pairs
The maximum cable length over which the network
connection will operate reliably depends on the cable type
and the baud rate used. With good quality cable, a safe
maximum figure (at 19.2 kbaud) is 2000 m. If the distance
is significantly longer than this, a network repeater will be
required.
Before connecting multiple devices to the same
network subnet, ensure that their network
addresses do not overlap. Each device should be set to a
unique network address (determined via WinControl).
In some installations, it is normal practice to
disconnect the RS-485 network from the USB to
RS-485 converter at the host (computer) during normal
operation. This removes the possibility of extraneous data
being inadvertently transmitted over the network. In such a
situation, the converter is only reconnected when system
maintenance or checks are required. Disconnecting from the
converter in this way leaves the Rx lines of the devices
unterminated. In most situations this does not present any
problems, but with a large network in a hostile EMC
environment, it is recommended that the host Y and Z lines
(host Tx/device Rx) are terminated in a 100 ohm resistor for
normal operation. This can be easily achieved by plugging
the XLR5 female connector into a spare male connector with
the resistor on the appropriate pins. This termination can then
be removed and the converter reconnected when necessary.
(If there is any doubt about which pins should be terminated,
shorting all five pins will generally be equally effective.)
Further information on the RS-485 network can be found in
the RS-485 converter manual and in the WinControl Help files.
JBL Intellivox Installation Manual
network cable
twin twisted
individually
shielded
201401/IvxIM_v2.2