Automated Logic DIAG485 Owner's manual

Automated Logic Corporation •1150 Roberts Blvd. •Kennesaw, GA 30144 • 770/429-3000 •770/429-3001 Fax •
www.automatedlogic.com • Copyright 2003 Automated Logic Corporation. All rights reserved. Automated Logic, the
Automated Logic logo, SuperVision, Eikon, and Alert are registered trademarks of Automated Logic Corporation.
InterOp is a trademark of Automated Logic Corporation. BACnet®is a registered trademark of ASHRAE. All other brand
and product names are trademarked by their respective companies.
Technical Instructions
DIAG485
Using the DIAG485 2
Specifications 2
Mounting 2
Power Wiring 2
Communications Wiring 2
Diagnosing Network Problems 3
Protection 3

Revised 7/24/03 • DIAG485 2 © 2003 Automated Logic Corporation
Using the DIAG485
The DIAG485 (see Figure 1) is a diagnostic
board that shows the communication signal
levels on the network segment. The DIAG485
can also reduce the effects of noise on the
CMnet by adding bias.
Figure 1. DIAG485
21/2"
6.4 cm
Bias
Jumper
Off On
Power
Connection
CMnet
Connection
4"
10.2 cm
Power Jumper
+
-
Shield
24VAC
Gnd
Specifications
Power 24VAC, 0.3A, 50-60Hz, 7.2VA
(Single Class 2 Source Only, 100VA or
less).
Temperature Range 0 to 130 °F (-17.8 to
54.4 °C).
Operating Humidity Range 10-90%
relative humidity, non-condensing.
Mounting
WARNING If equipment is used in a manner
not specified by the manufacturer, the
protection provided by the equipment may be
impaired.
Provide at least 1.5 inches (3.8 cm) of
clearance from each edge of the DIAG485 for
wiring.
1. Remove DIAG485 from the snap-track.
2. Mount the snap-track using self-drilling
screws. Drill directly into the plastic near
the edges of the snap-track so that the
screws will be visible when the DIAG485
is installed. This prevents loose screws
from shorting out the back of the board.
3. Mount the DIAG485 on the snap-track by
pushing it firmly into the grooves.
Power Wiring
CAUTION The DIAG485 is a Class 2 device
(less than 30VAC, 100VA). Take appropriate
isolation measures when mounting it in a
control panel where non-Class 2 devices
(120VAC or greater) are present.
1. Make sure that the power source is off.
2. Connect the two power wires to the
connector labelled 24VAC on the
DIAG485.
3. Turn the power source on.
4. The LED labelled POWER should light
when the ON/OFF jumper is set to ON.
Communications Wiring
Two 120 Ohm terminators are included with
each DIAG485. These terminators should be
placed at each end of the segment to prevent
signal distortions (see Figure 2 on page 3).
1. Remove the DIAG485’s power jumper or
place it in the off position.
2. Check the communication wiring for
shorts and grounds.
3. Connect the communication wires to the
CMnet port on the DIAG485. Be sure to
follow the same polarity as used
throughout the rest of the CMnet.
4. Replace the DIAG485’s power jumper or
place it in the on position.
5. Verify communication with the network
by viewing module status reports on a
SuperVision workstation.

Figure 2. Sample CMnet Configuration
Se g m e n t
MMMMMMMM
MM MMMMMMMM
D
R
TT
P
Se g m e n t
Segment
TT
T
T
MMMMM M M MM
P
P
P
PP
R
D
D
M
=Module
=REP485
= 120 Ohm
terminators
=DIAG485
=PROT485
=EarthGround
R
T
D
P
M
Revised 7/24/03 • DIAG485 3 © 2003 Automated Logic Corporation
Diagnosing Network
Problems
Figure 3 explains the meaning of some of the
signals you may see on the DIAG485. The
length of the network segment affects these
displays; on a lengthy segment, fewer LEDs in
each column may be illuminated. Likewise,
on a short segment, more LEDs may be
illuminated.
Figure 3. Reading DIAG485 LED Signals
Net - Net +
Good communications
One terminator missing
Both terminators missing
No terminator, no bias
Off
On
Properly
terminated, no bias
Too many terminators,
or excessive cable length
Adding Bias
The Bias jumper on the DIAG485 board (see
Figure 1) determines whether network bias is
added. Only one DIAG485 per network
segment can have the Bias jumper in place.
The DIAG485 with the Bias jumper should be
placed in the middle of the segment.
Additional DIAG485s with the Bias jumper
removed may be used on a segment for
monitoring the network communications.
Protection
The DIAG485 is protected by an internal solid
state Polyswitch on the CMnet. This
Polyswitch is not replaceable and will reset
itself if the condition that caused the fault
returns to normal.