Distech ECYPSE - Page 167

ECLYPSE User Guide 167
Symptom
Possible Cause
Solution
Cut or broken wire.
Isolate the location of the break and pull a new
cable.
The BACnet data bus has
one or more devices with
the same MAC Address.
See Adopting a Numbering System for MAC
Addresses, Device Instance Numbers, and
Network Numbers on page 127.
The baud rate for all
devices are set to AUTO
At least one device must be set to a baud rate,
usually the data bus master. See Baud Rate on
page 113.
The device is set to a
MAC Address in the
range of 128 to 255.
See if the STATUS LED on the device is showing a
fault condition. See Table 16-2 for a list of fault
codes.
This range is for slave devices that cannot initiate
communication. All Distech Controls’ devices are
master devices and must their MAC Address set
accordingly. See Device Addressing on page 125.
The maximum number of
devices on a data bus
segment has been
exceeded.
Use a repeater to extend the BACnet data bus.
See Maximum Number of BACnet MS/TP Devices
on a Data Bus Segment and Baud Rate on page
112.
The STATUS
LED is blinking
The device has auto-
diagnosed a fault
condition
See Table 16-2 for a list of fault codes.
Controller
communicates
well over a short
network BACnet
MS/TP network,
but does not
communicate on
large network
Network length
Check that the total wire length does not exceed
the specifications of the Network Guide: Data Bus
Physical Specifications and Cable Requirements
on page 115.
Wire type
Check that the wire type agrees with the
specification of the Network Guide: Data Bus
Physical Specifications and Cable Requirements
on page 115.
Network wiring problem
Double check that the wire connections are correct.
Absent or incorrect
network termination
Check the network termination(s). Incorrect or
broken termination(s) will make the communication
integrity dependent upon a controller’s position on
the network.
Number of controllers on
network segment
exceeded
The number of controllers on a channel should
never exceed 50. Use a router or a repeater: See
Data Bus Segment MAC Address Range for
BACnet MS/TP Devices on page 112.
Max Master parameter
Configure the maximum number of master device
on the MS/TP network in all devices to the
controller’s highest MAC address used on the
MS/TP trunk. See BACnet MS/TP Data Bus Token-
Passing Overview on page 126.
Hardware input is
not reading the
correct value
Input wiring problem
Check that the wiring is correct according to the
module’s hardware installation manual and
according to the peripheral device’s manufacturer
recommendations.