LYNX BACNET PROGRAMMABLE, VAV/UNITARY CONTROLLERS – PRODUCT DATA
EN0Z-0959GE51 R0615
8
1. Find an unused MAC address on the MS/TP network to
which the LYNX controller connects.
2. Locate the DIP switch bank on the LYNX for addressing.
This is labeled “MAC Address.”
3. With the LYNX Controller powered down, set the DIP
switches for the MAC Address you want. Add the value of
DIP switches set to ON to determine the MAC address.
See Table 3. For example, if only DIP switches 1, 3, 5,
and 7 are enabled, the MAC address would be 85 (1 + 4 +
16 + 64 = 85).
NOTE:
See Fig. 12 for DIP switch orientation and arrange-
ment.
Table 3. DIP switch values for MS/TP MAC address
DIP
7 6 5 4 3 2 1
VALUE
64 32 16 8 4 2 1
Setting the Device Instance Number
The Device Instance Number must be unique across the
entire BACnet system network because it is used to uniquely
identify the BACnet devices. It may be used to conveniently
identify the BACnet device from other devices during
installation. The LYNX controller’s Device Instance Number is
automatically set when it is added to a WEBStation-AX
project.
The Device Instance Number can be changed by the user,
which may be necessary when integrating with a third party or
when attempting to replace an existing controller and it is
desired to maintain the existing Device Instance Number.
To edit the Device Instance Number using WEBs AX:
1. Identify an unused Device Instance Number on the
BACnet Network, in the range of 0 - 4194302.
2. Open the LYNX BACnet Device Mgr View
a. Double click on the BACnet Network located in the
navigation tree.
b. Select the LYNX controller to be modified.
c. Click on the Edit button.
d. Enter an unused value in the Device ID field.
e. Select OK
3. Right click on the LYNX Controller and select “Actions >
Write Device Instance” to complete the update.
Termination Resistors
Matched terminating resistors are required at each end of a
segment bus wired across (+) and (-). Use matched precision
resistors rated ¼ W ±1% / 80…130
Ω
. Ideally, the value of the
terminating resistors should match the rated characteristic
impedance of the installed cable. E.g., if the installed MS/TP
cable has a listed characteristic impedance of 120
Ω
, install
120
Ω
matched precision resistors.
NOTE:
LYNX controllers do not provide network biasing.
Shield Terminating
Following proper MS/TP cabling shield grounding procedures
is important to minimize the risk of communication problems
and equipment damage caused by capacitive coupling.
Capacitive coupling is caused by placing MS/TP cabling close
to lines carrying higher voltage. The shield should be
grounded on only one end of the MS/TP segment (typically,
on the router end). Tie the shield through using the SHLD
(terminal 4) on the LYNX Controller.
Sylk™ Bus
Sylk is a two-wire, polarity-insensitive bus that provides both
18 Vdc power and communications between a Sylk-enabled
sensor and a Sylk-enabled controller. Using Sylk-enabled
sensors saves I/O on the controller and is faster and cheaper
to install since only two wires are needed and the bus is
polarity-insensitive. Sylk sensors are configured using the
latest release of the LYNX Tool for COACH
AX
.
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
9
9
9
ADD APPROPRIATE TERMINATION RESISTOR
BETWEEN BAC+ BAC- TERMINALS.
SHI
E
L
D
SHI
E
L
D
SHI
E
L
D
B
AC +
B
AC +
B
AC +
BA
C -
BA
C -
BA
C -
Fig. 11. Termination modules (BACnet MS/TP daisy chain
connections)
Wiring Details
Each controller is shipped with the digital outputs, which
switch the 24 Vac to the load (high side).
The three analog outputs (AO) are used to control modulating
heating, cooling and economizer equipment. Any AO may be
used as a digital output, as follows:
False (0%) produces 0 Vdc (0 mA)
True (100%) produces the max. 11 Vdc (22 mA)
The wiring connection terminals described in Table 4 are
shown in Fig. 12.
IMPORTANT
If the controller is not connected to a good earth
ground, the controller's internal transient protection
circuitry is compromised and the function of protecting
the controller from noise and power line spikes cannot
be fulfilled. This could result in a damaged circuit
board and require replacement of the controller. See
installation diagrams for specific wiring.
All controllers have terminal arrangements similar to the
example shown in Fig. 12 as described in Table 4.
