| Вид документа | Технічний бюлетень |
|---|---|
| Виробник | JCI |
| Код документа | lonworks-n2e-bus-technical-bulletin |
| Група обладнання | N2 Bus |
| Сторінок | 33 |
| Мова документа | англійська |
| Розмір файлу | 0.5 МБ |
Текст документа
Technical Bulletin
Issue Date December 5, 2002
LONWORKS® N2E Bus
Introduction Page 3
Application Details 3
About LONWORKS Technology 4
Metasys Implementation 4
Theory of Operation 5
Components 6
Design Considerations 10
Upgrading Metasys N2 Bus to LONWORKS N2E Bus 13
Upgrading LONWORKS N2E Bus from TP78 to FTT10 13
Calculating Timing Between Peer-to-Peer Devices 14
Specifications 15
Installation Procedures 16
Preliminary Information 16
Acceptable Bus Layouts 17
Installing LONWORKS N2 Card into NCM350/361 18
Connecting Bus to NCM350/361 19
Connecting Bus to DX-912x Controllers 22
© 2002 Johnson Controls, Inc. 1
Code No. LIT-6364100 www.johnsoncontrols.com
Commissioning Procedures 24
Overview 24
Checking Bus Installation 24
Modifying Bus Installation 24
Troubleshooting Procedures Page 26
Overview 26
Checking for Good Wire Runs 27
Checking for Proper Termination 27
Checking End-of-Line Terminations 27
Checking DX-912x Controllers 27
Checking Number of Defined Controllers 27
Checking Bus Length 27
Checking for “T” or “Y” Connections 28
Checking for a Ground Loop 28
Improving System Performance 28
Ordering Instructions 29
Johnson Controls Code Numbers 29
Vendor Parts 30
Appendix A: LONWORKS N2E Bus Poll Estimation Worksheet 31
2 LONWORKS N2E Bus Technical Bulletin
Introduction
The LONWORKS® N2 Bus is a peer-to-peer network that allows DX-9120
Application or DX-9121 controllers (Version 3) to communicate with each other and
Details to send event-initiated data to the Network Control Module (NCM350 in
North America or NCM361 in Europe). The LONWORKS N2E Bus is
different and separate from the Metasys® N2 Bus.
There are also two types of N2E Bus: one has devices with the TP78
transceiver and the other has devices with the FTT10 transceiver. The
two types cannot be connected.
The following Metasys controllers can reside on the LONWORKS TP78
N2E Bus:
• DX-9120 controller that features a Neuron 3150 chip and a
TP78 transceiver
• NCM350/361 equipped with a LONWORKS interface card
(NU-NET201-0) and a TP78 transceiver
The following Metasys controllers can reside on the LONWORKS FTT10
N2E Bus:
• DX-9121 controller with a Neuron 3150 chip and an FTT10a
transceiver
• NCM350/361 equipped with a LONWORKS interface card.
(NU-NET202-0) with a FTT10a transceiver
Figure 1 shows an example of a network in which the NCM350/361 uses
the LONWORKS N2E Bus.
12345678 IN
OU RE
T LO
1 2 3 4 5 6 7 8 7 8 A
D
N1 LAN
EN
O CO DLIN
N NF OFE
IG
.
LONWORKS N2E Bus
B
PO a b
E FO PLE
RE
ASE
IN
DISCO
S
NNE
W TA DTBATT
L LI
E N
ERY
R G
M
EM
OR
Y
T
RE F
-
N2 N2
I
T
+
a
b
III
DI
S
P OW CO PO
NN SUW
SEE R E CT PER
PL
RV BE Y
IC F
IN OR
DX-9121 DX-9121 DX-9121
G E
T End-of-Line Terminator
NU-EOL201-0
D AN GER
N2EXAMPL
NCM300/311
Figure 1: Example of LONWORKS N2E Bus Layout
LONWORKS N2E Bus Technical Bulletin 3
As with the Metasys N2 Bus, devices over the LONWORKS N2E Bus are
wired in a daisy-chained fashion, with multiple devices connected in a
series. (However, you can use a short stub length to connect the
LONWORKS N2E card. Refer to Connecting Bus to NCM350/361 in this
document for details.) The LONWORKS N2E Bus uses solid or stranded
twisted pair wire. You cannot connect coaxial or fiber optic cables directly
to these devices.
The LONWORKS network is a local operating network that was developed
About by Echelon® Corporation. The network is built around the Neuron chip, a
LONWORKS microprocessor that combines three Central Processing Units (CPUs) into
Technology one chip. The Neuron chip is an integral component of the DX-9120 and
DX-9121 controller.
Various physical layout media options are available. The LONWORKS N2E
Bus uses twisted pair cable and either the TP78 transceiver or the FTT10
transceiver. The DX-9120 controller has a TP78 transceiver, and the
DX-9121 uses an FTT10 transceiver.
The LONWORKS network uses the LonTalk™ protocol, a software
language for field device communication. This protocol uses the Open
Systems Interconnect (OSI) reference model and features all seven
communication layers for interoperability among control devices. For
more information on LONWORKS technology, contact the Echelon
Corporation.
The LONWORKS N2E Bus, NU-NET201-0 and NU-NET202-0
LONWORKS N2E card, and DX-9121 and DX-9120 controller have
LONMARK® interoperability certification.
Metasys system implementation of LONWORKS network is:
Metasys
Implementation • peer-to-peer communication, which enables control intelligence to
reside at the controller level
• high speed network (78 K baud)
• DX-9120-8454 or DX-9121-8454 controller (Version 3), which
contains the Neuron chip
• twisted pair cable as the only media choice (two wire, shielded or
unshielded)
• support of a LONWORKS Industry Standard Architecture (ISA) card
(NU-NET201-0 or NU-NET202-0) installed into the NCM350/361.
(The NCM101/102/401 or NCM200 cannot use this component.)
4 LONWORKS N2E Bus Technical Bulletin
• support of multiple DX-9120 or DX-9121 controllers per
NCM350/361 (See DX-9100 Extended Digital Controller Technical
Bulletin [LIT-6364020] for details.)
• support of two end-of-line terminators (NU-EOL201-0 or
NU-EOL202-0)
The LONWORKS N2E Bus requires Metasys Release 7.01 or later.
DX-9120 and DX-9121 devices are defined as N2E Bus devices through
Metasys Person-Machine Interface (PMI) or Data Definition Language
(DDL). The device type that identifies the DX-9120 and DX-9121 is
called “DX91ECH.” The LONWORKS N2E is identified by the system as
N2E (N2 Echelon LONWORKS).
The Metasys software does not distinguish between the DX-9120 (TP78)
and DX-9121 (FTT10) devices, and both are configured in the same way.
DX-9120 and DX-9121 controllers cannot reside on the same N2E Bus.
The LONWORKS N2E Bus is wired to the N2 Bus terminal block of each
DX-9120 or DX-9121 controller. If you want supervisory communication
for downloads, monitoring, and event reporting at the
Metasys Operator Workstation (OWS), the NCM350/361 is a required
component. Port 2 on the NCM350/361 is defined as N2E, and a
LONWORKS ISA card is installed into ISA Slot 2 of the NCM350/361. In
this arrangement, the NCM350/361 is a supervisory controller but does
not take part in the exchange of data between the controllers or
communicate on a peer-to-peer basis.
The LONWORKS N2E Bus is a peer-to-peer network operating at 78 K bits
Theory of per second (78,000 baud).The network enables DX-912x controllers to
Operation send and receive data among themselves without a supervisory system.
This communication is made possible by the controller’s Neuron network
processor, which communicates with the other Neuron network
processors. Both analog and digital data may be transmitted from
one controller to another, and any one piece of data--one analog value or
block of 16 digital values--may be sent from one controller to up to
16 other controllers.
LONWORKS N2E Bus Technical Bulletin 5
Communication The LONWORKS N2E Bus carries all communication between the
Types NCM350/361 and the DX-912x controllers and among the controllers
themselves. The types of data that go across the bus include:
• commands from the NCM350/361 to the DX-912x
• automatic reporting of alarms and changes-of-logic states from the
DX-912x to the NCM350/361
• responses from the DX-912x to the NCM350/361, including
identification and requested data values
• complete databases for the DX-912x controllers
• time synchronization message from the NCM350/361
• analog and binary point data shared among DX-912x controllers
Poll Priorities Poll priority levels establish how often the NCM350/361 polls a DX-912x
controller to determine whether the device is online or offline. The
LONWORKS N2E has four priority levels: 0, 1, 2, and 3, where 0 is the
highest. For example, a Priority 2 device is polled more often than a
Priority 3 device.
You set the priority level when defining the DX-912x. We recommend
that you keep the priority levels for all DX-912x controllers at 3, the
system default. You may, however, assign higher priorities to a limited
number of DX-912xs if your application requires faster online/offline
notification for those DX-912x controllers. Realize that the poll priority
has a reverse effect on response times. In other words, as you assign more
devices to Priority 0, bus traffic increases and Change-of-State (COS)
reporting performance decreases.
The components of the LONWORKS N2E Bus are the NCM350/361,
Components LONWORKS N2E card for NCM350/361, DX-912x controllers, end-of-line
terminators, ferrite clamp kit, and twisted pair wire.
Note: The LONWORKS N2E Bus does not support the use of repeaters,
surge protectors, or fiber optic modems.
NCM350/361 The NCM350/361 (NU-NCM350/361-8) is an optional component but
required if you need to download, monitor, or report COSs to a
supervisory system. Each NCM350/361 can support one
LONWORKS N2E Bus.
6 LONWORKS N2E Bus Technical Bulletin
1 2 3 4 5 6 7 8 IN D
OA
OU
T
REL
1 2 3 4 5 6 7 8 7 8
. OF
ON ON
FIG EN
D
E
C LI N - A T TE N T I O N -
AM
W ER a b D-R
PO
F E R
2 N 2 N I
-
+
II
a A
TT
E R
Y
B
ISAOTS
SL
b
III
D I S C O NN E C T
P O W E R B E F OR E
O W L ER
Y
P PP
S E RV IC IN G
U
S
I
IV
II
MM-
CO ORTS
P
I II
IV
D A N G E R
L IN E V O L TA G E
IN S ID E
NCM350/361 N2-NCM
Figure 2: NCM350/361
LONWORKS If you use the NCM350/361 on the bus, a LONWORKS ISA card
N2 Card (NU-NET201-0 or NU-NET202-0) is required. Install this card into Slot 2
(right-hand slot) of the NCM350/361. You may notice a colored button on
the top of the card. If you press this service button, the Neuron chip sends
out a message over the network with its unique ID code. This has no use
with a Metasys system. If you press the button, it does not affect the
network or any Metasys component.
LONWORKS N2E Bus Technical Bulletin 7
Echelon LONWORKS
Echelon LONWORKS Chip
Firmware Chip
GND VDC
Service Button and
Light-Emitting Diode
LON - V1.0 (LED)
Neuron
3150 Chip
Screw Plug
Terminal
(For N2E Bus
Connection)
9-pin D-type
Connector (Not Used)
OFF OFF OFF OFF
Input/Output (I/O) Address Switches N2LONBRD
Figure 3: LONWORKS N2E Card
8 LONWORKS N2E Bus Technical Bulletin
End-of-Line You must install End-of-Line (EOL) terminators (NU-EOL201-0 or
Terminator NU-EOL202-0) at each end of the bus to balance the
LONWORKS communications signal. You must attach a small length of
2-wire cable to each terminator for connection to a controller. The unit has
screw terminals. The top terminal set is used; the other set is not. You can
mount the terminator on DIN rails or next to the controller with
double-sided tape or Velcro fasteners.
Wire Terminal
Block
60 mm
(2.4 in.)
60 mm
(2.6 in.)
12.5 mm
(0.5 in.)
termin
Figure 4: End-of-Line Terminator
Ferrite Clamp Kit A ferrite clamp kit is included with the LONWORKS N2E card. This kit
contains components that you need to install on the LONWORKS N2E Bus
wires that connect to the NU-NET201-0 and NU-NET202-0 card. The kit
contains two large clamps, two small beads, and two tie wraps. You need
to install the kit to meet United States Federal Communications
Commission (FCC) and European CE Mark emission requirements.
LONWORKS N2E Bus Technical Bulletin 9
Ferrite Beads (2) Ferrite Clamps (2) Tie Wraps (2)
kit
Figure 5: Ferrite Clamp Kit
Cable A balanced 120 ohm twisted pair cable is required. Use 22 AWG solid or
stranded wire. As an option, you can use shielded cable. Refer to Table 4
for a list of recommended wire.
CABLE
Figure 6: Cable
The LONWORKS N2E Bus provides exceptional performance over an
Design equivalent N2 Bus configuration for alarm reporting and intercontroller
Considerations communication if you take full advantage of the peer-to-peer
communication capability of the DX-912x. However, if the bus is heavily
polled by a Network Control Module (NCM), the bus can become
overloaded, resulting in decreased bus performance. You may notice this
performance problem when displaying system summaries and graphics.
The LONWORKS Bus is ideal for many devices where a COS is rarely
reported. The LONWORKS Bus can become a bottleneck if COSs are sent
at a rate of more than one per second for an extended time. Use the
Appendix A: LONWORKS N2E Bus Poll Estimation Worksheet in this
document to help you configure N2E Bus installations. The worksheet
allows you to calculate the message rate generated by a particular NCM
configuration.
The N2E Bus must be engineered differently from the N2 Bus in order to
match the performance of an N2 Bus. Follow these guidelines to ensure
adequate response time.
10 LONWORKS N2E Bus Technical Bulletin
• Avoid using Binary Data (BD) and Analog Data (AD) objects mapped
to Control System (CS) Object attributes. Instead, map critical points
to Logic Result Status (LRS) or unused Analog Outputs (AOs), which
can be direct mapped to Binary Input (BI) and Analog Output Setpoint
(AOS) objects.
• Map all XT/XTM expansion points to Metasys objects directly.
• Avoid using Metasys Trend and Point History features.
• Do not put alarm warnings on Analog Input (AI) objects.
• Split systems so there are only 15 to 20 analog values in each.
• Use DX program module capabilities rather than Graphic
Programming Language (GPL) for analog calculations or data sharing.
• Avoid polling (see the LONWORKS N2E Bus Poll Estimation Worksheet
in this document).
• Use peer-to-peer network variables to move data from one DX to
another.
• Map only binary items that do not contain bits with rapid COS. Avoid
this situation by either:
- transferring a slow DI1 to an LRS logic variable in the
Programmable Logic Controller (PLC) module and then mapping
the LRS to a BI object in the NCM
- or
- moving rapid COS type bits (a pulse counter input, for example)
to an XT/XP module
Note: The additional cost of an XP module or extra
configuration may well reduce overall costs by improving
system performance.
For a complete listing of item groups, see the DX-9100
Configuration Guide (LIT-6364030), XTM905 Extension
Module, XPx-xxx Expansion Modules Technical Bulletin
(LIT-6364210), and XT-9100 Configuration Guide
(LIT-6364050).
Cable Type The LONWORKS N2E Bus requires a balanced 120 ohm twisted pair cable
with two wires. You can also use shielded cable.
LONWORKS N2E Bus Technical Bulletin 11
Number of The address range of DX-912x controllers is 1 to 255, and up to
Devices 30 DX-912xs can be physically connected to one NCM over the
LONWORKS N2E Bus. For acceptable performance on installations with
high communication traffic, the number of controllers is normally fewer
than 10 per N2E Bus. You can connect multiple NCMs through the
N1 LAN (Local Area Network) with each NCM having its own
LONWORKS N2E Bus, which means that a system can have several
LONWORKS N2E Buses.
For additional details, refer to DX-9100 Extended Digital Controller
Technical Bulletin (LIT-6364020).
Bus Length A maximum of 1200 meters (4000 feet) of daisy-chained cable is allowed
from the NCM350/361 to the farthest DX controller, including any stub
lengths. We do not support repeaters to extend the distance of the bus
length.
Metasys N2 Bus The NCM350/361 supports one Metasys N2 Bus in addition to the
Support LONWORKS N2E Bus (Figure 1). The Metasys N2 Bus supports all
existing Metasys Application Specific Controllers and System 91
controllers except the LONWORKS DX-9120 and DX-9121.
When defining the NCM in the Global file in DDL, configure the
LONWORKS N2E Bus as Port 2 (physically Port 6 of the NCM350/361)
and the Metasys N2 Bus as Port 1. When defining DCDR devices in the
NCM File in DDL, the Metasys N2 Bus is Trunk 1 and the
LONWORKS N2E Bus is Trunk 2.
We do not recommend use of the N2 Bus and the N2E Bus on one NCM
except for very small installations where performance is not critical or the
communication load is light (for example, small extensions to existing
installations that provide acceptable performance). If in doubt, install
separate NCMs for N2 Bus and N2E Bus devices.
For any communication required between a device on a Metasys N2 Bus
and a device on a LONWORKS Bus, use the standard peer communication
provide by the N1 LAN and the NCMs.
IMPORTANT: The Design Considerations section of the Dual N2 Bus
Application Note (LIT-6363145) is not applicable to the Metasys N2 Bus of an
NCM that also has a LONWORKS N2E Bus.
12 LONWORKS N2E Bus Technical Bulletin
If you want to use peer-to-peer communication for an existing network,
Upgrading the LONWORKS N2E Bus can replace a single Metasys N2 Bus
Metasys installation. However, these rules must be applied:
N2 Bus to
LONWORKS N2E • If the cable of an existing Metasys N2 Bus is the correct type, you can
Bus reconfigure the N2 Bus as a LONWORKS N2E Bus. However, only the
NCM350/361 and DX-9120 or DX-9121controllers can reside on the
LONWORKS N2E. Any Metasys controllers other than DX-912xs that
currently reside on the bus, such as the DX-9100 and Variable Air
Volume (VAV) controllers, must be removed. Also, because the
LONWORKS N2E does not use the REF wire, tape back the REF wire
at each device that is being replaced with a DX-912x.
• The LONWORKS N2E Bus is designed to take advantage of the
peer-to-peer communication capabilities of the DX-9120 or DX-9121.
Make sure that communication with the NCM and Operator
Workstation is provided only for monitoring and internetwork
functions and does not involve continuous data transfer between
controllers and the NCM.
• To reduce communication between DX-912x controllers and the
NCM, use the Metasys AI and BI object mapping capabilities of the
DX-912x, and avoid the use of BD and AD objects for alarm
monitoring via CS objects.
In summary, an N2 Bus configuration with complete dependence on the
master-subordinate communication between the NCM and the DX-9100
controllers does not provide equal performance when transferred directly
to the LONWORKS N2E Bus with the DX-912x. However, a LONWORKS
N2E Bus, when correctly configured, provides superior performance over
an equivalent N2 Bus configuration for alarm reporting and intercontroller
communications.
When extending a small installation of DX-9120 controllers, you may
Upgrading want to replace the DX-9120 controllers with DX-9121 controllers. The
LONWORKS N2E FTT10 transceiver used in the DX-9121 is now preferred within the
Bus from TP78 building controls industry for the LONWORKS field bus. The DX-9120 was
to FTT10 discontinued except as a repair part in March 2001.
The overall performance of the DX controller on the N2E Bus is the same
with TP78 or FTT10 transceivers. (FTT10 transceivers offer the advantage
of a free topology network structure and a line power option in
non-proprietary, open LONWORKS networks.)
LONWORKS N2E Bus Technical Bulletin 13
To upgrade an N2E Bus from TP78 to FTT10, change the following
components:
• DX controllers
• mounting bases
• LONWORKS N2E card in the NCM 350/361
• end-of-line terminators
Refer to the Ordering Instructions section of this document for the
component ordering codes. When upgrading, you do not have to change
the following:
• field wiring, sensors and actuators
• Metasys software and database configuration
• DX controller configuration in the GX Software Configuration Tool
It is possible to calculate how long it takes for a network point on the
Calculating DX-912x to broadcast a change in state or value to all other DX-912xs.
Timing Doing so helps you determine how many points to share across
Between controllers. To make this calculation, use the following equation:
Peer-to-Peer
Devices (Number of Peer-to-Peer Modules * 0.5 sec) +
(Number of Destination Connections of the Changed
Module * 0.1 sec) + 0.4 sec
Example One Network Analog Output (NAO) point shared with five DX-912xs
Number of Peer-to-Peer Modules = 1 (NAO)
Number of Destination Connections = 5 (DX-912xs)
Transmit time for one network point change to be broadcast to all
controllers:
(1 module * 0.5 sec) + (5 connections * 0.1 sec) +
0.4 sec = 1.4 seconds
Note: This calculation assumes that all nodes are online and
communicating. If one or more nodes are offline, the transmission time
required is greater.
14 LONWORKS N2E Bus Technical Bulletin
Table 1: Specification
Specifications Category Specification
Product Name LONWORKS N2E Communications Bus
Network Bus Polarity Polarity insensitive
Supply Voltage 5 VDC ±10%
Typical Supply Current 10 mA
Bus Wiring UL Level 4, 22 AWG (0.65 mm) twisted pair (solid or
stranded)
Address Range of 1 to 255
Devices
Nodes per Bus 30 per NCM350/361
Transmission Speed 78,000 bits per second (78 K baud)
Termination Method Terminators at both ends
Physical Configuration Daisy-chained (maximum stub length 3m [10 feet])
Total Line Length Up to 4,000 feet (1200 meters)
Standard Components NCM350/361
LONWORKS N2E card
DX-912x Controllers
End-of-Line Terminators
60 x 12.5 x 60 mm (2.4 H x 0.5 W x 2.4 D in.)
Cable
The performance specifications are nominal and conform to acceptable industry
standards. For application at conditions beyond these specifications, consult the local
Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting
from misapplication or misuse of its products.
LONWORKS N2E Bus Technical Bulletin 15
Installation Procedures
When installing LONWORKS N2E Bus wiring throughout a building, be
Preliminary aware of the following:
Information
• Follow all National Electrical Code (NEC) and local code restrictions.
• Do not exceed the device maximums given in this document.
• Do not run bus cables close to transformers or high frequency
generating equipment.
• Run low voltage bus cables separately from line voltage and power
cables.
• Do not connect any bus wire to the COM terminal on the
DX-9100-8990/6/7 or DX-9121-8996/7 terminal board. The
LONWORKS N2E Bus does not use these terminals.
• If shielded cable is used, ground the shield at one location only
(normally at the NCM350/361).
• Use solid or stranded 22 AWG (0.65 mm) diameter cable. Do not use
thinner gauge wire (24 AWG or greater), because it can break easily
and limits the total bus length to less than the specified maximum
length.
16 LONWORKS N2E Bus Technical Bulletin
The following are examples of acceptable layouts for the
Acceptable Bus LONWORKS N2E Bus. The NCM can be at either end of the bus or in the
Layouts middle with controllers on both ends. As shown, an end-of-line terminator
is required at the end of each bus segment.
N1 LAN
I
II
II I
IV
NCM350/361
T DX-912x DX-912x DX-912x
T
LONWORKS N2E Bus
NCM350/361 NCM350/361
N1 LAN
I
II II
N1 LAN
II I II I
IV IV
T
DX-912x DX-912x DX-912x DX-912x DX-912x
LONWORKS N2E Bus T LONWORKS N2E Bus T
T
DX-912x DX-912x DX-912x DX-912x
T End-of-Line Terminator
T
LAYOUT
T LONW ORKS
N2E Bus
Figure 7: Acceptable Bus Layouts (Note: All controllers on one N2E Bus must be the
same model [DX-9120 or DX-9121].)
LONWORKS N2E Bus Technical Bulletin 17
In order for the NCM350/361 to be connected to and communicate over
Installing the LONWORKS N2E Bus, a LONWORKS ISA card is required. As part of
LONWORKS installation, the card’s I/O address factory setting is verified and the card
N2 Card into installed into the second ISA slot (right-hand slot) of the NCM350/361.
NCM350/361
1. Turn power off at the NCM350/361.
2. Verify that the I/O Address on the card is set to the factory default of
0340h (Figure 8). The address is set with Switches S1, S2, and S3.
I/O Address (hex): 3 4 0
Switch Set to: 1 1 0 1 0 0 0 0
Hex Value of Bit: 2 1 8 4 2 1 8 4
ON DIP
1 2 3 4 5 6 7 8
Note: The position of each of the eight slide switches is shown by
the white area. A switch is set to 1 when it is pushed towards
the ON side as indicated on the switch assembly.
switch
Figure 8: LONWORKS ISA Card I/O Address Switch Settings
3. Install the card into Slot 2 of the NCM350/361 (right-hand slot),
referring to Figure 9. In order to insert the card, you must temporarily
remove the colored screw plug terminal.
18 LONWORKS N2E Bus Technical Bulletin
12 34 56 78
-ATTENTION -
D
-R
PLEASE DISCO NNEDT BATTERY
O R
U E A
T LO M
1 2 3 4 5 6 7 8 7 8 A
D
CO EN
ON NF D
OLF
IG IN
E
.
PO
W
ER
a b
REF
LONWORKS
-
+ N2 N2
N2E Bus
Slot 1 Slot 2
NEXT SERVICE DATE: B
AT
T E
RY
Metasys N2 Bus
Terminal
DISCONNECT P
O
S W
P E
U R
SERVICING P
LY
DANGER
LINE VOLTAGE
INSIDE
R
Reserved for ARCNET card. Install LONWORKS card here.
STRIP
Figure 9: LONWORKS Card Installs into Slot 2 of NCM350/361
4. Return power to the NCM350/361.
The LONWORKS N2E Bus is connected to the NCM350/361 at its
Connecting LONWORKS N2E card. A ferrite clamp kit is provided with the card. This
Bus to kit contains two clamps, two beads, and two tie wraps that must be
NCM350/361 properly installed onto the N2 Bus wire to meet FCC and CE Mark
emission requirements. Refer to Figure 10 and Figure 11.
1. Cut a small piece of N2 Bus wire about 15 cm (6 inches). Use this
wire as a stub length.
Note: If a longer stub length is required, up to 3 meters
(10 feet) is allowed. Also, if the NCM350/361 you are
connecting is at the end-of-line, a stub length is not needed.
See Figure 11.
2. Remove the N2E Bus screw plug terminal from the LONWORKS N2E
card. It is labeled on the card as ST1.
LONWORKS N2E Bus Technical Bulletin 19
3. Referring to Figure 10, install the ferrite clamps, beads, and tie wraps
to the stub length. Note that each wire is looped once around the small
beads before it is connected to the screw plug terminal. The tie wraps
keep the two large ferrite clamps from slipping off the wire. Cut off
the excess length of tie wrap.
Screw
Plug
Terminal
Ferrite
Beads
Tie Wrap
Ferrite
Clamps
Tie Wrap
INSTLKIT
Figure 10: Ferrite Clamp Installation
4. Connect the stub length to the screw plug terminal, stripping back
enough wire to make the connection. There are no + or - terminals
because this network is not polarity sensitive.
5. Using standard wire screws or nuts, connect the free end of the stub
length to the N2E Bus wires that lead to the other controllers
(Figure 11).
Note: If the NCM is at the end of the bus segment, install an end-of-line
terminator to the screw plug terminal. (You need to install a small section
of N2E Bus wire to the terminator in order to connect it to the screw plug.)
You need a terminator only if the NCM is at the end of the bus.
6. Reconnect the ST1 screw plug terminal to the card.
20 LONWORKS N2E Bus Technical Bulletin
To Next Controller
LONWORKS N2E Bus
If End-of-Line Terminator is Needed:
Wire Screws/Nuts
Stub Length Note: No stub length
15 cm (6 in) required.
Note: RT+ and RT- wires from DX-912x
Ferrite Clamp Kit
can be connected to either terminal. Terminator
(See previous figure.) Correct polarity need not be
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