Johnson Controls Metasys N2 Manual Download

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Metasys Network Technical Manual 636

Network Communications Section

Technical Bulletin

Issue Date 1199

Code No. LIT-636018

www.johnsoncontrols.com

lntroduction

Page

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Application Details

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Theory of Operation

•

Components

•

Planning Considerations

*10

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Design Considerations

*11

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Maximizing Your System’s Efficiency

•

Specifications

*15

Installation Procedures

•

Preliminary Information

•

Sample Layouts

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Wiring--NCU/NEU to N2 Bus

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Wiring--ASCs to N2 Bus

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Installing the Repeater

*27

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Installing the Fiber Modems

•

Setting Terminations

•

Installing the Surge Protector

*36

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Setting the Channel Switch (NCM 101/102 Only)

*48

Commissioning Procedures

•

Overview

•

Checking N2 Bus Installation

•

Modifying N2 Bus Installation

N2 Communications Bus

*Indicates those sections where changes have occurred since the last printing.

Summary of Contents for Metasys N2

Page 1: ... s Efficiency 13 Specifications 15 Installation Procedures 17 Preliminary Information 17 Sample Layouts 18 Wiring NCU NEU to N2 Bus 24 Wiring ASCs to N2 Bus 27 Installing the Repeater 27 Installing the Fiber Modems 31 Setting Terminations 33 Installing the Surge Protector 36 Setting the Channel Switch NCM 101 102 Only 48 Commissioning Procedures 49 Overview 49 Checking N2 Bus Installation 49 Modif...

Page 2: ... Device 52 Checking the Number of Defined N2 Devices 52 Checking the Length of N2 Bus 53 Checking for T or Y Connections 53 Checking for a Ground Loop 53 Checking the Repeater 53 Checking the Surge Protector 53 Checking the Communication Terminal Board 54 Checking Communication Faults 55 Ordering Instructions 57 Johnson Controls Code Numbers 57 Vendor Code Numbers 57 Repair Parts 58 Indicates thos...

Page 3: ...RE XRL XRM and all Application Specific Controllers ASCs Figure 1 shows an example of several devices connected to the N2 Bus Note that the N2 Bus is wired in a daisy chained fashion in which multiple devices are connected in series The N2 Bus can use either solid or stranded wire It can also use optical fiber when special fiber modems are used Choices include 3 wire twisted cable two twisted pair...

Page 4: ...unications submodule slot The N2 Bus carries all communication between the NCM and the N2 devices The types of data that go across the bus include commands from the NCM to an N2 device data requests from the NCM to an N2 device responses from an N2 device to the NCM including identification changes of state advisories and requested data values complete databases for N2 devices time synchronization...

Page 5: ...with an offline device This type of poll occurs continually between the NCM and each offline N2 device that is defined in the NCM database An offline device is polled once after every complete scan of all online devices Once communication is established the NCM begins sending online polls to the device Online Poll a request from the NCM to the N2 device for any status changes The NCM polls devices...

Page 6: ...details refer to Guidelines for Efficient Operation Technical Bulletin LIT 636341 under the Appendix tab of this manual Figure 3 illustrates how a data request from an Operator Workstation OWS travels over the N1 Local Area Network LAN and the N2 Bus Figure 3 shows that the request is made at the OWS 1 The request is created at the OWS 2 The message is transmitted over the N1 LAN to the NCM that h...

Page 7: ...u at the OWS As mentioned before the NCM continually polls all N2 devices over the N2 Bus for changes in status When a change occurs the NCM will be sent that change when it polls the N2 device The NCM then formats a Change of State COS message and sends it over the N1 LAN to the OWS and other devices in the NCM s routing table for that particular COS message ...

Page 8: ... TBC801 also terminates the N1 LAN via two coax connectors It is shown in Figure 10 It allows an NCM to communicate with NEUs and ASCs The board is factory mounted and is located in the upper left corner of the 5 slot and 2 slot unit and on the left side of the 1 slot unit Every NCU and NEU contains a communication terminal board Repeater 4683 TTM 1 2 The N2 Bus repeater isolates and boosts the po...

Page 9: ...converter Each 2110 modem requires one 2121 Power Supply 9 Pin Connector Kit Male This kit is required to construct a 9 pin connector and hood for terminating the N2 Bus cable to the 9 pin female connector on the 2110 fiber modems The modems do not have a 3 point terminal block for the N2 as do other N2 devices The connector kit needs to use D style connectors solder style Cable The N2 Bus can use...

Page 10: ...mensions Device Dimensions N2 Bus Repeater 177 8 H x 109 2 W x 53 3 D mm 7 0 x 4 30 x 2 10 in BZ 1000 7 Enclosure 259 H x 249 W x 76 D mm 10 2 x 9 8 x 3 0 in AS ENC100 0 Enclosure 173 H x 185 W x 119 D mm 6 8 x 7 3 x 4 7 in 2110 Fiber Optic Modem 76 H x 44 5 W x 16 D mm 3 0 x 1 75 x 0 625 in 2121 Power Supply 38 H x 51 W mm 1 5 x 2 0 in The operating environment for the N2 Bus and its components m...

Page 11: ...ended N2 distances and excellent immunity to electrical noise lightning and various other building noises It may be buried underground between two buildings so that the N2 Bus can be extended in a campus type installation Table 2 summarizes the rules and maximums allowed for installing the N2 Bus You may wish to photocopy this table and keep it handy These statements are explained in following sec...

Page 12: ...NCM to an N2 device cannot go through more than two repeaters or two pairs of fiber modems i e cascaded repeaters modems This is because the repeater modem delays the N2 Bus signal between Sides A and B The N2 Bus can compensate for only two of these delays therefore up to two repeaters or two pairs of fiber modems can be cascaded in series These configurations are shown in Figures 12 13 and 14 No...

Page 13: ...ffic could slow down the system despite adequate memory Use generally accepted estimating practices then follow the guidelines below to maximize N2 operation Lab and Central Plant Controller LCP and DX9100 devices function differently than other Metasys controllers Therefore if you use these devices and have throughput problems follow the suggestions below to ensure that Metasys operates with maxi...

Page 14: ...NT Controller Version B02 or lower Variable Air Volume VAV Controller Version A02 or lower Refer to the following steps to determine the average rate at which messages are traveling over the N2 Bus 1 Using the N2 L2 S2 Statistics window track the number of polls commands and offline polls for a five minute period during peak usage To do this clear the statistics and reread them after the five minu...

Page 15: ...wisted pair telephone cable Two twisted pair cable with a shield All cables listed above can be solid or stranded Optical Fiber Physical Configuration Daisy chained Distance Between Devices Up to 1524 m 5000 ft Line Length Up to 4572 m 15 000 ft one repeater per 1524 m 5000 ft or 50 devices Standard Components N2 Bus Submodule NCM 101 102 only Communication Terminal Board Cable Optional Vendor Com...

Page 16: ...16 Network Communications N2 Communications Bus ...

Page 17: ...throughout a building Follow all National Electrical Code NEC and local code restrictions Do not exceed the device maximums given in this document Be careful when pulling N2 wire This is especially true if you are using 24 or 26 AWG wire which breaks easily when pulled Plenum grade wire is the best choice for pulling through tight areas Preliminary Information ...

Page 18: ...repeaters N2 layout with fiber modems N2 layout with branched fiber modems Figure 4 shows a network with two OWSs and two NCUs One separate N2 Bus segment is externally wired from each NCU Self Termination N2 Bus 5 slot NCU 1 slot NCU Operator Workstation 1 slot NEU N2 EOL Out ASC N2 EOL Out 2 slot NEU One N2 EOL In ILC Shown Operator Workstation N1 EOL In N1 EOL In NCM s N2 EOL In N1 EOL Out LAYO...

Page 19: ...s network continues to function logically as a single bus N2 Bus Operator Workstation 5 slot NCU N2 EOL Out Operator Workstation One N2 EOL In ASC ILC Shown 1 slot NEU N2 EOL Out Self Termination N2 Bus 5 slot NEU N1 EOL In N1 EOL In N1 and All N2 EOLs Out LAYOUT2 N1 LAN ASC UNT Shown Figure 5 N2 Bus Layout with NCU in the Middle ...

Page 20: ...ion has two segments N2 Bus Operator Workstation 5 slot NCU 1 slot NEU N2 EOL Out Operator Workstation Repeater Side A N2 EOL In Side B N2 EOL In 1 slot NEU EOL Out ASC ILC Shown EOL Out 2 slot NEU One EOL In N1 EOL In N1 EOL In N1 EOL Out NCM s N2 EOL In A B N1 LAN LAYOUT3 Figure 6 N2 Bus Layout with a Repeater ...

Page 21: ...OL Out Side B N2 EOL In A B Operator Workstation Repeater Side A N2 EOL In Side B N2 EOL Out 1 slot NEU N2 EOL Out ASC ILC Shown 1 slot NEU N2 EOL In N2 EOL Out A B B A ASC ILC Shown N2 EOL Out 2 slot NEU 2 slot NEU One N2 EOL In All N2 EOLs Out A B Repeater Side A N2 EOL In Side B N2 EOL In Repeater Side A N2 EOL Out Side B N2 EOL In N1 EOL In N1 EOL In N1 EOL Out NCM s N2 EOL In LAYOUT4 N1 LAN N...

Page 22: ...rd N2 signals to optics and the other to convert optics to the standard N2 signals TBC NCU N C M To Local N2 Devices To Local N2 Devices To Remote N2 Devices N2 Bus N2 Bus Fiber Cable EOL Out EOL In N2FIBER1 NCM s EOL In R S I Tech 2110 T Note For end of line termination rules see the Setting Terminations section of this document S I Tech 2110 R T Figure 8 N2 Bus Layout with Fiber Modems ...

Page 23: ...dle of Figure 9 TBC NCU N C M To Local N2 Devices To Remote N2 Devices N2 Bus N2 Bus EOL Out EOL In N2FIBER2 To Remote N2 Devices EOL Out EOL In NCM s EOL In N2 Bus EOL In EOL In N2 Bus EOL Out EOL In To Remote N2 Devices Notes Only two pairs of fiber modems can be cascaded For end of line terminations see the Setting Terminations section of this document To Local N2 Devices Fiber Cable Fiber Cabl...

Page 24: ...nsure a working N2 Bus the first time it is wired and make troubleshooting easier should a problem occur If the N2 wire has three conductors terminate the third wire and any spare conductors to REF not to SFT GRD Use the SFT GRD for a shield only Shielded cable is generally not required except in very high noise environments such as near gas ignition systems and radar or magnetic resonance imaging...

Page 25: ...o SFT GRD soft ground terminal To hard ground N2 Bus wire shield to HRD GRD hard ground N2 Bus should be hard grounded at only one location preferably at the NCU Wires that are labeled OUT and REF OUT are only used if the N2 Bus must continue to another device For two twisted pair cable terminate one pair to and Terminate the other pair by terminating one wire to REF and folding back and taping th...

Page 26: ... during installation If shielded wire is used wire shield to SFT GRD soft ground terminal for devices other than the NCM one location preferably at the NCU To hard ground N2 Bus wire shield to HRD GRD hard ground Wires that are labeled OUT and REF OUT are only used if the N2 Bus must continue to another device For two twisted pair cable terminate one pair to and Terminate the other pair by termina...

Page 27: ...e N2 Bus signal can travel Note however that the grand total of all N2 Bus segments can be much longer than 4572 m 15 000 ft For example in Figure 13 the grand total is 7315 m 24 000 ft however the longest single run is 4115 m 13 500 ft The station configuration shown in Figure 12 has repeaters wired in between the devices NEU ASC NCU N2 Bus ASC NEU NEU NEU NEU NEU Repeater 1524 m 5000 ft 50 Devic...

Page 28: ... Repeater Repeater Repeater NEU Repeater 1000 ft 1000 ft 500 ft 2500 ft 3000 ft 1000 ft 1000 ft 5000 ft 4000 ft 5000 ft NEU NEU REPEATC2 Note Branches can be at Side A or B EOL Out A EOL Out B EOL In A EOL Out B EOL In A EOL In B EOL In A EOL In B EOL In EOL Out EOL In EOL In EOL In EOL Out NCM s EOL In 305 m 305 m 762 m 914 m 305 m 305 m 1524 m 1219 m 152 m 1524 m Figure 13 Network Branch Configu...

Page 29: ...A EOL In NCM s EOL In B EOL In B EOL In EOL In A EOL Out A EOL Out A EOL Out Central Location 1 slot NEU Self Termination EOL In 1 slot NEU EOL In 1 slot NEU Self Termination A EOL In B EOL In B EOL Out 4997 ft 5000 ft B EOL In REPEATST 3 ft N2 Bus Maximum cable distance between two repeaters is 1524 m 5000 ft There is no rule for minimum distance between repeaters Note ASC UNT Shown ASC UNT Shown...

Page 30: ...2 N2 Bus Repeater Baud Rate Switches REPEATIN 3 2 1 3 2 1 Out In 120 VAC Note For two twisted pair cable terminate one pair to and and the other pair to REF EOL Jumpers Side B EOL Jumpers Side A Figure 15 Installing the Repeater 2 Mount the repeater in an enclosure such as the BZ 1000 7 Mount the enclosure in an appropriate location 3 Wire the repeater between two segments of the N2 Bus If you are...

Page 31: ...odem nearest to the NCM to the R Receive input of the modem near the N2 devices 3 Connect the fiber cable from the T Transmit output of the modem near the N2 devices to the R Receive input on the modem nearest to the NCM 4 Plug in the power supply for each modem CONNECT NCM Side N2 Devices Side Optical Fiber R T S I TECH MINI OPTICAL BIT DRIVER MODEL 2110 S I TECH MINI OPTICAL BIT DRIVER MODEL 211...

Page 32: ...7 and terminate the two pairs of N2 Bus cable at the end of the stub length To NCM To N2 Devices N2 Bus Fiber Cable STUBCONN To N2 Devices Use wire nuts to join N2 cable to stub length N2 N2 REF Maximum stub length is six inches S I Tech 2110 R T S I Tech 2110 R T S I Tech 2110 R T Figure 17 Connecting 2110 Modem in Between Two N2 Bus Segments Fiber Modem Between Two Segments ...

Page 33: ...g devices Includes AHU LCP UNT and VAV T End of line termination must be switched in EOLTERMS Figure 18 Setting EOL Terminations Follow these rules Set the EOL to In for any switch terminating device with one N2 cable connected since this is an end of line device For each N2 Bus segment at least one switch terminating device must have its EOL set to In This is typically the NCM or a repeater Howev...

Page 34: ...ers over Pins 1 and 2 EOL In Side B J3 and J4 If at end of line install both jumpers over Pins 1 and 2 EOL In If not at end of line install both jumpers over Pins 2 and 3 EOL Out If not at end of line and repeater is only switch terminating device on segment install both jumpers over Pins 1 and 2 EOL In The 2110 modem does not have an EOL jumper to set The EOL selection is instead accomplished by ...

Page 35: ... with the end of line selection set to Out wire the 9 pin connector using solder connections as in Figure 20 eol out N2 9 pin Connector REF Optional Shield Fold Back and Tape N2 Figure 20 Modem s Cable Connector EOL Set to Out Table 5 EOL Connections Summarized N2 Bus Signal For EOL Selection For Non EOL Selection N2 Terminal 7 Jumper 7 3 Terminal 3 N2 Terminal 8 Jumper 8 9 Terminal 9 REF Terminal...

Page 36: ...the N2 Bus near the N2 device Example applications are shown on Figures 21 and 22 Figure 22 shows extra protection with the installation of one suppressor near the first N2 device and another at the point where the N2 Bus enters the building N2 Bus Surge Protector N2 Bus A S C N C U N E U N E U A S C Surge Protector N2 Bus N2 Bus protect1 Figure 21 Surge Protector Installation on N2 Bus Installing...

Page 37: ...round repeatedly without damage to N2 Bus components CAUTION The device is capable of protecting the N2 Bus from indirect lightning strikes not direct lightning strikes A direct strike may cause actual damage to the bus cable or surrounding property An indirect lightning strike may cause induced voltage transients that could cause electronic malfunction without visible damage to equipment if the e...

Page 38: ...tor 1524 m 5000 ft standard N2 Bus specification Other Mechanical Features Encapsulated in Ceramgard for insulation and environmental protection Two part design for easy connection and replacement of protective device to base using edge connector Durable UL Recognized plastic enclosure material Dimensions H x W x D 63 5 x 50 8 x 25 4 mm 2 5 x 2 0 x 1 0 in One pair of surge protectors is required w...

Page 39: ...es Also follow these general steps 1 Mount the device per local codes and install in an enclosure if necessary as close as possible to the N2 device Any electrical box with a cover is acceptable Bond the enclosure to the N2 device by connecting the two with conduit that carries the N2 cable Note For extra protection you may as an option install a second protector at the point where the N2 Bus ente...

Page 40: ...le within 4 57 m 15 ft of the N2 device Your installation design will have to accommodate this requirement For NCUs NEUs you may use the hard ground termination on the Communications Terminal Board TBC as long as the ground wire is 4 57 m 15 ft or less to earth 5 For hard ground installation connect the shield to Pin 9 For soft ground installation connect the shield to Pin 7 For more details on in...

Page 41: ...tected 2 4 6 8 10 1 3 5 7 9 Surge Protector Protected Unprotected N2 Bus N2 N2 REF SFT GRD HRD GRD NCU HG Metal Enclosure HG HG NCU NEU Shielded N2 Bus HG At NCU wire shield to HRD GND connection For surge protector s hard ground use 12 AWG stranded wire 4 57 m 15 ft maximum length Make sure wires entering surge protector s enclosure are not close to wires leaving enclosure Notes For surge protect...

Page 42: ... enclosure Metal Enclosure SURGE2 Building One 2 4 6 8 10 1 3 5 7 9 Surge Protector Protected Unprotected ASC N2 N2 REF REF N2 N2 HRD GRD NCM HG ASC AHU LCP UNT VAV Unshielded N2 Bus HG Metal Enclosure ASC HG Building Two 2 4 6 8 10 1 3 5 7 9 Surge Protector REF N2 N2 Protected Unprotected HG Metal Enclosure HG N2 Bus R REF N2 N2 N2 Bus N2 Bus N2 Bus R R R HG Metal Enclosure HG Figure 25 Installin...

Page 43: ...enclosure are not close to wires leaving the enclosure SURGE3 AHU LCP UNT VAV Shielded N2 Bus Metal Enclosure Building One 2 4 6 8 10 1 3 5 7 9 Surge Protector Protected Unprotected ASC N2 N2 REF REF N2 N2 HRD GRD NCM HG ASC HG Metal Enclosure ASC HG Building Two 2 4 6 8 10 1 3 5 7 9 Surge Protector REF N2 N2 Protected Unprotected HG Metal Enclosure HG N2 Bus R REF N2 N2 N2 Bus N2 Bus N2 Bus R R R...

Page 44: ...ded N2 Bus The IAC IFC and ILC must each be on a separate N2 Bus Building One 2 4 6 8 10 1 3 5 7 9 Surge Protector Protected Unprotected N2 N2 REF REF N2 N2 HRD GRD NCM IAC IFC or ILC HG Metal Enclosure Building Two 2 4 6 8 10 1 3 5 7 9 Surge Protector Protected Unprotected HG HG HG N2 Bus R REF N2 N2 N2 Bus N2 Bus R R R HG Standard Fire or Security NCM IAC IFC or ILC Metal Enclosure HG N2 N2 REF ...

Page 45: ...es leaving the enclosure IAC IFC ILC Shielded N2 Bus The IAC IFC and ILC must each be on a separate N2 Bus SG S Building One 2 4 6 8 10 1 3 5 7 9 Surge Protector Protected Unprotected N2 N2 REF REF N2 N2 HRD GRD NCM IAC IFC or ILC HG Metal Enclosure Building Two 2 4 6 8 10 1 3 5 7 9 Surge Protector Protected Unprotected HG HG HG N2 Bus R REF N2 N2 N2 Bus N2 Bus R R R Standard Fire or Security NCM ...

Page 46: ...otected Unprotected Repeater REF N2 N2 HRD GRD NCM HG ASC Notes For surge protector s hard ground HG use 12 AWG stranded wire 4 57 m 15 ft maximum length Make sure wires entering surge protector s enclosure are not close to wires leaving the enclosure HG HG N2 Repeater Unshielded N2 Bus R HG COM R R R N2 Bus N2 Bus N2 Bus N2 Bus D D D D COM Side A Side B Side B REF N2 N2 Figure 29 Installing Surge...

Page 47: ... Repeater Shielded N2 Bus Notes For surge protector s hard ground HG use 12 AWG stranded wire 4 57 m 15 ft maximum length Soft ground SG the N2 Bus shield within one inch of entering the enclosure with a 560 1000 pF capacitor Make sure wires entering surge protector s enclosure are not close to wires leaving the enclosure R R R R REF N2 N2 SG S S S S N2 Bus N2 Bus N2 Bus N2 Bus SG Repeater COM D D...

Page 48: ... Channel Select End of Line Termination A Figure 31 Channel Select Switch on N2 Submodule Channel A is typically used for Metasys family N2 Bus devices Channel B is most often for wiring the L2 Bus devices such as the C210 and C260 application specific controllers to the Metasys Network This document discusses Channel A only For details on Channel B refer to the technical documents for the C210A a...

Page 49: ...can be detected with a Digital Voltmeter DVM Ordinarily this is the only equipment you ll need Modifying the N2 Bus includes adding deleting or relocating an N2 device These modifications can be performed while the bus is operating Note When you are modifying the N2 Bus remember to follow the N2 Bus rules as outlined in Table 2 An N2 device can be added between two other N2 devices or at the end o...

Page 50: ...ve the device from the slot If the EOL switch on this device was set to In set the EOL switch of the previous device to In To delete an ASC that is between two other N2 devices disconnect the In and Out sections of N2 wires at the ASC to be deleted Connect the two sections of the same color wire so as to follow proper polarity i e N2 IN to N2 OUT N2 IN to N2 OUT REF IN to REF OUT To delete an ASC ...

Page 51: ...or jumpers improper channel switch selection defective N2 device too many N2 devices defined N2 Bus is too long N2 Bus has T or Y connections installed ground loop present on N2 Bus defective repeater defective surge protector communication terminal board failure A few of these problems are detected with a Digital Voltmeter DVM and you can use an oscilloscope to pinpoint communication faults over ...

Page 52: ...ces per segment as end of line the N2 Bus may be loaded down reducing the total number of devices that can be connected Verify that the correct devices are set as end of line NCM101 102 only The channel switch on the N2 Bus Submodule must be placed in Position A the channel over which the N2 devices communicate The submodule is installed in one of the NCM submodule ports The N2 device if internall...

Page 53: ...Refer to the Installing the Repeater section in this document for details The device itself if defective can cause N2 communication problems For troubleshooting information refer to the manufacturer s literature The surge protector may cause N2 communication problems First make sure the surge protector is wired correctly especially the hard and soft grounds Refer to Figures 24 30 An easy way to te...

Page 54: ...ation Terminal Board Terminal Screw N2 Bus Wire Fuse 1 N2 F2 2 N2 F1 3 SFT GRD None 4 REF F3 5 SFT GRD None 6 HRD GRD None To check the TBC fuses remove the single screw that holds the board in place Pull the board out far enough to enable you to probe the non component side of the board Using an ohmmeter measure for continuity across each fuse by first placing one probe on the exposed portion of ...

Page 55: ...th B inverted function Follow these steps 1 Plug the scope into a grounded electrical outlet 2 Set both channels to 2 volts per division Both channels must have the same gain or volts per division setting 3 With no signal applied adjust each channel s vertical position at the same graticule on the screen i e center screen 4 Select the Channel A minus B function If your scope does not have this fun...

Page 56: ...tside this range indicates that the N2 Bus is not functioning properly Note At the dead time between messages you can measure the bias voltage In this figure it is 0 5 VDC Factors that can cause improper signal levels are N2 Bus wires are not polarized correctly i e wires are reversed N2 cable runs are too long 24 AWG wire has breaks in it An ASC has malfunctioned N2 Bus is improperly terminated e...

Page 57: ...Fiber Application Plug Amp Type No 747904 2 Cable Clamp Amp Type No 207467 1 Amp Corporation Interface Cable 9 to 25 pin AT Pigtail serial 2 feet DB9F DB25M CompuAdd 39661 CompuAdd Notes The 2110 modem comes standard with ST style connectors However SMA style connectors are available as options You will need to coordinate the fiber terminations with the type of connector ordered Check with the fib...

Page 58: ...nformation on returning defective material If the surge protector is defective contact the manufacturer for warranty and replacement details See Table 9 The following table contains the current Metasys order numbers Table 10 Metasys Order Numbers Component Order Number NCU Communication Terminal Board new model EN TBC821 0 NCU Communication Terminal Board old model EN TBC801 0 N2 Submodule NU N2B1...

Page 59: ...Network Communications N2 Communications Bus 59 Notes ...

Page 60: ...ork Communications N2 Communications Bus Notes www johnsoncontrols com Controls Group FAN 636 507 E Michigan Street Metasys Network Technical Manual P O Box 423 Release 10 0 Milwaukee WI 53201 Printed in U S A ...

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