Alfa Network N2 Specifications

Metasys Network Technical Manual 636Network Communications SectionTechnical BulletinIssue Date 1199© 1999 Johnson Controls, Inc.1Code No. LIT-636018 w

10 Network Communications—N2 Communications BusThis section describes briefly what you need to know when planning toinstall the N2 Bus.The N2 Bus r

Network Communications—N2 Communications Bus 11This section describes briefly what you need to know when designing anN2 Bus installation. A properl

12 Network Communications—N2 Communications BusGeneral• Each NCM can support one or two N2 Bus. The devices that you placeon the N2 Bus must be dai

Network Communications—N2 Communications Bus 13• The maximum distance between two fiber modems is 2012 m(6600 ft). If your application requires len

14 Network Communications—N2 Communications Bus• Move the LCPs and DX9100s to a separate N2 Bus, as described in theDual N2 Bus Application Note (L

Network Communications—N2 Communications Bus 15Table 3: SpecificationsCategory SpecificationProduct NameN2 Communications BusError CheckingModule 2

16 Network Communications—N2 Communications Bus

Network Communications—N2 Communications Bus 17Installation ProceduresThere are a few considerations that you should be aware of when installingN2

18 Network Communications—N2 Communications BusSix sample layouts of the N2 Bus are shown in Figures 4 through 9. Alsoshown are the proper End-of-L

Network Communications—N2 Communications Bus 19Figure 5 shows an NCU in the middle of the single N2 Bus segment. TheN2 Bus in this network continue

2 Network Communications—N2 Communications BusTroubleshooting Procedures Page *51• Overview *51• Checking for Good Wire Runs 51• Checking for Prope

20 Network Communications—N2 Communications BusFigure 6 shows a repeater lengthening the N2 Bus. The configuration hastwo segments.N2 BusOperator W

Network Communications—N2 Communications Bus 21Figure 7 shows the N2 Bus branching from multiple repeaters. The branchcan be at either Side A or B.

22 Network Communications—N2 Communications BusFigure 8 shows the standard N2 Fiber layout. Notice two S.I. Tech 2110modems are needed for each con

Network Communications—N2 Communications Bus 23Figure 9 shows a branched N2 Fiber layout. Any path from the NCM to anN2 device cannot go through mo

24 Network Communications—N2 Communications BusThe N2 Bus is wired to the communication terminal board of the NCU orNEU using the terminal block la

Network Communications—N2 Communications Bus 25653214TwistedTwisted653214TwistedTwistedOUT (+)REF-INOUT (-)REF-OUTHRDGNDSFTGNDSFTGNDSFTGNDHRDGNDSFT

26 Network Communications—N2 Communications BusTwistedTwo Twisted Pair Telephone Cable3-wire Twisted CableTBCWIRE23 62 51 4HRDGNDSFT

Network Communications—N2 Communications Bus 27The N2 Bus is wired to the dedicated terminal block on each ASC. Fordetails, refer to the technical

28 Network Communications—N2 Communications BusFigure 13 shows the branch configuration, with multiple repeaters wiredtogether and a separate branc

Network Communications—N2 Communications Bus 29Figure 14 shows the star configuration, in which the first three repeatersare installed in a central

Network Communications—N2 Communications Bus 3IntroductionThe N2 Communications Bus is a local network that links controllers andpoint interfaces t

30 Network Communications—N2 Communications BusThe instructions for installing the repeater include setting the baud rate,wiring the N2 Bus, and wi

Network Communications—N2 Communications Bus 31The 2110 fiber modems can be installed in any location on the N2 Bus.Just as only two repeaters can

32 Network Communications—N2 Communications BusIf you need to place the 2110 modem between two segments of N2 Bus,wire a stub length of six inches

Network Communications—N2 Communications Bus 33In order to properly terminate the N2 Bus, you need to know the two typesof terminating devices. The

34 Network Communications—N2 Communications Bus• To set the EOL jumpers on the repeater, refer to Table 4 and Figure 15.Remove the cover of the rep

Network Communications—N2 Communications Bus 359-pin Connectoreol-inOptionalShieldFold backand tape.Solder jumper wires between Pins 3-7 and Pins 8

36 Network Communications—N2 Communications BusSurge protection is strongly recommended if the N2 Bus is wired betweenbuildings. The protection is

Network Communications—N2 Communications Bus 37N2 BusSurgeProtectorN2 BusNCUNEUNEUASCASCSurgeProtectorN2 BusN2 BusSurgeProtectorprotect2Figure 22:

38 Network Communications—N2 Communications BusTable 6 lists the specifications of the surge protector.Table 6: Surge Protector SpecificationsCateg

Network Communications—N2 Communications Bus 39The surge protector consists of two sections: the terminal block and themain assembly. These section

4 Network Communications—N2 Communications BusThe N2 is based on Opto-22 Optomux protocol, which was designedfor industrial applications, and is

40 Network Communications—N2 Communications Bus4. Connect the protector to earth ground with 12 AWG stranded greenwire as shown in Figures 24 throu

Network Communications—N2 Communications Bus 41SURGE1Metal EnclosureNEUHGBuilding TwoBuilding One24681013579SurgeProtectorN2+N2-N2 REFSFT GRDHRD GR

42 Network Communications—N2 Communications BusNotes: For the surge protector's hard ground (HG), use 12 AWG stranded wire, 4.57 m (15 ft) max

Network Communications—N2 Communications Bus 43Notes: For surge protector's hard ground (HG), use 12 AWG stranded wire, 4.57 m (15 ft) maximum

44 Network Communications—N2 Communications BusNotes: For the surge protector's hard ground (HG), use 12 AWG stranded wire, 4.57 m (15 ft) max

Network Communications—N2 Communications Bus 45SURGE5Notes: For the surge protector's hard ground (HG), use 12 AWG stranded wire, 4.57 m (15

46 Network Communications—N2 Communications BusMetal EnclosureSURGE6Metal EnclosureASCHGBuilding TwoBuilding One24681013579SurgeProtectorN2+N2-REFP

Network Communications—N2 Communications Bus 47Metal EnclosureSURGE7Metal EnclosureASCHGBuilding TwoBuilding One24681013579SurgeProtectorN2+N2-REFP

48 Network Communications—N2 Communications BusThe Channel Select switch is located on the front of the N2 Submodule(Figure 31). It configures the

Network Communications—N2 Communications Bus 49Commissioning ProceduresCommissioning the N2 Bus includes checking and modifying the wiringbetween a

Network Communications—N2 Communications Bus 5INOUTCONTBCTBCTBC2-slot NEU5-slot NCU 1-slot NEU ASC(ILC Shown)DCM XM NCM XM DCM DCM XMDCM

50 Network Communications—N2 Communications BusTo add a DCM or XM to a new NEU, connect the N2 Bus to the newNEU via the respective communication t

Network Communications—N2 Communications Bus 51Troubleshooting ProceduresThe N2 Bus is a reliable communications bus. However, there aresituations

52 Network Communications—N2 Communications BusTo verify proper cable termination, examine all N2 Bus wiring. Theremust not be any breaks in the th

Network Communications—N2 Communications Bus 53The N2 Bus may not communicate because the length of the bus is toolong. The recommendation is 1524

54 Network Communications—N2 Communications BusCommunication may fail if one or more of the fuses on the communicationterminal board blows. The TBC

Network Communications—N2 Communications Bus 55Base FrameTBC801tbcfuseLeads from Continuity Tester or OhmmeterFigure 32: Checking Fuses on theCommu

56 Network Communications—N2 Communications Bus0 V -Ch 1 = 2 V/div.T/div 0.5 mS3 to 10 V pp(including +0.5 VDC Bias)scopesgFigure 33: N2Bus Signal

Network Communications—N2 Communications Bus 57Ordering InstructionsTable 8: Johnson Controls Code NumbersDescription Product Code NumberN2 Submodu

58 Network Communications—N2 Communications BusIf the communication terminal board or N2 Submodule is defective,replace it. Refer to the Warranty s

Network Communications—N2 Communications Bus 59Notes

6 Network Communications—N2 Communications BusThere are four priority levels assigned to N2 devices: 0, 1, 2, and 3, where0 is the highest. The pri

60 Network Communications—N2 Communications BusNoteswww.johnsoncontrols.comControls Group FAN 636507 E. Michigan Street Metasys Network Technical M

Network Communications—N2 Communications Bus 7To take this example one step further, suppose a point object at an N2device changes state and needs

8 Network Communications—N2 Communications BusThe components of the N2 Bus are the N2 Bus Submodule (NCM101/102only), communication terminal board,

Network Communications—N2 Communications Bus 9Fiber Optic Modems (S.I. Tech 2110)--These are communicationdevices that provide conversion between s