Notifier AM2020 Manual
Also see for AFP-200: Installation manualInstruction manualManual
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9Document 50182 Rev A2 10/28/96 P/N 50182:A2Appendix A: EIA-485 Shield TerminationsThe EIA-485 circuit must be wired using a twisted-shielded pair cable having a characteristic impedance of 120 ohms,+/- 20%. Do not run cable adjacent to; or in the same conduit as; 120-volt AC service, noisy electrical circuits that arepowering mechanical bells or horns, audio circuits above 25 V RMS, motor control circuits, or SCR power circuitsNote: All enclosures, including the FACP backbox, must be connected to earth ground! Never use the shield forgrounding purposes.Terminate the EIA-485 shields at both the Out and Return ends of the CCM-1 (or the DIA-1010 or DIA-2020 DisplayInterface Board if employing that option), at either the cabinet (when not in conduit) or at system common (when inconduit) as outlined below:When the EIA-485 shield is not in conduit: At each respective LCD-80TM enclosure (except the first on theloop), terminate the shield coming in from the previous LCD-80TM at the outside of the cabinet backbox (earthground). Let the outgoing (to next LCD-80TM) shield float (no connection). Shield termination between LCD-80TMs can only occur at the receiving end - the end connected to P1 Terminals 2 and 4. For the first LCD-80TMon the loop, let the shield coming in from the CCM-1 or DIA float.When the EIA-485 shield is in conduit: At each respective LCD-80TM enclosure (except the first on the loop),terminate the shield coming in from the previous LCD-80TM at system common. Let the shield going out to nextLCD-80TM shield float (no connection). Shield termination between LCD-80TMs can only occur at the receivingend - the end connected to LCD-80TM P1 Terminals 2 and 4. For the first LCD-80TM on the loop, let the shieldcoming in from the CCM-1 or DIA float.www.PDF-Zoo.com |
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