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Bacharach HGM300 Installation Manual

Bacharach hgm300 to johnson metasys n2 communications adapter electrically isolated n2 port version
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Download this manual See also: Operation & Installation Manual
3015-4570
Revision 1.1
8/6/03

Installation Guide

Bacharach HGM300 to Johnson Metasys N2
Communications Adapter
Electrically Isolated N2 Port Version
Introduction
The Bacharach HGM300 to Johnson Metasys N2 Communcations Adapter enables an
HGM300 Refrigerant Monitor to communicate with a Metasys building management
system. Zone PPM readings, flow status, refrigerant selections, and HGM internal health
may be viewed on Metasys operator stations. In addition, each HGM zone supports three
levels of alarming (Leak, Spill, Evacuate) through Metasys and each alarm threshold can
be set through Metasys.
The N2 Communications Adapter can be used in conjunction with the RDM800 remote
display if desired. Wiring details and operation limitations when using the RDM800 will
be discussed below.
Caution
The adapter is powered from the 120V Auxiliary Power connection on the HGM main
board. When the HGM is powered up, 120V is present on the lower left corner of the
adapter within the area shown on the board silkscreen. Keep fingers away from this area
when HGM is powered!!
Adapter Installation Inside HGM300
The communications adapter board will normally be installed in the HGM300 at the
factory. It can, however, be field installed by following the instructions below.
The following installation materials are needed for field installation of the adapter:
(5) 6-32 x ¼" screws (standard finish)
(5) 6-32 x ½" threaded standoffs
(5) 6-32 x ¼" decorative black anodized screws (standard finish OK, black looks nicer)
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Summary of Contents for Bacharach HGM300

  • Page 1: Installation Guide

    HGM is powered!! Adapter Installation Inside HGM300 The communications adapter board will normally be installed in the HGM300 at the factory. It can, however, be field installed by following the instructions below. The following installation materials are needed for field installation of the adapter: (5) 6-32 x ¼”...
  • Page 2 The adapter board mounts on the rear of the HGM300 door. Position the adapter board so as not to interfere with the HGM internal components when the door is shut. Mark (Figure 1) and drill the board’s four corner holes and center hole in the door. Install the five standoffs on the rear side of the door using the five black decorative screws on the front side of the door.
  • Page 3 If an RDM800 remote display is NOT used with the adapter, refer to Figure 2 for wiring details. In this case, all wiring between the HGM300 main board and adapter is contained within the HGM300 and the only external cable is the N2 communications cable.
  • Page 4 Note that when the RDM800 is used, TWO RS-485 cables must be run between the HGM300 and RDM800, so plan accordingly. In either case, be sure to set the HGM300’s internal “Terminator” slide switch next to the RS-485 terminal block to the “In” position.
  • Page 5 Field Hookup of N2 Communications The “BAS BUS” (N2) RS-485 communications port on the adapter is electrically isolated from the HGM300 and from earth ground. This prevents problems with potential differences in “ground” between physically separate locations. Connect the N2 ‘+’ wire to the BAS BUS N+ terminal block screw. Connect the N2 ‘-‘...
  • Page 6 6 of 10...
  • Page 7 Setting Metasys N2 Address On Communication Adapter Switches 1-8 on the adapter’s ‘B’ dipswitch are used to set the Metasys N2 node address. Possible addresses are 1-255. Use the following technique to set switches B1-B8: Divide the desired N2 address by 16. Take the integer part of the result (0-15) and use the following table to set switches B1-B4: N2 address upper half (N2 address lower half)
  • Page 8 If configuring the HGM with an RDM800, the communications adapter’s presence will not affect the standard configuration procedure. If configuring with a laptop PC, temporarily disconnect the HGM300’s RS-485 cable from the adapter until configuration is complete and the laptop is disconnected.
  • Page 9 When an RDM800 remote display is used, the N2 network will have access to the HGM300 as long as the RDM800 is in either the SYSTEM or ZONE VIEW screen. If the RDM800 is set to display any other screen, it will respond to polls from the N2 adapter with an HGM BUSY exception code.
  • Page 10 Communications LED Indicators See Figure 4 for the locations of the communications LED indicators. The communications adapter board has four LED communications status indicators numbered 1-4. The meanings of these indicators are as follows: LED 1 ON: Adapter is transmitting a poll/command to the HGM LED 2 ON: Adapter is receiving a response from the HGM LED 3 ON: Adapter is transmitting a response to Metasys N2 (because poll/command was directed to this slave)