MegaTron
Controller
Supplemental
Manual
BACnet H22 / H26
Communications

BACnet Introduction

The MegaTron controller is capable of connecting to the WebAdvantage Server and most Building Management Systems. The WebAdvantage service requires a gateway to the internet with firewall and security rules in place. The Building Management System needs to be on the same subnet to properly receive traffic from the MegaTron. This may require some advanced routing of network traffic within the network wiring or programming of advanced switching equipment. The datatraffic for both is provided via the same Ethernet cable coming from the MegaTron.
The BACnet protocol allows interfacing with more customizable PC applications using HMI/SCADA and stand-alone HMI systems

BACnet Overview

BACnet is an American National Standard. The BACnet protocol allows the creation of an automation and controls system which may interoperate with other BACnet systems. In BACnet terms, interoperate means that two or more BACnet-speaking computer systems may share the same communications networks, and ask each other to perform various functions on a peer-to-peer basis.
BACnet’s flexibility has two important benefits: vendor-independence and forward-compatibility with future generations of systems. This is accomplished using an object-oriented approach for representing all information within each controller. Since BACnet is based on standards, it provides maximum benefits for both the vendor who designs BACnet systems, and the specifier or owner of those systems.

Protocal Implementation Conformance Summary (Annex-A)

Applications Software Version: JA.16.0 and higher
Firmware Revision: JA.16.0 and higher
BACnet Protocol Revision: 6
BACnet Standardized Device Profile (Annex L): BACnet Application Specific Controller (B-ASC)
BACnet Interoperability Building Blocks Supported (Annex K):

• DS-RP-B
• DM-DDB-B
• DM-DCC-B
• DM-RD-B

Standard Object Types Supported: See table 3-1 “Object/Property Support Matrix”.
Data Link Layer Options: BACnet IP, (Annex J)
Character Set Supported: ANSI X3.4

Connecting to BACnet enabled MegaTron

This guide is designed to help with connecting a BACnet enabled MegaTron to a local BMS.
Note: Screens may vary slightly between models.Step 1:
Press Setup/Run, CONFIGURE, NETWORK, SETTINGS.
(See figures 1, 2, 3 and 4. H26 dual cards add figure 3B. H26 only available for MegaTron MT.)
Step 2:
Press BAC. (See figure 4.) Note: If these options are not visible, the dual network card needs to be enabled. See enabling dual network card to continue setup.
Step 3:
Enter the DEVICE INSTANCE and PORT. Press Enter to accept on each. (See figure 6.)
Step 4:
Press RESET and then press Enter to accept. The communications card will reset after a short countdown. (See figures 7 and 8.)
Step 5:
After the communications card has been reset cycle power to the controller.

MegaTron XS Setup

The MegaTron XS will be a “device object” on the particular BACnet network. Each device object (your MegaTron XS) must have an object identifier that is unique network wide. The device object instance number is normally configured on site after the device is installed. The device object instance number range is between 0 and 4194303. Note that 4194303 is known as “unconfigured” and is not really a valid device instance number. All devices are required to respond with their own Device object instance number when 4194303 is requested.
To enter your device object identifier, go to the Configure menu in the MegaTron XS and select the Network settings. Then select BAC.

Object Definitions

Object / Property Support Matrix (Table 1-1)

Binary Input Object Instance Summary (Table 1-2)

Binary Value Object Instance Summary (Table 1-3)

Analog Input Object Instance Summary (Table 1-4)

Analog Value Object Instance Summary (Table 1-5)

Multi-State Value Object Instance Summary (Table 1-6)
Note #1  1=H-OFF 2=H-ON  3=OFF  4=ON

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Documents / Resources

Advantage Controls H22 MegaTron Controller [pdf] Instruction Manual H22, H26, H22 MegaTron Controller, H22, MegaTron Controller, Controller

References

• User Manual