MS/TP Field Device Attributes - Metasys - LIT-1201793 - Software Application - Site Management Portal - 12.0.50

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This object contains attributes common to many Metasys system objects. These common attributes are described in the Common Object Attributes section. This section includes attributes of the Focus/Configuration tab, the Diagnostics tab (if applicable), and any other tab specific only to this object. See the Object and Feature Tabs section for information on the attributes that appear on the other tabs of this object (for example, the Hardware and Options tab appear on point objects).

Note: In the notes column, attributes that are marked with a letter C are configurable, attributes marked with the letter W are writable, and attributes marked with the letter D indicates the default attribute for the display.
Table 1. MS/TP Field Device Object Attributes - Focus/Configuration Tab

Attribute Name


Initial Value


Alarm State


Indicates the current state of the object.

COV Min Send Time



Configures the object to send COV messages on a periodic basis instead of on every change of value that exceeds the COV Increment.




If True, allows communication between the Metasys system and the MS/TP controller.

End of Line



Indicates whether the device is at the end of the bus.

Fixed Boot Version

    Indicates the version of the Boot code in the field device. The Boot code is responsible for loading the Main code.



  Indicates the graphic associated with the object.

Graphic Alias



Indicates a portion of the graphic’s item reference, up to and including the name of the folder containing this object or the controller containing this point.

In Test


Displays True when a Control Sequence in the device is currently in a test mode. When True, the device is marked offline, although communication with the device is acceptable.

JCI System Status

    Reflects the current status of the system.


    Indicates the physical location of the device.

Manual Time Sync Type



Configures the type of BACnet Time Synchronization to send to a BACnet device.
  • UTC: UTC time synchronization message is sent.
  • Local: A local time synchronization message is sent.
  • None: No message is sent.
  • Auto: The mapper object's Protocol Services Supported attribute is used to determine which type of time sync is supported, and if:
    • utcTimeSynchronization is set, the code functions as if Time Sync Type is set to UTC.
    • utcTimeSynchronization is not set and timeSynchronization is set, local time is set.
    • neither utcTimeSynchronization nor timeSynchronization is set, an error is returned.

Model Name

    Indicates the product code for the device.


    Indicates whether the MS/TP controller is offline.


    Displays the device orderable product code.

Present Value



Indicates the current status of communication with the field device (Online, Offline, or Comm Disabled). A status of Comm Disabled indicates that the field device has been disabled. A status of Offline indicates that either communication problems exist, or the field device is currently in test mode.

Protocol Obj Supported


Indicates which standardized object types the device’s protocol implementation supports. Protocol Conformance Class reflects the minimum set of object types, but implementation often supports additional standard and non-standard object types with their own set of attributes. (The list of attributes supported for a particular object may be acquired by use of the ReadPropertyMultiple Web method with an attribute reference of All.)

Protocol Ser Supported


Indicates which standardized protocol services the device's protocol implementation supports. Protocol Conformance Class reflects the minimum set of services, but implementation often supports additional standardized services.

Startup Code Version


Specifies the version of the Startup code running in the controller. The Startup code is responsible for initial power up operations.

Vendor ID

    Identifies the unique manufacturer’s identifier, as defined by ASHRAE. For Johnson Controls, this value is 5.

Vendor Name

    Identifies the manufacturer of the device (should be Johnson Controls).
Table 2. MS/TP Field Device Object Attributes - Diagnostic Tab

Attribute Name


Initial Value


CPU Usage


Specifies a running average of CPU use. The value is updated every minute.

Flash Usage


Specifies the estimated percent of flash memory currently in use. The percentage is based on the portion of flash that is designated for use by the user’s database. A value greater than 100% can affect system reliability now or in future software releases. There are no restrictions in place to prohibit use of flash over 100%.

Has Unbound References


Indicates that a process cannot find an object either because the device on which the object is located is offline, the object has been deleted, or the object reference is incorrect.

Memory Usage

    Specifies the percent of field device RAM currently in use.

Object Count

    Indicates the number (count) of all of the object instances within the device. Objects of all types are included.

Object Memory Usage


Specifies the percent of the object database that is currently in use. Each object created consumes memory within the object database. This attribute can be used to help determine the device’s capacity for additional objects; however, other performance indicators should also be assessed.

Also, an attempt to create an object known to require X bytes of object database may fail even if more than X bytes are available in the object database. This is because the object database is composed of multiple blocks. A free space block of at least X contiguous bytes available for allocation may not exist, even if the total free space is more than X bytes.