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HVAC Drive H300 185
Issue Number: 3
10.5 Metesys N2 specification
All Metasys command messages consist of three main parts: beginning, middle, and end. These message segments are described in the following
sections.
Beginning
The beginning of each message (shown in bold) always contains the Start Of Message (SOM) character (>) followed by two characters representing
the address of the intended Metasys device (01-FF).
Example: >01120A0297® read binary input attribute 2
In the above example, > is the start of message character and 01 is the Metasys device address.
Middle
The middle of a Metasys message (shown in bold) contains one or more hex characters. The first hex character is the Command; the characters that
follow depend on the supplied command.
Example: >01120A0297® read binary input attribute 2
In the above example, "1" is the "Write Field" command. "2" is the "region" (binary input). "0A" is the Metasys object number (0A = 10 parameter
Pr 08.009) "02" is the attribute number (status).
End
The end of a Metasys message (shown in bold) always contains three characters: two characters representing the checksum followed by a carriage
return (0x0A). The "®" character is used in these examples to represent the carriage return.
Example: >01120A0297
® read binary input attribute 2
Compute the checksum by adding the hexadecimal values of all the ASCII characters in the message EXCLUDING the start of command character
(>). Use the last two least significant digits as the checksum.
Checksum Example
Example: >01120A0297® is a valid Metasys message that includes a checksum.
Where 01120A02 is the data used to calculate the checksum.
The start of message character is NOT part of the checksum calculation.
To produce the checksum add the decimal values of the ASCII characters that make up the command, convert the sum to Hex, and use the last two
digits as the checksum:
Converting the characters (01120A02) to their ASCII hexadecimal equivalents, we have:
0x30 + 0x31 + 0x31 + 0x32 + 0x30 + 0x41 + 0x30 + 0x32 = 0x197
Retaining the last two least significant digits of the sum, the checksum is 0x97
10.5.1 Region types
Metasys users will be able to configure any drive parameter and have "point access" to a subset of drive parameters. A "change of state" query will
return a status indication of those "points" that changed recently plus the new current value. Alarms and warnings are also supported. In general, any
Metasys commands that are identified to be "optional" are not supported by the H300 drive.
The sections below detail the Metasys N2 regions, points, commands, alarms and warnings supported by the H300 drive.
The Metasys protocol supports seven different kinds of "points"; these delineations are called regions. The supported region types are listed in the
table below.
Table 10-24 Region types
Metasys Point Types
Region Name Description
1 Analog Inputs Drive Numeric Parameters that are Read-only
2 Binary Inputs Drive Bit Parameters that are Read-only
3 Analog Outputs Drive Numeric Parameters that are Read-Write
4 Binary Outputs
Drive Bit Parameters that are Read-Write and
Read-only
5 Internal Float Values H300 private floating point parameters
6 Internal Integer Values Not used
7 Internal Byte Values Not used
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