Prosoft-technology 5201-DFNT-BACNET Bedienungsanleitung PDF herunterladen (Seite 31)

BACnet ♦ ProLinx Gateway BACnet Protocol Configuration

BACnet/IP Client Edition 2 Protocol Manual

ProSoft Technology, Inc. Page 31 of 52

November 24, 2010

Property

Code

Description Length Data Type

AI AO BI BO

46 Inactive Text Character String

O O

4 Active Text Character String

O O

15 Change of State Count Unsigned

O O

33 Elapsed Active Time Unsigned32

O O

6 Alarm Value Byte (Enumerated)

66 Minimum Off Time Unsigned32

67 Minimum On Time Unsigned32

40 Feedback Value Byte (Enumerated)

R=Read-only required by all devices.

W=Read/Write required by all devices.

O=Read-only and is optional for device.

If cell is blank, the property is not supported for the data type.

Please review the BACnet Protocol Specification for a complete discussion of

each of the property identification codes and for the definition of the enumerated

values. Care must be taken when designing the application to make sure

command message data does not overlap. Consult the server device

documentation to verify that the data type, point number, function and property

identification code are supported.

The Property ID column determines the Internal Address field. Use the previously

provided Property ID table to determine the data type used with the point.

Data Length Internal Address Offset

Bit Bit offset from start of database (packed data) (0 to 64000) - Each data point uses a single bit in

the database.

Byte Byte offset from start of database (0 to 7999) - Each data point uses a single byte in the database.

Unsigned (Byte offset)*2 from start of database (0 to 3999) - Each data point uses two bytes (one word

Unsigned32 (Byte offset)*4 from start of database (0 to 2999) - Each data point uses four bytes (two word

registers) in the database.

4-Bytes (Byte offset)*4 from start of database (0 to 2999) - Each data point uses four bytes (two word

registers) in the database.

4-Byte Real (Byte offset)*4 from start of database (0 to 2999) - Each data point uses four bytes (two word

registers) in the database.

Character String Byte offset from start of database (0 to 7999) - Each data point uses the number of bytes required

to store the character string. Care should be used with these property types to make sure the

database of one point does not overlap that of another.

NOTES

 The length of the Character String type is variable and may cause for a read operation to

overwrite other data if not enough space is allocated for each string.

 The binary input present value (property 85) returned from a read statement is placed at the bit

offset in the internal address.

 The bit offset in the internal database is used for the binary output read and write operations.

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