Daylight Saving Time (Time Zone Settings) - Honeywell VISTA Series User Manual

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Table 2 Definition of Fields
Field
EP
FC(bit2­bit 9)
CC (bit10­bit 25)
OP
Pyramid Wiegand format
Several alternatives exist for customers who require more codes. The first is to switch to Keri's standard 39 bit
Pyramid format. This 39 bit Wiegand format contains 17 bits for the facility code field and 20 bits for the ID
number field. Mathematically these 17 facility code bits allow for a total of 131,072 (0 to 131,071) facility codes,
while the 20 ID number bits allow for a total of 1,048,576 (0 to 1,048,575) individual ID's within each facility
code. Since there are so many facility codes in the Pyramid format, a new facility code may be selected for
each project. Additionally the large number of ID's per facility code makes the Pyramid format ideal for very
large projects. For added security, Keri Systems tracks credential coding to ensure that no duplication occurs.
Table 3 provides a summary of the Pyramid Wiegand format.
Table 3 Pyramid Wiegand Format
Custom Wiegand Formats
The second alternative is to create a custom Wiegand format. Typically, up to 64 bits are available for creating
a custom Wiegand format. With certain limitations, formats with greater than 64 bits may be created. If a
customer currently has a custom Wiegand format from Wiegand or from other proximity manufacturers, Keri
can normally match that format. Although the customer is primarily responsible for custom format card coding,
as an added benefit Keri Systems tracks card coding for additional security. Table 4 provides an example of
one possible custom Wiegand format.
Table 4 Example of a Custom Wiegand Format
10.6 Daylight Saving Time (Time Zone Settings)
The Daylight Saving Time (DLST) is a widely used system of adjusting the official local time forward to save
energy. The uniform time adopted during the implementation of this system is known as the DLST. Typically
clocks are adjusted forward one hour in the summer to make people early to bed and early to rise so as to
make full use of illumination resources and save electricity. Clocks are adjusted backward in autumn. The
specific DLST regulations vary with countries. At present, the DLST system is adopted every year by about
110 countries in the world.
Honeywell VISTA Series Products User Manual
EP FC
Even Parity bit (EP) is judged based on field 1 to 13 bit. EP is 1 if the
number of "1" is even; otherwise, EP is 0.
Facility Code (0­255)
Bit 2 is the Most Significant Bit (MSB).
Card Code (0­65 535). Bit10 is the MSB.
The value of Odd Parity bit is determined by 14–26 bit. OP is 1 if the number
of "1" is even; otherwise, OP is 0.
Bit Number
Bit 1 Even parity over bits 2 to 9
Bits 2 to 18 Facility code (0 to 131,071); Bit 2 is MSB
Bits 19 to 38 ID Number (0 to 1,048,575); Bit 19 is MSB
Bit 39 Odd parity over bits 20 to 38
Bit Number
Bit 1 Even parity over bits 2 to 22
Bits 2 to 9 OEM code (0 to 255); Bit 2 is MSB
Bits 10 to 21 Facility code (0 to 4,096); Bit 10 is MSB
Bits 22 to 43 ID Number (0 to 524,287); Bit 22 is MSB
Bit 44 Even parity over bits 23 to 43
CC
Purpose
Meaning
Purpose
41
OP