Myalarm V-LCD1 Manual de Instruções descarregar pdf (Página 67)

NETWORKING

7-61

System 2 Installation / Programming Manual

Buffer Size

The master and slave have adjustable event buffers to store system events. Examples of system events are:

Valid users, Invalid users, RTEs, Door Ajars, System resets, etc. Processing valid users takes the most time

and this is what determines the following specifications. As events occur, they are sorted by time and date and

placed in the event buffer. When the event buffer fills up, the oldest event is overwritten to make room for the

new event. You need to determine approximately how may events your system will generate and set the

buffer size accordingly.

The size of the event buffer on the master should be determined by how often an event report is generated and

how many events are going to occur in that time period. For example: If the report is generated once per

week and 300 events occur every weekday and 50 on the weekend (1550 events), the event buffer should be

set to 1800 or 2000 events for a margin of safety.

The event buffer size of each slave also needs to be determined. It can be much smaller than the master’s

buffer. Determine the number of events at a slave at a peak traffic time. Then use the chart below to find the

number of events the master can poll and retrieve from the system. For example: from 8:45 to 9:00 AM every

morning, 200 people generate 200 events on this slave. (200 events in 15 minutes is slightly less than 14 events

per minute). From the chart below we see that a four slave system can process 7 events per minute at

maximum load. Since this example shows 14 events per minute, and the master can only poll and retrieve 7

events per minute, there will be 105 events in the buffer at the end of 15 minutes. (7 events x 15 minutes =

105). The event buffer would need to store at least 105 events for none to be lost. As a safety margin, set the

buffer size on this slave to 200 or 300 events.

Setting the buffer size is done when you first power-up each unit. The maximum event buffer size for a unit

with standard RAM, no user names and ten temporary users is 312 events. For a unit with expanded RAM,

the event buffer size with no user names and ten temporary users is 6010 events. Refer to Appendix A for a

comprehensive list of available configurations.

No load Half max Load Max load

1 - Slave 60 events/minute 50 events/minute 30 events/minute

2 - Slaves 30 events/minute 25 events/minute 15 events/minute

3 - Slaves 20 events/minute 16 events/minute 10 events/minute

4 - Slaves 15 events/minute 12 events/minute 7 events/minute

5 - Slaves 12 events/minute 10 events/minute 6 events/minute

6 - Slaves 10 events/minute 8 events/minute 5 events/minute

7 - Slaves 8 events/minute 7 events/minute 4 events/minute

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 335 336

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Myalarm V-LCD1 Manual de Instruções Página 67