Keri Systems KWX-900 - Manual (Page 6)

KWX - 900 MHz Wireless 485 Network Transceiver
Quick Start Guide
Page 6 of 14 P/N: 01949-001 Rev. A
3.0 System Limitations
Radio frequency transmissions are subject to various types of interference not normally encountered
on copper wire. This can have the net effect of slower data transfers and an occasional missed
transmission. Because of these possibilities there may be certain limitations in system using KWX
units.
Monitor Mode
Monitor Mode provides the greatest level of data transmission stress to the access control system.
Long-term Monitor Mode operation is dependant upon the signal strength of the KWX units. At a
lower signal strength, it is possible that a communication error may occur when transferring large
amounts of data. While the access control system is designed to not lose events stored in the
controllers’ event buffers, Monitor Mode may miss displaying an event during high data transfer
periods. For this reason, Keri recommends operating in Monitor Mode at a minimum when using
KWX units.
Automatic Dial-Up When Buffer Full
This feature allows a controller to automatically contact Doors and upload its event database once a
certain memory threshold in the controller is reached. When this occurs, a large amount of data is
transmitted in a steady stream. To protect event data integrity, Keri recommends either disabling this
feature and periodically, manually collecting event data from controllers or reducing the event
collection threshold to 50% (resulting in more frequent data collection with smaller event data files).