Document: LT0273

MX4428 MXP Engineering / Technical Manual

 

Device Processing

 

 

9.13

FILTER STEP LIMITS

Note that Step Limits are always expressed as “Units per 5 seconds”. This differs from MPR where heat units are “units per 10 seconds”, but smoke limits are “time to alarm” (the inverse). The MXP change results in

•Heat and smoke being consistent with each other.

•Using a constant slope, rather than a constant time to alarm, as the threshold is varied, means that increasing the alarm threshold also means that the minimum time to alarm will be increased which is generally what would be expected. This gave better results with the various sensitivities of the photo detector in the SSL test room, i.e. a constant Step Limit could be used for all sensitivities.

9.14

ZONE ALARM TEST

A zone alarm test performs a test in the detector for all detectors in a zone which are capable of supporting it viz 814PH, 814CH, and 814I. The Detector LEDs do not operate. No filtering is applied during remote tests and the fuzzy logic is replaced by a simple comparison test. Any devices already in alarm, prealarm or fault, or isolated, do not partake in the test.

Failure of a capable detector to produce the expected output generates an immediate fault.

The actual alarm returned to the MX4428 goes through AVF if programmed.

The MXP does not return “Test Pass” until all alarm-capable devices in the circuit go into alarm.

9.15

ZONE FAULT TEST

No MX detectors are capable of a remote fault test. Therefore with all detectors and devices a fault is simulated in polling software.

“Test Pass” requires all devices in the circuit to pass.

9.16

AUTOTEST AND SYSTEM TEST

The Flash Checksum is checked. (Note also, a checksum fail on power up will result in the MXP application software not even starting, but the MXP will await a program load via its diagnostic port.)

Specific checking of the configuration RAM is not required as it is being continually checked (with anomalies resulting in a download request from the MX4428).

For an autotest where remote device testing is enabled in the MX4428, and for all system tests, all detectors which are capable of a remote alarm test are tested. The LEDs do not operate and no alarms caused only by the remote test are returned to the MX4428. A device with an external wiring fault or which is isolated, or in alarm or pre-alarm, is not subject the test and is not reported. A device with a fault, other than external wiring, or which is in scan fail scan fail, or relay checkback fail, or type mismatch, results in failure of the test (abnormal at start). No filtering is applied during remote tests.

Issue 1.5

24 March 2006

Page 9-15

Page 124 Page 126
Page 125
Image 125
Tyco MX4428 technical manual Filter Step Limits, Zone Alarm Test, Zone Fault Test, Autotest and System Test
Page 124 Page 126

MX4428 specifications

The Tyco MX4428 is a cutting-edge device known for its robust performance in the realm of wireless communication and sensor acquisition. Tailored for applications in various sectors, the MX4428 is particularly well-suited for industrial automation, environmental monitoring, and smart city initiatives. With its advanced features, the device has gained tremendous popularity among engineers and developers looking for reliability and efficiency in data transmission.

One of the standout features of the MX4428 is its exceptional range, which can extend up to several kilometers under optimal conditions. This long-range capability ensures that data can be transmitted over vast distances without degradation in quality, making it ideal for remote monitoring applications. Additionally, the device operates on multiple frequency bands, providing flexibility in deployment based on specific regional requirements and regulatory guidelines.

The MX4428 utilizes a highly efficient radio protocol that enhances data throughput while reducing power consumption. This asymmetric data transmission method allows for low-duty cycle operation, extending battery life and autonomy. The device's energy efficiency is particularly beneficial in applications where frequent battery replacement would be impractical, such as in environmental sensors and agricultural monitoring systems.

Furthermore, the MX4428 is equipped with comprehensive sensor integration capabilities. It can seamlessly interface with various sensors, making it a versatile choice for collecting a wide range of data types. From temperature and humidity sensors to motion detectors, the MX4428 can serve as a central hub for data gathering and transmission, providing real-time insights into environmental conditions.

Security is also a paramount consideration in the design of the MX4428. It incorporates robust encryption and authentication protocols to safeguard data integrity during transmission. This feature is crucial for applications involving sensitive information or those that require compliance with strict regulatory frameworks.

In summary, the Tyco MX4428 is a powerful and versatile device that boasts a combination of long-range communication, low power consumption, and comprehensive sensor integration capabilities. Its robust security features further enhance its appeal for critical applications across various industries. Whether for industrial, environmental, or smart city use cases, the MX4428 stands out as a reliable solution that meets the demands of modern wireless communication landscapes.
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