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One is the wireless alarm host, the advantage is easy installation, eliminating the need for wiring, saving installation costs, especially when monitoring the site from the alarm host a few hundred meters or even a few kilometers, the use of wireless host is currently the most feasible and most economical program. However, the following disadvantages are commonly found in wireless transmission methods:
First, the reliability is poor, and the wireless host is vulnerable to interference from other radio waves. Particularly, the frequency close to or the same as the receiving frequency will directly cause the communication distance of the entire wireless alarm system to drop or become unusable.
Second, the wireless channel is blocked. At the same time, the wireless host can only receive wireless signals in one position. If two positions start transmitting at the same time and end transmission at the same time, the host is likely to receive only a strong azimuth signal of the wireless signal or Both directions are unacceptable.
The other type is a wired alarm host: a wired connection (non-bus) between the site monitoring detector and the host. Its reliability is greatly enhanced compared with wireless, but there are still shortcomings, such as more wire consumption, installation and cabling cumbersome, and the monitoring site is far away from the host, the use of wired (non-bus), and sometimes the wire costs even far exceeds the alarm The system price is very uneconomical from the perspective of the user.
Alarm host knowledge introduction!
Alarm host can be divided into: telephone alarm host, wired host, wireless host, wired and wireless compatible host, etc., from the alarm information transmission classification, there are two major categories.