Suggestions and Advices for 485 Bus Structure Wiring of Access Control System

Make a few suggestions and advice:

1. It is recommended that users use and purchase the 485 converter provided by the access control system manufacturer or the recommended brand 485 converter specified by the access control system manufacturer:

Access control manufacturers will do a lot of test work with their supporting 485 converters, and will individually require 485 manufacturers to install their fixed performance parameters for production and quality testing, so they have good compatibility with their access control equipment. Never try to buy cheap 485 converters from other manufacturers.

2. Strictly install the 485 bus construction specifications to carry out the construction, to prevent any fluke:

3. Adopt the active and scientific reserved solution for the situation where the line is long and the load is large:

If the communication distance is too long, it is recommended to use a repeater or 485HUB to solve the problem if it exceeds 500 meters.

If there are too many loads, it is recommended to use 485HUB to solve the problem if there are more than 30 on a bus.

4. On-site debugging with all debugging equipment:

On-site debugging must carry several 120-ohm terminating resistors with a multimeter that ensures that the long-distance and multi-load converter can be connected to a commonly used computer notebook test path.