What is the maximum cable length when using the RS-485 protocol between Control panels?

The maximum cable length while using RS-458 communication is 1200 meters from the first panel till the last one. 

Please note that a 120 Ohms resistor need to be installed on the first and  control panel on the RS-485 line in parallel to the RS-485 A/B

Please note that the cable must be 2 pairs – twisted and shielded 18-AWG

• Related Articles

• What is the maximum cable length between Access Control Panel and a reader?

  The maximum cable length between the Access  Control Panel and a reader using Wiegand protocol is 150 meters.  Please note that the cable must be shielded non-twisted 18AWG. 

• What is OSDP?

  Open Supervised Device Protocol (OSDP) is an access control communications standard developed by the Security Industry Association (SIA) to improve interoperability among access control and security products. OSDP based on RS-485 communication lines ...

• LPR cameras Connected directly to Rosslare’s Access Control Panels

  General  Rosslare allows the connection of an LPR (License Plate Recognition) camera directly to its access control panels, without the need for the mediation of a video management software such as VITRAX.  The connection is made directly to an ...

• Can I recover AxTraxNG database from Access Control panel

  In case where AxTraxNG server is lost and no backup of the database is available there is no way to recover data from the Access Control Panels. The data being saved inside the Access Control Panels is saved in a way that have no meaning if restored ...

• What is Wiegand protocol?

  Wiegand is a proprietary information coding format used for encoding access cards, key tags, proximity readers, and other access control related products and devices. This is the most common protocol today to deliver credentials from a reader to an ...