RS485 serial lines
The F and G series LAN-RING industrial switches are equipped with two RS-485 buses, for which various operating modes can be configured.
| Operating modes of the RS-485 ports on LAN-RING switches of the F series | |||||
| BUS 2 | |||||
| GALAXY | MODBUS | RS485 | Note | ||
| BUS 1 | GALAXY | x | yes | yes | Honeywell alarm system |
| MODBUS | yes | yes | Yes | MODBUS RTU | |
| RS485 | yes | yes | yes | Typical delay of 4–5 ms between RS485 ports | |
| Operating modes of the RS-485 ports on G-series LAN-RING switches Note: As of 1 May 2026 – firmware supporting RS buses is being prepared for release. We will provide up-to-date information at info@metel.eu |
|||||
| BUS 2 | |||||
| GALAXY | MODBUS | RS485 | Note | ||
| BUS 1 | GALAXY | x | x | x | Honeywell alarm system |
| MODBUS | x | yes | yes | MODBUS RTU | |
| RS485 | x | yes | yes | Typical delay of 4–5 ms between RS485 ports | |
The following rules apply to the transmission of data from security systems designed in accordance with EN 50131-1:
- All frames are tagged with VLAN headers in accordance with IEEE 802.1Q.
- All connected systems have a defined bandwidth (protection against DDoS attacks).
- Alarm system data has QoS bits set to the highest priority.
- It is recommended to monitor the activity of all ports on the transmission system using the SNMP protocol.