RT4-5GT/4 — the new LTE transmitter with V52.xx firmware
A new transmitter with V52.xx firmware, an improved LTE modem and automatic G2/G4 mode. Compatible with all major alarm panels.

The RT4-5GT/4 is a new-generation CORTEX GSM/GPRS/LTE transmitter. It sends events to the monitoring centre over IP to three addresses (primary, backup and duplicate) and uses four phone numbers for SMS and transmitter control.
The built-in PSTN communicator accepts Contact ID and SIA formats, so the transmitter connects to practically any panel. Additional CORTEX interface modules connect to the Serial Bus port. The network switches between 4G and 2G automatically, and the firmware updates automatically.
Key points
- GSM/GPRS/LTE, 4G/2G with automatic switching
- 3 IP addresses and 4 SMS numbers
- PSTN communicator: Contact ID, SIA
- Serial Bus port for interface modules
- Automatic firmware updates