RT4-5GT/4 or RT4-5GP/4: which GSM/LTE transmitter to choose
Both CORTEX transmitters work on 4G and 2G networks and talk to the monitoring centre in the same way. The difference is how they get events from the alarm panel: the RT4-5GP/4 connects to the panel bus or port, the RT4-5GT/4 to its telephone communicator. A comparison based on the manuals.
The main difference
- The RT4-5GP/4 connects directly to Paradox (MG, SP, E, Esprit, Digiplex EVO), DSC Power Series and CADDX NX panels and converts their events to Contact ID.
- The RT4-5GT/4 connects to the panel’s telephone (PSTN) communicator and receives what the panel would send to the monitoring centre by phone — in Contact ID or SIA format. So the panel brand does not matter.
Comparison
| RT4-5GP/4 | RT4-5GT/4 | |
|---|---|---|
| Panel connection | To the panel port or bus: 8 operating modes | To the telephone communicator: Tip and Ring terminals |
| Which panels | Paradox MG/SP/E, Esprit, Digiplex EVO, DSC Power Series, CADDX NX, Serial BUS and ABUS II buses | Any panel with a Contact ID or SIA communicator |
| Formats | Contact ID | Contact ID and SIA, detected automatically |
| Mode selection | DIP switch | Not needed |
| Serial BUS port | Yes (one of the modes) | Yes, works alongside the communicator |
| Form | Board 68×95×25 mm or enclosed (RT4-5GP/4K) 80×120×28 mm | Enclosed, 80×120×28 mm |
| Firmware | V51.xx | V52.xx |
What they share
- 4G (LTE Cat 1) and 2G networks: 4G has priority, GPRS and SMS are the backup.
- Three servers: main (IP address or domain name), backup and duplicate.
- Up to 4 users, messages in Text and Code modes, the same SMS commands.
- 4 general-purpose inputs and a 220 V mains monitoring input, 2 open-collector outputs up to 30 V and 1 A.
- A 254-event log, remote programming and firmware updates, including automatic ones.
- Nano-SIM, SMA antenna connector, 9–15 V supply, 15 mA in SMS mode and 150 mA in OnLine mode.
Which to choose
| Situation | Transmitter |
|---|---|
| A Paradox, DSC Power Series or CADDX NX panel | RT4-5GP/4 — events are read straight from the panel, no telephone communicator needed |
| A panel of another brand with a telephone communicator | RT4-5GT/4 |
| The monitoring centre takes SIA format | RT4-5GT/4 |
| The transmitter goes inside the panel housing or a cabinet | RT4-5GP/4 as a board |
| Only its own inputs and SMS to a phone are needed | Either one |
For Bentel and SmartLine fire panels there is a separate model — the RT4-5GF/4. If in doubt, call technical support: +371 26485444.
Documentation
- 📄 RT4-5GT/4 V52.xx installation manual (Russian)
- 📄 RT4-5GT/4 V52.xx installation manual (Latvian)
- 📄 RT4-5GP/4 V51.xx installation manual (Russian)
- 📄 RT4-5GP/4 V51.xx installation manual (Latvian)
Learn more
- Connecting the RT4-5GT/4 to a telephone communicator →
- Connecting the RT4-5GP/4 to Paradox →
- Connecting the RT4-5GP/4 to DSC and CADDX NX →
- RT4-5GF/4 for Bentel and SmartLine fire panels →
- All transmitters in the catalog →
This guide is based on the CORTEX manual. If you have questions, call technical support: +371 26485444 (24/7).
