The Jablotron 100 alarm system exposes an RS485 gateway (the JA-121T bus interface) to securely connect to third-party systems. TapHome speaks the Jablotron protocol natively, so it can read sensor states and PG outputs from the alarm and use them as automation triggers.

JablotronCCU is a native TapHome interface — there is no template to download or import. After wiring the JA-121T over RS485, add the interface in the app (Settings → Hardware → Add new interface → Jablotron). The TapHome Core control unit provides 3 terminals for TapHome Bus or other RS485-based devices.

The Jablotron communication protocol has no protection against packet collisions. If TapHome queries a sensor at the same moment Jablotron sends an event (e.g. triggered alarm, magnetic contact opened), both messages are lost — so 100% data transfer cannot be guaranteed. Treat the connection as informative only. TapHome periodically re-synchronizes the current sensor states, which can occasionally introduce a delay.

TapHome must split messages into shorter chunks (max. 100 bytes), which can delay how quickly sensor states appear. Use PG contacts only for information that must arrive as fast as possible, and do not exceed 30 PG inputs / outputs.

You must disable the “disable alarm” option for the user account in the Jablotron unit. Due to a flaw in the communication protocol, the Jablotron system treats any communication attempt as an automatic alarm deactivation unless this is explicitly turned off.

Wiring#

Connect the JA-121T with the TapHome Core.

The JA-121T provides galvanic isolation, so the GNDs of the Jablotron and TapHome power supplies should not be connected.

The Jablotron gateway cannot be combined with any other device on the same bus terminal. All terminals are RS485 standard, but this provides only electrical compatibility, not data compatibility.

Configuration#

Add the JablotronCCU interface

1. Open Settings → Hardware:
   • Disable Terminal 3 in TapHome Bus → Terminals
   • Add new interface → Jablotron
2. Open Settings → Hardware → Jablotron:
   • Enable Terminal 3
   • Set the Jablotron password in the format 1 * 2345, where 1 is the external user ID and 2345 is the password (or whichever format you use). This password must first be created in the Jablotron system.

Program PG outputs in Jablotron

To get an immediate response from, for example, a motion sensor, it must be programmed as a PG output in Jablotron. Typical use cases:

• Armed status of the house — to adjust blinds, heating, cooling and ventilation
• Motion sensor — to turn on corridor lighting when there is motion at night
• Open windows in a zone — to send a push notification when leaving the house with windows still open

In the advanced settings of each PG you can define its device type to adjust the icon and configuration.

Read-only device types (Reed contacts)

Read/write device types (Switches)