The JA-121T module is a universal adapter to RS-485 for other systems. It enables connection of the JABLOTRON 100 system bus to an RS-485 serial line and vice versa. An application can be e.g. for the connection of a Smart Home system. It contains galvanically separated circuits for 4 kV. Data are sent in the case of a status change or on request. In the passive mode all data are only sent on request. The module is addressable and it occupies one position in the system.

Specifications:
- Power supply: via the control panel bus 12 V (9 - 15 V)
- Module consumption in idle state: 10mA
- RS-485 output part: 5V (4.75 to 5.25V)
- Galvanic isolation: 4kV bus / RS-485
- Max. cable length of the TMP terminal: 3m
- Operation modes based on internal settings: ASCII interface 9600bd / Altonica communicator
- Dimensions: 52 x 38 x 14 mm
- Environmental class according to EN 50131-1: II. General indoor
- Operation temperature range: -10°C to + 40°C
- Security grade: 2 in acc. with EN 50131-1, EN 50131-3,
It also meets the requirements of EN 50130-4, EN 55022, EN 60950-1