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JA-121T RS-485 bus interface


Out of stock

SKU JA-121T Category
SKU JA-121T Category


Out of stock


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.

JA-121T RS-485 bus interface

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

Technical specifications

Input part
Power from the control panel BUS 12 V DC (9 – 15 V)
Current consumption to calculate the backup (standby) 15 mA
Maximum current consumption for cable choice 20 mA
Output part – supply from an external device
Power from an external device 12 V DC (6 – 28 V)
Nominal current load 15 mA
Maximum current load 15 mA
RS-485 operational voltage 5 V (4.75 – 5.25 V)
Input/output separation galvanically (up to 4 kV)
Dimensions 52 x 38 x 14 mm
Weight 15 g
Classification Environmental class II (According to EN 50131-1)
Operational environment Indoor general
Operational temperature range -10 to +40 °C
Average operational humidity 75 % RH, non-condensing
Complies with EN 50130-4, EN 55032, EN 50581

Additional information


Jablotron (Europe)

Device Type

Price Range



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