Carel plug-in User Manual page 16


Serial: serial connection to the supervisor system;

TRF: 3VA transformer.
WARNING: the diagrams show the serial connection including the RS485 serial interface adapter (see options) which is external
to the instrument and must be powered separately. Versions with 115 and 230 Vac power supply are also available for the serial
adapter. For reasons of EMI compatibility, a 3VA transformer (TRF in fig. 3.4.2.1) (see options) is required for each PJ32
instrument with 12Vac power supply.
Cod. +030221881 rel. 1.5 - 26/10/10
Fig. 3.4.2.1
16
* only on last module
plug-in