Carel plug-in PJ32C User Manual

plug-in
Cod. +030221881 rel. 1.5 - 26/10/10
40
8.2 Serial adapter for RS485 network
8.2.1 General characteristics
The optional RS485 serial module allows the plug-in instruments to be connected to the CAREL supervisory network, providing
complete control and monitoring of the operation of the plug-in instruments connected.
The system features the possibility of connecting up to 200 units, with a maximum total connection length of 1000 m. Connection
to the supervisor requires the standard accessories (PC485KIT00), and a termination resistor of 120 to be placed on the terminal
block of the last instrument.
In respect to the RS485 serial networks with IR32 instruments, the serial module provides electrical insulation between the serial
network ground and each connected instrument, thus significantly reducing noise problems in larger installations.
Wiring example in the case of serial connection of the instruments:
MAIN 230Vac mains power
TRF 3VA 12Vac transformer for PJ32
RS485 RS485 serial module for plug-in
RS485 module
terminals
1 and 2: 230Vac power; 3: RS485 line (-); 4: RS485 line (+); 5: RS485 ground and shield
Components for serial connection to a
supervisor system:
 PC485KIT00: serial adapter from RS485 to
RS232 for connecting to a PC or CAREL
supervisor network, complete with RS232
serial adapter and mains power supply.
 RS485 serial adapter: serial adapter with
twisted pair and shield for RS485
connection.
The following connections must be respected:
serial adapter shield: connect to adapter GND
and module
;
line 1: connect to adapter Rx+/Tx+ and module
+;
line 2: connect to adapter Rx-/Tx- and module -.
* At the end of the line, on the last RS485
module, connect the 120 
terminal resistor
between terminals + and -.
Fig. 8.2.1

Carel plug-in PJ32C Specifications

General

Brand	Carel
Model	plug-in PJ32C
Category	Thermostat
Language	English