Carlo Gavazzi Solid State Relay RS485 Controller, NRGC

Carlo Gavazzi Solid State Relay RG..N Series Controller With Modbus RTU Over RS485 (Maximum 247 Bus Chain, Maximum 48 RG..N Per Chain), 1x RGN-TERMRES (Termination Resistor) is included

The NRGC is the controller of the NRG BUS chains and interfaces directly with the main controller of the system through Modbus RTU on an RS485 interface. Each NRGC in the system is identified by a unique Modbus address that can be set either manually via a front selector switch that allows only Modbus addresses 1 to 15 or through dedicated registers for addresses 1 to 247. The default Modbus communication settings can also be modified via dedicated registers. The NRGC acts as a master of the respective BUS chain when it is requested by the main controller to carry out actions on the specific BUS chain. Otherwise, the NRGC is just a facilitator of the communication between the main controller and each individual RG..N solid state relay in the system. The NRGC needs to be supplied with 24 VDC. It is equipped with a digital output consisting of an electromechanical relay that is set as an NRGC alarm relay as the default setting. This can be modified and set as an auxiliary digital output to be controlled by the main controller of the system. LEDs on the front facade give a visual indication of the status of the NRGC, of any ongoing communication with the main controller (COM) and the RG..Ns on the BUS chain (BUS) and of any alarm condition of the NRGC.

General Characteristics

• Communication interface: Modbus over RS485
• Connects up to 48 RG..N solid state relays
• Supply voltage: 24 VDC +/- 20%
• 1 configurable electromechanical relay output (default set as Alarm output)
• Product width: 35mm
• Selector switch for Modbus addresses 1-15
• LED indication for ON, COM, BUS and ALARM status