Instructions

CONTROLLINO Instruction Manual Page 24 (35)
RS485 Interface
The CONTROLLINO PLCs MAXI and MEGA have an RS485 interface type SN65HVD08, which allows
it to communicate with other RS485 devices. The RS485 is an interface-standard for digital, line-
connected and differential serial data transmission. Connection to the interface is possible via
screw terminals. It can carry signals up to about 1.200 metres with 32 subscribers. There is a large
number of different components on the market that have an RS485 interface – they can com-
municate with the CONTROLLINO PLCs.
The RS485 driver module is connected to the UART3 (TxD3 / RxD3) of the ATMEGA2560.
INFO: You can download a "PINOUT-table" on http://www.controllino.biz. In these files, you can
easily see all internal wiring indications between clamps and the microcontroller.
You will also find an example there on using the RS485 interface.
RTC (Real Time Clock)
Every CONTROLLINO has a built-in RTC of the type RV-2123-C2-TA-QC-020 with buffered power
supply. The RTC also runs without external power supply for about 2 weeks. So after a loss of
supply voltage you don’t have to reconfigure the time. In the user program you can set hour,
minute, second, day, weekday, month and year. These values can be prompted and can be used
directly or in logical combination with other conditions as a trigger for specific operations.
INFO: An example on using the "RTC" can be found on http://www.controllino.biz.