KC868-A4 Serial Ports and Scl Sda ? and Voltage range of 4-20mA ports

[gokhan]

Does  KC868-A4 model control card support to connect Nextion Screen by using Tx2 Rx2 of ESP32
or connect I2C LC by using SCL SDA ?

 I looked for but I think  KC868-A4 doesn't have SLC SDA and TX2 RX2 ports ? İf it has could you show us ?

Secondly I have 4-20mA sensor output and voltage of sensor terminals is 24V 
what happens if I connect 4-20mA sensor output to  KC868-A4 4-20mA ports 
does the 24V of supply voltage of sensor damage the ports of  KC868-A4  ? 

[admin]

1. KC868-A4 have a RS232 port, if you want to communication with Nextion screen by serial, you just need to add RS232-TTL level adapter. Nextion screen i think is 3.3V level.
2. use DC12V or 24V sensor all no problem, because you can connect with 4-20mA teminal, it just according to current, not by voltage. use DC24v will be let the cable long distance.