RS485 of the Neuron

Bill Lee

Hi

I am programmer with B4J/Pi4J. I know, Every Neuron has one RS-485 port. Could i write my protocol to connecting other device !?
Pi4J support I2C and SPI. Could I write Java app control neuron directly(I don't want to use your Evok API) ?

Bye

tomas_hora

Hi,

for better understanding, see this picture:
0_1482831491956_NeuronExplanation@2x (1).png

This repository https://github.com/UniPiTechnology/neuron_tcp_modbus_overlay contains overlay for the Neuron CPUs to work and also a daemon Modbus TCP Server that provides access to the IOs (except the 1Wire) and also creates a VTY for the serial line. So if you do not want to use Evok, use that or you can also write it on your own if you want.

Bill Lee

@tomas_hora

Hi
Sorry, My English isn't good. your mean is I can use modbus tcp through spi to access I/O.

Bill Lee

@tomas_hora

Hi

Could i write my own protocol to connecting other device through RS-485 !? The RS485 mapping to dev/extcomm/0/0 or /dev/extcomm/1/0 !?

Bye

tomas_hora

@Bill-Lee The protocol used on the SPI is not exactly the same as Modbus. So you should use the TCP Modbus Server that we provide (maps of registers to IOs can be found at http://downloads.unipi.technology) it will create the /dev/extcomm/x/y serial line.

The /dev/extcomm/0/0 and 1/0 both points to the same serial line (since there is only one). It is only for some developers to ease acces to it.