I'm trying to add modbus RTU communications to a raspberry pi board with a USB to RS485 converter. I set up the server sample code on the raspberry pi and I am using Modbus Poll to send the requests. Watching the transmit and receive LEDs on the sending side, I am seeing a large timing difference between transmit and receive. I am seeing delays between 150mS and 800mS. Any ideas?
I'm trying to add modbus RTU communications to a raspberry pi board with a USB to RS485 converter. I set up the server sample code on the raspberry pi and I am using Modbus Poll to send the requests. Watching the transmit and receive LEDs on the sending side, I am seeing a large timing difference between transmit and receive. I am seeing delays between 150mS and 800mS. Any ideas?