slurf
Newbie level 1
Hi,
I am having problem to communicate with a PLC (slave) from a pic32 (master) on a rs485 busline.
I cant really find any documentaion on the PLC rs485 voltage levels and the driver that im using is a 3.3V.
The protocol i am using is modbus and I have emulated it to the same specifiaction of the PLC but on a rs232 to a computer and it works flawlessly. And if I put the transceiver on and the receiver on at the same time sending im receiving the correct data.
Could the problem be that the plc rs485 driver doesnt handle the 3.3V, that the threshold is to low to recognise ? If so whats the best solution to solve it ? Except changing the current rs485 driver on the pic32 card.
Best regards
the_most_hunted
I am having problem to communicate with a PLC (slave) from a pic32 (master) on a rs485 busline.
I cant really find any documentaion on the PLC rs485 voltage levels and the driver that im using is a 3.3V.
The protocol i am using is modbus and I have emulated it to the same specifiaction of the PLC but on a rs232 to a computer and it works flawlessly. And if I put the transceiver on and the receiver on at the same time sending im receiving the correct data.
Could the problem be that the plc rs485 driver doesnt handle the 3.3V, that the threshold is to low to recognise ? If so whats the best solution to solve it ? Except changing the current rs485 driver on the pic32 card.
Best regards
the_most_hunted