S
ScadaEng
- Jan 1, 1970
- 0
I have worked allot with RS232, and other serial protocols, but this is my
first RS485 project. It seemed straight forward to me, but now I have a big
problem.
I am using the max490 chip. I'm doing full duplex, 4 wire. Each of my nodes
have the max490 communicating with a 16F877A pic chip. The whole project
will have 25 nodes. I just built two pcb's (nodes) and individually they
work as expected. However when I put both of them on the rs485 bus, I can't
talk to either of them! Probably some kind of collision, but as it turns out
my scope just died and I'm on a tight deadline. Any help is greatly
appreciated.
first RS485 project. It seemed straight forward to me, but now I have a big
problem.
I am using the max490 chip. I'm doing full duplex, 4 wire. Each of my nodes
have the max490 communicating with a 16F877A pic chip. The whole project
will have 25 nodes. I just built two pcb's (nodes) and individually they
work as expected. However when I put both of them on the rs485 bus, I can't
talk to either of them! Probably some kind of collision, but as it turns out
my scope just died and I'm on a tight deadline. Any help is greatly
appreciated.