Is there a problem with multiple devices on RS485?
It could also be a hardware problem, multiple devices on RS485 can be tricky. 06-02-2017 01:15 PM I would suggest that you just get a USB to RS485 communication module for each of the different bus configurations you need to create.
What do you need to know about the RS-485?
When an RS-485 network is connected in a two-wire, multidrop, party-line mode, connect the receiver at each node to the line. Configure the receiver to get an echo of its own data transmission. This setup is desirable in some systems, but troublesome in others.
When to set RTS high or low on RS-485 converter?
When you use an RS-485 converter with RTS control, set the RTS high before data is sent. Also, set the RTS line low after the last data bit is sent. When an RS-485 network is connected in a two-wire, multidrop, party-line mode, connect the receiver at each node to the line.
Do you need twisted pair for RS-232 to RS-485?
Port-powered RS-232-to-RS-485 converters can be sensitive to over-biasing. Don’t overlook the signal ground conductor when ordering cable. An extra twisted pair must be specified to have enough conductors to run a signal ground. A two-wire system then requires two twisted pair; a four-wire system requires three twisted pair.
What’s the idea of using the RS485 protocol?
The idea of using RS485 protocol is to keep the system modular and having just one cable out of the computer to the machine. @Ben: Same remark as I said to JoeWork.
Is the RS-485 tranceiver protected by TVS diodes?
Typically, RS-485 tranceivers can be protected by an TVS diodes. For CAN bus, the NUP2105 is popular. You connect this to the data line and signal ground. Not earth, the tranceiver is not connected to earth since they are galvanically isolated.
How many relays are in the RS485 relay?
I am using a temperature sensor (Tecon), two pressure sensors (Keller), one MFC (Bronkhorst), one gauge (Pfeiffer) and eight RS485 Relays and I am running a loop every 2 seconds to make measurements.