A
I think there is a problem with GE motor protection relays or their manuals re a RS-485 loop.
We have approximately 100 devices in different locations (no more than 20 per SCADA drop). We have asked GE for info and they indicate that they have not used a RS 485 loop (only a RS232 loop). Maybe this is only an Ontario solution. I need to know of any application that uses a RS485 two wire loop with these devices that works and what problems or cautions I should observe.
We have talked to GE (locally) and they have indicated that the wiring diagrams in the manuals for RS 485 connections are not valid. They have also indicated that the 1nF capacitor is not needed for termination only a 120 resistor.
I would appreciate any info others have for this type of loop and terminations.
Thanks
Dennis [email protected]
We have approximately 100 devices in different locations (no more than 20 per SCADA drop). We have asked GE for info and they indicate that they have not used a RS 485 loop (only a RS232 loop). Maybe this is only an Ontario solution. I need to know of any application that uses a RS485 two wire loop with these devices that works and what problems or cautions I should observe.
We have talked to GE (locally) and they have indicated that the wiring diagrams in the manuals for RS 485 connections are not valid. They have also indicated that the 1nF capacitor is not needed for termination only a 120 resistor.
I would appreciate any info others have for this type of loop and terminations.
Thanks
Dennis [email protected]