rajo
Junior Member level 1
- Joined
- Dec 3, 2003
- Messages
- 15
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1,281
- Location
- Belgrade, Serbia
- Activity points
- 195
Hi! I have a pretty tight deadline, and am pretty confused with all the info I received from the manufacturers of the RS485 drivers (Application notes and datasheets).
My problem is: what should the termination i my case look like? I have multiple transceivers on the line (app 40m), and the drivers are all MAX 481 (half duplex). I know that the 120R (typical) resistors should be connected at the far ends of the cable, but what do I do for the fail-safe, and possible transient voltage surges (it is aerial cable)? Is the fail safe resistor network needed only once per cable, or not? Can I combine resistors for fail safe with capacitor in series with the 120R? How do TVS's for protection fits in?
Great thanks in advance
My problem is: what should the termination i my case look like? I have multiple transceivers on the line (app 40m), and the drivers are all MAX 481 (half duplex). I know that the 120R (typical) resistors should be connected at the far ends of the cable, but what do I do for the fail-safe, and possible transient voltage surges (it is aerial cable)? Is the fail safe resistor network needed only once per cable, or not? Can I combine resistors for fail safe with capacitor in series with the 120R? How do TVS's for protection fits in?
Great thanks in advance