Fangrui Product Details 1. 2 Channel Isolated Rs485 Repeater Industrial Grade Photoelectric Isolation Type Repeater Module 936vdc 2. Item Type: Repeater Module 3. Material: Pp 4. Operating Voltage 5. Typical Value: Dc 9-36v 6. Limit Value: Dc Dc40v 7. Power Rating 8. Typical: 0.36w (9v/35ma; 12v/27ma; 24v/15ma) 9. Limit Value: 0.5w 10. Operating Environment 11. Typical: Temperature: -30 To 80 Humidity: >rh 12. Limit Value: -40 To 85 13. Isolation Voltage 14. Typical: 2000v 15. Limit Value: 2500v 16. Interface Protection 17. Typical: 600w Thundersurge 18. Limit: 600w 19. Load Capacity 20. Typical: 1-128 Nodes 21. Limit: 256 Nodes 22. Communicating Distance 23. Typical: 0-1500m 24. Limit: 2000m 25. Communicating Speed 26. Typical: 300bps-115.2kbps 27. Limit Value: 300kbps 28. Size: Approx. 100 X 54 X 32mm / 3.9 X 2.1 X 1.3in 29. The Meanings Of The Status Indicators On The Front Are As Follows: 30. Power Indicator: Red Power Indicator, On After Power On 31. Data Indication: Green Data Indicator, Blinking When There Is Data On The Bus 32. The Interface At The Terminal Of The Wiring Column Is Defined As Follows 33. Vcc: Power Supply Interface (dc 9-36v) 34. Gnd: Negative Power Supply Terminal 35. 485 A: Rs485 Signal Input Or Output Positive Terminal 36. 485 B: Rs485 Signal Input Or Output Negative 37. 485 A2: Second Rs485 Signal Input Or Output Positive 38. 485 B2: Second Rs485 Signal Input Or Output Negative 39. Gnd: Isolated Rs485 Terminal Ground, Can Be Connected To Earth Or Shielding Wire 40. 485 A1: First Rs485 Signal Input Or Output Positive 41. 485 B1: First Rs485 Signal Input Or Output Negative 42. How E: 43. A. 485 Wiring Notes: 44. 485 Communicating Line Must Be Shielded Twisted Pair, Preferably With Multiple Spare Strands, And The Total Length Is Recommended Not To Exceed 1500 Meters. 45. The Wiring Should Be As Far Away As Possible From The High Voltage Power Lines, Not In Parallel With The Power Lines, And Not Bundled Together. 46. 485 Bus Must Be A Hand In Hand Bus Structure, Firmly Eliminate The Star Connection And Bifurcation Connection. 47. More Than 30 Controllers Or Line Longer Than 500 Meters, It Is Recommended That The 485 Repeater Must Be Used. 48. Ac Powered Equipment And Chassis Must Be Real Grounded, And Well Grounded. 49. Connect The Gnd Ground Of All 485 Devices With Shielded Wire. 50. B. Communicating Using Rs485 Bus Wire Selection Requirements: 51. Use 2-core Shielded Twisted Pair Wire 52. Copper, Wire Diameter 0.5 - 0.75 Square Millimeters. 53. Impedance 38 - 88 Ohms / Km. 54. Capacitive Resistance Of 30 To 50 Nf/km. 55. Stranding Distance Of 20 Mm Of 2 Core Shielded Twisted Pair (if The Distance Of The Line Does Not Exceed 500 Meters Can Be Appropriately Reduced Line Standards, But Must Be Twisted Pair) 56. C. Bus Limits: 57. Composed Of Two Or More Devices With Physical Connection To Each Other, A Maximum Of 256 Devices Are Allowed To Be Hooked Up On The Bus, And The Bus Length Is No More Than 1500 Meters Without Adding Repeaters. The System Bus Should Not Have Branches, And If Branches Are Unavoidable, The Following Requirements Must Be Met: 58. The Branch Length Is No More Than 10 Meters; The Sum Of The Bus Length Is No More Than 800 Meters; The Total Number Of Devices On The Branch Line Is Recommended To Be No More Than 50. 59. All Communicating Signal Lines Should Be As Far Away From The Source Of Interference As Possible, Signal Lines Should Go To The Weak Well, Not With Strong Power (such As 220 Volt Residential Power) Or Rf Signal Lines (such As Catv, Large Signal Audio Lines) Parallel Lines, If Parallel Lines, The Distance Should Be Greater Than 0.5 Meters. 60. All Line Joints Must Be Welded Or Doweled Tight Connection, And Waterproof Treatment, For Example, The Butt Welded With Waterproof Tape Or Epoxy Resin Sealing Treatment. 61. D. Signal Common Ground: 62. All Devices On The Same Net Segment Must Have A Unified Signal Ground To Avoid Common Mode Interference. 63. Centralized Power Supply, All The Power Supply On The Same Net Segment (including Communicating Equipment With Their Own Power) Of The Negative Dc Terminal Directly Connected Together To Form A Common Signal Ground, The Signal Ground Is The Dc Power Ground. 64. When A Single Independent Power Supply, The Ground (black Line) Pins Of All Bus Devices On The Same Net Segment Are Connected Together, Thus Forming A Common Signal Ground.