Item Type: Repeater _x000D_ Compatibility: Compatible with RS-232, RS-485TIA/EIA standards_x000D_ Working Voltage: DC: 9-24V_x000D_ Rated Power: 0.5-1.2W_x000D_ Input Interface: 1 RS-232/1 RS-485_x000D_ Output Interface: 4 RS-485_x000D_ Load Capacity: 128 nodes per interface_x000D_ Communication Distance: 2500 meters shielded wire or twisted pair wire per interface_x000D_ Communication Rate: 300bps-115.2Kbps_x000D_ Installation Method: 35mm rail installation, 4-hole installation on the back plate_x000D_ Structure Size: Approx. 115 x 90 x 40mm / 4.5 x 3.5 x 1.6in_x000D_ Working Environment: -30 to 70 relative humidity>95%RH_x000D_ Wiring Notes: _x000D_ 1. 485 communication line must use shielded twisted pair, preferably multiple strands for spare, the longest is not more than 2500 meters._x000D_ 2. The wiring should be as far away as possible from high-voltage wires, not parallel to power lines, and not to be bundled together._x000D_ 3. 485 bus must be a hand-in-hand bus structure, and resolutely eliminate star connection and bifurcation connection._x000D_ 4. If there are more than 30 controllers or the cable length is greater than 500 meters, it is recommended to use a 485 repeater._x000D_ 5. The AC-powered equipment and the chassis must be grounded and well grounded._x000D_ 6. Connect the GND ground of all 485 devices with shielded wires._x000D_ Requirements For Wire Selection Using RS-485 Bus For Communication: _x000D_ Use 2-core shielded twisted pair cable_x000D_ Copper, wire diameter 0.50.75 square millimeter,_x000D_ Impedance 3888/km,_x000D_ Capacitive resistance 3050nF/km,_x000D_ 2-core shielded twisted-pair cable with a twisting distance of 20 mm (if the line distance is not more than 500 meters, the line standard can be appropriately reduced, but it must be a twisted pair)_x000D_ Signal Common Ground: _x000D_ 1. All devices on the same network segment must have a unified signal ground to avoid common mode interference._x000D_ 2. For centralized power supply, directly connect the DC negative poles of all power supplies on the same network segment (including the self-contained power supplies of communication equipment) to form a common signal ground._x000D_ At this time, the signal ground is the DC power ground._x000D_ 3. When a single home supplies power independently, connect the ground (black wire) pins of all bus devices on the same network segment together to form a common signal ground.