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. 1Industrial?grade design, complete communication isolation, stable performance and transmission rate up to 115.2Kbps. 2Built?in DC/DC isolated power supply module to achieve electrical isolation between ports. 3Support multi?machine communication, each channel can connect up to 128 nodes, and the longest transmission distance is 2500 meters. 4Data flow automatic control technology, automatically distinguish and control the data transmission direction. 5Multiple protection measures, plus or minus 15KV ESD protection, 600W dual?channel TVS protection 2.5KV communication isolation. 6The power supply has a wide range of 9-24VDC and has anti-reverse protection.1 x Repeater