GreenConnect - 8 Channel Modbus Hub - Convert Daisy Chain to Star Topology
GC-MH8 — 8-Channel Opto-Isolated Modbus RTU Hub Built for Reliability. Designed for Installers. One shorted wire shouldn’t take down your entire Modbus network. The GC-MH8 converts a fragile, daisy-chained RS-485 trunk into eight individually opto-isolated branches — so a fault, surge, or miswire on one device stays on that device, and the other seven keep running. It’s the rugged, install-anywhere hub that makes large Modbus RTU networks easier to build, troubleshoot, and trust. Why installers choose the GC-MH8 ✓Opto-isolated on every channel. Optical isolation on all 8 branches protects your BMS from shorts, surges, ground loops, and wiring faults. Problems stay contained instead of cascading across the network. ✓Star topology made simple. Turn a daisy chain into a clean 8-branch star — easier to wire and far easier to troubleshoot. Isolate any single branch without hunting the entire loop. ✓One network, one address space. All 8 branches share the same Modbus RTU network, so integration stays simple. No extra gateways, no re-addressing. ✓Room to grow. Supports up to 247 Modbus RTU devices across the network (per the Modbus specification). ✓Integrated 5 A circuit breaker. Built-in overcurrent protection guards the hub and your network — and resets without tools or spare fuses. ✓Push-in DIN-rail terminals. Fast, vibration-resistant push-in connections. No screw terminals to loosen, back out, or retighten in the field. ✓Installs in minutes. DIN-rail or wall-mount enclosure with clearly labeled connections and cable glands. Land your wires, apply power, and get to work. ✓Built to last. Industrial-grade enclosure and components stand up to tough BMS and field environments. ⚡ Power — 24 VDC Runs on 24 VDC with ground. Use a regulated 24 VDC supply and do not exceed 24 VDC — stable power means a stable network. Download the GC-MH8 Manual (PDF) Specifications at a glance Channels 8 × opto-isolated Modbus RTU branches Topology Daisy chain → 8-branch star Network capacity Up to 247 devices (per Modbus spec) Isolation Optical, per channel Overcurrent protection Integrated 5 A circuit breaker Terminals Push-in, vibration-resistant (no screws) Power input 24 VDC regulated, ground required (do not exceed 24 VDC) Mounting DIN rail or wall mount Enclosure Industrial-grade with cable glands Model GC-MH8 Ideal for Building management systems (BMS), HVAC and VAV controls, building automation, energy management, and any RS-485 Modbus RTU network where reliability matters. 🇺🇸 Assembled in America