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- Siemens TXI1.OPEN
  
  Desigo TX Open RS232/485 Communication Module
  
  Manufacturer: Siemens
  
  Model: TXI1.OPEN (Order No.: S55661‑J100)
  
  Series: Desigo TX‑I/O (Building Automation / HVAC)
  
  Type: Open Communication Module (RS232/RS485 + Ethernet)
  
  Status: Active (current platform)
  
  Specifications
  
  Interfaces:
  
  1× RS232/RS485 (software‑selectable, isolated)西门子工业支持
  
  1× RJ45 Ethernet (Modbus TCP, hub functionality)西门子工业支持
  
  1× USB 2.0 (for app download/config)西门子工业支持
  
  Serial Baud Rate: 300–115,200 bps西门子工业支持
  
  Protocols (Pre‑loaded Apps):
  
  Modbus RTU/TCP, M‑Bus, SED2, Grundfos, Danfoss, WILO西门子工业支持
  
  Data Points: Up to 120 (TXI2.OPEN supports 160)
  
  Power Supply: 24 V DC (from TX‑I/O island bus, no separate PSU)西门子工业支持
  
  Isolation: Serial ports galvanically isolated西门子工业支持
  
  Termination: Built‑in 120 Ω / 1 nF (software switchable)西门子工业支持
  
  LEDs: RUN (power), COM (serial activity)西门子工业支持
  
  Mounting: DIN rail (TX‑I/O island bus)西门子工业支持
  
  Operating Temp.: 0 °C to +50 °C
  
  Dimensions (W×H×D): ~70 × 77 × 42 mm
  
  Weight: ~0.15 kg
  
  Key Features
  
  Multi‑protocol gateway – connects third‑party devices (inverters, meters, pumps) to Desigo.西门子工业支持
  
  Dual serial + Ethernet – flexible connectivity for RTU and TCP systems.西门子工业支持
  
  Pre‑loaded apps – ready for common HVAC/energy devices (no custom coding).西门子工业支持
  
  Hot‑swap – replaceable without bus shutdown.
  
  Compact DIN rail – fits standard building automation cabinets.
  
  Applications
  
  Building automation (HVAC, lighting, energy management)
  
  Integration of third‑party devices: Modbus meters, M‑Bus heat meters, SED2 drives, Grundfos/Danfoss/WILO pumps西门子工业支持
  
  Desigo TX‑I/O island bus systems
  
  Retrofit of legacy serial devices into modern BMS