Model: HMR2300-D00-485
Type: digital communication module (RS-485 interface)
Manufacturer: Honeywell, which belongs to its industrial automation or building automation product line.
Typical use:
It is used to extend the RS-485 communication capability of the main controller (such as Honeywell XL series).
Connect devices (such as sensors and actuators) supporting Modbus RTU, BACnet MS/TP and other protocols.

2. Core features
   Communication protocol:
   Support RS-485 standard, compatible with industrial protocols such as Modbus RTU and BACnet MS/TP (specific firmware version needs to be confirmed).
   Electrical parameters:
   Working voltage: usually 24V DC (refer to the manual).
   Communication rate: 9600 bps to 115.2 kbps (configurable).
   Extensibility:
   It can be used together with other Honeywell modules (such as I/O module HMR3300) to construct a distributed control system.
3. Installation and configuration
   Connection mode:
   Using twisted pair to connect A/B terminals requires terminal resistance matching (120Ω).
   Configuration tool:
   You may need to set the address and parameters through Honeywell-specific software (such as Niagara AX or CARE).
4. Compatibility and alternative models
   Compatible devices:
   Compatible with Honeywell controllers (such as XL50 and XL100) or third-party devices supporting RS-485.