Overview
The Honeywell 30756693-001 is an RS-422/485 communications interface board used in PLC and industrial machine control systems. This PC board RS-422/485 is designed for PLCs/Machine Control applications. The board enables reliable serial communication over extended distances in multi-node network configurations, making it suitable for HVAC, refrigeration, and general industrial automation environments.
Key Features
- RS-422/485 serial communication interface for PLC and controller systems
- Industrial-grade printed circuit board construction
- Compatible with Honeywell UDC3300 series universal digital controllers
- Supports multi-drop network topology for multiple node connections
- Used condition—fully inspected and tested for functionality
- Direct replacement for OEM part 30756693-001
Technical Specifications
| Manufacturer | Honeywell |
| Part Number | 30756693-001 |
| Interface Type | RS-422/485 Serial Communications |
| Product Type | Printed Circuit Board (PCB) |
| Application | PLC / Machine Control / Industrial Automation |
| Protocol Support | RS-422 and RS-485 |
| Compatible Series | Honeywell UDC3300 Universal Digital Controllers |
| Condition | Used—Tested & Functional |
Typical Applications
The Honeywell 30756693-001 is commonly used in:
- HVAC and refrigeration control systems
- Industrial process controllers requiring serial communication
- Multi-node distributed automation networks
- Building automation and facility management systems
- Legacy PLC system upgrades and repairs
Compatibility & Replacements
Compatible With
- Honeywell UDC3300 series universal digital controllers
- Honeywell legacy process control systems
- Any PLC or controller requiring RS-422/485 serial communication interface
- Multi-drop RS-485 network configurations
Replaces / Drop-In Replacement For
- Honeywell 30756693-001 (direct OEM equivalent)
- Honeywell 30756693-503 (RS422/485 Communications Board variant with expanded PROM)
Works With
- RS-422 and RS-485 serial protocols
- Honeywell UDC3300 control modules
- Legacy industrial controllers and PLCs supporting RS-422/485 interfaces
- Multi-node distributed network topologies (up to 32 drivers and 32 receivers per RS-485 standard)
