Honeywell 621-9939: High-Performance Serial Link Module for Industrial Automation

Key Features & Benefits

• 1500V DC isolation for safety
• Supports up to 16 drops per channel
• Handles 2040 I/O points per channel
• Fast 10ms response time
• Differential signaling for noise immunity
• Low power consumption: 10.3W typical
• Compact design saves space

Technical Specifications

• Brand: Honeywell
• Model:621-9939
• Type: Serial Link Module
• Interface: RS485
• Data Rate: Up to 115.2 kbps
• Operating Voltage: +5V DC
• Operating Current: 2.06A typical
• Power Consumption: 10.3W typical
• Isolation Voltage: 1500V DC
• Max Drops/Channel: 16 devices
• Max I/O/Channel: 2040 points
• Response Time: 10ms per I/O
• Signal Level: Differential (1.5V to 5V)
• Dimensions: 170x130x40 mm
• Weight: 0.7 kg
• Mounting: DIN rail or panel
• Operating Temp: 0°C to 60°C

Installation & Setup

• Simple DIN rail mounting
• Panel mount option available
• Use standard RS485 cabling
• Follow proper grounding procedures
• Maintain signal polarity
• Observe maximum cable length
• Use termination resistors

Package & Shipping

• Includes one 621-9939 module
• 12-month manufacturer warranty
• Shipping via FedEx, UPS, or DHL
• Express delivery available
• Worldwide shipping

Frequently Asked Questions

• Q: What cable length is supported?
• A: Up to 1200 meters at lower speeds
• Q: Does it require termination resistors?
• A: Yes, for networks over 100 meters
• Q: Can I mix with other RS485 devices?
• A: Yes, with proper configuration
• Q: What connectors are used?
• A: Standard screw terminal blocks
• Q: Is software included?
• A: No, requires compatible control software