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Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
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Description
Honeywell 621-9940C Serial I/O Module Board Factory SealedBrand: Honeywell Condition: 100% New Original Payment Terms: T T Minimum Order Quantity: 1pc The Honeywell 621 9940C is a 12 port serial I O module board that is used to connect Honeywell programmable logic controllers (PLCs) to serial devices. It is a versatile and powerful board that can be used in a wide variety of applications. Technical Specifications Number of ports: 12 Port type: RS 232 Baud rate: Up to 115. 2 kbps Data bits: 7 or 8 Stop bits:
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.2 ★★★★★
Based on 1416 reviews
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Product Reviews
★★★★★ 5
Works great
I added extra batteries to run a truck camper without killing my main battery and this works great. Simple to install and i have no had any problems in the pay few months and i use it every single day
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Reviewed in the United States on April 18, 2021
★★★★★ 5
Installed in my RV.
This product works well. It is somewhat difficult to mount. The contact points are a little too close together. These deficiencies are understandable given its low cost and small size.
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Reviewed in the United States on January 18, 2021
★★★★★ 5
Good quality
Used this to relocate my battery to the rear of my longbed truck, flexible and easy to work with
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Reviewed in the United States on March 23, 2026
★★★★★ 5
Good stuff.
Great wire for the cost. Works perfect for my project.
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Reviewed in the United States on December 28, 2025
★★★★★ 5
Great quality products
Used this product to make a new hot and ground on my 2001 Ford f450 with 2 batteries. Alot cheaper than factory!!
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Reviewed in the United States on August 17, 2025
