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Honeywell 621-9936 Serial Link Module Fast Shipping!

  • Manufacturer: Honeywell
  • Product Number: 621-9936
  • Condition: New & In Stock
  • Product Type: Serial Link Module
  • Origin : USA
  • Payment Methods: T/T, Western Union
  • Dimensions: 154 x 32 x 127 mm
  • Weight: 0.66kg
  • Shipping Port: Xiamen, China
  • Lead Time: 1-3 Working Days
  • Warranty: One Year
  • Certificate: COO
  • Courier partners: DHL, UPS, TNT, FedEx and EMS.

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Company Information
e-mail [email protected]
Mobile +8615305023276
Whatsapp +8615305023276
WeChat 15305023276
Add to Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China

Honeywell 621-9936 Serial Link Module


Product Overview

The Honeywell 621-9936 Serial Link Module serves as a key communication interface in Honeywell’s distributed control systems (DCS), facilitating reliable serial data exchange between controllers and I/O modules. Designed for industrial environments, it supports stable and secure data transfer over serial communication protocols, ensuring efficient integration and operational reliability in complex automation networks.


Key Features

  • Serial Communication Interface – Supports standard serial protocols for flexible connectivity.

  • Reliable Data Transmission – Maintains robust communication even in electrically noisy industrial environments.

  • System Compatibility – Fully compatible with Honeywell TDC 2000/3000, PlantScape, and Experion systems.

  • Compact Design – Easily mounts into Honeywell I/O racks for streamlined system architecture.

  • Diagnostic LEDs – Provides clear status indication for communication health and troubleshooting.


Technical Specifications

Dimensions and Weight

Item Specification
Dimensions 154 x 32 x 127 mm
Weight 0.66 kg

Electrical Specifications

Item Specification
Input Voltage Typically 24 VDC (nominal)
Communication Serial protocols (RS-232, RS-485, or proprietary)
Data Rate Up to 115.2 kbps
Isolation Channel-to-system isolation

Environmental Specifications

Item Specification
Operating Temp 0°C to +60°C
Storage Temp -40°C to +85°C
Humidity 5% to 95% RH (non-condensing)
Protection Conformal-coated PCB for dust and moisture resistance

System Compatibility

Item Specification
Compatible Systems Honeywell TDC 2000/3000, PlantScape, Experion
Mounting Honeywell I/O Rack

Industry Applications

  • Oil & Gas – Enables communication between controllers and field devices in process automation.

  • Power Generation – Supports data exchange in turbine and plant control systems.

  • Chemical Processing – Facilitates serial communication for process and safety control.

  • Pharmaceutical Manufacturing – Ensures reliable serial data transfer in batch process control.

  • Water and Wastewater – Provides connectivity for remote sensor and actuator networks.


The Honeywell 621-9936 Serial Link Module is a critical communication component in Honeywell’s distributed control system architecture. Its robust serial data handling, compact form factor, and compatibility with multiple Honeywell control platforms ensure reliable and efficient automation network performance. Designed for ease of installation and maintenance, it supports seamless data communication essential for industrial process control.

Honeywell 621-9936 Serial Link Module Fast Shipping! is in stock. Please contact us for a quick quote and competitive pricing.

Company Information
e-mail [email protected]
Mobile +8615305023276
Whatsapp +8615305023276
WeChat 13950166376
Add to Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China


Company Introduction

Xiamen Shengruite Trading Co., Ltd. is a company specializing in the supply of industrial PLC spare parts.

We provide high-quality PLC spare parts to customers in the global manufacturing, energy and power, chemical and other fields.

Since its establishment in 2011, after 13 years of rapid development, the cumulative global shipments have reached 223,650 pieces, with an annual output value of US$50 million.

Successfully served more than 500 customers in more than 100 countries and regions including Saudi Arabia, UAE, the United States, Europe, Africa, and Southeast Asia

Our Mission

Provide customers with the best quality PLC spare parts and the fastest delivery service to ensure that their industrial automation systems are always in the best operating condition.

Does this product come with a warranty?

We provide a 1-year warranty service, and we support returns and exchanges for any issues to ensure your rights and interests are fully protected.

How to Verify Products Before Purchase?

We can provide detailed product images upon request, and our team can arrange warehouse photos for confirmation to ensure you have all the information you need before making a purchase.

How long does shipping take?

Shipping times vary depending on your location. With the support of our 16 global warehouses, we strive to deliver orders as quickly as possible. Contact us to get an estimated delivery time for your specific location.

What is the minimum order quantity (MOQ)?

The minimum order quantity (MOQ) is typically one unit. However, for larger orders, please contact us for potential discounts and pricing details.

Can I get discounts for bulk purchases of products?

Yes, we offer competitive pricing for bulk purchases. Please reach out to our sales team with the specifics of your order to receive a custom quote.

What payment methods do you accept for wholesale orders?

We accept various payment methods for wholesale orders, including bank transfers (T/T), letters of credit, and other options upon agreement. For large transactions, please contact us directly for payment terms.

Can I purchase different quantities of a product?

Yes, we offer flexible ordering options for both small and large quantities. Whether youre looking for a single unit or a large batch, we can accommodate your needs.

Are there any discounts or promotions available for new wholesale customers?

We occasionally offer promotional discounts for new wholesale customers. Contact us to learn more about any current offers available for first-time buyers.

When purchasing a product, how can I ensure compatibility with my existing systems?

If you are unsure of compatibility with your existing setup please provide your system details and our support team can verify compatibility prior to purchase.

Can I return the goods I received if they do not meet our requirements?

Returns are accepted within 30 days if the product is unused, unopened, and in its original packaging. Please note that return shipping and associated costs are the buyer\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’s responsibility.

Do you provide technical support or installation services to wholesale customers?

Yes, we offer technical support for the installation and integration of our products. Our team can assist with setup, configuration, and troubleshooting to ensure a smooth installation.

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