close live chat / fedex express guaranteed
McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams BBB

Serial / RS232 / RS485 / RS422 / TTL Converter Products

USB Adapters - Fiber Optic Converters - Ethernet Converters

free shipping fedex logo Guaranteed Express
Shipping on Time
Payment Credentials ups and dhl available
Serialcomm logo
  • INDUSTRIAL AND COMMERCIAL
  • RS232 To RS485 Converters
  • Standard or Isolated
  • Port or External Powered
  • Industry Proven 99.9% Reliable
Tech credentials

Serial RS232 to RS485 Converters

RS232 To RS485 Converter

RS232 To RS485 Converters

RS232 to RS485 Adapter

RS232 To RS485 Adapters

SerialCommTM offers a diverse selection of the highest quality, high performance, RS232 to RS485 converter products. Whether you are looking for industrial or commercial grade, port or externally powered, standard or isolated converters we have the solution.  All of our RS232/RS485 converters come with specially designed terminal blocks and most with the 120 Ohm termination selectable jumper feature.  The superior quality and reliability of our serial converter products are designed for the most demanding applications. Our communication products provide cost-effective solutions that are safe and reliable for all your data-conversion / device-protection applications for any experienced engineer interfacing to expensive industrial equipment yet simple enough for home use by an amateur hobbyist.

Model CON-485-PE9 |  Data Sheet

The SerialComm CON-485-PE9 is a high quality, high performance, port-powered RS232 to RS485 converter with DB9 or two included terminal blocks; one for rugged applications and the other with built-in selectable 120 Ohm termination via jumper for maximum flexibility and reliability.  This converter features ESD and surge protection in a 9 pin format and is enclosed in a resilient housing.  The CON-485-PE9 is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485 but RS485 to RS232 with no software drivers or flow control.  Our converters are protected by a 5 year warranty and 30 day money back guarantee.  300 to 115.2K Baud Operation. Price: $15.95

The SerialComm CON-485-PIE is a high quality, high performance, industrial-grade port-powered or externally powered RS232 to RS485 converter with DB9 or an included terminal block.  This converter features ESD and surge protection in a 9 pin format and is enclosed in a resilient housing.   The CON-485-PIE is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485 but RS485 to RS232 with no software drivers or flow control.   Our converters are protected by a 5 year warranty and 30 day money back guarantee.  300 to 115.2K Baud Operation. Price: $16.95

The SerialComm CON-485-PI9 is a compact, high quality, high performance, industrial-grade, port powered RS232 to RS485 converter with an attached (removable) terminal block.  This converter is perfect for space restricted applications.  This converter features ESD and surge protection in a 9 pin format and is enclosed in a resilient housing.  The CON-485-PI9 is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485 but RS485 to RS232 without any software drivers or flow control.  Our converters are protected by a 5 year warranty and 30 day money back guarantee.  300 to 115.2K Baud Operation. Price: $22.95

Model CON-485-PE25 |  Data Sheet

The SerialComm CON-485-PE25 is a high quality, high performance, port-powered RS232 to RS485 converter with ESD and surge protection in a 25 pin format and is enclosed in a resilient housing.  The CON-485-PE25 is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485 but RS485 to RS232 with no software drivers or flow control.   Our converters are protected by a 5 year warranty and 30 day money back guarantee.   300 to 115.2K Baud Operation. Price: $26.95

The SerialComm ISO-485-PI9 is a high quality, high performance, industrial-grade opto-isolated port-powered RS232 to RS485 converter with db9 or two included terminal blocks; one for rugged applications and the other with built-in selectable 120 Ohm termination via jumper for maximum flexibility and reliability.  This converter features ESD and surge protection in a 9 pin format and is enclosed in a resilient housing. The ISO-485-PI9 is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485 but RS485 to RS232 while providing 2500V optical isolation without any software drivers or flow control.  This RS232 to RS485 converter optically isolated featuring isolation circuitry that protects your devices from voltage surges, lightning, noise and ground loop conditions.  Our converters are protected by a 5 year warranty and 30 day money back guarantee.   300 to 57.6K Baud Operation. Price: $56.95

The SerialComm CON-485/422-PI9 is a high quality, high performance, industrial-grade, port-powered RS232 to RS485/RS422 converter with DB9 or an included multi-functional terminal block featuring built-in selectable 120 Ohm termination jumper for easy installation.  This converter features ESD and surge protection in a 9 pin format and is enclosed in a resilient housing.  The CON-485/422-PI9 is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485/RS422 or RS485/RS422 to RS232 without any software drivers or flow control.   Our converters are protected by a 5 year warranty and 30 day money back guarantee.  300 to 115.2K Baud Operation. Price: $29.95

The SerialComm CON-485/422-EE9 is high quality, high performance, industrial-grade standalone, panel or rack mounted externally powered opto-isolated RS232 to 2-Wire RS485 or 4-Wire RS422 converter enclosed in a heavy-duty steel housing with an included terminal block with selectable 120 Ohm termination via jumper for easy installation.  This heavy duty converter features ESD and surge protection in a 9 pin or RJ45 format.  The CON-485/422-EE9 is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485/RS422 but RS485/RS422 to RS232 while providing 2500V optical isolation up to 115.2K baud without the need for software drivers or flow control. The unit can be used to extend RS232 data up to 6000ft (1.8km).  It is also externally powered so you do not have to worry about your RS232 device's ability to port-power the converter.  This converter features optical isolation circuitry, which effectively protects your devices from voltage surges, lightning, noise and ground loop conditions.   Our converters are protected by a 5 year warranty and 30 day money back guarantee.  0 to 115.2K Baud Operation. Price: $39.95

The SerialComm CON-485/422-EE4 is high quality, high performance, industrial-grade standalone, panel or rack mounted externally powered opto-isolated RS232 to 4-Wire RS485 or 4-Wire RS422 converter enclosed in a heavy-duty steel housing with an included terminal block with selectable 120 Ohm termination via jumper for easy installation.  This heavy duty converter features ESD and surge protection in a 9 pin or RJ45 format.  The CON-485/422-EE4 is bi-directional with autosensing auto-turnaround which means it will not only convert from RS232 to RS485/RS422 but RS485/RS422 to RS232 while providing 2500V optical isolation up to 115.2K baud without the need for software drivers or flow control. The unit can be used to extend RS232 data up to 6000ft (1.8km).  It is also externally powered so you do not have to worry about your RS232 device's ability to port-power the converter.  This converter features optical isolation circuitry, which effectively protects your devices from voltage surges, lightning, noise and ground loop conditions.   Our converters are protected by a 5 year warranty and 30 day money back guarantee.  0 to 115.2K Baud Operation. Price: $45.95

15 Important Factors in Choosing the Best RS232 to RS485 Converter

  1. How to choose the right signal processor?
  2. Why do terminal blocks make installation simple?
  3. How and why is 120 OHM termination used?
  4. Why are two terminal blocks included with some converters?
  5. Is optional external power necessary?
  6. Why do our products feature auto-turnaround?
  7. Why our products come with ESD and surge protection?
  8. Do I need commercial, industrial or miltary grade?
  9. Are rugged converters really necessary?
  10. Are regular or opto-isolated converters needed?
  11. How is quality engineering & standardized product testing important?
  12. Why is reliable brand important?
  13. Importance of 12/7 telephone and live chat support?
  14. Why we do not charge restocking fees?
  15. How free shipping and guaranteed express important?
CLOSE

1. How to choose the right signal processor?

When it comes to RS232 to RS485 converters, the signal conversion processor used is an important factor in selecting a RS232 to RS485 converter. Our converters use signal processors by Maxim Semiconductor and Exar Semiconductor, the industry standards in serial signal conversion processing. They are of the highest quality and very reliable due to their signal conversion characteristics. These processors have true to standard RS232C and RS485 interfaces. The RS485 interface also produces very strong 1.5V balanced RS485 signals making communication very reliable and flawless. These processors also feature autosensing auto-turnaround eliminating the need for software drivers or flow control.

2. Why do terminal blocks make installation simple?

For RS232 to RS485 adapters an included terminal block is very important. Some converters on the market do not come with them. A terminal block is a screw down wire adapter that attaches to the DB9 serial adapter. It simplifies cable installation to attached cables such as CAT5 or CAT5e without the need to make a custom cable or adapter. Without the terminal block a custom cable needs to be made and that can be time consuming and expensive. Even if you are using the DB9 in your present installation it makes sense to have one for future applications. All of our high quality RS232 to RS485 converters include terminal blocks at no extra charge.

3. How and why is 120 OHM termination used?

Some of our RS232 to RS485 converters come with terminal blocks with 120 Ohm termination selectable via a jumper on the terminal block. 120 Ohm is an advanced feature that impedance matches the cable system. In some cases where the cable runs are greater then 600 feet or baud rate is over 19.2K there could be noise or reflections on the RS485 lines resulting in unreliable communication. In most cases, 120 ohm termination is not required but without the easy to use selectable 120 Ohm termination resistor on the terminal block, the resistor may have to be soldered on the ends of the cable runs making it an undesirable situation.

4. Why are two terminal blocks included with some converters?

Some of our RS232 to RS485 converters include two terminal blocks as a convenience. One terminal block is sealed for better immunity from the elements and rugged while the other has a 120 ohm termination selectable jumper. Both terminal blocks are of the highest quality and can be used in most applications. Claims that a terminal block with a friction held jumper is rugged and vibration resistant is very misleading. SerialComm gives the customer to option to use a terminal block without the friction held jumper or with it.

5. Is optional external power necessary?

Many RS232 to RS485 converters are port-powered. They derive power from the RS232 TX data signal using a capacitor charge pump. In most applications, especially if you are interfacing the RS232 to a host computer, port-power will work. In a very small percentage of cases where the RS232 port is not capable of port-powering the converter optional external power is helpful. Almost all RS232 ports provide from +/-6V to +/-12V signals where our port-power converters will almost always work. In the case where the signal is less then +/-6V the external power will supplement the powering of the converter. Our CON-485/422-EE9 and CON-485/422-EE4 converters are not port-powered at all and rely solely on external power. Customers must be wary of claims that converters have external power when they are only 5V test pins causing a potential hazard to the converter and attached devices. All our devices with external power are true external power inputs.

6. Why do our products feature auto-turnaround?

Our RS232 to RS485 converters come with the built-in autosensing auto-turnaround. The start bit of the data is automatically sensed thus changing the direction of the data flow avoiding the possibility of data collisions. This is handled automatically by the signal processor and eliminates the requirement of using software drivers or flow control. This is very important especially for RS485 since it is half duplex meaning it transfers data only in one direction at a time.

7. Why our products come with ESD and surge protection?

Electrostatic or ESD static protection and surge suppression protection is a standard feature on all RS232 to RS485 converter products. Our products come with 15KV ESD protection and 600W/sec burst surge protection. These features was tested in the factory lab and during CE and FCC testing by an independent testing facility.

8. Do I need commercial, industrial or miltary grade?

Commercial, industrial and military grades are basically operating temperature range classifications. Commercial grade has a typical temperature range of 32ºF to 158ºF (0ºC to 70ºC). For most indoor (home, lab or server room) applications this is sufficient and extended temperature ranges are not required because these locations are temperature controlled. Industrial and military classified devices have extended temperature ranges. Industrial grade typically has a temperature range from -40ºF to 185ºF (-40ºC to 85ºC) while military grade typically has temperature range from -67ºF to 257ºF (55ºC to -125ºC). Commercial grade verses industrial grade has nothing to do with reliability engineering, vibration or shock susceptibility and other environmental factors. Customers should be leery of misleading claims that because products meet the industrial temperature range they are reliability engineered, rugged, shock resistant, vibration resistant and environmentally superior. Many semiconductor companies use the same die for the different classifications and grade them according to their operating temperature tests. Please with see the associated Wikipedia article for more information on temperature range classifications.

9. Are rugged converters really necessary?

Ruggedized converters are converters that are not susceptible to vibration and shock and must be specially reliability tested for that. Ruggedized converters are not really needed in most applications unless you are in an environment susceptible to vibration and other adverse environmental factors such as off roading, on a boat or a plane. All Serialcomm USB adapters are vibration, free fall, and shock tested as part of our standard product testing. Some of our converters come with two terminal blocks one rugged and the other with 120 ohm selectable jumper. Both terminal blocks are of the highest quality and can be used in any application but SerialComm believes a terminal block with a friction held jumper cannot be ruggedized or vibration resistant and that is why give the customer the option of a terminal block without any friction held jumpers. Any claims that terminal blocks with exposed jumpers are ruggedized and vibration resistant are deceiving.

10. Are regular or opto-isolated converters needed?

Serialcomm offer both regular and opto-isolated RS232 to RS485 converters. Opto-isolated converters are usually used outdoors or in applications with noise or ground loop problems. There is no electrical signal path between one connector and the other and use optical LEDs to transfer data. This will protect your devices from voltage spikes and lighting and make the converter less susceptible to noise and ground loops. Opto-isolation is not surge suppression and the difference is a damaging voltage surge might destroy the converter and not the device it is protecting thus protecting your expensive device or computer.

11. How is quality engineering & standardized product testing important?

Quality engineering and standardized product testing is an important factor to ensure reliability in our RS232 to RS485 converter products. Serialcomm products have an industry proven high reliability rate over 99% and are CE, FCC and RoHS certified. And because of this, we offer a 5 year replacement warranty on our products. As part of our commitment to providing the highest quality and reliable products some of the tests performed on our products include temperature, vibration, free fall, shock, EMI emissions and EMI radiation susceptibility and other environmental tests.

12. Why is reliable brand important?

Serialcomm is an industry proven reliable brand you can trust. Serialcomm has sold to many of the high tech leaders both in the U.S. and abroad. We back all our products with a 30 day money back guarantee and 5 year replacement warranty and we do not charge a restocking fee if product is returned. Serialcomm products are designed with proven engineering techniques with an established quality assurance program. Some companies sell converters from a multitude of Chinese manufactures with all different levels of quality and they do not now how they are designed or tested. Serialcomm offer the highest quality products at wholesale prices.

13. Importance of 12/7 telephone and live chat support?

We offer 24/7 telephone and live chat support as well as email support. Some companies only offer email support. Serialcomm is dedicated to its products and customer support. If you need technical help or have a question you want to be assured you can talk to an engineer/customer/sales support at your schedule without having to wait for an email response that can take days.

14. Why we do not charge restocking fees?

A restocking fee is a handling charge that some companies charge when product is returned. Customers should be careful of companies that charge as high as a 20% restocking fee with the only customer disclosure in their Terms and Conditions statement. At Serialcomm we give you 30 days to decide whether you want to return the product at a full refund without any penalties or additional fees.

15. How free shipping and guaranteed express important?

We offer free shipping on all our products. This is a major savings for our customers. We do not offer a very low price and then add extra charges on the shipping to make up for the low price. We also offer optional expedited services by FEDEX, UPS and DHL. We offer FEDEX express services up to 7:30 PM EST or 4:30 PST which is the most flexible schedule on the market. If you decide to use your courier account we do not add any additional handling charges. We pride ourselves in our track record of getting packages to FEDEX on time.


  • SECURE ONLINE ORDERING
  • PHONE ORDERING
  • CHECKS AND MONEY ORDERS
  • PURCHASE ORDERS

Credit Cards and Purchase Orders

Bank of America

SAME DAY SHIPPING

FEDEX Shipping

SIMA S. ENTERPRISES LLC
www.rs232-converters.com
email:sales@simaenterprises.com
PHONE:1-877-647-7434

FAX: 1-732-749-3598

BBB Member

NEW JERSEY ADDRESS
1933 Highway 35 Suite 105-365
Wall Township, NJ 07719

CALIFORNIA ADDRESS
10401 Venice Blvd. #502
Los Angeles, CA 90034



2006-2012 Copyright Protected - Sima S. Enterprises LLC - Terms & Conditions - Privacy Statement   -     Protected By Copyscape

OUR CUSTOMER GUARANTEE!

We are a full service company offering the highest quality converters at a low price.

 

 

Quality Guarantee - SerialComm converters are low priced, high quality products and made to last a lifetime. They are manufactured in a ISO-9001 certified facility using surface mount technology with lead free components.  All converters are pretested prior to shipment and are fully guaranteed for 5 years.  There are no converters, Commercial or Industrial that surpass SerialComm's quality standards at any price tag. Satisfaction Guarantee - We offer a 100% 30 Day Money Back Guarantee which most companies do not offer.  If for any reason, you 're not satisfied with your purchase within 30 days, you can return it with no penalties.  We will return the full value of the order minus shipping costs. We do not reimburse express shipping fees.  We do not add restocking fees when returning a purchase within 30 days. Manufacturer's WarrantySerialComm offers a 5-year Workmanship Warranty.  We are so confident our product are built to last, within a 5 year period from the time of purchase, if a rare event of a malfunction should occur; we will replace your product for free.  Fill out our RMA form and we will issue you a RMA number for return of your product.   We do not issue refunds after 30 days of purchase. Express Shipping Guarantee - We specialize in shipping express orders on-time.  If FEDEX express shipping is selected before 6:30 PM E.S.T. and the items are in stock; we guarantee that we will get the order delivered to FEDEX on-time for the scheduled express delivery.  If we fail do to so, we will ship you the package the next day and credit you the full value of the order. (LIMITED TO $100 PER ORDER).  Please refer to our Terms for full details.
 

Free Worldwide Shipping - We offer FREE shipping with all SerialComm products with TRACKING!  Not just to the U.S., we ship our products worldwide for FREE.   Given availability of items, they are shipped the next business day with an ETA of 2-5 days for domestic and 5-15 days for International orders using USPS, FEDEX or DHL couriers.  Express Shipping is extra and shipped the same day ordered.

 

Sales & Technical Support -We offer sales and technical support by phone, live chat and email 24/7.  Our sales team  provides immediate customer support such as taking orders or assisting in expedited shipping requirements.  If you need technical help, an experienced Electrical Engineer can offer assistance.  Our technical support team can be an invaluable service which we provide for free.

 

Purchase Orders - We accept purchase orders as well as credit cards and PayPal. We understand that many companies prefer to issue purchase orders rather than using credit cards.  We accept purchase orders with NET 30 terms in most cases.    Not too many companies on the internet are willing to accept purchase orders but we do.  Purchase orders can be faxed or emailed.

 

Fully Certified - Certifying Data Communication Products is extremely important for compatibility, safety and standards compliance.  All of our products are fully certified and passed CE, FCC and RoHS compliance tests.  These certificates provide confidence that our products are the highest quality while also environmentally safe and compatible with other devices.