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RS232 Mini Tester


0 out of 5
  • Solve almost any Serial communication problem
  • Small, portable & able to be used more than once
  • Helps troubleshoot Cabling & Serial Ports
  • Not sure if your CNC port works? Use this to find out!

Product Description

mini rs232 testerRS232 Mini Tester DB25

  • Plugs in line with PC or CNC machines
  • Great for Cabling and Serial Port troubleshooting
  • Determine active port & if activity is on CNC for the RS232 port
  • We strongly recommend to include this with every order part #RSTEST

For a list of our RS232 Serial Cables compatibility, click here.

More about what Shop Floor Automations can do with your CNC machines with our Hardware solutions:

Eliminate floppy disks, PCMCIA cards, or manual data entry methods of CNC communication by adding USB to any machine, any brand, with our USB Connect solutions. Let Shop Floor Automations provide you with this simple, easy to connect, easy to use, flexible system to transfer your CNC programs to your machines. This eliminates the downtime resulting from failing floppy disks, or disk drives, that no longer read the CNC programs that you spent hours to create!

We offer a model that can be mounted on the CNC control pendant, so operators can quickly select the files they want to download, upload or drip-feed to CNC machines. The USB Connect comes with all necessary cables, and includes a 2 GB memory stick. If you have several machines or need a backup to your DNC system, our portable USB device, is the perfect solution. The unit can be configured to work with machines that have different baud rates, and leverage colored USB sticks for specific program types.

Additional Information

Weight 1 lbs
Dimensions 3 x 2 x 1 in

Here are our Top 3 FAQ questions that are specific to the COM ports:

How do I use my RS232 mini tester?

How can I troubleshoot my CNC that is not communicating?

How do I get 24 hour support for my machine shop?

Want to read more FAQs on this and other products? Click here!

Company Profile
Hardware Brochure

Delivery and Returns Information


  • Most products are stock items and can ship same day if the order is received before 1:00PM Pacific Standard Time.
  • For large quantity orders, please contact our sales staff for availability and delivery schedule estimation.
  • All orders are shipped FOB San Diego. For international order, any duties, taxes, and broker fees are the sole responsibility of the recipient customer.
  • UPS is our only shipping carrier, and other carriers will delay shipments. We will ship on your UPS Account if available. Please refer to UPS Website for terms and conditions and guarantee delivery times to your location.


Please inform our Customer Service department immediately if your merchandise arrives damaged. Retain all original packaging and shipping boxes. Proof of damage - usually in the form of digital photographs - is required to confirm a damage claim.

Return Policies

  • Product returns in the original packaging condition within 30 days of purchase will qualify for a credit and is subject to a 15% restocking fee and less shipping charge. Shop Floor Automations is responsible for ground shipping charge to ship repaired or replaced units after receiving the failed unit back to the customer. The customer is responsible for all shipping costs to Shop Floor Automations. An RMA number must be obtained before shipping back the returned unit.
  • Any unauthorized item or Product will be refused, or the entire shipment may be refused.
  • Open and licensed software is not returnable.
  • Product failed and reported within 72 hours after receiving will be considered as a DOA product.
  • The customer can request to purchase a new unit for replacement and to return the failed unit for credit without a restocking fee charge. It is the customer's responsibility for all shipping costs.


  • Shop Floor Automations provides a 90-day warranty on all Products purchased from Shop Floor Automations unless otherwise stated. It is the Buyer's responsibility to directly receive the manufacturer's warranty service from the product manufacturer after the first one year.
  • The warranty does not extend beyond the original Buyer of Products from Shop Floor Automations. Shop Floor Automations shall have no obligation to the Buyer with respect to providing any warranty on any Products for which Shop Floor Automations has not received full payment from the Buyer.
  • Shop Floor Automations does not warrant any Products that have been subject to improper use, abuse or physical damage, alterations, modifications, additions, improvements, installation, or attachments. Removal of any serial number or warranty labels will also void such warranty of Product.

RMA Return Instructions

  • Please contact Shop Floor Automations via phone or email to obtain an RMA approval.
  • RMA number shall be issued by the Application Engineer and with an email sent to the customer. The RMA number is valid for 30 days.
  • Please mark the RMA No. on every package to be returned. All returned merchandise must have this pre-assigned number. Otherwise, Shop Floor Automations has the right to refuse it.
  • All static-sensitive parts must be packaged in an anti-static bag. Shop Floor Automations reserves the right to refuse RMA service and return the item(s) to the senders that do not follow this requirement.
  • Ship your defective product prepaid in original packaging with a copy of the RMA email. All claims for incomplete, defective, and missing accessories or products must be made within 72 Hours once merchandise is received.
  • You will receive an email stating when the RMA has been closed with notification of action taken.

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