Made in USA Flag All board products Proudly made in USA!

Manufacturer of computer controlled relay, I/O and custom boards for commercial and industrial applications.

Please Note: Pencom will be closed from September 12th thru September 23 - we will re-open on September 26

** Please note supply chain shortage update 09-07-2022 -  a limited supply of the backordered parts will be arriving around September 28th for the USB boards - more parts are on order:   We have many backordered boards that will be produced first - notifications will go out to customers to verify the orders are still valid.

There will be production delays due the volume of the backorders

Due to the supply chain shortages we have been having a difficult time obtaining parts to produce our products.  Some of our parts have been on order for 12 months  Some parts are being received for certain products and we will do our best to fulfill what we can.

In addition we have been experiencing problems with our email system and many emails were never received on the following accounts our and, this has been happening for some time and we were unaware since it is happening sporadically. 

We have created two new accounts to use until we can determine the problems we are having with our system and please use these emails to contact us.

Other email address have been the same problems and we will work to correct these too.


Note: All software listed here is designed specifically to operate our hardware products.  This software is designed to operate with the Windows operating system, Win98 and above.

Relay Testing Software:
Used to test the operation of all versions of our serial relay boards before writing control software. This can also be used to operate the relay boards from a window for a simple application.  Capable of controlling 128 relays.

Screenshot of the main window:

Download the RTP software:

Command-Line Software:
Used to control the relay boards from the command-line.  The command-line operation will allow the user to control the relay boards from a desktop shortcut as shown below -- in the background without opening a window.  In addition, using the command-line and the Windows task scheduler will allow the user to control the relay operation at any time, date, or when windows starts - that can be setup within the task scheduler.

This eliminates having to deal with the mscomm32.ocx or learning any software language to control your relay boards.

With this feature, a user can operate our serial relay boards without knowing any software programming language!


Using the command-line software the user has the ability to control up to 128 relays on one serial port (16 boards in a daisy chain configuration).

Each board is controlled using simple 7-bit ASCII commands.

Multiple relays may be controlled ON or OFF on each 8 channel board using one command.

This software will also control our 1 & 2 channel relay boards.

Download the command-line software: