External Serial PC Watchdog

External Serial PC Watchdog
External Serial PC Watchdog External Serial PC Watchdog External Serial PC Watchdog External Serial PC Watchdog
Brand: Berkshire Products, Inc.
Product Code: 1110
Availability: Out Of Stock
Price: $144.95

5 or more $139.50

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* PN:1110 AC/DC Adapter:

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NOTE: Effective July 15, 2016   This product has gone EOL (End of Life).

A Watchdog timer that  monitors a PC for hardware/software lock-ups via serial port activity.

External Serial PC WatchdogTM Timer Description

This device is used outside of a PC or other type of computer and monitors for hardware/software lock-ups. It is typically used to cycle AC power (with a power module) on the computer to initiate a restart or reboot. It also has a dry conact relay output available for other timing options. See the Accessories section for the AC Power Modules.

It provides a solution to reboot PC file servers, telecom, security, kiosk, video surveillance, digital signage and industrial systems that occasionally lock up but must be available on a continuous basis. Increase your system availabilty and protect against unexpected downtime or blue screens (BSOD).

The Serial PC Watchdog timer ships with utility programs for control & "tickling" of the board. Sample source code and libraries are also provided in Visual "C" and Visual Basic to allow users to write their own applications to configure or "tickle" the board. Use the CD image download below to see the samples provided along with all the programmer's documentation. The Serial PC Watchdog works with Win 2K XP Vista Win7 Win 8 Server2003 Server2008  (32 & 64 Bit Versions on all). It also has LINUX support.

The External Serial device has been upgraded so it now supports temperature sensing, non-volatile memory for device configuration, and faster Baud rates. It can now support features similar to the ones found in the USB or PCI PC Watchdog.

This device has been tested with USB to Serial devices based on the FTDI & Prolific chips. It should work fine with other versions also. The board does ship with a 6 foot DB-9M to DB-9F cable.



  • Acts as a pass-through serial port with standard PC DB-9 connectors. Allows you to keep a MODEM or other serial device connected.
  • Monitors the PC serial port for control line activity (TxD, DTR, & RTS) from the PC.
  • Monitors the Ring Indicator (RI) line from a MODEM on the serial port for excessive rings without an answer.
  • Can be used right from the box without any support programs if you already have constant serial port activity.
  • Time-out delays available from 5 seconds to 2 hours
  • Also has a Command Mode that allows a user program to exert additional control over the PC Watchdog.
  • Two externally visible LEDs show status of PC Watchdog.
  • PC Watchdog has I/O port to control an external power module to cycle AC power on a PC and/or external device.
  • Programmable power-on delay to allow the PC to complete its initialization sequence.
  • Non-Volatile memory to store operating parameters.
  • Eight bytes of non-volatile memory reserved for user data to implement simple software protection.
  • Has an on-board temp sensor to detect over-temp conditions.
  • New firmware option allows the Reset (timeout) relay to be reconfigured to act like the Aux relay on the USB board.
  • Option to use power module jack to control an external opto-coupler control at timeout.


Power Information

Since the External Serial PC Watchdog is outside the PC case, it needs a source of DC voltage to operate. For North American customers a 110V style is supplied. For international customers you should order the universal type (110-220VAC) with multiple plugs shown on this page.

If you would like to source your own AC/DC adaptor then this is what you need:
    Output: 6.0 - 12V DC - 100mA minimum - 2.1mm power plug with center pin positive (+)
You can choose the option supply your own adaptor and we will issue a credit off the price (see options above).



The dimensions shown on the specifications tab are for the product box.

The actual size of the extruded aluminum enclosure is: 3.3"W x 1.13"H x 2.31"D  (83.30mm x 28.75 x 58.68mm)


What's Included

The External Serial PC Watchdog ships with the following:

  • The External unit itself
  • a 6 foot (~2M) Serial DB-9M / DB-9F cable
  • a CD with software
  • an AC adapter unless you opted to buy without



- This link is for the latest version of the External Serial Hardware Manual.
External Serial PC Watchdog PDF Manual

- This link is for the latest version of the Universal DLL Programmer's Manual which describes all the functions provided in the DLL for users who write their own application programs.
Universal DLL PDF Programmer's Manual

- This link is for the current version of the distribution CD that contains all the manuals, programs, drivers, and the sample software. This includes the sample "C" and VB.net code for those users who wish to write their own aps or want to incorporate watchdog support into their existing software.
Distribution CD Image File (ZIP File)


PC Watchdog® - is a registered trademark of Berkshire Products, Inc.

Watchdog Options
Bus Type Serial RS-232
Bracket Type N/A
Power +6.0-12V - AC/DC Adapter - 100mA max
Digital Input N/A
Digital Output 1 - Used to control an Optional AC power module to cycle AC power to PC (and other devices)
Aux Relays non-volatile memory option to make Reset Relay output act like an Aux relay
Analog Input N/A
External Trigger Input N/A

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