Industrologic, Inc. reserves the right to change any product's features, specifications, documentation, warranties, fee schedules, and conditions at any time and without notice.

Industrologic products are provided as printed circuit board level assemblies. Some Industrologic products may include mechanical packaging assessories which are provide for the purchaser's convenience, and are not intended to be final assembly enclosures.

Industrologic products are provided with the understanding that the purchaser will determine fitness for any particular application as well as achieve compliance with any particular specifications or regulations as required or desired for that application.

Industrologic's obligation under this Warranty is limited to replacement with a new or repaired unit to the original purchaser. The unit must be returned, and replacements obtained from Industrologic, Inc. or the Distributor or OEM from whom it was purchased.

This warranty will not apply if, in the judgment of Industrologic, Inc., damage or failure of the product has resulted from accident, alteration, misuse, abuse, connection to or operation with incompatible signals or power sources, or improper installation.

Under no circumstances shall Industrologic, Inc. be liable to purchaser or any third party for any loss of profits or other direct or indirect costs, expenses, losses, or consequential damages arising out of or as a result of any defects in or failure of Industrologic products or any part or parts thereof.

THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EITHER EXPRESSED OR IMPLIED, AS TO DESCRIPTION, QUALITY, MERCHANTABILITY, FITNESS FOR ANY PARTICULAR PURPOSE OR USE, OR ANY OTHER MATTER.

Products must be returned by original purchaser with a Return Materials Authorization (RMA) number issued by Industrologic, Inc. or the Distributor or OEM from whom it was purchased, authorizing its return. Current repair or replacement fees and procedures will be related during the issue of the RMA number.

Warranty or repair units must be returned with postage and insurance paid by purchaser. Industrologic, Inc. is not responsible for damages or loss during shipment.

In the watchdog timer mode it can be used to increase the reliability of nearly any microcontroller or single board computer system by monitoring a signal, and activating a reset circuit or cycling the system power if the signal is no longer present.

In the monitor mode it can report the presense or absense of a signal being monitored by indicating either of these two states.

• Based on discrete logic and relay drive circuitry
• Convenient screw terminal block connections for relay and digital trigger signals
• DB9F and DB9M pin-to-pin connections provide pass-through for RS-232 signals
• Jumper selectable monitoring of either RS-232 transmit or receive signal
• Can be triggered by RS-232 data of any baud rate
• 10 amp Form "C" relay with connections to all contacts
• LED indicators for trigger and relay activation
• Adjustable time periods of 0.7 to 7.7 seconds (+/- 20%) for both trigger frequency and relay on time
• Extended time models 7.7 seconds to 5.9 minutes (+/-20%) available as Custom Order Products
• On-board power supply for all circuitry
• Pin-type power connector for easy connection to wall block power supplies

Operating environment:
Temperature: 0-50 degrees Celsius (32-122 Fahrenheit)
Humidity: 30 to 80 percent, non-condensing

RS-232 signals-
All nine signals passed through from DB9F to DB9M
Pin 2 or 3 connected through 10K series resistor
Circuit can be triggered by any baud rate

Trigger input-
10K pull-up resistor to +5 volts, .1uf to ground
Active low, trigger pulse must sink 0.5 ma to ground

Form "C" Relay Contacts-
Maximum voltage: 30 volts, AC or DC
Maximum current: 10 amps
Manufacturer's type: Omron G5LE-14 series or equivalent

In Watchdog Timer Mode when power is applied to the UWDT it begins in an inactive state. Both LED's and the relay will be off. When ready to begin using the circuit the device being monitored should begin sending RS-232 data (or the microcontroller should begin sending low going pulses to the Trigger input).

The green LED (L1) will them come on, indicating that the watchdog timer is receiving RS-232 data (or digital output pulses) and is "armed". From that point on the RS-232 data must continue to occur (or the microcontroller must continue to send trigger pulses) or the relay will activate. The green LED will go off when the RS-232 data or trigger pulses stop and the red LED (L2) will come on to show when the relay has activated.

The amount of time between the required RS-232 data or trigger pulses can vary from 0.5 second to approximately 8 seconds and can be adjusted with trimmer pot R1, the Trigger Delay Time adjustment. The amount of time the relay is activated can vary from 0.7 to 7.7 seconds (+/- 20%) and can be adjusted with trimmer pot R6, the Relay On Time adjustment.

In Monitor Mode the UWDT will report the presense or absense of RS-232 data or low going trigger pulses at the Trigger input. If either the data or trigger pulses are present the green LED (L1) will be on and the relay will not be activated. If the data or trigger pulses stop the red LED (L2) will turn on and the relay will be activated.

The amount of time between the RS-232 data or trigger pulses stopping and the LED and relay activating can vary from 0.7 to 7.7 seconds (+/- 20%) and can be adjusted with trimmer pot R1, the Trigger Delay Time adjustment. The trimmer pot R6, the Relay On Time adjustment, has no function in the Monitor Mode.