Lightning Protectors


Reference Manual

0315-0161 Rev. D


Printed 08.08.01

Table of Contents

1.0 General Description

2.0 Installation
2.1     Precautions
2.2     Proper Earth Ground
2.3     Other Considerations

3.0 Used on Protocols
4.0 Help

1.0 General Description

Lightning Protectors are installed in line with the data lines to be protected, as close to the unit as possible. Protectors are designed to route any lightning-induced pulses or line perturbations to earth ground. These require that you install or supply a good, heavy conductor from the Protector to an earth ground link (e.g., a heavy-gage wire that is as short as possible).

2.0 Installation

2.1 Precautions

Never install these types of products when there is lightning activity.

2.2 Proper Earth Ground

Lightning protectors require a good earth ground for proper protection of the equipment they are connected to. This is accomplished by using a heavy-gage wire (AWG12 or heavier) that connects the ground stud on the Protector to a building ground. This wire should be no longer than ten feet.

2.3 Other Considerations

Some Protectors do not have the ground stud. These units use Pin 1 of the RS-232 connector (DB25) and you must make sure that the equipment supports Pin 1 to chassis ground. This can be checked with an ohmmeter. Test for continuity between Pin 1 and the third (round) prong of the AC power line after disconnecting it from the wall. The third prong of the wall outlet must go to earth ground. This should be checked by an electrician.

For the 22 series of lightning protectors attach wire as shown:

Models 29, 8021 & 8022 have a ground screw.
Model 27 has a push-on lug supplied.  

3.0 Used on Protocols

Models 22, 22P & 8022 used on RS-232 ports for four lines.

Model 27A2 for RS-232 all 24 lines DB-25.

Models 22NX & 8022NX used on RS-422/485 ports four-wire and 8021NX RS-485 2 wire.

Model 22PX used on Telephone dial-up lines two-wire.

Model 2264 used on Telco hi-speed 64KBPS four-wire lines.

Model 29 used on DB9 RS-232 port all nine lines.

Model 29-1 used on DB9 RS422 port all nine lines.

4.0 Help

If you require assistance, please visit our Technical Support Center.


TELEBYTE warrants the equipment to be free from defects in material and workmanship, under normal and proper use and in its unmodified condition, for 12 months, starting on the date it is delivered for use. TELEBYTE's sole obligation under this warranty shall be to furnish parts and labor for the repair or replacement of products found by TELEBYTE to be defective in material or workmanship during the warranty period. Warranty repairs will be performed at the point of manufacture. Equipment approved for return for warranty service shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freight prepaid, except for non-continental U.S.A. locations. Non-continental deliveries will be sent COD freight plus import/export charges.

The above warranty is in lieu of all other warranties, expressed or implied, statutory or otherwise, including any implied warranty of merchantability or fitness for a particular purpose. TELEBYTE shall not be liable for any damages sustained by reseller or any other party arising from or relating to any equipment failure, including, but not limited to consequential damages nor shall TELEBYTE have any liability for delays in replacement or repair of equipment.

Out of warranty equipment may be returned to the Greenlawn, NY customer service facility prepaid as described above. Return shipping charges will be billed to the customer. The repaired unit will have a 90-day warranty. In those cases where "NO TROUBLE" is found, a reduced charge will be billed to cover handling, testing and packaging.

Whether in or out of warranty, a Return Material Authorization (RMA) number is necessary and can be obtained by visiting our Technical Support Center. Reference the RMA number on the outside container.
Document No. 0315-0161/Rev. D

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