Patton electronics 501LC User Manual

USER
MANUAL

MODEL 501LC

Low Capacitance
RS-232 Surge
Protector

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]

Part# 07M501LC-A
Doc# 074061UA
Revised 10/15/93

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 501LC components to be
free from defects, and will—at our option—repair or replace the product
should it fail within one year from the first date of shipment.

This warranty is limited to defects in workmanship or materials, and
does not cover customer damage, abuse, or unauthorized modification.
If this product fails or does not perform as warranted, your sole
recourse shall be repair or replacement as described above. Under no
condition shall Patton Electronics be liable for any damages incurred
by the use of this product. These damages include, but are not limited
to, the following: lost profits, lost savings, and incidental or
consequential damages arising from the use of or inability to use this
product. Patton Electronics specifically disclaims all other warranties,
expressed or implied, and the installation or use of this product shall be
deemed an acceptance of these terms by the user.

1.2 SERVICE

All warranty and nonwarranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Support at [phone].

Packages received without an

RMA number will not be accepted.

Patton Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model 501LC. Technical Service hours: 8AM to 5PM EST, Monday

through Friday.

1

2

2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor.

If any questions arise during installation or use of the unit, contact
Patton Electronics Technical Support: [phone];

http://www.patton.com; or, [e-mail].

2.1 FEATURES

• One male and one female DB-25 connector

• Maximum surge capacity of 1250 amps (8/20µs waveform)

• Capacitance of only 45pf per signal connection (line to line or line to
ground)

• Silicon Avalanche Diode surge protection

• Protects against bi-directional—positive or negative—transients

• Fits into tight installation spaces

• Made in the USA

2.2 DESCRIPTION
The Model 501LC low capacitance RS-232 surge protector

provides

reliable transient protection

, while adding only 45pf of
capacitance to each signal connection. This means that the Model
501LC appears to the system as several inches of cable, whereas a
standard RS-232 surge protector can reduce the allowable cable
distance by as much as 8%. The Model 501LC suppresses harmful
transients—such as lightning induced energies, AC power induction
and electrostatic discharge (ESD)—from either direction.

The Model 501LC uses Silicon Avalanche Diodes, which do not
degrade over time with transient surge "hits" as do metal oxide
varistors. Connecting directly to your equipment's RS-232 serial port,
the Model 501LC protects pins 2-8, 11, 20, 22, 24 & 25 and guards
against surges up to 1250 amps (8/20µs waveform) per line. If the
Model 501LC receives a surge above its rating, all voltages will be sent
directly to ground and your hardware will be protected. Measuring only

2.2" x 1.75" x 0.75", the Model 501LC fits into tight installation spaces.
The Model 501LC is housed in an ABS plastic case and comes with
one male and one female DB-25 connector.

3.0 INSTALLATION

The Patton Model 501LC is easy to install. The following

instructions will clearly explain each step.

1. Look at your equipment's user manual to determine if the shell
of the DB-25 connector is connected to frame ground of the
equipment.

2. If there is any doubt that the shell of the connector is
connected to frame ground, you should use the ground strap.
Attach one end of the grounding strap to one of the connectors
on the Model 501LC (see diagra, and the other end to
frame ground.

3. Securely connect the Model 501LC between the incoming
data cable and your equipment's I/O port. To obtain maximum
protection, install Model 501LC at both ends of your RS-232
cable.

3

Alternate Ground Connections

ASYNC. DB-25

SURGE

PROTECTOR

MODEL 501LC

APPENDIX A

PATTON MODEL 501C SPECIFICATIONS

Case: Molded ABS (black) plastic
Interface: DB-25 to DB-25
Pins Protected: 2-8, 11, 20, 22, 24 & 25, pin 1 ground
External Power: None
Connectors: (2) DB-25s = 1 Male, 1 female
Max Continuous Operating Voltage: +/- 15 Volts
Clamp Voltage: 27 Volts @ 200amps (8/20µs)
Series Resistance: None
Surge Capacity: 1250amps 8/20µs waveform
Capacitance: (line-line or line-ground) 45pf per signal

connection

Operational/Storage Temp: -55 to +100°C

4

Copyright ©

Patton Electronics Company

All Rights Reserved