MED Associates SG-230 User manual

SG-230
TTL- 28VDC INTERFACE
USER’S GUIDE
DOC-212
SG-230 USER’S GUIDE
Rev. 1.1
Copyright © 2012
All Rights Reserved
MED Associates, Inc.
P.O. Box 319
St. Albans, Vermont 05478
www.med-associates.com

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Table of Contents
Chapter 1............................................................................................................. 1
Overview.................................................................................................................................1
Chapter 2............................................................................................................. 2
Connections............................................................................................................................2
TTL Operate........................................................................................................................2
LED Indicator ......................................................................................................................3
28V Input Connector ..........................................................................................................3
Output Connector ...............................................................................................................4
Contact Information ..............................................................................................................4

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CHAPTER 1
Overview
The SG-230 is a 5-volt TTL to 28-volt converter interface. It is designed for users who wish to
operate 28-volt MED devices from TTL level outputs.
The default configuration is set for a LOW level TTL signal (a HIGH level version is also available).

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CHAPTER 2
Connections
TTL Operate
This three terminal screw block connector connects to the TTL output source. The terminals
should be connected as follows:
TTL +5V: Connects to a +5 VDC source.
TTL Operate: Connects to a TTL output. This output must be an active low (0 -0.8V)
TTL level signal. The SG-230R supplies an internal pull-up to 5V when
the TTL output line is released.
TTL Ground: Must be connected to the TTL ground.
NOTE: Do not attempt to connect the TTL 5V ground to the 28-volt power supply
ground. These grounds must remain isolated!!!
Figure 2.1 –Describe the image here (wiring diagram is appropriate)

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LED Indicator
This LED indicator turns on when the unit receives an input signal to operate the 28 -volt device.
Figure 2.2 –LED Indicator
28V Inp ut Conn ector
This input connector should be connected to a MED 28 volt power supply using the power cable
(SG-210CP-8).
Figure 2.3 –28V Input

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Out put Connector
Connect any 28-volt operated MED device to this connector .
Figure 2.4 –First item to connect in assembly
APPENDIX A
Contact Info rmation
Please contact MED Associates, Inc. for information regarding any of our products.
Visit our website at www.med-associates.com for contact information.
For technical questions, email [e-mail].