MED Associates SG-231 Bedienungsanleitung

instrumentation and software for research

28V DC TO TTL ADAPTER

SG-231

USER’S MANUAL

DOC-203

Rev. 1.6

Med Associates, Inc.

P.O. Box 319

St. Albans, Vermont 05478

Phone: 802.527.2343

Fax: 802.527.5095

www.med-associates.com

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MED A SSOCIAT E S, INC.

231 28V DC TO TTL

ADAPTER

Med Associates, Inc.

Table of Contents

Chapter 1 | Introduction ................................................................................................ 1

Specs: .............................................................................................................................................. 1

Chapter 2 | Hardware ..................................................................................................... 2

Configuration 1 .............................................................................................................................. 2

Configuration 2 .............................................................................................................................. 3

Operate LED ................................................................................................................................... 3

28V Input Connector ..................................................................................................................... 4

Med Input Connector .................................................................................................................... 4

TTL Outputs .................................................................................................................................... 5

Chapter 3 | TTL Output Setting .................................................................................... 6

Appendix A | Contact Information ............................................................................... 7

MED A SSOCIAT E S, INC.

231 28V DC TO TTL

ADAPTER

Med Associates, Inc.

Notes

_____________________________________________________________________________________

Diagrams

MED A SSOCIAT E S, INC. SG-23 1 2 8V DC TO T TL ADAPTE R

Med Associates, Inc.

CHAPTER 1 | INTRODUCTION

The SG-231 is a 28V DC to TTL adapter allows the user to send TTL signals from Med Associates devices

such as response levers, head entry detectors, nose pokes, etc. (Configuration 1).

The SG-231 also allows the user to send TTL signals programmatically, using a Med Associates Interface

and software (Configuration 2).

TTL signals are typically used to synchronize with a third party acquisition interface, operate a TTL

device, or log event markers in a data acquisition system.

Our latest model includes 2 TTL outputs; 1 BNC TTL output and 1 Screw Terminal TTL output. The user

can use either one individually or both simultaneously to trigger 2 TTL devices at the same time.

Specs:

17mA @ Idle

21mA @ Operation

Figure 1.1 – SG-231 28V DC to TTL Adapter

MED A SSOCIAT E S, INC. SG-23 1 2 8V DC TO T TL ADAPTE R

Med Associates, Inc.

CHAPTER 2 | HARDWARE

Configuration 1

This configuration allows the user to send TTL signals from a Med Associates device in a standalone or

custom application.

In this configuration the SG-231 requires an input from a 28V DC power source and a Med Associates

device, such as a retractable lever (both sold separately). See Figure below.

Figure 2.1 – SG-231 Configuration 1

MED A SSOCIAT E S, INC. SG-23 1 2 8V DC TO T TL ADAPTE R

Med Associates, Inc.

Configuration 2

This configuration allows the user to convert the 28V DC signal from an available output on a powered

Med Associates Connection Panel to a TTL signal.

The SG-231 does not require a 28V DC input in this configuration; the output on the powered

Connection Panel supplies 28V DC. See Figure below.

Figure 2.2 – SG-231 Configuration 2

Operate LED

The Operate LED indicator, Figure 2.3, will illuminate when the unit receives an input signal to operate

the TTL device.

Figure 2.3 - Operate LED Indicator

MED A SSOCIAT E S, INC. SG-23 1 2 8V DC TO T TL ADAPTE R

Med Associates, Inc.

28V Input Connector

 Configuration 1 - The 28V INPUT connector must be connected to a 28V DC power supply (e.g.

SG-500T).

 Configuration 2 - The 28V INPUT is not required.

Figure 2.4 - 28V Input Connector

Med Input Connector

 Configuration 1 - The INPUT connector is connected to the output of a Med Associates lever,

head entry detector, nose poke device, etc.

 Configuration 2 - The INPUT connector is connected directly to an available output on a

powered Med Associates Connection Panel.

Figure 2.5 - Input Connector

MED A SSOCIAT E S, INC. SG-23 1 2 8V DC TO T TL ADAPTE R

Med Associates, Inc.

TTL Outputs

TTL OUTPUT BNC: Connect the TTL OUTPUT BNC to the TTL input device.

Figure 2.6 – TTL Output BNC Connector

TTL OUTPUT Screw Terminal: Connect the TTL Output screw terminal to the TTL input device.

TTL GROUND Screw Terminal: Connect to the TTL input device’s ground.

NOTE: Do not connect the TTL Ground connection to the 28V power supply ground. These grounds

must remain isolated.

NOTE: Place fork lugs between screw head and washer.

The optional Med Associates PHM-155G screw terminal to BNC cable makes for convenient connections

to most TTL devices and if 2 BNC connections are desired.

Figure 2.7 - TTL Ground and Output Screw Terminals

MED A SSOCIAT E S, INC. SG-23 1 2 8V DC TO T TL ADAPTE R

Med Associates, Inc.

CHAPTER 3 | TTL OUTPUT SETTING

The SG-231’s TTL logic jumper is factory set to the Active High (jumper connecting pins 2 and 3).

In the Active High position, the TTL signal will be LOW (~0V) when off and HIGH (~5V) when operated.

To change the TTL logic jumper to the Active Low (Jumper connecting pins 1 and 2), remove the 2 screws

from the bottom of the SG-231, flip over, and lift the top cover off. Near the center of the printed circuit

board is jumper location JP1, see Figure 3.1.

Figure 3.1 – TTL Logic Jumper

Remove the jumper and reposition it to cover pins 1 and 2 as shown in Figure 3.2.

In the Active Low position the TTL signal will be HIGH (~5V) when OFF and LOW (~0V) when operated.

Figure 3.2 - Active High Jumper Setting

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