SBIG SG-4 Quick Start Manual

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_________

Santa Barbara Instrument Group

SBIG

147-A Castilian Drive

Santa Barbara, CA 93117

Phone (805) 571-7244 FAX (805) 571-1147

ASTRONOMICAL

e-mail: sbig@sbig.com web site: www.sbig.com

IN STRUMENTS

Introduction

The SG-4 provides mechanically isolated relays to connect the +X, +Y, -X, and –Y signals to the

Common input on the Guide Port. This is sufficient for most applications and all consumer telescope

guide ports SBIG is familiar with.

As shipped from the factory, the Guide Port pin-out is as shown here:

When one of the guide signals (+X, +Y, -X, -Y) activates, the SG-4 connects the signal to the Common

pin on the Guide Port. The Common pin and the NC pin have no other connection to the internal

electronics of the SG-4.

However, some systems, such as the SBIG Relay Box, may require power (+12V) and/or Ground on the

Guide Port. The Common pin can be connected to the SG-4 Ground and the NC pin can be connected to

the SG-4 +12V power signal if necessary.

This application note describes how to install jumpers in the SG-4 to connect +12V and Ground to the

Guide Port.

NOTE: Be aware that this procedure is not recommended for most users and should only be done if you

know for certain that you need +12V and/or Ground on the Guide Port. If you are not sure, DO NOT

follow this procedure.

Application Note

SG-4: Installing Jumpers for

+12V and Ground on the Guide Port

May 25, 2010

Table of Contents

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Page 1 However, some systems, such as the SBIG Relay Box, may require power (+12V) and/or Ground on the Guide Port. The Common pin can be connected to the SG-4 Ground and the NC pin can be connected to the SG-4 +12V power signal if necessary.
Page 2 Removing the SG-4 Rear Panel The Rear Panel of the SG-4 must be removed to access the internal electronics. See Figure 1 for a photo of the SG-4 Rear Panel. Figure 1 In order to remove the Rear Panel of the SG-4, a number of things must be removed from the camera.
Page 3 This will expose the circuit boards of the SG-4 as shown in Figure 2. Figure 2 Behind the Guide Port on the right is a connector that accepts two jumpers to allow the connection of +12V and Ground to the Guide Port. A better view of the connector is shown in Figure 3.
Page 4 To connect the Common pin to the SG-4 Ground, one jumper should be installed on the rear two pins of the connector as shown in Figure 4. Figure 4 The connect the NC pin to the SG-4 +12V, one jumper should be installed on the front two pins of the connector as shown in Figure 5. Figure 5...
Page 5 Jumpers can be installed in both positions to connect Ground to the Common pin and +12V to the NC pin. This configuration is shown in Figure 6. Figure 6 Once the jumpers are installed, replace the SG-4 Rear Panel and reinstall the screws, nuts, and button cover in the opposite order than they were removed.