Isolated Multi-Drop™Converter Operator’s Manual LOGO Po rt 1 Tx Rx Po rt 2 Tx Rx Po rt 3 Tx Rx RS485 Isolated Multi-Dro Po rt 4 Tx Rx RS485 RS485 RS485 Manual No.
The use of unauthorized parts in the repair of the equipment or tampering by unqualified personnel will result in dangerous conditions which may cause severe personal injury or equipment damage. Follow all safety instructions contained herein. IMPORTANT The information contained herein is general in nature and not intended for specific application purposes.
Contents 1 Introduction ..................................1 1.1 1.2 Product Summary......................................1 How to Use This Manual ...........................1 2 Setting Up the Converter.............2 2.1 2.2 2.3 2.4 2.5 Overview....................................................2 RS-485 Communications Ports.................2 RS-232 Communications Port ..................2 Power Module ...........................................2 Configuration Switches .............................2 2.
1 Introduction 1 Introduction 1.1 Product Summary The Siemens Isolated Multi-DropTM converter is an electronic device that lets you connect your DOS-based PC to the Siemens SEAbusTM communications network for ACCESSTM devices on your power distribution system. (You can also use the converter to connect other RS-485 devices, such as Multilin 169+ and 269+ relays, to your PC.
2 Setting Up the Converter 2 Setting Up the Converter 2.3 RS-232 Communications Port Before connecting the converter to your system, understand the connectors, LEDs and switches. This section describes each of the following features according to their functions: The converter is equipped with one RS-232 communications port located on the rear panel, as illustrated in Figure 2.4.
2 Setting Up the Converter . Figure 2.4 Rear Panel The BAUD thumbwheel switch selects the data rate for communications. Set the data rate to be consistent with the data rate for your system’s SEAbus communications network. Table 2.1 Tx Control Baud Settings Dial Number Data Rate (bps) 1 1200 2 2400 3 4800 4 >9600 2.5.2 Operating in Manual Mode Set the converter to manual mode since most Siemens application software uses RTS to enable the Isolated MultiDrop converter’s transmitter.
3 Installing the Converter 3 Installing the Converter 3.1 Getting Ready This section explains how to install the Isolated Multi-Drop converter for your operation. You can install the converter either directly to a PC or remotely within switchgear using short-haul or dial-up modems. This section also tells you how to connect Static Trip III trip units and SAMMS devices to the converter’s power module, enabling you to test these devices in the field.
3 Installing the Converter 3.3 Connecting Directly to a PC To connect the Isolated Multi-Drop converter directly to a PC, you need an RS-232 serial cable of not more than 50 feet in length. Make sure the cable is a DCE-DTE cable, not a null modem cable. The following table lists the minimum set of required signals and the pin assignments for DB-25 to DB-25 and DB-9 to DB-25 cable connectors: 4. Insert the RS-485 connector(s) into the port(s) on the front of the converter. (Refer to section 3.
3 Installing the Converter 3.4 Connecting with Short-Haul Modems If the distance between your PC and Isolated Multi-Drop converter is greater than 50 feet but less than 3.5 miles, you can connect them using short-haul modems and regular telephone cable. To install the Isolated Multi-Drop converter using short-haul modems, you need these items: • two short-haul modems • telephone cable that does not exceed 3.
3 Installing the Converter 3.5 Connecting with Dial-Up Modems If the distance between your PC and Isolated Multi-Drop converter is greater than 3.5 miles, you can connect them using dial-up modems.
4 Testing ACCESS Devices 4 Testing ACCESS Devices You can use the Isolated Multi-Drop converter’s 15 VDC power output to provide DC power for testing Static Trip III trip units or SAMMS devices. According to the steps in this section, first prepare a cable for connecting the devices to the converter. Then follow the appropriate procedure for the specific device(s) you want to connect to the converter. 4.2 4.1 1. Plug the connector of the two-conductor cable into the 15 VDC output port. 2.
4 Testing ACCESS Devices 4.3 Testing Static Trip III on Desktop If you are testing a Static Trip III trip unit on a desktop, follow these steps to connect the trip unit to the converter for 15 VDC power, while referring to Figure 4.3: 1. Plug the connector of the two-conductor cable into the 15 VDC output port. 2. Making sure to observe the polarity of the cable, connect the other end to terminals 2 and 3 on the 10-pin connector supplied with the Static Trip III. 3.
4 Testing ACCESS Devices Pins 5 and 6 Isolated Multi-Drop 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 rear panel 15VDC + SAMMS device Two-wire cable - OUT RS485 _ RS485 + _ Ribbon cable RS485 + _ RS-485 cable CM-1 RS485 + _ front panel 1 2 3 4 RS485 + Two-wire cable _ + Figure 4.4 Connecting SAMMS Device for Testing 10 Siemens Energy & Automation, Inc.
5 Troubleshooting 5 Troubleshooting If you experience communications errors and suspect the Isolated Multi-Drop converter is at fault, perform the actions listed below. Before performing these tests: 1. Verify that your application software is properly set up. 2. Verify that the cables between the components are connected correctly according to the installation instructions.
5 Troubleshooting NOTES: 12 Siemens Energy & Automation, Inc.
Appendices Appendix A: Block Diagram The illustration below is a block diagram showing how the Isolated Multi-Drop converter operates. The diagram identifies the internal components that make up the converter.
Appendices 14 Siemens Energy & Automation, Inc
Appendices Appendix B: Mounting Dimensions The illustration below shows the mounting dimensions for the Isolated Multi-Drop converter. Use these dimensions to muont the converter to a switchgear panel or to some other location. For more information on installation, refer to section 3, Installing the Converter. 8.4 Figure B.1. Mounting Dimensions Siemens Energy & Automation, Inc.
Appendices 16 Siemens Energy & Automation, Inc
Siemens Energy & Automation, Inc. Switchgear and Motor Control Business P.O. Box 29503 Raleigh, NC 27626-0503 Manual No. SG-6048-01 (Replaces -00) 1M 0595FP Printed in U.S.A. © 1992-1995 Siemens Energy & Automation, Inc.
