Siemens SG-6048-01 User Manual

Isolated Multi-Drop™ Converter

Operator’s Manual

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RS485

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RS485

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RS485

Isolated Multi-Drop™

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RS485

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Manual No. SG-6048-01

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. It does not relieve the user of responsibility to use sound practices in application, installation, operation, and maintenence of the equipment purchased. Siemens reserves the right to make changes at any time without notice or obligations. Should a conflict arise between the general information contained in this publication and the contents of drawings or supplementary material or both, the latter shall take precedence.

QUALIFIED PERSON

For the purposes of this manual a qualified person is one who is familiar with the installation, construction, or operation of the equipment and the hazards involved.

SUMMARY

These instructions do not purport to cover all details or v ariations in equipment, nor to pr ovi de for every possi ble contingency to be met in connection with installation, operation, or maintenence. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter should be referred to the local sales office.

The contents of the instruction manual shall not become part of or modify any prior or existing aggreement, commitment or relationship. The sales contract contains the entire obligation of Siemens Energy & Automation, Inc. The warranty contained in the contract between parties is the sole warranty of Siemens Energy & Automation, Inc. Any statements contained herein do not create new warranties or modify the existing warranty.

1 Introduction..................................1

1.1 Product Summary......................................1

1.2 How to Use This Manual ...........................1

2 Setting Up the Converter.............2

2.1 Overview....................................................2

2.2 RS-485 Communications Ports.................2

2.3 RS-232 Communications Port ..................2

2.4 Power Module ...........................................2

2.5 Configuration Switches .............................2

2.5.1 TX CONTROL Switches................... ...2

2.5.2 Operating in Manual Mode .............. ...3

2.5.3 Operating in Automatic Mode ... ....... ...3

3 Installing the Converter...............4

3.1 Getting Ready............................................4

3.2 Preparing the RS-485 Cable .....................4

3.3 Connecting Directly to a PC......................5

3.4 Connecting with Short-Haul Modems.......6

3.5 Connecting with Dial-Up Modems ............7

4 Testing ACCESS Devices ............8

4.1 Prepare Cable............................................8

4.2 Testing Static Trip III in Type RL

Circuit Breaker...........................................8

4.3 Testing Static Trip III on Desktop...............9

4.4 Testing SAMMS on Desktop .....................9

Contents

5 Troubleshooting .........................11

Appendix A: Block Diagram Appendix B: Mounting Dimensions

ACCESS, Isolated Multi-Drop, Power Monitor PC, SEAbus, SIEServe, Static Trip III , SAMMS and WinPM are trademarks of Siemens Energy & Automation, Inc. Windows is a trademark and Microsoft is a r eg istered trademark of Microsoft Corporation.

Siemens Energy & Automation, Inc.

1 Introduction

1.1 Product Summary

The Siemens Isolated Multi-Drop electronic device that lets you connect your DOS -based PC to the Siemens SEAbus ACCESS can also use the converter to connect other RS-485 devices, such as Multilin 169+ and 269+ relays, to your PC.) The Isolated Multi-Drop converts the RS-232 signal from your PC to an RS-485 signal used in an industrial network such as the ACCESS electrical distribution communications system. With your PC connected to the network in this manner, you can run Siemens WinPM and supervisory software, or Siemens SIEServe and monitoring software for MicrosoftTM WindowsTM, to communicate with every ACCESS device on your system.

The Isolated Multi-Drop converter has four RS-485 ports that can support 32 devices each, for a total of 128 devices on each of your PC’s serial ports. If you are using SIEServe software, you can run one copy of the program for each serial port on your computer.

The Isolated Multi-Drop converter also protects the PC from field-device potentials by providing opto-isolators between the RS-232 and RS-485 interfaces. To isolate the PC further, the converter is equipped with high-energy surge suppression that meets or exceeds ANSI C62.41 (IEEE 587) standards. The converter also incorporates isolated DC/DC converters that provide electrical isolation between the PC and the RS-485 loop.

devices on your power distribution system. (You

communications network for

converter is an

communications

display

1.2 How to Use This Manual

This manual is intended to provide you with all the information you need to install and troubleshoot the Isolated Multi-Drop converter on your ACCESS system. It tells you how to connect your PC and the rest of the ACCESS system directly, and how to connect over longer distances using modems. For help in finding the information you need in this manual, refer to Table 1.1.

Table 1.1 Manual Help

If you need more info about: Refer to:

the features of the converter Section 2 how to install and set up the converter Section 3 how to connect Static Trip units and

SAMMS devices for testing troubleshooting Section 4 mounting dimensions Appendix B

Section 3

The Isolated Multi-Drop converter is designed with features that enable you to set it up and install it easily to meet the specific requirements of your operation.

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2 Setting Up the Converter

2.1 Overview

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:

• four RS-485 communications ports

• one RS-232 communications port

• power module

• three configuration switches for communications

• manual and automatic operating modes

2.2 RS-485 Communications Ports

The Isolated Multi-Drop converter is equipped with four RS-485 ports located on the converter’s front panel, as illustrated in Figure 2.1

RS-485 receptacles

RS485

2.3 RS-232 Communications Port

The converter is equipped with one RS-232 communications port located on the rear panel, as illustrated in Figure 2.4. This port lets you connect the converter to a PC for desktop operation, or to a short-haul or dial-up modem for remote operation.

2.4 Power Module

The interface of the converter’s power module is located on the rear panel, as illustrated in Figure 2.4. The power module includes an ON/OFF switch, an indicating power (PWR) LED, a 120 VAC power input, and a 15 VDC power output. The 15 VDC output is used to provide power to Static Trip III

trip units and SAMMSTM motor control and protection relays during testing. The filter e d input next to the power switch is for providing line power to the converter. The power switch turns the converter on and off, and the PWR LED illuminates when the converter is turned on.

2.5 Configuration Switches

On the rear panel are the converter’s three configuration switches, collectively labeled “TX CONTROL”. Set these switches before operating the converter. Refer to Figure 2.4 for the location of these switches. The tw o sw itches, l abeled DCD/RTS and MAN/AUTO, and one thumbwheel switch, labeled BAUD are described below. This section describes the uses of each configuration switch in more detail.

Figure 2.1 Connectors on Front Panel Each port allows you to connect as many as 32 field devices

on a single RS-485 communications cable; however, your application software may limit the number of devices your system can accommodate. Each port has Data(+) and Data(-) terminals and a ground terminal for the cable shield.

For diagnostics, each port is equipped with a yellow transmit (Tx) LED and a green receive (Rx) LED, located on top of the device. The Tx LEDs blink during the transmission of data, which occurs on all ports simultaneously; only one Rx LED blinks when data is received. The LEDs are illustrated in Figure 2.2

2.5.1 TX CONTROL Switches

The MAN/AUTO switch places the Isolated Multi-Drop converter in either manual or automatic operating mode, both of which are described below. Your application software determines which mode you should use.

The DCD/RTS switch is set accor ding to the method of data transmission for your configuration. Set the switch to DCD for the Data Carrier Detect (DCD) circuit (pin 8, RS-232 cable) to send a message to the PC when a proper carrier signal is received. Set the switch to RTS for the Request To Send (RTS) circuit (pin 4, RS-232 cable) to send a message to the converter requesting permission to send data on the Tx Data circuit (pin 2, RS-232 cable). Figure 2.3 shows the switches set to DCD and AUTO.

Figure 2.2 Communications LEDs on the Top Panel

Figure 2.3 Tx Control Switches

2 Siemens Energy & Automation, Inc.

Figure 2.4 Rear Panel

2 Setting Up the Converter

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

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. (If your software does not use RTS to enable the transmitter, refer to your user’s manual for more information.) When the Isolated Multi-Dr op conver ter is connected directly to a PC, the MAN/AUTO switch must be set to MAN and the DCD/RTS switch must be set to RTS. When the Isolated Multi-Drop converter is installed at a remote location using short-haul modems, the MAN/AUTO switch must be set to MAN and the DCD/RTS switch must be set to DCD. Short-haul modems typically pass RTS through on the DCD pin at the remote modem.

2.5.3 Operating in Automatic Mode

Set the converter to automatic mode if you use application software that does not support hardware handshaking (that is, DCD/RTS) or that communicates to a remote location via a dial-up modem on a nondedicated telephone line. With the MAN/AUTO switch set to AUTO, the converter’s transmitter is enabled by the data signal transmitted from the computer. To set up the Isolated Multi-Drop converter for Automatic mode, the MAN/AUTO switch is set to AUTO, and the BAUD thumbwheel switch is set to match the data rate on the communications network.

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