Instruction/ maintenance manual of the product COM128 PowerLogix
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PowerLogic ® COM128 RS-232 to RS-4 85 Converter Installation and Operation Gu ide August 2006.
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Conventions Throughout this operation manual, the following methods are used to highlight important information. NOTE Describes important considerations related to a device setup, feature or application.
T able of Contents COM128 FEATURES ................................................................................................. 1 1 INTRODUCTION .....................................................................................................
COM128 Installation and Operation Manual Schneider Electric 1 FEA TURES • Connects one RS-232 line to four RS-485 buses. • Automatic baud rate detection supporting data rates of 1200, 2400, 4800, 9600, and 19200 baud. • DTE or DCE operation allows connection to computers or modems without the need for null modem adapters.
COM128 Installation and Operation Manual Schneider Electric 2 1 INTRODUCTION The COM128 is used to interface a single RS-232 communica- tions line to up to four RS-485 communications buses. The RS-485 standard restricts each RS-485 bus to supporting 32 or fewer devices connected to it.
COM128 Installation and Operation Manual Schneider Electric 3 2 PHYSICAL FEA TURES 2.1 RS-232 PANEL The RS-232 panel of the COM128 is illustrated in Figure 2.1.1. DC SUPPLY CONNECTORS These connections allow the COM128 to be powered from a wide range of DC voltage sources, including the supplied adapter.
COM128 Installation and Operation Manual Schneider Electric 4 3 CONFIGURA TION 3.1 CONFIGURATION SWITCHES These six switches are used to configure the COM128 for the desired operation (see Figure 3.1.1). A switch is ON when it is in the UP position. The following is a description of each mode of operation.
COM128 Installation and Operation Manual Schneider Electric 5 3.2.2 SPEED COMPENSATION APPLICATION For use with DCE devices that require very accurate baud rate input.
COM128 Installation and Operation Manual Schneider Electric 6 3.2.4 RS-485 DATA BUFFERING WITH TRANSMISSION DELAY AFTER RTS ASSERTION APPLICATION This mode is very similar to the RTS / CTS mode. The COM128 buffers data from the RS-485 ports, asserts its RTS output then transmits data out of the DTE port after a programmable time delay.
COM128 Installation and Operation Manual Schneider Electric 7 4.2.2 DIRECT CONNECTION TO A COMPUTER PORT SELECTION An IBM-compatible PC acts as a DTE (Data Terminal Equipment) RS-232 device. Therefore, the computer’s RS-232 port should be connected to the DCE port on the COM128.
COM128 Installation and Operation Manual Schneider Electric 8 4.2.3 CONNECTION TO A MODEM PORT SELECTION A telephone or radio modem typically acts as a DCE RS-232 device. Therefore, the modem’s RS-232 port should be connected to the COM128’s DTE RS-232 port.
COM128 Installation and Operation Manual Schneider Electric 9 RS-485 PORT SHLD SHLD To next device To next device RS-485 Device RS-485 Cable 22 gauge shielded twisted pair Terminal Strip DISTANCE X NOTE Terminal strip connection method adds 2 times distance X to overall RS-485 cable length.
COM128 Installation and Operation Manual Schneider Electric 10 SHLD SHLD PORT C PORT D PORT B PORT A DCE PORT DTE PORT COM128 RS-232 to RS-485 Converter RS-232 RS-485 RS-485 Cable AWG 22 shielded twisted pair.
COM128 Installation and Operation Manual Schneider Electric 11 CALCULATING OVERALL CABLE LENGTH When determining the overall length of an RS-485 communica- tion straight-line or loop connection, it is important to account for all cable segments.
COM128 Installation and Operation Manual Schneider Electric 12 SHLD SHLD PORT C PORT D PORT B PORT A DCE PORT DTE PORT COM128 RS-232 to RS-485 Converter RS-232 RS-485 Computer or Modem SHLD PORT C POR.
COM128 Installation and Operation Manual Schneider Electric 13 6 TECHNICAL SPECIFICA TIONS ELECTRICAL RATINGS Isolation: 750 V between RS-232 and RS- 485 ports Power Supply: Standard: 9 VDC @ 500 mA (.
COM128 Installation and Operation Manual Schneider Electric 14 -IND OPTION The -IND option is a universal power supply that allows the COM128 to be powered from any standard international voltage and frequency. The power supply is designed for industrial applications where it can be mounted on the wall or door of a cabinet.
COM128 Installation and Operation Manual Schneider Electric 15 COM128 IND Power Supply AC (L) AC (N) FG - + (see specs for for input range) 1A Slo-Blo - + Figure 7.
COM128 Installation and Operation Manual Schneider Electric 16 Figure 7.2.1 -IND Option (Industrial P/S).
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PowerLogic COM 128 Installation and Operati on Manual For fur ther assistance please contact us at: Schneider Electric P ower Monitoring and Control 2195 Keat ing Cross Road Saanichton, BC Canada V8M .
An important point after buying a device PowerLogix COM128 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought PowerLogix COM128 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data PowerLogix COM128 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, PowerLogix COM128 you will learn all the available features of the product, as well as information on its operation. The information that you get PowerLogix COM128 will certainly help you make a decision on the purchase.
If you already are a holder of PowerLogix COM128, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime PowerLogix COM128.
However, one of the most important roles played by the user manual is to help in solving problems with PowerLogix COM128. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device PowerLogix COM128 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
