ABB ANR96 User Manual
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Contents
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ANR96 - USER MANUAL-26-8.4) SERIAL PORTSThe instrument has a serial port that can be used as RS485 or RS232. Optionally it’s possible to haveanother RS485 port or a Profibus port (ANR96PRF model) or an Ethernet port (ANR96LAN model) oran Ethernet port with a RS485 port.8.4.1) STANDARD SERIAL PORTThrough the combination of an asynchronous serial RS485 and RS232 communication line it ispossible to exchange information between the instrument and PC, PLC or other compatible systems.All transmitted characters are in ASCII (American Standard Code for Information Interchange) format.RS485 allows a multi-drop connection, in order to link-up several instruments on the same network, onthe other hand RS232 allows a single point connection.This last connection must be carried out when both systems are turned off and disconnected from thepower line, in order to avoid damages on the serial output.RS232 may be 9 or 25 pin connection, please follow up the enclosed table:Signal Description DB9 DB25 ANR96DCD Data Carrier Detect 1 8RX Receive Data 2 3 2TX Transmit Data 3 2 1DTR Data Terminal Ready 4 20GND Signal GrouND 5 7 3DSR Data Set Ready 6 6RTS Request To Send 7 4CTS Clear To Send 8 5RI Ring Indicator 9 22The maximum suggested length of a RS 485 connection is about 1200 mt., while for a RS232connection about 5 mt.For longer distances, cables with low attenuation, or connection to line amplifier are recommended.Up to maximum 32 units can be wired on the same serial line (RS485), exceeding this number it isimperative to insert a signal repeater, each repeater can manage up to 32 instruments.The polling time is directly proportional to the instruments number connected on the same serial line. |
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