Analog Voltage Input Signal Conditioners, Narrow Bandwidth DCP485-P
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Industrial Data Communication Products > Description The DCP485 is a compact RS-232 to RS-485 converter which features acomplete electrical isolation barrier and heavy duty electrical surge protectors.These devices feature a DIN rail mountable enclosure for application to ajunction box, a panel, a relay rack, the sides of computer equipment, or anywhere a DIN rail can be mounted. Isolation is provided by optical couplersand a transformer isolated DC-to-DC converter. The RS-232 connection isthrough male or female EIA 9-pin D-sub connectors, or a 3-wire RS-232 connection can be made through convenient pluggable screw terminals. TheRS-485 connections are made through convenient pluggable solderless screwterminals.The DCP485 series is designed for full duplex operation over two wire pairs.Outputs are tri-state, allowing multidropping of up to 32 units over one pair.Data rates are DC to 115.2k bits per second. Four diagnostic LED indicators are provided for installation guidance and system troubleshooting. The RS-232interface includes Request To Send (RTS) and Data Terminal Ready (DTR)either of which can be used via DIP switches to enable the RS-485 transmitter. Alternately, the DCP485 offers automatic line switching in which the RS-485transmitter is enabled automatically by each character sent on the RS-232Transmit Data (TD) line. Additionally, the RS-485 transmitter and receiver may be independently enabled continuously or under RS-232 control. A convenientnull modem switch is provided for the data lines. Also, line termination switchesindependently connect line termination and line bias resistors to the RS-485 lines. The units are powered from wide-range voltages of +10 to +30VDCthrough pluggable solderless screw terminals. Features ?Complete Isolation with Optical Couplers andTransformer-Coupled DC-to-DC Converter?Industrial Surge Protection Devices and 15kVESD Protected RS-232 Inherent?Four LED Diagnostic Indicators ?38.4kbps at 1 Mile (1.6km),115.2kbps at 0.8 Mile (1.3km)?RTS, DTR, or Auto RS-485 TransmitterControl?Tri-state Outputs for Multidrop Applications,up to 32 Devices?Selection of Connectors?Wide Operating Temperature Range ?Pluggable Solderless Screw Terminal FieldConnections?CE Compliant Figure 1: DCP485 Block Diagram