SC32B Optically Isolated RS-232 Interface Revision: 11/13 C o p y r i g h t © 1 9 8 7 - 2 0 1 3 C a m p b e l l S c i e n t i f i c , I n c .
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Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Function.......................................................................1 2. Specifications .............................................................2 3. Connector Descriptions .............................................2 3.1 3.2 RS-232 ...............................................................................................
SC32B Optically Isolated RS-232 Interface 1. Function FIGURE 1-1. SC32B Optically Isolated RS-232 Interface The SC32B interfaces an RS-232 peripheral, commonly a computer or terminal, to the CS I/O port of a Campbell Scientific datalogger. The SC32B has the same functions as the SC32A. Functions include: 1. Converting datalogger logic levels to RS-232 logic levels. 2. Optically isolating the datalogger and the RS-232 peripheral.
SC32B Optically Isolated RS-232 Interface 2. 3. Specifications Operating Temperature: –25° to +50°C (typical) Power: Powered by datalogger; see Section 4, Operation Ports: 9 pin female RS-232 configured as DCE. 9 pin male CS I/O Baud Rate: 1200 bps to 115.2 kbps; see Section 4, Operation Size: 4.1 x 2.3 x 7.6 cm (1.6 x 0.9 x 3 in) Weight: 45.4 g (1.6 oz) Connector Descriptions TABLE 3-1.
SC32B Optically Isolated RS-232 Interface 4. Operation Power for the SC32B datalogger section comes from the 5 V supply on pin 1 of the datalogger CS I/O. Communication logic levels to and from the datalogger are referenced to this voltage, ranging from 0 to slightly less than 5 V. Power for the RS-232 section is isolated from the datalogger 5 V supply via a transformer/isolator. An on-board DC to DC converter supplies the negative voltage required for RS-232 signals.
SC32B Optically Isolated RS-232 Interface 4
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