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Summary of Contents for Campbell SC32A
- Page 1 SC32A Optically Isolated RS232 Interface Reference Manual Issued 5.5.94 © Copyright 1987 Campbell Scientific Inc. Copied under licence by Campbell Scientific Ltd.
- Page 3 Note that goods sent air freight are subject to Customs clearance fees which Campbell Scientific will charge to customers. In many cases, these charges are greater than the cost of the repair. Campbell Scientific Ltd,...
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Page 5: Table Of Contents
3. Connector Descriptions..........1 3.1 25-Pin......................1 3.2 9-Pin......................2 4. Operation ..............2 5. Application ..............2 5.1 SC32A with 21X and CR7 Dataloggers............3 5.2 SC32A with CR10 Datalogger..............3 5.3 Special Cases ....................4 5.3.1 Null Modem ..................4 5.3.2 External Power Supply..............5 Figures 1. -
Page 7: Function
I/O port of a Campbell Scientific datalogger. The SC12 cable supplied is used to connect the datalogger to the 9-pin port of the SC32A. Connection to the serial port of a PC is made with an RS232 cable such as the Campbell Scientific SC25 or SC25AT. -
Page 8: 9-Pin
DTR (POWER) 4. Operation Power for the datalogger section of the SC32A comes from the 5V supply on pin 1 of the datalogger I/O port. Communication logic levels to and from the data- logger are referenced to this voltage, ranging from 0 to slightly less than 5V. -
Page 9: Sc32A With 21X And Cr7 Dataloggers
There are three cases were the SC32A could be used with this category of data- loggers: Case 1. An SC32A interfaces a terminal/computer to the datalogger and no peripherals enabled by pin 6 are connected. -
Page 10: Special Cases
NOTE manual. In most cases, if the SC32A is used between the CR10 and some peripheral (e.g. a PC), and addressable peripherals are also present (e.g. a Storage Module), the jumper should be in place. This will block addressing information from reaching the SC32A interfaced peripheral. -
Page 11: External Power Supply
1. The input logic levels required by the Data Receive line of the RS232 device exceed the output level of the RTS and DTR lines. 2. The RTS and DTR lines which power the SC32A are absent from the cable going to the RS232 device. -
Page 12: Schematic
SC32A Optically Isolated RS232 Interface Figure 2 Schematic...
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