Campbell SC32B, Instruction Manual

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1
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. Optical
isolation separates the SC32B into a datalogger section and an RS-232
section. Signals entering from either side are electrically independent,
protecting against ground loops, normal static discharge, and noise.
3. Passing data when modem enable pin 5 is high and SDE/printer enable pin 6
is low (normal telecommunications mode).
The SC32B blocks data sent out the datalogger CS I/O port when the SDE/print
enable pin 6 is high. This prevents data sent to an SDE device (for example,
storage module) or printer output from being sent out the RS-232 port. The
SC32B cannot be configured to pass Instruction 96 serial printer or computer data.
Contact Campbell Scientific if this capability is required.