Campbell Scientific SC32B SC32B Optically Isolated RS-232 Interface - Page 7

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. 1