RS 232 Level Shifter Board
We purchased this board from SparkFun. It converts standard UART signals (either 0-3.3V or 0-5V) to voltage levels compliant with the RS232 standard voltage levels, and inverts the signal (also necessary for RS232 complaince). It is not as robust as, say, a MAX 232 converter (the negative voltage just barely reaches -3V) but it was effective in our relatively low-speed application (9600 baud).
The specific board that we used is red. We also routed the +24V for the RFID reader through this board and the DB9 connector. Below is a schematic for the Level Shifter Board.
shifter_smd_v13.pdf | |
File Size: | 12 kb |
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