![]() ![]() Although the original specification was intended for modems, subsequent RS-232 transceivers support general-purpose serial interfaces at data rates up to 1 Mbps. It looks like I have plan for a 15kHz cut-off frequency. Isolated RS-232 is a serial communication standard defined by TIA/EIA-232-F that conveys data over a simple unterminated, multiconductor cable. What do you use? How does this value affect the pull up value that I use above? I assume more current through the LED means more current throught the resistor? Also, do you compensate for variations in the DCP010505BP-U supply voltage? How much current do I want to drive? It looks like it could range anywhere from 1ma to 20ma. The PC824 has internal LEDs which need current limiting resistors. How do I calculate the size of the pull-up resistor? The PC824 will ground it's input through the opto-transistor when I energize the diode. I assume since you're driving an RS232 converter which is in turn pumping charge to a voltage that isn't specifically specified, then that's OK for you? A five volt input will typically vary by a volt, and may vary by a volt & a half? It looks like the voltage that comes out on the other side might not be exactly what went in.
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