We are designing a circuit for Connecting our PC to an RFID reader via RS232 Interface. On searching for best installation practices online I found out that a surge protector is recommended as shown here --> http://www.alldatasheet.com/view.jsp?Searchword=RS485NEESA
Now as we are building the circuit ground up so is there a way I can avoid using expensive external RS232 surge protectors and just use better design? The solutions that we have thought of range from:
1. Use MAX232E(E is for ESD protection)--> www.ti.com/product/MAX232E
2. Use Max250 with optocouplers--> www.akizukidenshi.com/download/ds/maxim/max250_251.pdf
3. Use TVS diodes with PTC fuses. Based on inspiration(and assumptions) from this circuit --> http://www.kynix.com/Detail/186258/RS485NEESA.html. Though We are still not sure which ones to use.
4. User MAX13223E as suggested by someone on this link --> electronics.stackexchange.com/questions/9855/is-there-a-way-to-protect-rs-232-transceiver-ic-from-static-death
Any suggestions of which is a good design or are we over thinking? We need a baud rate of 115Kb/s
Added 9 years ago.