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can_faq:can_faq_blowuprs232 [2018/08/21 23:08] (current)
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 +====== Can CAN blow up RS232 transceivers ======
 +
 +[[mailto:​schlegel@ixxat.de|Christian Schlegel]] wrote
 +
 +Yes it can!  Perhaps the CAN trasceiver 82C250 is used on the I/O module. This
 +transceiver is only able to sustain a voltage of -8V to +18V at CAN_H
 +and CAN_L. On a RS232 you have -12V to +12V.
 +
 +Using the CAN transceiver 82C251 gives more immunity because this
 +transceiver can sustain a voltage of -36V to +36V at CAN_H and CAN_L
 +and the price of this chip is quite the same as for the 82C250.
  

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