CanFaqBlowUpRS

Christian Schlegel schlegel@ixxat.de :

Yes! 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.