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Why is isolation needed for my RS232 connection?

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The NMEA 0183 specification, from version 2 and higher, requires devices to be isolated on their input lines. The OPTO-4 allows an RS232 input connection to meet these NMEA 0183 Listener specifications.

Without this protection you risk ground loop damage to the RS232 device and/or the NMEA Talker. This might result in the need to replace expensive equipment.

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