[time-nuts] Warning about "slef-powered" RS-422 to RS-232 converers

Hal Murray hmurray at megapathdsl.net
Wed May 31 01:48:11 EDT 2017

holrum at hotmail.com said:
> While playing with the RFTG-m GPSO I tried using a couple of RS-422 to
> RS-232 converters.  These converters can be externally powered or
> "self-powered" by the RS-232 signals. 

I have a SIGG CyberSerial 4S PCI card for RS-232 with a jumper to provide 5V 
or 12V to pin 9

I assume it was used to provide power to small things like USB does now.

Package says Part No: JJ-P45012

These are my opinions.  I hate spam.

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