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