Guys,

Looking for some insight.

I was doing some checkout of a device. The device output a +10/-10V RS232 signal swing from a MAX232 device.

When it was attached to a PCI serial port card, the output dropped to +2.5/-10 V. In other words, the PCI card was clamping the input positive value. It does work OK even clamped like this.

I'm guessing the internal chips are low voltage devices.

I though one of the redeeming values (for hams at least) of the +15/-15 volt RS232 spec was noise immunity. Clamping it to 2.5 Volts means considerably less noise (RFI) immunity?

True we do get along with lots of 5V TTL stuff.

73 de Brian/K3KO



-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2240 / Virus Database: 2641/5677 - Release Date: 03/15/13

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Reply via email to