26 Aug
2011
26 Aug
'11
7:09 p.m.
On 27 Aug 2011 at 1:46, Pete Turnbull wrote:
Never seen a USB-20mA (for example). Everything seems
to be based on
voltage thresholds these days...
Well, USB-to-RS422 or RS485 adapters certainly exist. I suspect that
the reason that USB-to-20ma adapters are thin on the ground is that
most prefer to go USB-to-RS232-to-20ma, given power requirements and
the availability of RS232-to-20ma hardware.
--Chuck