On 2/24/22 11:31 PM, Larry McDavid wrote:
I give up! Where is this $5 USB-to-RS422 Adapter to be found?
Amazon has such a DTECH adapter for $22.
Indeed the price has gone up substantially - $15
https://www.amazon.com/DSD-TECH-SH-U10-Converter-Compatible/dp/B078X5H8H7
I am using a RS422-to-RS232 adapter and it has been totally reliable
for many years. I am not trying to use the pps output via the serial
link so any delay in the USB adapter would be irrelevant.
Is anyone successfully using a USB-to-RS422 adapter to communicate
with a HP Z3801A? How does the Z3801A software need to be configured
for USB or does the USB adapter simulate a RS232 port?
The one I have looks just like a serial port (i.e. it shows up as
/dev/cu.SLAB_USBtoUART on my mac and is usable with pyserial ) . I
changed the jumpers on my Z3801 to RS232 a long time ago, so I don't
know if it would work, but I suspect it would - they're not doing any
exotic protocols - it's just serial data.
And I've never depended on the timing of the messages - so the USB
timing isn't important.
A lot was left unsaid in that simple statement below...
Larry
On 2/24/2022 8:53 PM, Lux, Jim wrote:
On 2/24/22 7:25 PM, ed breya wrote:
Paul and Hal, I think there may be some confusion here. I modified
the Z3801A to RS-232 way back when I first got it. My recent post
was just discussing some of what's in this demo/testing unit thing.
It's just a translator for TTL/RS-232 for when the GPS RX board (TTL
serial) is used by itself, hooked to a PC (RS-232), so the WinOncore
SW can talk to it. When the RX board is inside the Z3801A, it's
controlled in that environment.
These days, since PCs don't have serial ports, you can buy a RS422
USB adapter for $5. If I were doing it now, I wouldn't bother
reconfiguring.
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