[time-nuts] Serial-Ethernet

Joseph Gray jgray at zianet.com
Thu Feb 25 09:20:17 EST 2016


I forgot one thing I was going to say about your comment of not
trusting CN network products. I fully understand these concerns. In
fact, any networked device (regardless of manufacturer) that I have
that does not require internet access has its "gateway" set to its own
IP address. This may not be foolproof, but certainly makes it harder
for malicious hardware to talk to the outside world. If I wanted to be
extra cautious/paranoid, I could also add firewall rules to block
devices by MAC address.

Joe Gray

On Thu, Feb 25, 2016 at 1:38 AM, Tom Van Baak <tvb at leapsecond.com> wrote:
> Joe,
> Thanks for that posting. I've also used a lot of LAN or USB to RS422 converters, as well as RS232/422 adapters on my Z3801A.
> Before you commit to Amazon, note there are many Ethernet/RS422 offerings on eBay.
> Just do an eBay search for: RS422 ethernet
> Or to uncover even more listings, in the search box, type:
>     RS422 (Ethernet,LAN,TCP/IP,Network)
> I see there's some local ones (USA) for less than your Amazon find:
> http://www.ebay.com/itm/201326888567
> http://www.ebay.com/itm/181841884873
> There are also inexpensive bare-board versions like:
> http://www.ebay.com/itm/131700539876
> And, if you have a couple of 422 devices, consider the economics of a 4-port unit like:
> http://www.ebay.com/itm/301881123530
> I have no affiliation with any seller, nor have I tried these specific items. But they are inexpensive and look worthwhile. OTOH, I'm nervous about any networking product made in CN even if its web interface says "IOT Experts" and "Be Honest, Do Best!"...
> /tvb
> ----- Original Message -----
> From: "Joseph Gray" <jgray at zianet.com>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Wednesday, February 24, 2016 9:01 PM
> Subject: [time-nuts] Serial-Ethernet
>>I just thought I'd report about a serial to Ethernet interface I just
>> bought. I got one of these:
>> http://www.amazon.com/gp/product/B00ATV2DX2
>> At the moment it is hooked up to my Z3801A and I am using Z38XX.exe
>> from across the network. Using the included software and driver, I
>> have the RS232 port mapped to COM 7 on my local PC.
>> I bought this particular model not only because of price, but because
>> it also does RS422. I will test this capability with my Lucent GPSDO
>> with the RS422 ports. If it works, I'll order another one just for the
>> Lucent.
>> Joe Gray
>> W5JG
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