[time-nuts] Serial-Ethernet

[Bob Camp]

Hi

The graph is a nice way to see if there are any strange humps in the dac info when 
it is translated into frequency. We are used to looking at ADEV plots so it is not a
bad way to present the data. If you have a unit that goes crazy every few hours, it
will give you a bump on the plot.

Bob

> On Mar 16, 2016, at 11:00 PM, Joseph Gray <jgray at zianet.com> wrote:
> 
> Yes, I should have realized that it wasn't comparing the GPSDO against
> anything. So, what is the point of this graph in Z38xx?
> 
> On Wed, Mar 16, 2016 at 7:39 PM, Bob Camp <kb8tq at n1k.org> wrote:
>> Hi
>> 
>> Be *very* careful looking at plots based on translated DAC readings. You don’t really have all you need to come up with proper numbers. A simple scale error can make things look much better or much worse than they actually are.
>> 
>> Bob
>> 
>>> On Mar 16, 2016, at 7:54 PM, Joseph Gray <jgray at zianet.com> wrote:
>>> 
>>> Well, the 4-port serial to Ethernet converter has been running for 22
>>> hours, collecting data from two GPSDO's and it hasn't missed a beat.
>>> 
>>> Although I have had the Lucent unit running for several months, this
>>> is the first time I have hooked up to the RS-422 port and taken data
>>> from it. From the look of this graph, it seems to be performing quite
>>> well.
>>> 
>>> https://dl.dropboxusercontent.com/u/19599147/Lucent%20Adev.png
>>> 
>>> Joe Gray
>>> W5JG
>>> 
>>> 
>>> On Tue, Mar 15, 2016 at 7:05 PM, Joseph Gray <jgray at zianet.com> wrote:
>>>> On Thu, Feb 25, 2016 at 1:38 AM, Tom Van Baak <tvb at leapsecond.com> wrote:
>>>>> 
>>>>> And, if you have a couple of 422 devices, consider the economics of a 4-port unit like:
>>>>> 
>>>>> http://www.ebay.com/itm/301881123530
>>>> 
>>>> As promised, I am reporting on the USR-N540, 4-serial-port to Ethernet
>>>> box that Tom linked to. I had originally found it for less, but after
>>>> ordering, the seller emailed back to tell me he had no more at that
>>>> price. In any event, after about three weeks from China, my unit
>>>> arrived today. I haven't had any long term experience with this thing,
>>>> so hopefully it will continue to work.
>>>> 
>>>> It was very well packed in a small box with hard foam. Included are
>>>> the converter box, wall wart (switcher), 2-pin screw terminal power
>>>> adapter, serial cable, Ethernet cable and four DE-9 to 4-pin screw
>>>> terminal adapters (for RS-422, RS-485). No documentation and no
>>>> software. The box is made from steel and seems substantial. The power
>>>> input is labeled "DC: 9-24V".
>>>> 
>>>> I downloaded manuals and software from here:
>>>> http://www.usriot.com/p/4-serial-port-to-ethernet-converter/
>>>> 
>>>> One annoying thing is that the box is setup with a static IP, instead
>>>> of DHCP. The default IP of 192.168.0.7 is printed on the bottom, as
>>>> well as in the manual. The MAC address is not printed on the bottom.
>>>> The manual also lists the default login credentials.
>>>> 
>>>> I initially only configured Port 1 in the web interface, to test with
>>>> my HP Z3801A (RS-232, 19200, 7, odd, 1). I then installed the Virtual
>>>> Serial Port software. This seems to be a licensed version of the
>>>> Eltima software http://www.eltima.com/products/vspdxp/. Or, perhaps
>>>> the Eltimat software is licensed from USR IOT?
>>>> 
>>>> In the software, you can click on the "Smart VCOM" button and all four
>>>> ports will be assigned for you, using the first available port numbers
>>>> on your PC. I wanted a sequential range of 10-13, so I configured each
>>>> port individually, using the "Add COM" button. The interface box uses
>>>> TCP/IP ports of 23, 26, 29 and 32 by default, but these can be changed
>>>> in the web interface. Interestingly, the MAC address can also be
>>>> changed.
>>>> 
>>>> The web interface is very well laid out and logical, as is the Virtual
>>>> Serial Port software. I have been connected to the Z3801A for almost
>>>> half an hour and things seem to be working just fine. I'll update if I
>>>> encounter any problems later. I will have to try the RS-422 with my
>>>> Lucent GPSDO.
>>>> 
>>>> All in all, I am pleased with this converter box. At $20 per port, it
>>>> seems like a good deal for a new item. I know that others are using
>>>> surplus terminal servers that they bought for less.
>>>> 
>>>> Approximate dimensions: 8.5" (including mounting ears) x 4.75" x 1.2"
>>>> 
>>>> Joe Gray
>>>> W5JG
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