[time-nuts] Serial-Ethernet

Joseph Gray jgray at zianet.com
Wed Mar 16 23:00:33 EDT 2016


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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