[time-nuts] Serial-Ethernet

Bob Camp kb8tq at n1k.org
Wed Mar 16 21:39:33 EDT 2016


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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