[WT-support] Access to antenna controller from LUA-script

[Bob Wilson, N6TV]

If you install Portmon
<https://technet.microsoft.com/en-us/sysinternals/portmon.aspx> you can
trace all bytes being written to the serial port.  Perhaps it requires
DTR=ON RTS=ON instead of OFF or a different baud rate that what I've hard
coded in the MODE command.  Send me your script as an attachment and a PDF
file documenting the required command stream for your antenna switch
device, and I'll take a look.

I wrote bytes to an FTDI serial port using my script, and it seemed to work
fine, the trace showed the bytes being written OK, encluding SOH and ETX.

73,
Bob, N6TV

On Thu, Dec 15, 2016 at 4:15 PM, <gt-i at gmx.net> wrote:

> Bob,
> good hint. However, after playing quite a while, I'm pretty sure that
> io.write does not send anything out, instead it seems to write it to an
> internal buffer which I can check using :read(1). I tried :flush() and
> :setvbf("no") which did not cure this. I also played with variations of
> io.open(.."w", "r+") etc. I tested on a phyiscal COM-port with an Echo-plug
> (RX/TX, all Modemlines connected to each other), to a virtual one using
> com0com etc - no change.
> Any other idea?
> Tnx,
>
> Gernot DF5RF
>
>
> Am 14.12.2016 um 23:43 schrieb Bob Wilson, N6TV:
>
>> Win-Test includes the Lua version 5.1 interpreter, which supports decimal
>> escape sequences in string literals.  (Only Lua 5.2 and later supports hex
>> escape sequences.)
>>
>> So to write the string TEST, preceded by SOH (1 decimal) and terminated
>> by ETX (3 decimal), you may simply code:
>>
>> device:write("\1TEST\3")
>>
>> You may specify up to three decimal digits after the backslash, \0 to
>> \255 (for 0x00 to 0xFF).  If you need a CR or LF, you may use \r or \n .
>>
>> You may find this ASCII to decimal lookup table helpful:
>>
>>     https://courses.engr.illinois.edu/ece390/books/labmanual/asc
>> ii-code-table.html
>>     <https://courses.engr.illinois.edu/ece390/books/labmanual/
>> ascii-code-table.html>
>>
>>
>> Attached is a much improved serial port script that runs the Windows MODE
>> command only once, instead of every time you run the script.  It also
>> accepts the COM port number 1-99 as an script argument so that you don't
>> have to answer a prompt for COM port number the first time you run it.
>>
>> Win-Test reflector subscribers may not see the attachment, but there will
>> be a link to a "non-text attachment" in the reflector archives for this
>> month <http://lists.f5mzn.org/pipermail/support/2016-December/>, at the
>> bottom of this post, where you should be able to view and download it using
>> your browser.  During download, be sure to rename the file from
>> *attachment.obj* to *COM_Test.wts*.
>>
>> 73,
>> Bob, N6TV
>>
>> On Wed, Dec 14, 2016 at 1:09 PM, <gt-i at gmx.net <mailto:gt-i at gmx.net>>
>> wrote:
>>
>>     Bob,
>>
>>     thanks for sharing, this is what I was looking for. However, it
>>     does not seem to work with the antswitch and since it is a
>>     USB-VCOM port I cannot check externally. The protocol requires
>>     special bytes like SOH (0x01) and ETX (0x03) - maybe those will be
>>     filtered out somehow? Any idea how to make sure these characters
>>     will be sent out unchanged?
>>
>>     73
>>
>>     Gernot, DF5RF
>>
>>
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