[time-nuts] Rapco 1804M - serial problems?

Ziggy ziggy9 at pumpkinbrook.com
Tue Oct 18 17:10:08 EDT 2011

Actually no, it doesn't have to be the software. In my day job, I work for a company that makes terminal servers (networked serial concentrators) and have seen many times where USB/serial converters do not behave properly. I would bet that choosing a different USB/serial dongle would fix the problem. Generally speaking it seems the FTDI based units are the most dependable, but implementations vary.



On Oct 18, 2011, at 1:56 PM, David J Taylor wrote:

The short version: it's now OK!

The long version: I dug out the old terminal, found it had no mains plug, added that, and noted it was video out.  Dug out an old TV, found the remote control had corroded batteries (how often have I warned people about that!) had to dig those out and find a couple of fresh AAAs so that I could switch the TV to video input, and eventually got the terminal working.  Although the terminal didn't respond to the line feed characters, it did have a "display control characters" mode, and that showed that the data stream was OK.

Went back to the PC and noted that I had a very simple terminal emulation program supplied with one of the Delphi components I use (TComPort). Compiled that, and it displayed the data perfectly.  The program is supposed to emulate VT100, and that's what I had been using on the other programs (HyperTerminal and TeraTerm Pro).  Same serial settings, of course.  Why those others don't work, and this very simple emulator does, is a mystery which will have to wait for another day

It has to be the software, doesn't it?  Too fancy a terminal emulation? Port settings incorrect (but not on two programs, surely).  Answers on a five-pound note, please!

Anyone with an 1804 care to try it with TeraTerm Pro or HyperTerminal? And a Sitecom USB hub/serial/parallel box.

Half a day "wasted", but at least with a positive result.  I've let the eBay seller know.  My thanks to all here who tried to help.

SatSignal software - quality software written to your requirements
Web:  http://www.satsignal.eu
Email:  david-taylor at blueyonder.co.uk 

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