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BS11Troubleshooting » History » Revision 6

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dexter, 02/19/2016 10:47 PM


= Troubleshooting =

Known problems with the LMT connection

{{{
Problem:
'bs11_config' can't get a connection to the BS-11 (no 'LMT LOGON: ACK')

Solution:
The BS-11 is a little bit choosy about the RS232 levels, I discovered some problems
with my Dell PC (could receive anything, but no tx). Just switch to an el-cheapo USB
to Serial adapter, this should solve the problem.

Some background notes:
We measured the RS232 levels and we found out that the level of our RS232<==>USB Adaptor
is much lower (about /-6 Volts) than normaly expected (/-12V). The BS11 transmits at a
semeliar level (about 8 Volts). This may be an explaination why the BS11 does not like
the normal (+/-12V) levels. See attached files (Lmt_*) for oscilloscope screenshots.

Maybe a simple voltage-devider at TX on the PC side will also solve the problem...

}}}

Files (5)
Lmt_bts-rx.jpg View Lmt_bts-rx.jpg 307 KB dexter, 08/01/2009 08:54 PM
Lmt_bts-rx.2.jpg View Lmt_bts-rx.2.jpg 307 KB dexter, 08/01/2009 08:55 PM
Lmt_btx_tx_does_not_work.jpg View Lmt_btx_tx_does_not_work.jpg 399 KB dexter, 08/01/2009 08:56 PM
Lmt_bts-tx.jpg View Lmt_bts-tx.jpg 341 KB dexter, 08/01/2009 09:01 PM
jughanns_E1_power_select.jpg View jughanns_E1_power_select.jpg 322 KB dexter, 10/21/2009 04:33 PM

Updated by dexter about 8 years ago · 6 revisions

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