Conv TTL RS485 - Testing issueshttps://ohwr.org/project/conv-ttl-rs485-tst/issues2019-02-12T11:36:37Zhttps://ohwr.org/project/conv-ttl-rs485-tst/issues/1[doc] Update link in setup guide if changes are made to the PTS2019-02-12T11:36:37ZTheodor-Adrian Stana[doc] Update link in setup guide if changes are made to the PTSShould changes ever be made to the PTS scripts, a new tarball would
probably be uploaded in the files section of this project.
Please remember to also update the link to this tarball in **Section 5,
step 2** of the [PTS setup
guide](https://www.ohwr.org/3780).https://ohwr.org/project/conv-ttl-rs485-tst/issues/2Tester card redesign2019-02-12T11:36:37ZTheodor-Adrian StanaTester card redesignThe tester card that plugs into the RTM using Lemo 0S patch-panel
connectors and is usable for both the FM and RTM tests has a design flaw
in it. This flaw is that the patch-panel 0S connectors don't have the
right footprint on the PCB and therefore they can not be plugged into
the PCB.
Instead, in the first version of these PCBs, the connections will be
done "manually" using wires to connect to the holes in the PCB.
Should this pose an issue later on, the card can be redesigned. The
correct footprint **already exists** in the Altium project component
library, however the PCB needs updating and redesign to fit these new
connectors.
When this redesign is to be done, the Lemo 00 connectors should also be
replaced, otherwise they may get in the way of the gaskets of the Lemo
0S connectors, when these are placed on the support board.
To summarize, the following changes should be done if this issue will be
considered later:
- update the PCB with the new Lemo 0S connector footprints (you can do
**right-click \> Update PCB With All** in the Altium LibPkg project
- under the **PCB Library** pane)
- redo the connections around the Lemo 0S
- reposition the Lemo 00 connectors away from the Lemo 0S (see already
produced boards for why this needs doing)https://ohwr.org/project/conv-ttl-rs485-tst/issues/3Tester card triggers pulses on input even when not enabled2019-02-12T11:36:37ZTheodor-Adrian StanaTester card triggers pulses on input even when not enabledThis issue concerns tester cards that are connected directly on the RTM,
powered and enabled by Lemo cables from the FM, and are used for both FM
and RTM tests.
With the tester card plugged in and powered, but without the select
lines connected, therefore a wrong connection, the right number of
pulses may still be triggered on the inputs, possibly due to crosstalk.
All in all, this yields that the test passes even though it shouldn't.
While this is not a hugely major issue, in that the pulse tester works
with a *proper* connection (tester card is properly plugged in and the
cable connections to the tester are made), the fact that the test passes
when in fact it shouldn't is still an issue. **More tests should be
performed, possibly in a proper production environment, and if this is
actually an issue, it should then be investigated and solved.**
It should be stressed that the card works properly when it is properly
plugged in and the cable connections from the FM are made, thus the "not
a major issue" part above.