Strange problem with motor record and MAXv, Movement only possible in one direction

["Heinz Junkes \(FHI\) via Tech-talk" <tech-talk at aps.anl.gov>]

Hi,
We have the rare phenomenon that we can 'suddenly' only move a stepper motor on a MAXv card in one direction,
but no longer backwards.
We see  in the MSTA field (bit 13, value 8192) "Communication Error”.

In this output we want to go back to 120463.0 comming from 120473.0. This does not work. Going to higher values works out.
Any Idea? Is there a soft-reset for the communication error?

{ "secs": 1747817918, "val": 120163.698, "nanos": 788056065, "severity":0, "status":0 },
{ "secs": 1747817918, "val": 120264.001, "nanos": 841219968, "severity":0, "status":0 },
{ "secs": 1747817921, "val": 120164.001, "nanos": 453155, "severity":0, "status":0 },
{ "secs": 1747817921, "val": 120264.001, "nanos": 66337867, "severity":0, "status":0 },
{ "secs": 1747817925, "val": 120164.001, "nanos": 746793414, "severity":0, "status":0 },
{ "secs": 1747817925, "val": 120264.001, "nanos": 800302471, "severity":0, "status":0, "fields": { "DIFF": "0.0","MSTA": "8194.0","DVAL": "120264.001"} },
{ "secs": 1747817928, "val": 120164.001, "nanos": 127974122, "severity":0, "status":0 },
{ "secs": 1747817928, "val": 120264.001, "nanos": 181410278, "severity":0, "status":0 },
{ "secs": 1747817930, "val": 120164.001, "nanos": 480282362, "severity":0, "status":0 },
{ "secs": 1747817930, "val": 120264.001, "nanos": 533335203, "severity":0, "status":0 },
{ "secs": 1747817935, "val": 120364.001, "nanos": 637892081, "severity":0, "status":0, "fields": { "DRBV": "120363.754","DIFF": "0.2470000000030268","RBV": "120363.754","MSTA": "3.0","DVAL": "120364.001"} },
{ "secs": 1747817943, "val": 120264.001, "nanos": 637148825, "severity":0, "status":0 },
{ "secs": 1747817943, "val": 120363.754, "nanos": 690558011, "severity":0, "status":0, "fields": { "DIFF": "0.0","MSTA": "8194.0","DVAL": "120363.754"} },
{ "secs": 1747817946, "val": 120263.754, "nanos": 833605711, "severity":0, "status":0 },
{ "secs": 1747817946, "val": 120363.754, "nanos": 891511240, "severity":0, "status":0 },
{ "secs": 1747817950, "val": 120263.754, "nanos": 945410320, "severity":0, "status":0 },
{ "secs": 1747817950, "val": 120363.754, "nanos": 999627237, "severity":0, "status":0, "fields": { "DIFF": "0.0","DVAL": "120363.754"} },
{ "secs": 1747817989, "val": 119363.754, "nanos": 881542545, "severity":0, "status":0 },
{ "secs": 1747817989, "val": 120363.754, "nanos": 935199865, "severity":0, "status":0, "fields": { "DIFF": "0.0","DVAL": "120363.754"} },
{ "secs": 1747817998, "val": 120263.754, "nanos": 31770575, "severity":0, "status":0 },
{ "secs": 1747817998, "val": 120363.754, "nanos": 84994118, "severity":0, "status":0, "fields": { "DIFF": "0.0","DVAL": "120363.754"} },
{ "secs": 1747818011, "val": 120263.754, "nanos": 10922202, "severity":0, "status":0 },
{ "secs": 1747818011, "val": 120363.754, "nanos": 64197136, "severity":0, "status":0, "fields": { "DIFF": "0.0","DVAL": "120363.754"} },
{ "secs": 1747818017, "val": 120463.754, "nanos": 19173109, "severity":0, "status":0 },
{ "secs": 1747818020, "val": 120363.754, "nanos": 4583098, "severity":0, "status":0 },
{ "secs": 1747818020, "val": 120463.50700000001, "nanos": 69490786, "severity":0, "status":0, "fields": { "DRBV": "120463.50700000001","DIFF": "0.0","RBV": "120463.50700000001","MSTA": "8194.0","DVAL": "120463.50700000001"} },
{ "secs": 1747821309, "val": 120473.50700000001, "nanos": 986685558, "severity":0, "status":0, "fields": { "DRBV": "120473.239","DIFF": "0.26800000001094304","RBV": "120473.239","MSTA": "3.0","DVAL": "120473.50700000001"} },
{ "secs": 1747821317, "val": 120463.50700000001, "nanos": 60154997, "severity":0, "status":0 },
{ "secs": 1747821317, "val": 120473.239, "nanos": 114167381, "severity":0, "status":0, "fields": { "DIFF": "0.0","MSTA": "8194.0","DVAL": "120473.239"} },
{ "secs": 1747821397, "val": 120463.0, "nanos": 371932391, "severity":0, "status":0 },
{ "secs": 1747821397, "val": 120473.239, "nanos": 425544508, "severity":0, "status":0, "fields": { "DIFF": "0.0","DVAL": "120473.239"} },
{ "secs": 1747821939, "val": 120463.0, "nanos": 464209117, "severity":0, "status":0, "fields": { "cnxlostepsecs": "1747821780","cnxregainedepsecs": "1747821939"} },
{ "secs": 1747821939, "val": 120473.239, "nanos": 517810508, "severity":0, "status":0 },

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Fritz-Haber-Institut    | Phone:         (+49 30) 8413-4270
Heinz Junkes             | Fax (G3+G4):   (+49 30) 8413-5900
Faradayweg 4-6        | VC: https://zoom.fhi.berlin/junkes
D - 14195 Berlin        | E-Mail:        junkes at fhi-berlin.mpg.de
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“Sorry I’m a bit late, had a terrible time…
All sort of things cropping up at the last moment. Uh, how are we for time?”
—Zarquon's address to Milliways
Danke Heinz

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