Thanks Ary, lemme try those.
[2019-08-28 20:27:03] RRRRYYYYYYYYYYYYYYY
[2019-08-28 20:27:05] S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9
[2019-08-28 20:27:11] 4444444444
[2019-08-28 20:27:12] 829 829 829 000 829 829 829 000 829 829 829 000
[2019-08-28 20:27:16] S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9S9
[2019-08-28 20:27:23] 4444444444
[2019-08-28 20:27:25] Message text:
[2019-08-28 20:27:27] 04631 00001 00000
[2019-08-28 20:27:30] End of message
[2019-08-28 20:27:30]
Yep Bd was the key. K500 allows for direct Bd entry, WCODE doesn't, have to set the character duration to 100ms, then it got the correct decode. Centurion doesn't seem to have a means to set Bd. Sorry for the excitement, first time bothering with xpa.