In Menace's Monitor FAQ he has the following listed as common readings on a STR30123 with the black lead of a DMM connected to the first pin...
STR30130
1 to 2,3,4,5   open
2 to 1,2,3,5   open
2 to 4            1667
3 to 1,5         open
3 to 2              587
3 to 4            595
4 to 1,3,5      open
4 to 2            1065
5 to all           open
Does anyone have the readings for an STR3123 or could take them for me and post them?