I am simply trying to send 156 unique numerical stimulus trigger labels from a pc running Psychopy, through a brain vision trigger box serial usb port to another pc (through actiChamp) recording eeg data in Brainvision Recorder. The labels should be read out of an excel Stim file referenced in Builder. I am not using any code components, becuase the gui should be able to handle this, and it does, up through Stim# 191, then when Psychopy sends 192 to Recorder, it shows up as 128, 193 shows up as 129, etc. Anyone recognize this problem? Thanks!

Psychopy gui settings

The TriggerTest in Recorder works fine and goes up to 255.

(aside: trigger # 0, or 256 never shows up. Does that mean that with 8 bytes I can actually only ever get 255 unique labels?).