What do S and T values mean in MCRSync Monitor?

S represents the host system time (the PC running MCRSync). T represents the time maintained by the Masterclock PCIe card.

• S and T update continuously.
• The difference between S and T should remain small and stable.
• Minor variation is normal due to measurement timing.

• S updates but T does not: communication or COM port issue.
• T updates but shows large drift: reference or lock issue.
• Neither updates: card not detected or driver issue.

S and T are primarily diagnostic values used to confirm communication with the PCIe card and verify that the card is actively tracking time.