IO821 — Precision timing module with IRIG and 1PPS
interfaces and optional GNSS
The IO821 I/O module - with an optional GNSS (GPS/GLONASS) receiver – provides
precision timing and synchronization for real-time applications and includes both
input and output interfaces to IRIG and 1PPS. The precision timing reference uses an
onboard oscillator with a 5 ns resolution that is phase-locked to an external
timing reference input.
This I/O module supports multiple timing inputs and, when the current timing input
is lost, it switches automatically to the next lower-priority input. Furthermore,
the crystal oscillator provides uninterrupted precision timing even when all
external sources become unavailable (referred to as holdover). For applications
where accuracy during holdover is essential, an oven-controlled crystal oscillator
(OCXO) is optionally available.
The IO821 I/O module can be used to generate an interrupt which triggers the
Simulink model execution at very precise intervals. In addition, it can supply
precision timing references to synchronize external hardware on the External HW Sync