If, for example, a GPS receiver with IRIG-B connection is available, the internal clock of the P632 can be synchronized to run on GPS time using the optional IRIG-B interface. It should be noted that the IRIG-B signal holds information on the day only (day of the current year). Using this information and the year set at the P632, the P632 calculates the current date (DD.MM.YY).

The IRIG‑B interface can be disabled or enabled using a setting parameter.

If the IRIG-B interface is enabled and receiving a signal, the P632 checks the received signal for plausibility. Implausible signals are rejected by the P632. If the P632 does not receive a correct signal in the long run, synchronization will not be ready any longer.