GPS Grandmaster Clock
40
RT430-TM-EN-5
2.15 Dry-contact relay (L
OCKED
)
RT430 has 1 dry-contact used for remotely signaling the synchronism state of the unity, shown in
Length of cables connected to these terminals should not exceed 5m (16ft). See
Chapter 1
for information on
switching capacity limitations.
Figure 20: Dry-contact relay locked
As the unit is powered up, the dry-contact L
OCKED
is normally closed. Synchronism information from at least
4 GPS satellites is required for the unit to enter the locked state. In case the unit loses GPS satellite
reference, the dry-contact closes signaling synchronism loss.
2.16 Event input
RT430 has 1 input to signal TTL-Level external events, shown in
Figure 21: Event input
This input can be used to verify the PTP signal quality when RT430 is used as slave (PTP signal receiver
from external source via network). To use the event input to verify the signal quality, a synchronism output of
an external source connected to the event input should be used, as shown in
. The electrical output
of the synchronism source should be configured to send pulses in a time frequency and an event will be
registered in a log file containing the pulse timestamp for each received pulse. The input accuracy is in the
magnitude of ns.
