Chapter 9
Relay Contacts and Event Inputs
9.1 Relay Contacts – Option 93
9.1.1 Introduction
Option 93 provides a single set of SPDT relay contacts when installed the Model 1092A/B/C or
1093A/B/C. Without Option 93 installed, the relay contact connector will be visible, however no
contacts or related circuitry will be installed. To retrofit the Option 93, Out-of-Lock relay, you
must arrange to return it to the factory for installation. These Form C type contacts have a limited
lifetime of approximately 100,000 cycles. See also Section 2.3.5.
9.1.2 Relay Operation
The out-of-lock relay is in the faulted position when the clock is powered OFF (Failsafe operation)
or is not locked to the GPS. The faulted indication is as follows; ERR (Normally Closed) is shorted
to COM and OK (Normally Open) is open with respect to COM. If the clock loses synchronization
with the GPS, the out-of-lock relay will change state (is faulted) based on the “Out-of-Lock” setup.
Configure this through the front panel (see Section 7.5) or the RS-232 interface (see Section 10.2.14).
Out-of-Lock settings are (1) Unlock OFF, (2) Zero Delay Unlock, and (3) 1 to 99 Minute Delay for
unlock.
Figure 9.1: Relay Contact Connector
9.2 Event Inputs
9.2.1 Event Timing Input
When configured for event timing, the 1092A/B/C and 1093A/B/C can provide one input channel
with one microsecond resolution. This channel is primarily used for synchronization via the RS-232
port with an external computer or other type of device. It may also be used to time an external 5
V CMOS signal applied to one of the I/O connectors; see Section 5.3.4.
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