Chapter 9
Relay Contacts and Event Inputs
9.1
Introduction to Relay Operation
The Model 1094B has one set of mechanical, Form C relay contacts that may be configured to
switch with a predetermined fault, an out-of-lock condition, or driven by the programmable pulse
feature. When configuring the 1094B relay contacts for programmable pulse, take care to compare
the pulse rate with the life expectancy of the contacts. See Programmable Pulse in the Index for
details on configuring the Model 1094B for programmable pulse.
9.2
Configuring
To configure these contacts, you will need to remove the cover to the clock chassis locate jumper
JMP8. It is located just slightly left of center. See Section 5.3 for more information on configuring
these jumpers.
9.3
Fault Conditions
If the FAULT LED illuminates, the clock status message will change to read:
CLOCK STATUS
ERROR
{
message
}
Where
message
= one of the error messages listed below.
1. Receiver Failure (no communication between clock and GPS Receiver)
2. Antenna Short (antenna voltage is very low; it is normally 5 Vdc)
3. Antenna Open (antenna not drawing any current)
9.4
Viewing the Fault Status
If the Model 1094B executes a fault due to one of the conditions listed above, it will display the
Clock Status fault condition on the LCD and illuminate the Fault LED. The fault status will also
be available using the Event Status commands through either of the serial communications ports.
See Section 10.3.4, Serial Communication and Command Set, for details on using the serial port to
configure and access the event information.
