EndRun Sonoma D12, User Manual

Page: 109 / 172

S o n o m a U s e r M a n u a l 92
C H A P T E R T E N
93 S o n o m a U s e r M a n u a l
O P T I O N S
PPS”, etc. This signal is specified by the customer when the order is placed, preset at the factory, and
cannot be changed. For details on signal definition see
Appendix H - Specifications
.
View the Fixed Rate Output Connector
On the front-panel display traverse to the Main Menu and then to CPU_I/O. This display lists any
connector on the CPU Module that has an optional I/O signal. Connectors are identified as A, B or C.
Select the particular connector (I/O-A, I/O-B or I/O-C) to see which signal is installed.
Or, you can use this console port command:
Command:
cpuio
Sonoma reply:
CPU I/O C - 10M PPS OUTPUT is Installed
Alarm Output
The Alarm Output provides an open-collector output that indicates when the CDMA Subsystem has
lost lock, or when serious hardware faults are detected. For a detailed description of the faults see
Ap-
pendix G - System Faults .
Care should be taken not to directly connect this open-collector output to a voltage source. A series
current-limiting resistor of at least 1K ohms in value should be used. The pull-up voltage must not
exceed 40V. The Alarm Output connector can be either a BNC or a terminal block. For more details
see
Appendix H - Specifications
.
View the Alarm Output Connector
On the front-panel display traverse to the Main Menu and then to CPU_I/O. This display lists any
connector on the CPU Module that has an optional I/O signal. Connectors are identified as A, B or C.
Select the particular connector (I/O-A, I/O-B or I/O-C) to see which signal is installed.
Or, you can use this console port command:
Command:
cpuio
Sonoma reply:
CPU I/O C - OPEN COLLECTOR ALARM OUTPUT is Installed
Direct Digital Synthesizer (DDS)
The DDS Option provides user-selectable pulse rates from 1 Hz to 10 MHz, programmable in 1 PPS
steps, including 1.544 MPPS or 2.048 MPPS. The selected pulse rate is phase locked to the system oscil-
lator and is not aligned with system time.
The DDS is a “system signal”. This means that there is one DDS signal that affects the whole system.
In other words, if your Sonoma has multiple DDS outputs and you change the pulse rate, then all DDS
outputs will be affected.
The pulse rate is 0 Hz when shipped from the factory but can be changed (see below). For details on
the DDS signal definition see Appendix H - Specifications .