EndRun Meridian II, Руководство пользователя, Страница: 125 / 240

M e r i d i a n I I U s e r M a n u a l 104
C H A P T E R T E N
105 M e r i d i a n I I U s e r M a n u a l
R E A R - P A N E L I / O
View the 10 MPPS 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
MeridianII reply:
CPU I/O C - 10 MPPS OUTPUT is Installed
Alarm Output Option
The Alarm Output provides an open-collector output that indicates when the GPS 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 K - Specifications, Optional Alarm Output on CPU Module .
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
MeridianII reply:
CPU I/O C - OPEN COLLECTOR ALARM OUTPUT is Installed
Serial Time Output Option
This option is provided on an RS-232 (or RS-422) serial port labeled “Serial Time”. It is an output
that provides a once-per-second sequence of ASCII characters indicating the current time. The “on-
time” character starts transmitting within the first 20 microseconds of each second. The output starts
automatically on power-up. See Appendix K - Specifications, Optional Serial Time Output on CPU
Module for details.
The Serial Time is a “system signal”. This means that there is one Serial Time signal that affects the
whole system. In other words, if your Meridian II has multiple Serial Time outputs, and you change
the settings, then all Serial Time outputs will be affected.
There are several different formats for this ASCII string. The format, baud rate and parity can all be
changed via the front-panel keypad or via the console port. Baud rate selections are 57600, 19200,
9600, and 4800. Parity selections are odd, even, and none. Format selections are Sysplex, Truetime,
EndRun, EndRunX, NENA and NMEA.