Meinberg FDM509 - Manual (Page 8)

8
Configuration
Configuration occurs via the on board DIL switch. To synchronize the FDM509 it is
necessary to set baudrate and framing of the connected reference time string to 19200
baud, 8N1. The module starts sending the measure string as soon as all necessary
signals are applied and the Fail LED is switched off.
Power Line Frequency
FDM509 is designed to monitor the frequency in 50Hz mains as well as in 60Hz
mains. The corresponding configuration is set via DIL-SW1:
DIL-SW1 (nominal mains frequency) OFF: 50Hz ON: 60Hz
Average and Serial Output String
The period length of the mains frequency is measured and then read out by the micro
controller of the FDM509. The values are averaged over a period of one second or one
minute and then the frequency is calculated with this average value. The serial string is
sent once per second or once per minute, too, corresponding to the period of average.
Configuration occurs via DIL-SW2:
DIL-SW2 (Average) OFF: once per second ON: once per minute
Initialize Power Line Time
The PL time must be initialized at the beginning of the measurement, so it either can
be set with the REF time or it starts with 00:00:00. In the first case the REF time is
read in via COM1 (19200 baud, 8N1) of the FDM509, PL time and REF time are
synchrounous at the beginning of the measurement. Because only the difference
between the REF time and the drifting PL time is actually relevant, reading in the REF
time string and connecting the serial ports may be omited. In this case both times start
with 00:00:00 after reset.
DIL-SW3 (initialialize PL time) OFF: time string ON: 00:00:00