Meinberg FDM511 - Manual (Page 7)

7
Analog Outputs
FDM511 provides two analog outputs for longtime-recording. These outputs have a
range of -2.5V ... +2.5V, divided in 65536 steps. Either the frequency deviation or the
time deviation can be selected for monitoring via one of these analog outputs.
Serial COM Ports
The frequency deviation monitor provides two serial RS-232 interfaces, COM0 and
COM1. Both ports are able to spread the calculated measurements of the FDM511 once
per second, the format of the string can be selected. In addition, COM0 is used for some
serial commands sent to the module, e.g. for setting a time deviation preset value.
Firmware updates are also possible using this port. The serial input of COM1 is used to
read in the time information of the preconnected reference.
EEPROM
The non-volatile EEPROM is used to store the settings of the FDM511. This ensures a
proper restart without any new configuration after the module was switched off for a
certain time. The two push bottons in the front panel and the LED display are used to set
the parameters (see "Menu SETUP").
Installation
Power Supply
FDM511 needs a single supply voltage of +5V/150mA. As soon as the power supply
and the requested input signals are applied, the module starts operation.
Input Signals
The following input signals, provided by a preconnected reference, are necessary for
operation of the frequency deviation monitor FDM511:
a) 10MHz oscillator clock, TTL level, rear edge connector pin Z12
b) pulse per second, TTL level (active-high), rear edge connector pin D6
c) time string, RS-232, rear edge connector pin B10 (RxD1)
A GPS receiver GPS170 or a DCF77 radio clock PZF511 can be used as a reference, for
example.