Meinberg FDM511 - Manual (Page 13)

13
Menu Error Bits
FDM511 recognizes fail and overflow events and sets or clears eight error bits
accordingly. These bits are shown in this menu. Reading this bits, the user is able to
understand why the "Fail"-LED or the "Overflow"-LED is switched on.
Each error bit represents a certain source of fault that occurs during the normal operation.
The format of the displayed bits is: X
8
X
7
X
6
X
5
X
4
X
3
X
2
X
1
. The single bits have the
following meaning:
X
8
: A2 Overflow, analog output 2 has reached its full scale deflection
X
7
: A1 Overflow, analog output 1 has reached its full scale deflection
X
6
: Time Deviation Overflow, the time deviation exceeds ±99.999s
X
5
: Frequency Overflow, the frequency deviation exceeds ±9.999Hz or
the frequency is < 45Hz or > 65Hz
X
4
: REF Free, no pulse per second (PPS) from the reference
X
3
: PL Free, no power line detected (PL time runs free)
X
2
: No Time String, no serial time string from the reference
X
1
: No PL Init, the PL time has not been initialized (yet)
The "Fail"-LED is on whenever one of the error bits X
1
to X
4
is set whereas the
"Overflow"-LED is switched on by one of the error bits X
5
to X
8
.
The error bits can be red out via the serial port COM0 by sending the character 'E'
(ASCII code 45h). The format of the return string is:
ERROR:X
8
X
7
X
6
X
5
X
4
X
3
X
2
X
1
Menu Serial Number
The serial number of the FDM511 is displayed in this menu. This number may be helpful
to know if the user asks Meinberg for support. The most significant eight digits of the
serial number are displayed first, after pressing the Set button the next digits are shown.
The serial number and the firmware revision of the FDM511 can be red out by sending
the three characters "SN!" via COM0 to the module that returns the following string:
SN: 041110000990 REV:01.00/01