Meinberg FDM509 - Manual (Page 11)

11
Error Bits
FDM509 provides eight error bits that can be read out via the serial port COM0 by
sending the character 'E' (ASCII code 45h). Any error bit reports a corresponding
error event that occurs during operation. The format is:
ERROR:X
8
X
7
X
6
X
5
X
4
X
3
X
2
X
1
The meaning of the error bits is:
X
1
: Fail (equal to LED Fail), an error occured and the serial output is stopped,
can be cleared only by a reset
X
2
: No Time String, FDM509 waits for the serial time string
X
3
: No 10MHz, missing reference clock, can be cleared only by a reset
X
4
: No PPS, no pulse per second, can be cleared only by a reset
X
5
: No Power Line, a mains frequency can not be detected,
can be cleared only by a reset
X
6
: Time Deviation Overflow (equal to LED Overflow), time deviation > ±100s
X
7
: A1 Overflow, analog output 1 has reached its full scale range
X
8
: A2 Overflow, analog output 2 has reached its full scale range
The error bits can be red out during normal operation as well as after an error occurs
and the serial output is stopped. In the second case the last measure string before the
output was stopped will be sent out once more, additional to the error bits.
Analog Values
The values of the two analog outputs provided by FDM509 can also be red out via the
serial port COM0 by sending the character 'A' (ASCII code 41h). FDM509 sends a
string with the following format:
A1:XXXX_A2:XXXX
The values are given in hex code (0000h ... FFFFh). The initial state is 8000h.