Vaisala LT31 - Table 26 LT31 Transmitter: Miscellaneous (Byte Number 33); Table 27 LT31 Receiver Status (Byte Number 34); Table 28 LT31 Receiver: Master CPU Status (Byte Number 35)

User's Guide ______________________________________________________________________
170 _________________________________________________________________ M210667EN-C
Table 26 LT31 Transmitter: Miscellaneous (Byte Number 33)
Code Explanation Comment
0 OK, normal
operation
4 Window heater
error
Temperature difference between
window and enclosure temperature
below limit when heater is on.
8 Alignment
mechanism
No horizontal and/or vertical
position signal.
No movement.
NOTE
The listed status codes do not cover all possible cases. Combinations are
possible if applicable. If, for example, code 1 and code 2 occur at the
same time, it will lead to code 3.
The byte shown in Table 27 below indicates the overall status of the
LTR111 (LT31 receiver unit).
Table 27 LT31 Receiver Status (Byte Number 34)
Code Explanation Comment
0 OK
W Warning Examples:
Window receiver is saturated.
Window transmitter light source
aging warning.
Window contamination above limit.
A Alarm Examples:
Main receiver saturated.
Internal monitoring alarm signal
exceeded limit.
E Error Hardware error.
C Communication
error
Device not responding on module
bus request.
The byte shown in Table 28 below indicates the status of the LT31
m
aster CPU LTC212 which is located in the receiver interface unit
LTI211.
Table 28 LT31 Receiver: Master CPU Status (Byte Number 35)
Code Explanation Comment
0 OK
4 Hardware warning
8 Error Memory error