User's Guide ______________________________________________________________________
168 _________________________________________________________________ M210667EN-C
Table 22 LT31 Transmitter Status (Byte Number 29)
Code Explanation Comment
0 OK
W Warning Examples:
Window receiver saturated.
Main/window transmitter light source
aging warning.
Window contamination above limit.
A Alarm Example:
Internal monitoring alarm exceeded
limit.
E Error Hardware error.
C Communication
error
Device not responding.
The byte shown in Table 23 below indicates the status of the main
transmitter module LTL112 which is located in the transmitter
measurement unit LTM112 of the LTT111 (LT31 transmitter).
Table 23 LT31 Transmitter: Main Transmitter Module (Byte
Number 30)
Code Explanation Comment
0 OK, normal
operation
2 Light source
aging warning
Transmitter derating signal
reached warning limit.
4 Hardware
warning
Internal monitoring alarm signal
exceeded limit.
8 Hardware error Examples:
Intensity signal out of limits.
EEPROM and/or temperature
sensor failure.
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 24 on page 169 indicates the status of the
window tran
smitter module LTL212 which is located in the transmitter
measurement unit LTM112 of the LTT111 (LT31 transmitter).
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