Operation
EL190446 Version: 3.0.0
5.5 Diagnostics
5.5.1 Diagnostic LEDs
The LEDs Diag 1 to Diag 4 display diagnostic information for the EL1904.
5.5.1.1 Diag 1 (green)
The Diag 1 LED indicates the state of the TwinSAFE interface.
Flashing Code Meaning
LED illuminated continuously normal operation:
TwinSAFE communication OK
rapid flickering, alternating with 1 flash pulse Error in S parameter (TwinSAFE parameter)
rapid flickering, alternating with 2 flash pulses Error in I parameter (Individual parameter)
rapid flickering, alternating with 3 flash pulses Waiting for S and I parameter
rapid flickering, alternating with 4 flash pulses S- and I-parameter correct:
waiting for first host message
rapid flickering, alternating with 5 flash pulses Watchdog error
rapid flickering, alternating with 6 flash pulses CRC error
rapid flickering, alternating with 7 flash pulses Sequence number error
rapid flickering, alternating with 8 flash pulses Communication error in the TwinSAFE protocol
5.5.1.2 Diag 2 (red)
The Diag 2 LED illuminates red if the terminal detects an external supply or cross-circuit. The LED
extinguishes once the error is rectified.
5.5.1.3 Diag 3 (red) and Diag 4 (red)
If the Diag 3 LED is lit, the Diag 4 LED indicates internal terminal errors.
Flashing Codes
In the case of such an error, the Diag 4 LED on the EL1904 displays flashing codes that describe the error in
more detail.
A flashing code consists of four sequences, which are interrupted in each case by a short break. After the
four sequences there is a long break, following which the flashing code is displayed again.
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