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LTDVE4CH-20 | INSTRUCTIONS MANUAL
Either the RUN LED or the ERR LED blinks for 500 ms at power on to identify the source used for
the settings.
The green RUN LED blinks when the controller starts by using the settings stored in the non-volatile
memory (the last configuration saved by the customer). The red ERR LED blinks when the controller
reverts to using the factory settings due to user activation of the INIT button (see next section for
more information on the INIT button) or a corruption in the stored customer settings.
Please note the logic supply must be present in order for all the LEDs to turn on.
11. INIT button functions
The INIT button is used either to restore the factory settings or to activate the firmware update
procedure. The INIT button is sampled once at power up.
If the button is sampled as pressed, the user is given a ten seconds interval to start the firmware
update procedure (see
). If the firmware update procedure is not started in then ten
seconds interval, the settings are restored to the factory values and the controller resumes normal
operation.
During the ten seconds interval the RUN and ERR LEDs blink at a high rate to emphasize the
circumstance. In the meantime, the use of the serial RS485 interface is restricted to the firmware
update and the Modbus/TCP, Modbus/UDP and HTTP protocols are not available.
The INIT button is concealed by a hole located between the terminal blocks and the shell connector.
12. Pulse shaping logic
Each of the four channels can be individually configured to output pulses based either on a discrete
external trigger signal or an internally-generated trigger. A wide variety of internal triggers can be
produced by configuring the internal pulse shaping logic.
This logic includes eight pulse generators and several multiplexers. The pulse generators allow pulse
delay and width control down to 1 µs resolution. The multiplexers, organized as two routing matrices,
allow for the flexible selection of the pulse generators inputs and outputs.
An output protection circuit, used to prevent the light from getting overheated and thus damaged, is
also included in this logic.
12.1. Diagram of internal logic
Figure 4: diagram of internal logic network
depicts the logic network built in the
controller.
