Parameters

Installation

Please be sure to refer to the laser manual, the wiring sequence of the corresponding connector, and the connection on the circuit board to make sure that the laser is compatible with the current wiring sequence. Powering on with an incorrect wiring sequence may damage the laser!

The negative input of the power supply of the module, the bottom plate and the negative pole of the NTC are all grounded. And the positive and negative poles of the drive output are not grounded. When any function pin of the laser to be installed is grounded (connected to its shell), special attention should be paid.

When there is a grounding situation of the laser function pin (such as the positive pole of the laser is grounded), a piece of sticky thermal conductive silicone needs to be placed between the laser and the bottom shell, and do not use metal screws to fix the laser to insulate the laser shell from the bottom shell. If you are not sure, please consult the engineer of the seller. Improper grounding will cause abnormal function of the module or even burn the laser!

Line configuration

Before powering on, the module needs to adjust the circuit parameters to adapt to the installed laser. The parameters are controlled by the jumper and dip switch on the circuit board. Be sure to operate with power off!

Please set the Max. drive current of LDRVMLN to be equal to or slightly larger than the Max. allowable current of the laser. If the drive current is set too high, the risk of burning out the laser will increase. Set the jumpers P3 and P10 on the circuit board:

Current selection jumper status	Instrument model/maximum drive current
	LDRVMLN150         149mA
	LDRVMLN380         378mA
	LDRVMLN600         624mA
	LDRVMLN400         394mA

The jumpers P3 and P10 must be consistent, otherwise the instrument will not work properly! All operations should be performed with the power off.

If the laser has a built-in voltage divider resistor, try not to use it, as it will cause insufficient external drive voltage and the laser will be in an undervoltage state.

The green light indicates that the temperature has stabilized. Use a jumper cap to short RX and GND to start the current source. Please use this function after the parameters are fully set!

External signal input

The signal input terminal INPUT on the rear panel of the instrument is used to receive external input. When the internal bias signal is not turned on, the equivalent circuit is shown in the figure below:

The driving current of the laser is:

ILaser = (V1/1.25V) x Imax

Imax=149mA, 378mA etc

When the internal signal is turned on, the equivalent circuit is as follows:

If only internal signals are used, all connections on the INPUT interface should be disconnected. If internal and external signals are to be used simultaneously, please calculate the final effect yourself according to the equivalent circuit mentioned above.

PC control interface

Replace the instrument cover, connect the controller to the power supply, and connect it to the computer with a USB cable. WIN7 and above systems will prompt to automatically connect to the Internet to install the USB driver. When using other systems or unable to connect to the Internet

Please download the corresponding driver at http://www.ftdichip.com/Drivers/VCP.htm. After the driver is installed, a virtual serial device will appear in the "Device Manager".

Open the computer-side dedicated software, as shown below:

The computer is the main control end (host computer) and sends a string command. A line of command starts with a colon ":" and ends with a carriage return (\r\n). The lower computer returns information after execution. All the following functions can be accessed through the supporting software.

It is recommended to complete the settings with the supporting LDPD software and get the correct waveform, then click Save to save the parameters to the lower computer, and then transfer it to other clients for control.

The operation mode is as follows:

Parameter settings: