Drive circuit 1

Type: EL-210

Short Description:

The drive circuit of erbium glass laser is developed for erbium glass laser source of laser rangefinders, which is able to realize work state and parameters setting of erbium glass laser. The drive circuit can be applied to lasers with 100μJ~500μJ pulse energy. In order to achieve compatibility with lasers with different pulse energy， drive current varies with lasers. Except that, the dimension, interface and communication protocol of drive circuit for different lasers are the same.

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Product Detail

Interface

Communication protocol

Product Tags

Parameters

Parameters	Specification
Power supply	DC12V(24V it can be customizable)
Interface	RS422
Drivers	Maximum current: 6A(100μJ laser), 12A(200μJ laser), 13A～15A(300μJ laser), 14A～16A(400/500μJ laser) (it can change resistance value to achieve current changing) Maximum pulse width: 3ms（it can be set by serial port command）
Driving control	It can control drive frequency and switch by RS422.
Driving current	100μJ laser: 6A /200μJ laser: 12A/300μJ laser: 13A-15A 400/500μJ laser: 14A-16A
Driving voltage	2V
Discharge frequency	≤10Hz
Power supply mode	DC 5V
Trigger mode	External trigger
External interface	TTL（3.3V/5V）
Pulse width(Electric discharge)	It depends on external signal,＜3ms
Current stability	≤1%
Storage temperature	-55~75°C
Operating temperature	-40~+70°C
Dimension	26mm21mm7.5mm

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Interface

LD+ and LD- connect to positive pole and negative pole respectively. It shown as following:

External interface

As shown above, XS3 is an external interface, it can connect to external power supply and upper computers. Connection information as shown as follows:

1	RS422 RX+	Interface
2	RS422 RX-	Interface
3	RS422 TX-	Interface
4	RS422 TX+	Interface
5	RS422_GND	GND
6	VCC 12V	12V power supply
7	GND	Power supply GND

Form：RS422, Baud rate：115200bps

Bits：8 bits(a start bit,a stop bit, no parity). Data consists of header bytes, commands, length of bytes, parameters and parity check bytes.

Communication mode：master-slave mode. An upper computer sends orders to the drive circuit, the drive circuit receive and carry out orders. In working mode, the drive circuit will send data to an upper computer periodically. Details of orders and forms as shown as following.

1) An upper computer sends

Table 1 Sending form

STX0

CMD

LEN

DATA1H

DATA1L

CHK

Table 2 Sending form specification

NO.	Name	Specification	Code
1	STX0	Start mark	55(H)
2	CMD	Command	Shown as table 3
3	LEN	Bytes length （except STX0, CMD and checkout bits）	/
4	DATAH	Parameters	Shown as table 3
5	DATAL	Parameters	Shown as table 3
6	CHK	XOR checkout (Except check bytes, all the bytes can have XOR checkout)	/

Table 3 Command and bits specification

NO.	Commands	Specification	Bytes	Note.	Length	Example
1	0×00	Stand by (continuous working stops)	DATAH=00（H） DATAL=00（H）	Drive circuit stops	6 Bytes	55 00 02 00 00 57
2	0×01	Single working	DATAH=00（H） DATAL=00（H）		6 Bytes	55 01 02 00 00 56
3	0×02	Continuous working	DATAH=XX（H） DATAL=YY（H）	DATA= working cycle, unit: ms	6 Bytes	55 02 02 03 E8 BE (1Hz operating)
4	0×03	Self-check	DATAH=00（H） DATAL=00（H）		6 Bytes	55 03 02 00 00 54
5	0×06	Total numbers of light output	DATAH=00（H） DATAL=00（H）	Total numbers of light output	6 Bytes	55 06 02 00 00 51
13	0×20	Overtime setting of continuous operating	DATAH=00（H） DATAL=00（H）	DATA=overtime of continuous operating, unit: min	6 Bytes	55 20 02 00 14 63 （20min）
12	0xEB	NO. check	DATAH=00（H） DATAL=00（H）	Circuit board NO. check	66Bytes	55 EB 02 00 00 BC

2)An upper computer receives

Table 4 Receiving form

STX0

CMD

LEN

DATAn

DATA0

CHK

Table 5 Receiving form specification

NO.	Name	Specification	Code
1	STX0	Start mark	55(H)
2	CMD	Command	Shown as table 6
3	LEN	Bytes length （except STX0, CMD and checkout bits）	/
4	DATAH	Parameters	Shown as table 6
5	DATAL	Parameters	Shown as table 6
6	CHK	XOR checkout (Except check bytes, all the bytes can have XOR checkout)	/

Table 6 Command and bits specification

NO.	Commands	Specification	Bytes	Note.	Length
1	0×00	Stand by (continuous working stops)	D1=00（H） D0=00（H）		6 Bytes
2	0×01	Single working	D3 D2 D1 D0		8 Bytes
3	0×02	Continuous working	D3 D2 D1 D0		8 Bytes
4	0×03	Self-check	D7 ~D0	D5-D4: -5V, unit:0.01V D7-D6:+5V, Unit: 0.01V（＜450V is under-voltage）	13 Bytes
6	0×06	Total numbers of light output	D3~D0	DATA=Total numbers of light output(4 bytes, the most significant byte is in front)	8 Bytes
9	0xED	overtime operating	0×00 0×00	Laser is under protection and stops working	6 Bytes
10	0xEE	Checkout error	0×00 0×00		6 Bytes
11	0XEF	Serial port read timeout	0×00 0×00		6 Bytes
18	0×20	overtime setting of continuous operating	DATAH=00（H） DATAL=00（H）	DATA=overtime of continuous operating, unit: min	6 Bytes
12	0xEB	NO. check	D12…… D0	D10 D9 NO. of drive circuit D8 D7 software version	17 Bytes
Note：Undefined data bytes/bits. Default value is 0.