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Home > LCD Module > Instrument&Pin-Board > 4-Bit 0.56 Inch LED Digital Tube RS485 Display Screen Module PLC Communication DC 7-36V

4-Bit 0.56 Inch LED Digital Tube RS485 Display Screen Module PLC Communication DC 7-36V

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Feature:
1>. Easy to install, it can be embedded by opening a hole on the panel
2>. Built-in switch power switch, wide input voltage range, high conversion efficiency; and it can operate for a long time
3>. Reverse connection protection of power input port
4>. RS485 bus interface has overvoltage and overcurrent protection
5>. Industrial temperature range
6>. Support combination display, such as minus sign, decimal point and ASCII characters like A B C D E F P L etc

Parameter:

Parameter Value
Model LED-485-056
Digital Tube Size 0.56 inch
Display Color Red
Shell Size 79*43*21.5mm
Hole Size 76*39.2mm
Voltage DC 7-36V; Recommend 12V or 24V
Current 30mA (24V)
Interface KF128-4P
Operating Temperature -40~85 Celsius

Pin Definition:
1>. VCC: power positive
2>. GND: power negative
3>. A/T: RS485 bus A 232 serial port transmitting port
4>. B/R: RS485 bus B 232 serial port receiving port
5>. Communication Interface: non-isolated, 485 bus and GND terminal is commonly ground

Serial Port Parameters:
1>. Baud Rate: 1200bps/2400bps/4800bps/9600bps (default value 9600bps)
2>. Start Bit: 1
3>. Stop Bit: 1
4>. Data Bit: 8
5>. Check Bit: no
6>. Protocol: support ASCII text and Modbus RTU dual protocol auto identification; it is unnecessary to users to set

Communication Protocol: (ASCII)

Command Features
Show Command(Digital tube no response)
$001,1234# Display 1234,001 is the address code of the screen
$001,8.8.8.8.# All display 8, the decimal points are all on
$001,12.34# Display 12.34
$001,# no display
$001,002@ Modify display address,default 0x01;
This command is to change address code 1 into 2;
This parameter can be saved even if power off
$001,7% Modify screen brightness level (0-7 level); 0 means the darkest; 7 means the brightest; default value 7
   
Control Command(Digital tube has response)
$001,01& Serial port response test;
Digital tube return: 2 ASCII characters, OK;
Digital tube display: YES
$001,02& Inquire digital tube type;
Digital tube return: “056” or “080” ASCII character string;
Digital tube display: “056” or “080”
$001,03& Inquire digital tube software version;
Digital tube return: “U1.2” etc;
Digital tube display: “U1.2” etc
$001,04& Inquire digital tube brightness parameter;
Digital tube return: “b-0” ~ “b-7” ASCII character string;
Digital tube display: “b-0”, “b-7” etc


Communication Protocol: (MODBUS-RTU)

RS485 Address Function Code Data CRC Check
Byte Byte N bytes 2 bytes

Address: station Modbus address, one byte. Range: 1-254, 0 and 255 reserved (broadcast address)

Function Code: one byte. For example, 0x03, 0x04 read register; 0x06 write single register; 0x10 means multiple registers

Data:N bytes, the format is defined by the function code

CRC Check: Modbus CRC check, two bytes

 

Function Command
06H Function Code
Show decimal number PLC Send: 01 06 00 00 22 B8 91 18
01: digital tube screen station number (RS485 address)
06: function code
00 00: digital tube screen display register (integral number)
22 B8: display data. 2-bit character integral numbers; high byte is in the front
22 B8 means display 8888
Negative number displayed as complement; FF FF means -1, FF FE means -2
91 18: two bytes CRC codes
Digital tube screen return: 01 06 00 00 22 B8 91 18
Note: this command needs to use with below instructions. Power on default status is no decimal point
Set Numbers of Decimal Points PLC Send: 01 06 00 04 00 01 09 CB
01: digital tube screen station number (RS485 address)
06: function code
00 04: digital tube screen decimal point register
00 01: numbers of decimal points (range: 00 00-00 03). 1 means the first number after decimal point. For example, 32.4
00 00 means no decimal point
09 CB: two bytes CRC codes
Digital tube screen return: 01 06 00 04 00 01 09 CB
Note: after power on, PLC master only needs to send this instruction for once, then this parameter will be lost after power failure; combining with above command (00 04) register can display number with decimal points
Modify Address Code PLC send codes to the screen via 485: 01 06 00 02 00 02 A9 CB
01: digital tube screen station number (RS485 address)
06: function code
00 02: digital tube screen RS485 address register
00 02: new address code (00 01-00 FE)
A9 CB: two bytes CRC code
Digital tube screen return: 01 06 00 02 00 02 A9 CB
Note: this parameter will be saved forever, and it won’t be lost even if power failure; default value 0x01
Modify Baud Rate PLC send codes to the screen via 485: 01 06 00 03 00 03 39 CB
01: digital tube screen station number (RS485 address)
06: function code
00 03: digital tube screen RS485 address register
00 03: new baud rate (00 00-00 07)
00: 1200; 01: 2400; 02: 4800; 03: 9600;
04: 19200; 05: 38400; 06: 57600; 07: 119200
39 CB: two bytes CRC code
Digital tube screen return: 01 06 00 03 00 03 39 CB
Note: this parameter will be saved forever, and it won’t be lost even if power failure; default value 03
Brightness Adjustment PLC send: 01 06 00 05 00 07 D8 09
01: digital tube screen station number (RS485 address
06: function code
00 05: digital tube screen brightness register
00 07: new brightness (range: 00 00-00 07); 0 means the darkest, 7 means the brightest
D8 09: two bytes CRC code
Digital tube screen return: 01 06 00 05 00 07 D8 09
Note: this parameter will be saved forever, and it won’t be lost even if power failure; default value 7
Show decimal number(with positive negative characters and decimal points) PLC send: 01 10 00 90 00 02 04 00 02 01 EA DB 1C
01: digital tube screen station number (RS485 address)
10: function code, means multiple registers
00 90: digital tube screen display register (integral number with decimal point and positive negative character)
04: Number of registers
00 02: 00 means positive negative character (00=positive number; 01=negative number; before the number it displays -)
02 means certain place number of decimal point; 0 means no decimal point; 2 means 2-digit number after decimal point
01 EA: 2-digit integral number, high byte is in the front. 01 EA means 10 hexadecimal  490
DB 1C: two bytes CRC code
This command will display “4.90”
Digital tube screen return: 01 10 00 90 00 02 41 E5
For Example:
(1)01 10 00 90 00 02 04 01 01 00 0A 2A F8 display “-1.0”
(2)01 10 00 90 00 02 04 00 01 00 02 2A C2 display “0.2
Display ASCII Character String PLC send: 01 10 00 70 00 06 0C 50 32 2E 33 00 00 00 00 00 00 00 00 3B 25
01: digital tube screen station number (RS485 address)
10: function code, means multiple registers
00 70: digital tube screen display register (ASCII)
00 06: number of registers
0C: data segment byte numbers
50 32 2E 33 00 00 00 00 00 00 00 00: ASCII character string. Fixed length 12 bytes; when the length is not enough, the right of character string should fill in 00. As to this example, it means ASCII character string “P2.3”
3B 25: two bytes CRC code
This command will display “P2.3”
Digital tube screen return: 01 10 00 70 00 06 41 D0
Example:
(1)01 10 00 70 00 06 0C 2D 2D 2D 00 00 00 00 00 00 00 00 00 43 A3
    display “---”, 2D is minus ASCII code
(2)01 10 00 70 00 06 0C 38 2E 38 2E 38 2E 00 00 00 00 00 00 89 80
    display “8.8.8”, all the numbers will be on; 2E is decimal point ASCII code


Parameter Settings (Manual):
Function Key: SW1 (Menu, up), SW2 (down), open the meter, the key can be seen
Long press SW1 will enter into menu interface; if long press again, the page will cycle in “normal display”, “address set”, “baud rate set”, “power on default display”, “brightness set”, “save” function menus
In every function menu, SW1, SW2 will increase or decrease the parameter.


Power On Default Display: “d-0” power on display 0; “d-A” power on displays local address
Save: up, down separately select yes/no; then long press SW1 key, save the parameter; the menu will jump into normal display page.



 

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4-Bit 0.56 Inch LED Digital Tube RS485 Display Screen Module PLC Communication DC 7-36V
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