How to customize the serial display
The serial port control screen is based on the LCD screen with a control board added. The control board has an MCU and a screen driver chip. The upper computer can control the display by sending instructions through RS232/RS485, which makes customers do not need to spend energy learning how to use the screen. can achieve the desired effect
Provide your requirements for the serial control panel
Provide the display screen size, overall size of the driver board, communication interface, operation interface and other information you need, and we will design drawings according to your requirements for your confirmation
Confirm communication protocol
The serial port control display communicates with the host computer through RS232/RS485 and other interfaces, we will provide a communication protocol according to your operation interface, and display the content you want according to the content of the protocol
Communication test between the serial port control panel and your device
What are the contents of the communication protocol?
The communication protocol includes the physical interface and software settings, as well as the format and content of each instruction. Below is a part of the agreement of a mass-produced project, which may be useful to you
communication protocol
1.Protocol description
Physical layer: RS232
Wave rate: 9600bps
Data bits: 8
stop bits: 1
check: no check
2.Protocol
2.1 Message format
Frame：1Byte，header：2Byte，Length Command：1Byte，Data：nBytes，Check Frame：1Byte， tail：1Byte
Frame header: 0x7A
Length: including “length”, “command” and “data”
Command: the operation sent to the display
Data: the information carried by the command
Check: the lowest byte of the sum of the three items of data “length”, “command” and “data”
Frame end: 0x78
2.2 Data Types
Data Type Description and Requirements
BYTE Unsigned single-byte integer (1 byte, 8 bits)
WORD Unsigned double-byte integer (2 bytes, 16 bits)
DWORD Unsigned four-byte integer (4 bytes, 32 bits)
STRING GBK encoding
2.3 Command description
2.3.1 Display heartbeat【0x01】
Command description: 0x01
Data direction: display screen—>power exchange cabinet
Sending method: sending at intervals of 1 second
Data description:
No. Description Data type Remarks
1 Heartbeat sequence number BYTE Range: 0-255
2.3.2 Cabinet information【0x02】
Command description: 0x02
Data direction: power exchange cabinet —> display screen
Sending method: sending at intervals of 1 second
Data description:
No. Description Data type Remarks
1 Number of cabinet doors BYTE Range: 1-16
2 Cabinet ID length BYTE Range: 0-12
3 Enclosure ID STRING
4 Device status BYTE 0: offline 1: online
5 Signal strength BYTE Range: 0-31
6 Cabinet power WORD Accuracy kW
7 Cabinet voltage WORD accuracy 0.1V
8 Cabinet current WORD accuracy 0.1A
9 Cabinet temperature WORD Indicates the range: -50 degrees +120 degrees
More than 50 means + temperature
50 means 0 degrees
Below 50 means – temperature
10 Cabinet time BYTE[7] BYTE[0-1]: year
BYTE[2]: month
BYTE[3]: day
BYTE[4]: hour
BYTE[5]: minutes
BYTE[6]: seconds
2.3.3 Battery information【0x03】
Command description: 0x03
Data direction: power exchange cabinet —> display screen
Sending method: sending at intervals of 1 second
Sending method: sending at intervals of 2 seconds
Data description:
No. Description Data type Remarks
1 Door number BYTE Range: 0-16
2 Warehouse door temperature WORD Indicates the range: -50 degrees +120 degrees
More than 50 means + temperature
50 means 0 degrees
Below 50 means – temperature
3 Whether there is a battery or not BYTE 0: No battery exists 1: There is a battery
4 Battery disabled flag BYTE 0: Not disabled 1: Disabled
5 Battery specification BYTE[2] BYTE[0]: voltage level
BYTE [1]: Ann. Hour
6 battery voltage WORD accuracy 0.1V
7 battery current WORD accuracy 0.1A
8 battery temperature WORD Indicates the range: -50 degrees +120 degrees
More than 50 means + temperature
50 means 0 degrees
Below 50 means – temperature
9 Battery SOC BYTE Range: 0-100
10 battery code length BYTE range: 0-64
11 battery code STRING
2.3.4 Text information [0x04]
Command description: 0x04
Data direction: power exchange cabinet —> display screen
Sending method: one-time sending
3.protocol example
Protocol data frame bytes are represented by Hex.
Data Frame:
7a 00 20 02 0c 0a 38 30 30 30 30 30 30 30 39 39 01 1e 01 07 09 3e 00 bd 00 26 14 16 03 02 0a 37 20 13 78
Parse:
Frame header: 7a
Length: 00 20 (32)
Command: 02
Number of cabinet doors: 0c
Cabinet code length: 0a
Cabinet ID: 38 30 30 30 30 30 30 30 39 39 (8000000099)
Device status: 01 (Online)
Signal Strength: 1e (0x1e=30)
Cabinet electrical degree: 01 07 (0x0107=263 means 26.3 degrees)
Cabinet voltage: 09 3e (0x093e=2366 means 236.6V)
Cabinet current: 00 bd (0x00bd =189 means 18.9A)
Cabinet temperature: 00 26 (0x0026 =38-50 means -12 degrees)
Cabinet time: 14 16 03 02 0a 37 20 (2022-03-02 10:55:23)
checksum: 13
End of frame: 78
