YuParse

YuParse is a lightweight and efficient ASCII/text parser designed for real-time data extraction on the edge. It is a core component of the YuDash Axon processing engine and is optimized for structured sensor output from industrial instruments such as weather stations, weighing scales, and transmitters.

YuParse uses a pattern-matching approach where users define a template string with token identifiers (like #D1, #I2, #T, #A1, etc.) to extract specific fields from continuous or formatted ASCII inputs. It is tolerant to inconsistent whitespace and supports both data capture and structural matching.

YuParse simplifies the challenge of parsing vendor-specific ASCII formats by providing a flexible yet deterministic framework that decouples pattern logic from parsing code. It enables high-throughput, low-overhead data structuring — critical for scalable IIoT deployments.

The values extracted by YuParse can be directly utilized in various downstream pipelines. Parsed fields can be published to MQTT or HTTP endpoints. Additionally, these values can be fed into YuDash’s built-in Modbus RS485 or TCP/IP server, enabling seamless SCADA or PLC integration. This makes YuDash a powerful edge converter — capable of translating vendor-specific ASCII outputs into json payloads or Modbus-readable registers.

Reading text data from RS485/RS232 device

The reading of text data from RS485 (or RS232) port is handled as custom "Modbus" registers, as explained here. The raw input data is received as a variable in YuDash flow. This is the "inputVar" to YuParse engine.

YuParse Settings with Axon block

// YuParser block within axonSettings

"axonSettings":
{
  "parseArray": [
    "inputVar": "temp_string",
    "pattern": "temp1=#D1 ,  humid=(#D2)",
    "tagArray":[
      {
        "tagName": "D1",
        "varName": "t1"
      },
      {
        "tagName": "D2",
        "varName": "humid2"
      }
    ] 
  ]
}

Key	Type	Description
inputVar	string	Name of the input variable holding the ASCII string to be parsed. This is typically read through Modbus modules.
pattern	string	YuParse-compatible pattern using tokens like #D1, #A1, etc. This will be matched with the inputVar.
tagArray	array	List of mappings between token tags and output variable names.
tagName	string	The token ID from the pattern (e.g., "D1", "A2", "T")
varName	string	Custom variable name to use in downstream logic, MQTT, Modbus, etc.

Tokens

Pattern Element	Type	Stored?	Description
#D1, #D2	Decimal/Float	✅ Yes	Parsed as float
#I1, #I2	Integer	✅ Yes	Parsed as integer
#T	Timestamp	✅ Yes	Epoch timestamp
#S1, #S2	String	✅ Yes	Any text until next whitespace
#A1, #A2	Alphanumeric	✅ Yes	Strictly alphanumeric (letters and digits only)
#D, #S, #A	Match-only	❌ No	Used for pattern alignment; parsed but not stored
Non-token word	Literal Match	❌ No	Must exactly match input, ignoring extra whitespace

Examples

Input String	YuParse Pattern	Parsed Values
TEMP=23.4 RH=65.2	TEMP=#D1 RH=#D2	D1=23.4, D2=65.2
STATUS=(OK) VALUE=99.8	STATUS=(#A1) VALUE=#D1	A1=OK, D1=99.8
Device=ABC TEMP=45.0 UNIT=C	Device=#S TEMP=#D1 UNIT=#S	D1=45.0
t=21.5 , humid=(64.2)%	t=#D1 , humid=(#D2)%	D1=21.5, D2=64.2
(Gross) 125.67 kg (Tare) 5.00 kg	(Gross) #D1 kg (Tare) #D2 kg	D1=125.67, D2=5.00
TEMP:23.4,HUMIDITY:55.6	TEMP:#D1,HUMIDITY:#D2	D1=23.4, D2=55.6
S/N=SNX123 Value=7.89	S/N=#A1 Value=#D1	A1=SNX123, D1=7.89
Sensor1=OK Pressure=102.56 mbar	Sensor1=#A1 Pressure=#D1 mbar	A1=OK, D1=102.56
DATA: A23 B56 C99	DATA: #A1 #A2 #A3	A1=A23, A2=B56, A3=C99
WSpd=5.2 Dir=NW Temp=21.3	WSpd=#D Dir=#A1 Temp=#D2	A1=NW, D2=21.3