ezeio2:scriptref:start

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ezeio2:scriptref:start [2019-09-02 21:27] – S andrehezeio2:scriptref:start [2020-11-12 22:53] – johpar
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 ===== Script reference ===== ===== Script reference =====
-{{indexmenu_n>710}}+{{indexmenu_n>900}}
  
 === ezeio script programming - the PAWN language === === ezeio script programming - the PAWN language ===
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 Although the user script runs in a sandboxed runtime engine, the recommended programming pattern is similar to [[https://en.wikipedia.org/wiki/Cooperative_multitasking|cooperative multitasking]]. Although the user script runs in a sandboxed runtime engine, the recommended programming pattern is similar to [[https://en.wikipedia.org/wiki/Cooperative_multitasking|cooperative multitasking]].
  
-This means that you should avoid long-running loops, and instead make use of blocking calls or system callbacks provided in the function library. +This means that you should avoid long-running loops, and instead make use of system callbacks provided in the function library.
- +
-The following calls are blocking and are allowed in 'superloops': +
- +
-| ''ModbusRead()'' | Read a register block from a Modbus RTU device | +
-| ''RS485WriteRead()'' | Write & Read to the Modbus port in 'raw' mode (not Modbus protocol) | +
-| ''ModbusWriteRead()'' | Write and read Modbus commands on the RTU port | +
-| ''SDICmd()'' | Send a SDI12 command and receive the response | +
-| ''ModbusTCP()'' | Send & Receive Modbus commands on the Ethernet port | +
-| ''sleep()'' | Suspend the script for a short time (process events immediately) | +
-| ''msSleep()'' | Suspend the script for a short time (not processing events - DEPRECIATED) | +
-| ''MBRTU_Read()'' | Read a register from a Modbus RTU device | +
-| ''MBRTU_Write()'' | Write to a register on a Modbus RTU device | +
-| ''MBTCP_Read()'' | Read a register from a Modbus TCP device | +
-| ''MBTCP_Write()'' | Write to a register on a ModbusTCP device | +
-| ''SunSpecIP_Base()'' | Find the base address for a SunSpec/TCP device | +
-| ''SunSpecIP_Ofs()'' | Find the offset for a SunSpec/TCP device | +
  
 The following system callback functions are defined: The following system callback functions are defined:
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 | ''@Key'' | Called when a button is pressed on a connected terminal device | | ''@Key'' | Called when a button is pressed on a connected terminal device |
 | ''@Scan'' | Called when a code is received from a scanner device | | ''@Scan'' | Called when a code is received from a scanner device |
-| ''@J1939'' | Called when a J1939 packet is received | 
  
 === State machines === === State machines ===
  
-A common programming pattern in control applications is to use state machines. PAWN and the ezeio implements strong support for state machines. The following is a typical pattern:+A common programming pattern in control applications is to use state machines. PAWN and the ezeio implements strong support for state machines. The following is a typical pattern showing the startup sequence of an engine. Note that there are three @Tick handlers; one for each state. Also note the "entry" and "exit" functions. For more detail, refer to the PAWN language guide.
  
-<code>+<code javascript>
  
   new count = 0;   new count = 0;
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   main()   main()
   {   {
-    SetTickInterval(500);   // set tick interval to 500ms (0.5s)+    SetTickInterval(100);   // set tick interval to 100ms (0.1s)
     state WAITING;          // start in the waiting mode     state WAITING;          // start in the waiting mode
   }   }
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         state RUNNING;        // yes - we're running         state RUNNING;        // yes - we're running
  
-     if(count++ > 5) +     if(count++ > 50) 
-        state WAITING;        // didn't start in 2.5s? Give up and go back to waiting.+        state WAITING;        // didn't start in 5s? Give up and go back to waiting.
   }   }
      
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   @Tick(uptime) <RUNNING>   @Tick(uptime) <RUNNING>
   {   {
-     if( GetField(2) < 100 ) +     if( GetField(2) < 100 )  // Check if the engine stopped 
-        state WAITING;+        state WAITING;        // ..go back to waiting
   }   }
      
 </code> </code>
  
  • ezeio2/scriptref/start.txt
  • Last modified: 2024-03-01 17:24
  • by andreh