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Last modified by Iris on 2026/03/30 11:47
From version 7.1
edited by Iris
on 2025/10/22 16:12
Change comment: There is no comment for this version
To version 4.1
edited by Iris
on 2025/10/22 15:35
Change comment: There is no comment for this version

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1667 1667  
1668 1668  == **Communication function block** ==
1669 1669  
1670 -=== **SERIAL_MODBUS_WR** ===
1670 +=== **1. SERIAL_MODBUS_WR** ===
1671 1671  
1672 1672  SERIAL_MODBUS_WR - Modbus master serial communication
1673 1673  
1674 -[[image:1761118509428-681.png||height="227" width="212"]]
1674 +[[image:1761118509428-681.png]]
1675 1675  
1676 +
1676 1676  This function block is the setting function block for sending protocol frames by the Modbus master station (whether RTU or ASCII). When the contact in front of Enable is turned ON, according to the communication port, station number, function code, slave station address, quantity and mapped data address set by the function block, the data frame is combined and sent.
1677 1677  
1678 1678  **Device used**
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1798 1798  
1799 1799  Set the COM2 communication parameters through the SD device.
1800 1800  
1801 -(% style="text-align:center" %)
1802 -[[image:1761119049914-901.png||height="377" width="533"]]
1802 +[[image:file:///C:\Users\Administrator\AppData\Local\Temp\ksohtml2512\wps6.jpg]]
1803 1803  
1804 1804  Enable the function block and its Enable pin, send Modbus serial port master data and wait for the slave respond. Done indicates that the current instruction has been executed, Busy indicates that the serial port is busy, and Active indicates that the current instruction is running (waiting for data to be returned from the slave station).
1805 1805  
1806 -(% style="text-align:center" %)
1807 -[[image:1761120009429-879.png||height="611" width="571"]]
1806 +[[image:file:///C:\Users\Administrator\AppData\Local\Temp\ksohtml2512\wps7.jpg]]
1808 1808  
1809 1809  
1810 -=== **SERIAL_WR** ===
1809 +1. **SERIAL_WR**
1811 1811  
1812 -SERIAL_WR - Custom protocol serial communication
1811 +[[image:file:///C:\Users\Administrator\AppData\Local\Temp\ksohtml2512\wps8.png]]SERIAL_WR - Custom protocol serial communication
1813 1813  
1814 -[[image:1761120169708-257.png||height="307" width="271"]]
1813 +[[image:file:///C:\Users\Administrator\AppData\Local\Temp\ksohtml2512\wps9.jpg]]
1815 1815  
1816 1816  This function block is a setting function block for user defined protocol serial port to send protocol frames. When the contact in front of Enable is turned ON. According to the communication port, sending data mapping address, sending data length, receiving data mapping address, and receiving data length set by the function block, the data frame is sent and waits for the data of the specified length to be returned.
1817 1817  
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1900 1900  
1901 1901  **Application example**
1902 1902  
1903 -* Set the COM2 communication parameters through the SD device.(((
1904 -(% style="text-align:center" %)
1905 -[[image:1761120267443-852.png||height="580" width="498"]]
1906 -)))
1902 +* Set the COM2 communication parameters through the SD device.
1907 1907  
1904 +[[image:file:///C:\Users\Administrator\AppData\Local\Temp\ksohtml2512\wps10.jpg]]
1908 1908  
1909 -
1910 1910  Enables the function block and the Enable pin of the function block, sends custom protocol data and waits for the slave to respond. Done indicates that the current instruction has been executed, Busy indicates that the serial port is busy, and Active indicates that the current instruction is running (waiting for data to be returned from the slave station).
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