Differences

This shows you the differences between two versions of the page.

--- mycnc:host_modbus_api [2018/10/14 18:27] – skirillov
+++ mycnc:host_modbus_api [2018/10/14 18:37] – skirillov
@@ Line 8: / Line 8: @@
 ^ Register Name ^ Address ^ Description ^
-| GVAR_XMODBUS_SERVER_ADDR | 5750 | Writing to this register will set Modbus Server Address |
+| GVAR_XMODBUS_SERVER_ADDR | 5750 | Writing to this register sets **Modbus Server Address** |
 | GVAR_XMODBUS_VALUE | 5751 | Writing to this register sets a **Value** that will be sent while **write to Modbus Server** |
-| GVAR_XMODBUS_ADDR2READ | 5752 | Writing to this Register will set Address of Global register to put a result of Modbus Read operation |
+| GVAR_XMODBUS_ADDR2READ | 5752 | Writing to this Register sets **Address of Global register** to put a result of **Modbus Read** operation |
 | GVAR_XMODBUS_READY_READ | 5753 | Ready Read flag. The value is automatically cleared ion start of Modbus read operation. \\ If Read is finished successfully, the value is set to "1". \\  If Read operation is failed, the value is set to "-1". |
 | GVAR_XMODBUS_WRITE | 5755 | Writing to this register initiates Modbus Write operation. \\ Written value is Modbus Server Register address (for Write). \\ A value defined in register 5751 will be sent |
 | GVAR_XMODBUS_READ | 5756 | Writing to this register initiates Modbus Read operation. \\ Written value is a Modbus Server Register address (for Read). \\ Writing to this register will clear READY_READ register (5753). The READ_READY register value will be set to "1" when Read completed successfully. The READ_READY register will be set to "-1" if Read Error happens |
+Example:
+  * Need to write a value of "999" to Modbus Server with Address #7 to register #25,
+  * then read register #24 and save it in global variable register #500
+<code C>
+//Write
+  gvarset(5750,7);  //Set Modbus Server Address
+  gvarset(5751,99); //Set a value to write
+  gvarset(5755,25); //Write to Modbus regsiter #25
+//Read
+  gvarset(5752,500); //Set Register #500 to receive Modbus Read result
+  gvarset(5756,24);  //Read Modbus register #24
+  do
+  {
+    //wait ready_ready
+    timer++;
+  }while(gvarget(5753)==0);
+  if (gvarget(5753)<0)
+  {
+    exit(99); //Modbus Ready Error
+  };
+  a=gvarget(500); //Read modbus result can be used by reading redister #500
+</code>