How to combine three consecutive Modbus registers to get an integer value?
Ram
I have to read a device's value using Modbus protocol. It has a value that is 6 bytes long represented by three consecutive Holding Registers. This is graphical representation of both signed and unsigned types.
I can read three registers using a Modbus library in Java. Each register is read as a short value which is 2 bytes. Now I need to know how to combine the three values to form an integer value in both signed and unsigned formats?
Marker
Please keep in mind, I haven't written java in a LONG time so my java is VERY rusty. Because there are no unsigned values in Java it is a little harder. Try something like this:
class ModbusConvert
{
public static long toUnsigned(int register0, int register1, int register2)
{
//NOTE: Assumes long is 64-bit, int is 32-bit
// Convert each register to a long in the appropriate bit position and OR them together
long v2 = (((long)register2) & 0x0FFFF);
long v1 = (((long)register1) & 0x0FFFF) << 16;
long v0 = (((long)register0) & 0x0FFFF) << 32;
return v0 | v1 | v2;
}
public static long toSigned(int register0, int register1, int register2)
{
//NOTE: Assumes long is 64-bit, int is 32-bit
// Convert each register to a long in the appropriate bit position and OR them together
if ((register0 & 0x8000) != 0) register0 |= 0xFFFF0000; // Sign extend
long v2 = (((long)register2) & 0x0FFFF);
long v1 = (((long)register1) & 0x0FFFF) << 16;
long v0 = ((long)register0) << 32;
return v0 | v1 | v2;
}
public static void main(String args[])
{
// Example Register Values (value = 0xFEDC76543210)
int register0 = 0xFEDC;
int register1 = 0x7654;
int register2 = 0x3210;
long unsigned = toUnsigned(register0, register1, register2);
long signed = toSigned(register0, register1, register2);
System.out.println(String.format("UNSIGNED: 0x%016X", unsigned));
System.out.println(String.format("SIGNED : 0x%016X", signed));
}
}
The output is:
UNSIGNED: 0x0000FEDC76543210
SIGNED : 0xFFFFFEDC76543210
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