Update common.js

lib/common.js

@@ -1,4 +1,5 @@
 'use strict';
+var ieee754 = require('ieee754')
 
 function extractValue(type, len, buffer, offset) {
     let i1;
@@ -6,6 +7,11 @@ function extractValue(type, len, buffer, offset) {
     let buf;
 
     switch (type) {
+
+        case 'ieee754':
+            adapter.log.error("modbus offset = " + offset);
+            return ieee754.read(buffer, offset * 2, false, 23, 4)
+
         case 'uint8be':
             return buffer.readUInt8(offset * 2 + 1);
         case 'uint8le':
@@ -143,6 +149,10 @@ function writeValue(type, value, len) {
     let buffer;
 
     switch (type) {
+        case 'ieee754':
+            buffer = new Buffer(4);
+            buffer.writeUInt32BE(value, 0);
+            break;
         case 'uint8be':
             buffer = new Buffer(2);
             buffer[0] = 0;