# Reading Real Number with Modbus TCP/IP

**URL:** https://discourse.nodered.org/t/reading-real-number-with-modbus-tcp-ip/22328
**Category:** Industrial
**Created:** [27 February 2020 13:12 UTC](https://discourse.nodered.org/t/reading-real-number-with-modbus-tcp-ip/22328 "2020-02-27T13:12:46Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![Ramo96](https://avatars.discourse-cdn.com/v4/letter/r/9e8a1a/32.png) [@Ramo96](https://discourse.nodered.org/u/Ramo96)
#### Post date: [27 February 2020 13:12 UTC](https://discourse.nodered.org/t/reading-real-number-with-modbus-tcp-ip/22328/1 "2020-02-27T13:12:46Z")

</div>

Hello all,  
I want to read real data type which is 2 WORD using Modbus TCP/IP.  
How Can I merge these 2 WORD to obtain Real Number.  
I read before UINT from buffer using these code;

// Create new Buffer based on array bytes  
const buf = Buffer.from(msg.payload.buffer);  
// Represent these bytes as 32-bit unsigned int  
const value = buf.readUInt32BE();  
// save the value

msg.payload = value;  
return msg;

But I dont know how to apply this for REAL number.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/3/73e6220df926a9b516fd8e3e68cea7706eea77e5.png)  
Thanks.

---

<div class="post-metadata">

### Author: ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [27 February 2020 14:13 UTC](https://discourse.nodered.org/t/reading-real-number-with-modbus-tcp-ip/22328/2 "2020-02-27T14:13:54Z")

</div>

Maybe try [https://nodejs.org/docs/latest-v8.x/api/buffer.html#buffer\_buf\_readfloatbe\_offset\_noassert](https://nodejs.org/docs/latest-v8.x/api/buffer.html#buffer_buf_readfloatbe_offset_noassert) ?

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [27 April 2020 14:17 UTC](https://discourse.nodered.org/t/reading-real-number-with-modbus-tcp-ip/22328/3 "2020-04-27T14:17:27Z")

</div>

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.