# RS232 to Modbus TCP - Rego 637

**URL:** <https://discourse.nodered.org/t/rs232-to-modbus-tcp-rego-637/34934>\
**Category:** Industrial\
**Created:** [28 October 2020 07:47 UTC](https://discourse.nodered.org/t/rs232-to-modbus-tcp-rego-637/34934 "2020-10-28T07:47:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pimpera](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@pimpera](https://discourse.nodered.org/u/pimpera)\
**Post date:** [28 October 2020 07:47 UTC](https://discourse.nodered.org/t/rs232-to-modbus-tcp-rego-637/34934/1 "2020-10-28T07:47:32Z")

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Hello.  
I try to. I'm learning. But I don't know how to do it.  
I have a Raspberry PI 3B +. I need an RS232 to Modbus TCP converter.  
I have a REGO 637 regulation. The protocol is on the web:

[[http://rago600.sourceforge.net](http://rago600.sourceforge.net).] (https: // REGO 637)

I need the resulting Modbus TCP format for control.  
I would like to solve this with Node-RED.

Thank you for your help.

for example. I have for the Weintek MT8070iE panel

// Free protokol IVT - Ctení GT1 - Zpatecka  
macro\_command main()

char command[9], response[5], on\_off  
int address, data, read\_data  
short address\_pom, data\_pom, checksum  
short return\_value, i  
char read\_data1, read\_data2

FILL(command[0], 0, 9) // init dotaz  
FILL(response[0], 0, 5) // init

command[0] = 0x81 // CISLO STANICE - 81  
command[1] = 0x02 // READ (CTENI) - 2

address = 0x000409 // READ ADRESA - 0409

```
HIWORD(address, address_pom)
LOBYTE(address_pom, command[2])
HIBYTE(address, command[3])
LOBYTE(address, command[4])

```

data = 0x000000 // READ DATA - 000000

```
HIWORD(data, data_pom)
LOBYTE(data_pom,command[5])
HIBYTE(data, command[6])
LOBYTE(data, command[7])

```

command[8] = 0x0D // checksum

//short TimeDelayDotaz  
//GetData(TimeDelayDotaz, "Local HMI", LW, 302, 1) // Čte čas spoždění mezi dotazem a odpovědí

//INPORT(response[0], "Free Protocol", 5, return\_value) //Start přenosu  
//DELAY(TimeDelayDotaz) // Pausa  
OUTPORT(command[0], "Free Protocol", 9) // Pošli dotaz  
INPORT(response[0], "Free Protocol", 5, return\_value) // DATA NAVRAT

if return\_value \> 0 then //bez chyby \> 0

```
read_data = (response[1] * 256) + (response[2] * 128) + response[3] // data navrat 00 00 00
SetData(read_data, "Local HMI", LW, 502, 1) //read data 0xff ff ff - Teplota součet kladné
SetData(return_value, "Local HMI", LB, 5800, 1) //Indikace úspěchu čtení 

```

end if  
SetData(return\_value, "Local HMI", LB, 5800, 1) //Indikace neúspěchu čtení

//// =================== LOG Terminal ===============  
char dotaz[20], navrat[10], ukaz[34]  
bool loguj = true //ukazuj ANO

FILL(dotaz[0], 0, 20)  
FILL(navrat[0], 0, 10)  
FILL(ukaz[0], 0, 34)

GetData(loguj, "Local HMI", LB, 5900, 1) // === Bude se LOGOVAT  
if loguj then // Když ano  
short x,y  
y = 0  
for x = 0 to 18  
HEX2ASCII(command, dotaz[y], 2) // dotaz  
y = y + 2  
next x

```
y = 0
for x = 0 to 10
	HEX2ASCII(response[x], navrat[y], 2) // navrat
	y = y + 2
next x

StringCopy(dotaz[0], ukaz[0]) // ======= Slož String pro zobrazená v LOGu
StringCopy("--", ukaz[18])
StringCopy(navrat[0], ukaz[20])
StringCopy("-GT1", ukaz[30])

StringSet(ukaz[0], "Local HMI", LW, 6000, 34) // ======= Uložení dat pro zobrazení v LOGU
bool z = true
SetDataEx(z, "Local HMI", LB, 5997, 1) // Čti právě teď
DELAY(10)
z = false
SetDataEx(z, "Local HMI", LB, 5997, 1) // Dokončení pulzu čtení

```

end if

end macro\_command

---

<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 December 2020 07:47 UTC](https://discourse.nodered.org/t/rs232-to-modbus-tcp-rego-637/34934/2 "2020-12-27T07:47:51Z")

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