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2-port Modbus RTU/ASCII and Modbus TCP to MQTT gateway

PMQ822

1 x RS232
1 x RS485/422
Ethernet
WiFi

OverviewSetupSpecificationsModels ComparisonInquiryResources

Send data of the devices conneccted to Modbus RTU, Modbus ASCII, and Modbus TCP to MQTT server based on defined scheduled time. And record these data to SD card based on definable interval of time.

Support Modbus TCP to Modbus RTU/ASCII
Support 32 Topics, data length adjustable
Data from Modbus RTU/ASCII port 1 & 2 as topics
Data from 4 remote Modbus TCP socket connections as topics
Easy MQTT settings by web Browser configuration
Easy installation with Windows IP utility
Online Firmware upgrade

MQTT demo data of Temperature and Humidity and CO2

Modbus device data to MQTT server Setup Overview
System Information
Network (WiFi, Ethernet)
Serial ports
MQTT server
Topics
Logger (Instant Data View)

Modbus Digital I/O Analog Input to MQTT

Topic configuration table
Up to 32 topics can be defined

Modbus devices to MQTT server wirelessly over LoRa

Modbus device data to MQTT server Setup Overview
System Information
Network (WiFi, Ethernet)
Serial ports
MQTT server
Topics
Logger (Instant Data View)

Configure System

Configure Network
Wireless and wired Ethernet

Configure Network
Wireless Infrastructure

Configure Serial Parameters

Configure MQTT server

Configure Modbus to MQTT Topics

System Log

MQTT Subscriber
For control devices connected to Serial port 1-2 and TCP socket 1-4

System CPU : MT7688AN MIPS CPU, 580 MHz
RAM : 128M Bytes DDR2 RAM
ROM : 32M Bytes Flash ROM
OS : OpenWRT Linux OS
Ethernet Port Type : RJ-45 Connector
Speed : 10 /100 Mbps  ( Auto Detecting )
Protocol : ARP, IP, ICMP, UDP, TCP, HTTP, DHCP,
Protocol : DNS, NTP
Mode : TCP Server / TCP Client / UDP
Setup : HTTP Browser Setup ( IE , Netscape), Console
Security : Setup Password
Protection : Built-in 1.5KV Magnetic Isolation
WiFi Standard : 802.11b/g/n
Data Rate : 11/54/72.2 Mbps @ 20Mhz Band Width
Modulation : DSSS ; OFDM
Frequency : 2.4GHz
Tx Power 11b : Max. 22dBm
Tx Power 11g/n : Max. 19dBm
Rx Sensitivity : -76dBm@54Mbps; -89.5dBm@11Mbps
Tx Rate : Max. 54Mbps with auto fallback
Tx Distance : Up to 100m
Security : WEP 64-bit / 128-bit data encryption, WPA / WPA2
Antenna : 2 dBi ; RP-SMA connector
Network Mode : Infrastructure; Soft AP ( for Setup )
Mode : TCP Server/ TCP Client/ UDP/ Virtual Com/ Pairing
Setup : HTTP Browser Setup ( IE, Chrome, Firefox )
Security : Login Password
Serial Ports 1 x RS232
1 x RS422/485 ( Surge Protect )
Speed : 300 bps ~ 921.6 K bps
Parity : None , Odd , Even
Data Bit : 5 , 6 , 7 , 8
Stop Bit : 1 , 2
RS-232 Pins : Rx , Tx , GND
RS-422 : Rx+ , Rx- , Tx+ , Tx- ( Surge Protect )
RS-485 : Data+ , Data- ( Surge Protect )
15KV ESD for all signals
Operating Temperature -20 °C ~ 70 °C
Storage Temperature -25 °C ~ 80 °C
Dimensions 95 x 95 x 25 mm ( W x D x H )
Weight 150 ± 5 g
Enclosure Plastic
Power DC 9~32V, 200mA@12V, support DC Jack & Terminal Input
PoE Power over Ethernet 802.3 af (optional )
LED Indicator SYS, WiFi, RX, TX, LAN
Watch Dog Function Yes
Warranty 1 year

Modbus MQTT Model Comparison

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    Recommended configuration for firmware version 1.3.2

    File Description File size
    zip CvIotFinder Setup 1.0.9 IP search utility CvIotFinder
    		 26 MB
    pdf Modbus Device to MQTT User's Manual Modbus Device to MQTT User's Manual
    		 2 MB
    zip Modbus to MQTT Firmware version 1.2.15 (Oct. 26, 2022) This firmware fixes the bug that it reverts back to RTU when changing to Modbus ASCII and clicking <Save>.
    		 1 MB
    rar Modbus to MQTT Firmware version 1.3.2 Modbus to MQTT Firmware version 1.3.2 (Feb. 17, 2023)
    		 811 KB