Hello! My USB Serial Port is not working, what should I do? First you need to be sure that your equipment meets the requirement listed in the app description or Hardware Page (USB-to-Serial Port). None of the instructions below will help if your phone is out of specifications. The following image shows correct components and […]


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Error Codes

Error#3 Connection or Communication Transaction Create Error Error#4 Connection or Communication Transaction Create Error Error#5 Receive Frame Data Decode Error Error#7 Modbus Transaction Execute Error Error#9 Slave Returned Error Error#10 Transaction Response Error Error#11 Response Decode Error Error#12 Error Closing Connection (TCP/UDP socket) Error#14 Response Processing Error Error#15 Read/Write Processing Error Error#17 Packet Transaction ID […]


Hardware Test USB Serial Dongle USB-to-Serial Ports Tested to work with Moto X 1. StarTech.com ICUSB2321F ( FTDI RS232) 2. StarTech.com ICUSB422 ( FTDI RS422/485 w/No Echo) 3. Sabrent, SBT-USC1K (Prolific RS232) 4. SiLab USB Serial Port USB OTG Cable 1. Micro USB Host OTG Cable with Micro USB Power for Nexus 4 5 7 […]

Google Sheets

Log Data in Google Sheets There are two methods to log data into cloud using Modbus Monitor Advanced version. Both methods uses the Google Sheets to log data at period basis. 1) Use Shared Google Sheet (Google account not necessary). Advantage of this method is that no Google account login is required. This option can […]

Import Export

The Modbus Monitor Advanced app have Import and Export features to enhance data transport in various medium. The Import and Export data is supported via Email and Android Memory. In both cases the file format is in CSV format. Import The Import feature is supported via two mediums. Select Import from the Settings Menu to […]


Settings The Modbus Monitor Advanced app have many settings. Each settings is explained below in the tables. Preferences or Communication Settings Links


Write Dialog Upon selection of “Write” option, the Write Dialog is shown. Depending on the Data Type settings two types of write dialog boxes are shown. See image below. The dialog box on the left is shown when the Function is set for all except Coils. When the Function is selected as Coils (0x), the […]

Data Types

Data Types The Modbus Protocol packet doesn’t specify the data type communicated between Master and Slave device. It must known from the manufacturer of the remote device and set correctly in the Modbus Map to view it in the human readable format. The Modbus Monitor Advanced App have many options to translate the raw Modbus […]


Parameters The parameters and their explanations are shown in the table below.