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Comprehensive technical specifications, protocol references, and integration guides for Quantum Bit Solutions Modbus products

Product Line Overview

Our Modbus monitoring solutions span Windows desktop (XPF), Android mobile (Advanced/Console), and Mapper Pro platforms. Each product supports multiple Modbus variants with extensive protocol flexibility.

šŸ—ļø Platform Architecture

Windows XPF Platform

  • Desktop Application

    Modbus Monitor XPF - Professional Windows monitoring and simulation

    • Architecture: .NET Framework 4.8+ (32-bit & 64-bit)
    • OS Support: Windows 10/11 (x86, x64)
    • Deployment: Microsoft Store, Direct Download (Installer/Portable)
    • License Model: Per-user (Microsoft Account) or machine-locked
    • RAM: 4-8GB recommended for large datasets
    • Storage: 100-500MB depending on logs

    XPF User Guide

  • Mobile Platform

    Modbus Monitor Advanced - Android field monitoring

    • Architecture: Android Native (Java/Kotlin)
    • OS Support: Android 6.0+ (API 23+)
    • Deployment: Google Play Store
    • License Model: Per-device Google Play license
    • RAM: 2GB+ recommended
    • Storage: 50-200MB including logs
    • Hardware: USB OTG support for serial, Bluetooth 4.0+

    Android Advanced Guide

šŸ“” Modbus Protocol Support

Supported Protocol Variants

8 Protocol Variants Supported:

Protocol Transport Notes Use Case
Modbus TCP Ethernet Standard port 502 PLCs, SCADA systems, industrial devices
Modbus UDP Ethernet Connectionless variant Low-latency networks, broadcast scenarios
Modbus RTU Serial (RS485/RS232) Binary encoding, CRC-16 Legacy devices, long-distance serial
Modbus ASCII Serial (RS485/RS232) ASCII encoding, LRC checksum Human-readable debugging
RTU over TCP Ethernet RTU packets encapsulated in TCP Serial protocol over network
ASCII over TCP Ethernet ASCII packets encapsulated in TCP Network-based ASCII communication
UDP RTU Ethernet RTU packets over UDP Low-latency RTU over network
UDP ASCII Ethernet ASCII packets over UDP Low-latency ASCII over network

Simultaneous Operation: Client and Server modes run concurrently in one application

8 Protocol/Channel Variants Supported:

Protocol Transport Channel Use Case
Modbus TCP Ethernet TCP/IP (Wi-Fi/Ethernet) Standard network devices
Modbus UDP Ethernet TCP/IP Low-latency mobile networks
Modbus RTU Serial USB OTG, Bluetooth Field devices via USB/Bluetooth adapters
Modbus ASCII Serial USB OTG, Bluetooth Serial debugging and legacy devices
RTU over TCP Ethernet TCP/IP RTU encapsulation over network
ASCII over TCP Ethernet TCP/IP ASCII encapsulation over network
ThingSpeak Cloud HTTP API IoT cloud logging and visualization
Google Sheets Cloud Google API Real-time spreadsheet logging
MQTT IoT TCP/IP (MQTT broker) Industrial IoT messaging

Communication Channels: TCP/IP (Wi-Fi), USB OTG, Bluetooth, Cloud/IoT

Protocol Support:

Protocol Transport Platform Use Case
Modbus RTU Serial Windows (COM), Android (USB/BT) Serial device configuration
Modbus ASCII Serial Windows, Android ASCII-based device setup

Mapper Pro Documentation

Protocol Specifications

Function Code Support:

Function Code Name XPF Android Description
01 Read Coils āœ… āœ… Read discrete outputs (0xxxxx)
02 Read Discrete Inputs āœ… āœ… Read discrete inputs (1xxxxx)
03 Read Holding Registers āœ… āœ… Read output registers (4xxxxx)
04 Read Input Registers āœ… āœ… Read input registers (3xxxxx)
05 Write Single Coil āœ… āœ… Write one discrete output
06 Write Single Register āœ… āœ… Write one holding register
15 Write Multiple Coils āœ… āœ… Write multiple discrete outputs
16 Write Multiple Registers āœ… āœ… Write multiple holding registers
07 Read Exception Status āœ… āŒ Return exception status byte (legacy)
08 Diagnostics āœ… āŒ Loopback, counters, and diagnostic subfunctions
11 Get Comm Event Counter āœ… āŒ Return status counters for serial line
12 Get Comm Event Log āœ… āŒ Return event log for diagnostics
17 Report Slave ID āœ… āŒ Return device identification string
43 Encapsulated Interface Transport āœ… āŒ General MEI (Modbus Encapsulation Interface)
43/14 Read Device Identification āœ… āŒ MEI: Basic/Regular/Extended ID objects
43/15 Read Date and Time āœ… āŒ MEI: Device time read (if supported)
43/16 Write Date and Time āœ… āŒ MEI: Device time write (if supported)

Addressing Conventions:

  • 5-digit format: 00001-09999 (Coils), 10001-19999 (Discrete Inputs), 30001-39999 (Input Registers), 40001-49999 (Holding Registers)
  • 6-digit format: Extended range for modern PLCs (see 6-Digit Addressing Guide)
  • 0-based mode: Direct register addresses (0-65535) for protocol-level access
  • 1-based mode: Traditional PLC addressing (adds 1 to protocol addresses)

Complete Address Reference Guide

šŸ”Œ Hardware & Connectivity

Communication Interfaces

XPF Windows:

  • Native COM Ports: Direct Windows serial port access
  • USB-to-Serial: FTDI, Prolific, CH340 chipsets supported
  • Multi-Drop RS485: Up to 32-247 devices per bus (spec-dependent)
  • Baud Rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps
  • Data Bits: 7, 8
  • Parity: None, Even, Odd, Mark, Space
  • Stop Bits: 1, 1.5, 2
  • Flow Control: None, Hardware (RTS/CTS), Software (XON/XOFF)

Android:

  • USB OTG: FTDI, CP210x, CH34x, PL2303 chipsets via USB OTG cable
  • Bluetooth Serial: SPP (Serial Port Profile) adapters
  • Baud Rates: 9600, 19200, 38400, 57600, 115200 bps (common)
  • Configuration: Configurable parity, stop bits, data bits

USB OTG Cable Required

Android devices need USB OTG adapter cable to connect USB-to-serial converters. Verify device OTG support before purchase.

Network Requirements:

Parameter XPF (Windows) Android Notes
Port 502 (default), custom 502 (default), custom Modbus TCP standard port
IP Addressing Static, DHCP Wi-Fi, Ethernet (via adapter) IPv4 required
Firewall Windows Firewall rules Android app permissions May block port 502
Multi-homing Supported (multiple NICs) Single active connection -
Server Mode Bind to specific IP or all Bind to Wi-Fi interface -

Network Topology:

  • Point-to-Point: Direct device connection
  • Star: Multiple devices via switch/router
  • Routed: Cross-subnet with routing
  • VPN: Secure remote access over internet

Bluetooth (Android Only):

  • SPP Profile: Serial Port Profile for serial adapters
  • Pairing Required: Android Settings ā†’ Bluetooth
  • Range: ~10-30 meters (Class 2 devices)
  • Security: PIN/passkey authentication
  • Adapters: HC-05, HC-06, RN42, commercial BT-serial bridges

Wi-Fi (Android):

  • Standards: 802.11 b/g/n/ac
  • Frequency: 2.4GHz and 5GHz
  • Connection: WPA2/WPA3 encrypted networks
  • IP Assignment: DHCP or static

USB OTG (Android):

  • Chipset Support: FTDI FT232, Silicon Labs CP210x, WCH CH340, Prolific PL2303
  • Power: Self-powered or USB-powered adapters
  • Driver: Automatic detection (no root required)

MQTT Add-on:

  • Brokers: AWS IoT Core, Azure IoT Hub, HiveMQ, Mosquitto, EMQX
  • Transport: TCP (1883), TLS/SSL (8883), WebSockets (80/443)
  • QoS Levels: 0 (At most once), 1 (At least once), 2 (Exactly once)
  • Authentication: Username/password, client certificates (mutual TLS)
  • Topics: Customizable structure with device ID and point names

MQTT Add-on Guide

ThingSpeak Add-on:

  • Protocol: HTTPS REST API
  • Update Rate: 15 seconds minimum (free tier), 1 second (paid)
  • Data Fields: Up to 8 channels per ThingSpeak channel
  • Features: Charts, MATLAB analytics, alerts, public/private channels

ThingSpeak Add-on Guide

Google Sheets Add-on:

  • Protocol: Google Sheets API v4 (OAuth 2.0)
  • Authentication: Google account with drive.file scope
  • Update Rate: 5 seconds recommended (API rate limits)
  • Data Format: Row append with timestamp and device ID

Google Sheets Add-on Guide

USB-to-Serial Adapters (Tested & Verified):

Brand/Model Chipset XPF Android Notes
FTDI TTL-232R-3V3 FT232R āœ… āœ… Gold standard, excellent drivers
Silicon Labs CP2102 CP210x āœ… āœ… Low cost, reliable
WCH CH340G CH340 āœ… āš ļø Cheap, may need manual drivers
Prolific PL2303 PL2303HX āœ… āš ļø Avoid counterfeit versions
StarTech ICUSB232 FTDI āœ… āœ… Industrial-grade isolation

RS485 Adapters:

Model Type Isolation Range Notes
FTDI USB-RS485-WE-1800 USB Yes (2.5kV) 1200m Professional grade
Waveshare USB-RS485 USB No 1200m Budget option
B&B USOPTL4 USB Yes (2.5kV) 1200m Industrial certified

Bluetooth Serial Adapters:

Model Range Baud Rate Notes
HC-05/HC-06 10m Up to 115200 Common, requires 3.3V power
RN42 10-30m Up to 921600 Roving Networks, reliable
Parani SD1000 100m Up to 921600 Industrial, Class 1 power

šŸŽÆ Data Types & Formats

Supported Data Types

Data Type Size (bytes) Range XPF Android Notes
UINT16 2 0 - 65535 āœ… āœ… Unsigned 16-bit integer
INT16 2 -32768 - 32767 āœ… āœ… Signed 16-bit integer
UINT32 4 0 - 4,294,967,295 āœ… āœ… Unsigned 32-bit integer
INT32 4 -2,147,483,648 - 2,147,483,647 āœ… āœ… Signed 32-bit integer
FLOAT32 4 Ā±3.4EĀ±38 (7 digits) āœ… āœ… IEEE 754 single-precision
FLOAT64 8 Ā±1.7EĀ±308 (15 digits) āœ… āœ… IEEE 754 double-precision
STRING Variable ASCII characters āœ… āœ… Multiple registers as text
BIT 1 bit 0 or 1 āœ… āœ… Coils and discrete inputs
UINT64 8 0 - 18,446,744,073,709,551,615 āœ… āœ… Unsigned 64-bit integer
INT64 8 -9,223,372,036,854,775,808 - ... āœ… āœ… Signed 64-bit integer

Byte Order (Endianness)

Byte Swap Options:

Swap Type Description Example (0x12345678) When to Use
None (ABCD) Big-endian words, big-endian bytes 12 34 56 78 Modbus standard, most PLCs
BADC Little-endian words, big-endian bytes 34 12 78 56 Some industrial controllers
CDAB Big-endian words, little-endian bytes 56 78 12 34 Alternate format
DCBA Little-endian words, little-endian bytes 78 56 34 12 Intel x86 format

Word Swap (for 32-bit and larger):

- **High-Low (HL)**: High word first (standard Modbus)
- **Low-High (LH)**: Low word first (alternate devices)

Finding Correct Byte Order

If values appear incorrect, try different byte swap combinations. Most Modbus devices use ABCD (no swap) or BADC format.

Scaling & Transformation

Linear Scaling: 

Scaled Value = (Raw Value Ɨ Multiplier) + Offset

Examples:

Device Raw Range Scaled Range Multiplier Offset Use Case
Temperature Sensor 0-10000 0-100Ā°C 0.01 0 Convert tenths to degrees
Pressure Transmitter 4000-20000 0-100 PSI 0.00625 -25 4-20mA scaled output
Flow Meter 0-65535 0-1000 GPM 0.0153 0 Direct GPM reading

Both XPF and Android support:

- Multiplication factor
- Addition/subtraction offset
- Decimal precision (display rounding)
- Engineering units (text suffix)

šŸ”§ Advanced Features

Client Mode (Master)

Polling Capabilities:

Feature XPF Android Notes
Unlimited Monitor Points āœ… āœ… No practical limit (memory-dependent)
Multi-Device Polling āœ… āœ… Different slave IDs, IPs, COM ports
Mixed Protocols āœ… āœ… TCP + RTU + ASCII simultaneously
Polling Interval 1ms - custom 100ms+ recommended Android: battery-dependent
Write Operations āœ… āœ… Function codes 05, 06, 15, 16
Read-Modify-Write āœ… āœ… Function code 23
Auto-Reconnect āœ… āœ… On timeout or error

Performance: - XPF: Can poll 1000+ points per second on modern hardware - Android: 10-100 points per second typical (network/CPU dependent)

Server Mode (Slave)

Server Capabilities:

Feature XPF Android Notes
Modbus TCP Server āœ… āœ… Responds to client requests
Modbus RTU Server āœ… āŒ XPF only (serial limitation on Android)
Modbus ASCII Server āœ… āŒ XPF only
Multiple Slaves āœ… āŒ XPF: multiple slave IDs per interface
Register Simulation āœ… āœ… Static values or live sensor data
Sensor Publishing (Android) āŒ āœ… Accelerometer, gyro, GPS, etc.
Simultaneous Client+Server āœ… āœ… Run both modes at once

Use Cases:

  • Protocol Gateway: Client reads PLC, Server exposes to SCADA
  • Device Simulator: Test clients without physical hardware
  • Sensor Bridge (Android): Expose phone sensors as Modbus registers
  • Data Aggregator: Combine multiple sources into one Modbus interface

Sensor Server Mode (Android Only)

Published Sensors:

Sensor Type Register Count Update Rate Use Case
Accelerometer 3 (X, Y, Z) 10-100 Hz Vibration monitoring
Gyroscope 3 (X, Y, Z) 10-100 Hz Rotation tracking
Magnetometer 3 (X, Y, Z) 10-50 Hz Compass heading
GPS 5 (Lat, Lon, Alt, Speed, Bearing) 1 Hz Location tracking
Light Sensor 1 1-10 Hz Ambient light
Proximity 1 1-10 Hz Object detection
Pressure 1 1-10 Hz Barometric pressure
Temperature 1 1 Hz Ambient temp

Modbus Mapping:

  • Sensors assigned to sequential holding registers (4xxxxx)
  • FLOAT32 format (2 registers per axis)
  • Automatic updates when sensor values change

Sensor Server Details

šŸ“Š Data Logging & Export

Export Formats

CSV (Comma-Separated Values):

  • XPF: Export monitor points, server data, logs
  • Android: Export monitor points with timestamps
  • Columns: Timestamp, Name, Value, Status, Config
  • Scheduling: Manual, timed intervals (second/minute/hour)

Google Sheets (Android Add-on):

  • Real-time row append to cloud spreadsheet
  • Automatic timestamp and device ID columns
  • OAuth 2.0 authentication
  • 5-second minimum interval recommended

Email Export (Android):

  • Attach CSV to email directly from app
  • Configure recipient, subject, body
  • Triggered manually or on schedule

Logging Capabilities

XPF:

  • Packet Logs: Raw Modbus frames with timestamps
  • Value Logs: Monitor point data over time
  • Server Logs: Client request/response history
  • Scanner Logs: Device discovery results
  • File Formats: CSV, TXT, XML

Android:

  • Statistics: Good/bad packet counts, response times
  • CSV Export: Timestamped value logs
  • Cloud Logging: ThingSpeak, Sheets, MQTT real-time
  • Storage: Internal storage or SD card

šŸ› ļø Troubleshooting Tools

Built-in Diagnostics

XPF:

  • Scanner: Auto-discover device addresses and register maps
  • Packet Viewer: Real-time Modbus frame inspection
  • Error Counters: Track timeouts, exceptions, CRC errors
  • Response Time: Per-point latency measurement
  • Traffic Capture: Record and replay Modbus sessions

Android:

  • Packet Display: View raw TX/RX frames per monitor point
  • Comm Counters: Good/bad packet statistics
  • Response Delay: Per-point timing metrics
  • USB Device List: Detect connected USB serial devices
  • Bluetooth Pairing: In-app BT device discovery

Common Issues & Solutions

Connection Failures:

Symptom Likely Cause Solution
Timeout Wrong IP, device offline Verify network, ping device
No Response Wrong port, firewall Check port 502, firewall rules
CRC Error (RTU) Baud mismatch, noise Verify serial settings, cables
Exception Code Invalid address, function Check device register map
USB Not Detected Driver missing, OTG issue Install drivers, check OTG cable

Performance Issues:

Symptom Cause Solution
Slow Polling Too many points, low interval Increase interval, reduce points
High CPU Fast polling, large datasets Optimize polling strategy
Packet Loss Network congestion Reduce traffic, improve network
Timeout Errors Device slow, network latency Increase timeout values

Full Troubleshooting Guides

šŸ“š Integration & Development

Data Import/Export

Monitor Point Configuration Files:

  • Format: CSV with headers (Name, Address, Type, Channel, Protocol, etc.)
  • XPF: Save/Load configurations for different devices
  • Android: Import/Export from Downloads folder
  • Use Case: Share configurations between devices, backup settings

Third-Party Integration

Compatible Tools:

  • QModMaster: Open-source Modbus master (Linux/Windows)
  • pymodbus: Python Modbus library
  • ModScan: Commercial Windows Modbus scanner
  • Node-RED: Visual IoT flow programming (MQTT integration)
  • Home Assistant: Smart home automation (MQTT integration)
  • Grafana: Visualization dashboards (ThingSpeak, Sheets data sources)

Protocol Compliance:

  • Modbus.org Specification: Fully compliant
  • Function Codes: Standard 01-23 supported
  • Exception Codes: All standard exceptions handled
  • CRC/LRC: Correct checksum implementation

šŸ” Security Considerations

Network Security

XPF:

  • Runs on Windows with OS-level firewall
  • VPN support for remote access
  • No built-in encryption (use VPN or secure network)
  • Authentication: None (Modbus protocol limitation)

Android:

  • App permissions: Network, USB, Bluetooth, Storage
  • Wi-Fi security: WPA2/WPA3 encrypted networks
  • Cloud add-ons: TLS/SSL for MQTT, OAuth 2.0 for Sheets
  • Bluetooth: PIN/passkey pairing

Best Practices:

  • Use VPN for remote Modbus access
  • Isolate Modbus networks from internet (air-gap or VLAN)
  • Enable TLS/SSL for MQTT cloud connections
  • Use strong passwords for cloud services
  • Regularly update app/software
  • Monitor logs for unauthorized access attempts

Data Protection

  • Local Storage: Data stored on device (not cloud by default)
  • Cloud Add-ons: User-controlled (opt-in)
  • Encryption: MQTT TLS, Google API HTTPS, ThingSpeak HTTPS
  • Privacy: No telemetry or analytics without consent

šŸ“– Additional Resources

Documentation

Support Channels

Product Comparison

Feature XPF (Windows) Android Advanced Mapper Pro
Platform Windows 10/11 Android 6.0+ Windows/Android
Client Mode āœ… āœ… āœ…
Server Mode āœ… (TCP/RTU/ASCII) āœ… (TCP only) āŒ
Protocols 8 variants 8 variants + Cloud 3 variants
Simultaneous Client+Server āœ… āœ… āŒ
Serial (RS485/232) āœ… (Native COM) āœ… (USB OTG, BT) āœ…
Ethernet (TCP/IP) āœ… āœ… (Wi-Fi) āœ…
Cloud Integration āŒ āœ… (MQTT, Sheets, ThingSpeak) āŒ
Sensor Publishing āŒ āœ… āŒ
Device Scanner āœ… āŒ āœ…
Price $49.99 $2.99 + Add-ons $149.99

Compare All Products

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