Reader Product Protocol Documents
Published 2026-09-08
中Protocol documents for reader / scanner products: MC51 network interface protocol, QR scanner communication protocols (v3.3 / v2.10 / v2.8), RS485 multi-drop protocol and the network device interface specification - pick the version that fits your device and integration.
This page collects all communication protocol documents for Vguang reader / scanner products - download the version that fits your device model and integration approach.
MC51 Network Interface Protocol v1.5
For the MC51 scanner (WIFI / Ethernet / 4G): as a client it reports decode results (vgdecoderesult) to a server via HTTP/HTTPS POST or TCP/IP and receives the reply (code).
QR Scanner Communication Protocols (serial)
Cover control commands, result reporting, whitelist and NFC operations over Ethernet TCP / WIFI TCP / 485 / 232 / TTL. v3.3 is the latest (adds heartbeat, whitelist operations and source-distinguished reporting); v2.10 adds the scan on/off command on top of v2.8 - pick per legacy project needs.
Vguang RS485 Multi-Drop Protocol v0.6
Bus protocol for multiple readers (device address 1-255) on a single RS485 bus: SN / ID setup, data acquisition and control, system parameters (TLV), M1 card read/write, CPU card COS commands and Bluetooth pass-through.
Vguang Network Device Interface Specification v1.2
Base interface spec for a QR scanner (WIFI / Ethernet) acting as a client that reports data to a server and processes the reply (code), via HTTP POST or TCP/IP.
Selection notes
Use the latest version of each protocol for new projects; refer to the PDF for exact command formats and checksums.
SDK Downloads
FAQ
Which scenario does each protocol fit?
The MC51 network interface protocol and the network device interface specification are for network reporting (HTTP/TCP) from a scanner to a server; the QR scanner communication protocols are for secondary development over TCP / 485 / 232 / TTL; the RS485 multi-drop protocol is for networking multiple readers on a single RS485 bus.
Which version is the latest?
QR scanner communication protocol v3.3 is the latest - use it for new projects; v2.10 / v2.8 are legacy versions still fine for existing devices.
What language are the protocol PDFs in?
The protocol PDFs are currently in Chinese, with the page description available in Chinese and English; contact us for an English version.