In meter inspection work, a common headache for field engineers is that different brands and models of meters use completely different communication protocols. Some meters use the IEC 62056-21 standard, some use ANSI C12.18, while domestic meters generally follow the DL/T-645 protocol. If an inspection device only supports one or two of these protocols, engineers must carry multiple different optical probes in their tool kits, or waste time returning for the correct device when a protocol mismatch is discovered on site — severely impacting efficiency. Tespro's Bluetooth optical probe fundamentally solves this problem by pre‑loading multiple mainstream protocol stacks. It natively supports IEC 62056‑21 Mode C and Mode E, ANSI C12.18 and its 2006 Type‑2 version, as well as DL/T‑645 , while also being compatible with user‑defined transparent transfer modes — one device covers most field meter types.
The value of this multi‑protocol compatibility in real work scenarios is self‑evident. Consider a typical industrial park inspection task: the park may have imported Landis+Gyr meters, domestic meters, and water and heat meters of various brands. The traditional approach requires carrying at least three different reading devices, each with its own operation method, requiring engineers to remember different button sequences and connection procedures. With Tespro's Bluetooth optical probe, engineers simply select the corresponding meter brand and protocol type in the companion mobile app or collection software, and the device automatically reads data according to the correct communication protocol. The process is simple and intuitive — even new inspection staff can get up to speed within minutes. For factory facility management teams and third‑party inspection service providers responsible for multiple meter types, this one‑device‑fits‑many capability means lower equipment procurement costs, simpler tool management, and more efficient field operations.
Which communication protocols does the Tespro Bluetooth optical probe support? Can it work with domestic DL/T‑645 protocol meters?
The Tespro Bluetooth optical probe supports IEC 62056‑21 (Mode C/E), ANSI C12.18, DL/T‑645 , and user‑defined transparent transfer modes. It is fully compatible with domestic DL/T‑645 protocol meters, including smart meters from major brands such as Wasion, Linyang, Samsung, and Huali.
Beyond mainstream standardized protocols, the Tespro Bluetooth optical probe also offers flexible user‑defined transparent transfer mode. When encountering custom meters using non‑standard protocols, engineers can use transparent transfer mode to send and receive raw commands directly without requiring the device to parse or convert protocols. This is an important fallback capability for maintaining legacy meters or interfacing with certain specialized equipment. With a maximum communication rate of 115,200 bps and a maximum frame length of 2048 bytes, the Tespro Bluetooth optical probe can handle everything from simple single readings to complex load curve data collection. The product also supports firmware upgrades via USB — when new meter protocol standards emerge, users can gain support through software updates without hardware replacement. For long‑term metering projects, this expandability means the device will not become obsolete as protocol standards evolve, providing better investment protection.
