Technical specification of the InHand IHDMP protocol for configuring, monitoring and managing DTU devices via serial port.
The IHDMP (InHand DTU Management Protocol) specification describes how user equipment can configure, monitor and control InHand wireless data terminals (DTU) through a serial interface. It defines the data format, byte order, packet structure, TLV encoding and a set of command words for operations such as probing, login, reboot, SMS handling and status queries.
The document also provides detailed tag definitions for configuration and status items, flow diagrams for typical procedures, and appendices with CRC16 source code and tag tables. It is intended for developers and integrators who need to implement communication with InHand DTU devices. This manual is written in Chinese.