InLink-HM is a complete HART modem module that can be used as a primary or secondary HART host - eliminating the need for external carrier detect (CD) monitoring and request-to-send (RTS) control. It can also be configured to continuously poll up to 16 HART devices, filling internal Modbus registers with variable values. The variable values can then be read as 16-bit signed integer or single precision floating point using Modbus-RTU commands. Configuration is saved in Modbus registers allowing Modbus commands to be used for configuration. InLink-HM uses the same modem and core processor that the MicroLink-HM modems use.