HOLDx Registers

HOLDx Registers are Modbus Holding Registers available for use in your application. They can be accessed (read and written) by both the Modbus Master and the Microcontroller. The access can be individually or in block. Each register is 16 bits long and they are volatile RAM.

If your product is a sensor, these registers are typically written by the Microcontroller with sensed data, such as pressure, temperature, or humidity, and read by the Modbus Master.

If the product is an actuator, these registers are usually written by the Modbus Master with control data, such as relay states (on/off), motor speed, or solenoid valve positions, and read by the Microcontroller.

These registers can also serve as a bidirectional data exchange point, allowing both the Modbus Master and the Microcontroller to read and write data.