The Parameter Memory is the last part of the Memory Map. In this memory segment, up-to-date data is stored to control the functions of the RM4200D. Among these are e.g. parameters like filter settings, bus assignments and fader values. The audio system accesses these values permanently to control the signal processing in the DSPs respectively. The control system of the RM4200D writes data into the Parameter Memory, if the user modifies settings at the console or using DHD software on a PC. Therefore, the contents of the Parameter Memory changes permanently, in contrast to the data in the setup that do not change after storing it.

Figure 58: The Parameter Memory is the last layer in the Memory Map.

For this reason, the memory segment for the parameter Memory is not located in the flash memory, but in the so called SRAM (Static Random Access Memory). This kind of memory loses the data, as soon as it is cut off operating voltage. Therefore, in the RM4200D, the SRAM is supported by a high capacity capacitor (“Goldcap”). This can retain the content of the Parameter Memory for up to one week. Thus, you can interrupt working at the RM4200D, switch it off and continue your work later, without having to save the current state in a Mixer Setup.

Tip

When switching it on, the RM4200D measures the voltage at the capacitor to check whether the data is still valid. If the voltage is higher than 2,7 V, the data is correct. If the voltage ist lower, the data in the parameter memory is discarded and the Setup 0 is loaded instead. You can read out the voltage at the capacitor, if you use the Maintenance Window of the Toolbox4 software to have the information of the Communications Controller RM420-850 displayed. The value VRAM displayes the current voltage at the goldcap, the value VRAMPon displays the value when switching on the device. VRAMPon must be higher than 2,7 V to have the content of the Parameter Memory accepted as valid.

Like the memory segment for Setups, also the Parameter Memory is only available on the Communications Controller RM420-850.

Figure 59: The single segments of the Memory Map and their storage locations.

Thus, the following segments of the Meory Map are located on all microcontrollers, i.e. also in the Communications Controller RM420-850:

In addition, the following segments are contained on the Communication Controller RM420-850 only:

	Important
	If you have to replace the Communications Controller RM420-850, make sure to save the Setups stored on it to the PC first. To do this, use the Setup Manager software. You can than copy this backup back into the replacement module, thus having the presets available again.