The peak program meter behavior in DHD systems is configured via the "Level Detection" settings in Toolbox4/Toolbox5. To emulate an analog PPM (DIN 45406 / IEC 268-10 Type I), set Attack to 2ms and Release to 0.7s; for a digital PPM, use Attack 0ms (or 1ms if integration time is needed) and the same Release of 0.7s.

When using the delay option on an RM2200D equipped with an RM220-951 Controller, the number of delay channels must be configured in the software and should match or exceed the number of connected fader strips. For up to 8 faders configure 8 delay channels; for 12 faders configure 16; for 16 faders configure 16.

The DHD Communication Server (DHDCS) manages all communication between DHD devices and PC applications, and is bundled with software like Toolbox5, Toolbox4, and several RM420 tools — automatically extracting and launching when needed. For correct operation, the logged-in Windows user requires administrative rights; non-admin setups require a manual one-time DHDCS.exe binding to a dedicated folder with full user access rights granted. Running DHDCS without admin rights is possible since version 1.90.13 but not recommended, as it disables Ping messaging and can cause TCP/IP connection issues.

The DHDCS intentionally does not save filter settings between sessions — after every restart, all filters are reset to deselected. This is a deliberate security measure to prevent important error messages from being permanently suppressed.

The faders on RM420-020MW and RM420-029MW modules require calibration, which DHD performs during manufacturing — recalibration is especially necessary when swapping from plastic to metal faders (Penny & Giles PGFM8100 to PGFM3200). The process is done via Toolbox4's maintenance window using a CAN Block command that includes the processor module's serial number converted to hexadecimal (e.g. decimal 12783 → hex 31EF → command 01ED31EF,5).

Upgrading an RM4200D to the Series 52 firmware generation requires replacing the RM420-850 Communication Controller with an RM420-852 or RM420-853 module. If the console includes a TFT display, the wiring to the controller must be redone according to the new connection scheme — detailed wiring information is available in the 52/MX Manual and Installation Guide.

Not all fiber-optic cables are compatible with DHD MADI modules — suitability depends on the specific module. The linked PDF lists all compatible fiber-optic cable types and maps them to the individual MADI modules they can be used with.

The RM420-015B replaces the RM420-015 and is automatically substituted in all orders, with the only difference being its power supply — it uses Power over Ethernet (PSA16U480POE) instead of a 48V socket. Ordering a 52-4015A, 52-3015A, and PSA16U480POE together yields the equivalent hardware kit.

DHD software such as Toolbox4/4.5 may not run correctly on Windows 7 without adjustments — setting the compatibility mode to Windows XP (Service Pack 3) and enabling "Run as administrator" in the program's properties typically resolves this. As a fallback, Windows XP Mode (available for Windows 7 Professional and Ultimate) may also be used.