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+# Related Equipment and Cables
+
+The RM-M7G and RCP-TX7 are best understood as part of a Sony SD camera remote
+control ecosystem. Related camera control units and cables often contain the
+pinout, mode, and compatibility details missing from the remote-panel manuals.
+
+## CCA-7 Remote Cable
+
+The CCA-7 family is the 10-pin remote cable used by the RM-M7G and RCP-TX7.
+
+Known cable lengths:
+
+- CCA-7-5.
+- CCA-7-25.
+- CCA-7-50.
+- CCA-7-100.
+
+Sony Japan CCA-7-25 page:
+<https://www.sony.jp/pro/products/CCA-7-25/feature_1.html>
+
+Important details from Sony Japan:
+
+- Connects professional video cameras/camcorders and remote controls.
+- 10-pin female to 10-pin male.
+- Listed compatibility:
+  - DXC-D30/D35/327/537/637 series, CA-325 series, CCU-M5/M7 to RM-M7G.
+  - DXC-D30/D35/D50/D55 series to RCP-TX7/RCP-D50/RCP-D55.
+
+The CCU-TX7 service manual includes a CCA-7 cable wiring diagram. Use that as
+the better source for cable fabrication or continuity checks.
+
+## CCU-TX7 / CCU-TX7P
+
+Primary service manual:
+<https://www.manualslib.com/manual/1068508/Sony-Ccu-Tx7.html>
+
+The CCU-TX7 is directly relevant to RCP-TX7 because the RCP was designed for
+CCU-TX7/TX7P camera systems with CA-TX7/TX7P camera adaptors.
+
+Useful sections in the CCU-TX7 service manual:
+
+- Connector input/output signals.
+- REMOTE connector information.
+- Connection connector list.
+- CCA-7 cable wiring diagram.
+- Board switch functions.
+- Service information and disassembly.
+- Video signal system adjustment.
+- Triax interface system adjustment.
+- Intercom/tally details.
+
+The CCU-TX7 rear panel REMOTE connector is described as a 10-pin connector for
+the RCP-TX7 via a CCA-7 cable.
+
+## CCU-D50 / CCU-D50P
+
+Official operation manual:
+<https://pro.sony/s3/cms-static-content/operation-manual/3620534151.pdf>
+
+Sony Japan product page:
+<https://www.sony.jp/pro/products/CCU-D50/>
+
+The CCU-D50 is useful because it bridges older RM-M7G-style operation and
+RCP-TX7-style operation:
+
+- `M5A mode` supports basic control using RM-M7G.
+- `TX7 mode` supports more detailed camera operation using RCP-TX7.
+
+The official CCU-D50 manual lists RCP-D50/D51, RCP-TX7, and RM-M7G as remote
+control options. It also includes a section on using the RM-M7G remote control
+unit and describes panel active handoff behavior.
+
+The Japanese CCU-D50/CA-D50 catalog notes:
+
+- CCU-D50 can use RM-M7G in M5A mode for basic DXC/DSR control.
+- CCU-D50 can use RCP-TX7 in TX7 mode for broader picture-making controls.
+- RCP-TX7 connector is circular 10-pin.
+- RCP-TX7 power is DC 12 V, 10 V to 17 V range.
+- RCP-TX7 power consumption is 4.0 W.
+
+## DXC-D30 / DXC-D30WS
+
+DXC-D30 user manual mirror:
+<https://manualmachine.com/sony/dxcd30/551509-user-manual/>
+
+This is useful for protocol research because it explicitly says the 10-pin
+remote connector for RM-M7G and RCP-TX7 is designed according to RS-232C, and
+that external PC control is possible with the proper Sony protocol.
+
+System diagrams show:
+
+- RM-M7G connected through CCA-7.
+- RCP-TX7 connected through CCA-7.
+- CCU-M7 / CCU-M5 camera control units.
+- CCU-TX7 / CA-TX7 triax system.
+
+## DXC-327B / DXC-327BP
+
+Official Sony operating instructions PDF:
+<https://pro.sony/s3/cms-static-content/operation-manual/3856085221.pdf>
+
+Useful RM-M7G notes:
+
+- RM-M7G connects with CCA-7-5/25/50/100 camera remote cable.
+- CAMERA SELECT switch on RM-M7G should be set to `1`.
+- Some RM-M7G controls do not affect camera output in this system.
+- Some camera-side switches are disabled while RM-M7G is connected.
+
+## DSR-390 / DSR-570WS Family
+
+ManualMachine mirror:
+<https://manualmachine.com/sony/powerhaddsr570wspl/1203049-user-manual/>
+
+Useful notes:
+
+- Has a 10-pin REMOTE connector for RM-M7G.
+- CAMERA SELECT on RM-M7G should be set to `1`.
+- EZ mode cannot be used while RM-M7G is connected.
+- Power should be off before connecting or disconnecting remote equipment.
+