Research Concepts RC4000 - Manual (Page 27)

RC4000 Antenna Controller Chapter 2 Hardware
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2.1.2.2.6 J6 - USB
J6 "none" 5 pin Type 7
USB mini-B upstream receptacle
-- any handling (don’t plug in with 4k on etc.) warnings ------
The update procedure is as follows:
1) Power off ACU. Connect USB cable between ACU and PC.
2) Power on ACU, wait for USB drive to be created on PC.
3) Drag hex file (attached) to USB drive. Wait for file to copy over.
4) Power off ACU. Disconnect USB cable between ACU and PC.
5) Power on ACU. New software can be identified by BN#3.