One of these connectors are required if you need to program or reprogram the flash image in a Driver Controls. I suspect that not all Blades have a Driver Controls, but if yours do, and you need to replace the processor or firmware for some reason, then you'll need this connector installed. A Driver Controls unit from a Blade that Weber and I programmed recently did not have the connector populated. Blade must have used some other method to program the firmware into the Driver Controls; maybe it's possible over the CAN bus or a serial port.
To be clear: to use JTAG to program the flash image in the Driver Controls, you need this connector, and also a .hex file containing the image (attached; the white one is known to be for a Mark VI), an Olimex programmer device, and a suitable computer with drivers and the programming program (it comes with the Olimex programmer). JTAG can also be incredibly useful for debugging firmwares, but you have to know what you are doing.
https://au.element14.com/amphenol-fci/h ... a%2Fsearch [ Edit: if this link doesn't work, it's Element14 part number 183-5837 . ]
