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Texas Instruments MSP-FET430P140 Flash Emulation Tool User's Guide:
The FET tool has a VCC sense feature, that, if used, requires an alternate connection (pin 4 instead of pin 2). The FET VCC- sense feature senses the local VCC (present on the target board, i.e. a battery or other ‚local power supply) and adjusts its signals accordingly.
If the target board is to be powered by a local VCC, then the connection to pin 4 on the JTAG should be made, and not the connection to pin 2. This utilizes the VCC- sense feature of the FET tool and prevents any contention that might occur if the local on-board VCC were connected to the VCC supplied from the FET Interface Module.
If the VCC- sense feature is not necessary (i.e. the target board is to be powered from the FET tool) the VCC connection is made to pin 2 on the JTAG header and no connection is made to pin 4.
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