TS-4100 console
From embeddedTS Manuals
The TS-4100 offers two options for interfacing with the console UART. A TTL interface present on the TS-SOCKET headers, or a direct USB serial interface via the micro USB B port labeled "P2". This USB serial interface is provided by the on-board supervisory microcontroller which behaves as a USB serial device. Either port can safely be used without causing any issues or data corruption; the RX path to the CPU is gated to prevent drive conflicts on either source.