Seco COMe-C55-CT6 User Manual page 43

Com express type 6 module with the intel 8 th generation core and celeron 4000 cpus

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3.2.5.13 UART interface signals

According to COM Express

Rel. 3.0 specifications, since the COMe-C55-CT6 is a Type 6 module, it can offer two UART interfaces, which are directly managed by

the embedded controller.

Here following the signals related to UART interface:

SER0_TX: UART Interface #0, Serial data Transmit (output) line, 3.3V_RUN electrical level.

SER0_RX: UART Interface #0, Serial data Receive (input) line, 3.3V_RUN electrical level.

SER1_TX: UART Interface #1, Serial data Transmit (output) line, 3.3V_RUN electrical level.

SER1_RX: UART Interface #1, Serial data Receive (input) line, 3.3V_RUN electrical level.

In COM Express

specifications prior to Rel. 2.0, the pins dedicated to these two UART interfaces were dedicated to +12V

to the module, in case it is inserted in carrier board not designed for Type 6, then Schottky-diodes have been added on UART interfaces

they are +12V Tolerant.

Please consider that interface is at TTL electrical level; therefore, please evaluate well the typical scenario of application. If it is not explicitly necessary to interface

directly at TTL level, for connection to standard serial ports commonly available (like those offered by common PCs, for example) it is mandatory to include an RS-

232 transceiver on the carrier board.

The schematic on the next page shows an example of implementation of RS-232 transceiver for the Carrier board.

COMe-C55-CT6

power rail. In order to prevent damages

TX and RX lines so that

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