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About the signal GND of RS232C and the board GND

Category: Hardware
Product Number: LTC201A

Hello expert,

Our customer switches the board-to-board connection (RS232C)
by controlling the LTC201AC on the control board.
*Please refer to the attached file.

XLSX

 Please let me ask you a question.

 The LTC201AC is used with the GND of the control board and the signal
 ground(5 pin) of each DSUB connector unconnected.
 Does the LTC201AC work properly in this situation?
    I am concerned that the LTC201AC may be damaged by overvoltage or
    other problems due to differences in ground levels from other boards.

    Please lend me your expertise.

Sincerely,
Tsuyoshi Tokumoto