Westermo ED-10 TCP - Manual (Page 9)

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CH1: RS-422/485
Screw terminal
CH1: RS-232 D-sub
Power screw terminal
CH2: RS-232 D-sub
configuration only
Network
RJ-45 connection
5.2 Connections
CH1 is used for the serial/network conversion.
Type of interface (RS-232 or RS-422/485) connected
must also be set at DIP switch S1. (Ref. section 4.2)
CH2 is used for local configuration.
CH1 and CH2 are not galvanic isolated.
Please use a RS-232 isolator (e.g.Westermo MD-52) if earth voltage differences are
suspected. An isolator, on permanently connected CH2, is required to maintain the
enhanced transient/surge protection.