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XCom determines if a message is correct when it receives a message based on the messages defined through the Configuration Tool.
If a message is received but has an Unrecognized Device ID, S9F1
If a message is received but has an Unrecognized Stream Type, S9F3
If a message is received with an Unrecognized Function Type, S9F5
If a message is received and the message contains illegal data, XCom automatically sends the message S9F7
.

However, the Stream 9 Automatic reply function in the Configuration Tool must be set to True.

How to set up
1) Run XCom Configuration tool.
2) Select the Configuration tab.
3) Change SML Syntax Check value to false.
4) Stream 9 Automatic Error Reply setting value set to true (S9F1, S9F3, S9F5, S9F7)
5) Save XCom Configuration file.

If SML Syntax Check is set to false and Automatic reply is set to true,
Communication error messages will be sent automatically.
S9F1 Automatic reply (true): S9F1 Send messages automatically.
S9F3 Automatic reply (true): Send S9F3 message automatically.
S9F5 Automatic reply (true): Send S9F5 message automatically.
S9F7 Automatic reply (true): Send S9F7 message automatically.