How to send soft break through serial comm

[irb4]

So I am using evb 2002 sending hex commands to control this radio modem through RS232.

Something like this:
MSComm1.Output = Chr$(&HF8) & Chr$(&H0) & Chr$(&H1) & Chr$(&H96) & Chr$(&H0) & Chr$(&H0)

Now the manual of the radio modem ask me to send "soft break" ....now what's that suppose to mean? How to send it to the serial comm using evb?