Chapter 8 Logic Instructions
8-259
Case 1： When Enable changes from FALSE to TRUE, Open changes to FALSE, Valid changes to
TRUE and LinkOpened changes to FALSE.
Case 2： As Enable changes from FALSE to TRUE, Valid changes to TRUE. In this case, LinkOpened
changes to TRUE as Open changes from FALSE to TRUE. When Enable changes from TRUE
to FALSE, Valid and LinkOpened change to FALSE.
Case 3： As Open is TRUE and Enable changes from FALSE to TRUE, Valid and LinkOpened change
to TRUE. As Open changes to FALSE, LinkOpened changes to FALSE.
Function
RS232_Link_Manage is used to enable or disable the RS232 communication. The firmware of V1.01
and above supports the function.
1. The input Enable is used to control the instruction to take effect or not. When Enable changes to
FALSE, the operation of other parameters of the instruction will be invalid. When Enable changes
to TRUE, the instruction takes effect and then the operation of other parameter of the instruction
will be valid.
2. In the case that Enable is TRUE, the RS232 communication is switched on as Open changes to
TRUE. The RS232 communication is switched off as Open is FALSE.
3. Before the RS232 communication function is switched on, the parameters of the
RS232_Link_Config instruction must have been configured.
Otherwise, the configured parameters will be not effective if the RS232 function is switched on
before the parameters of the RS232_Link_Config instruction are configured, unless the RS232
communication function is re-switched on.
4. After multiple LinkNum parameters are configured through RS232_Link_Config instructions, only
one RS232_Link_Manage instruction is enough to switch on the RS232 communication function.
And all configurations specified by RS232_Link_Config instructions are for the exchange data with
the slave.
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