_DEVICE_ENABLED WORD 16#4 Only valid
MemGetCurrentHeapSize (Function) SysMemIsValid
valid session
-char> ::= All valid
_READ_BUSPARAMETER USINT 24 FMB_VALIDATE
if the handle is valid h
results are valid
PrevRecord is not a valid handle
bValid BOOL TRUE
Server (FunctionBlock) IsComPortValid