Reserved characters
The following characters cannot be used freely in the context of the OPC client, where they are subject to certain restrictions:
":"
Separates the EUHigh and EULow limit figures from the ItemID. However, this restriction only applies to CALL-R items in CALL-R servers.
"."
For CALL-R servers, separates the interface name from the ItemID. This restriction similarly only applies to CALL-R items in CALL-R servers.