Internet Direct (Indy) Version 9.0.2 Beta
TIdTCPConnection.ASCIIFilter
Converts incoming characters to the US-ASCII character set.

property ASCIIFilter: boolean;
Description
ASCIIFilter is a Boolean property that indicates all data received by the connection should clear the high bit before storing the value in the Indy read buffer.

ASCIIFilter is used to insure that character data in the Indy buffer will contain values that can be represented using the US-ASCII character set (Decimal 0 through Decimal 127).