These two octets are interpreted bit-by-bit and describe individual values for configuring the handshake procedure. Bit 0 corresponds to the LSB. Octet Bit Name Description 1 0,1,6,7 not used 2 inxfilter 1: enable xon/xoff filter while receiving 3 outxfilter 1: enable xon/xoff filter while sending 4 rts-default 1: while RTS is not used, RTS is active 5 dtr-default 1: while DTR is not used, DTR is active 2 0 rts-disable 1: RTS will not change at LOCK/UNLOCK 1 dtr-disable 1: DTR will not change at LOCK/UNLOCK 2 outx 1: enable software handshake while sending 3 inx 1: enable software handshake while receiving 4 outx-cts 1: enable hardware handshake on CTS 5 outx-dsr 1: enable hardware handshake on DSR 6 inx-dtr 1: enable hardware handshake on DTR 7 inx-rts 1: enable hardware handshake on RTS Standard default settings: OCTET 1 OCTET 2 Function 30h 03h No Handshake 00h 91h Hardware Handshake 3Ch 0Fh Software Handshake (Send/Receive Filter ON)