|DS3-7||Stop Bits||1bit||2bit
|-
|DS3-8||Handshake Bit0||colspan=2 rowspan=2|0=Hardware (printer sends RTS),<br>1=Software (Printer printer sends XON/XOFF),<br> 2=Software (Computer computer sends ETX, printer responds by ACK),<br>3=Reserved)
|-
|DS3-9||Handshake Bit1