Epson PLQ-20 Reference Manual page 84

DSR (PR2)
When you select On, DSR (Data Set Ready) is activated.
This option is available only in the PR2 mode.
DCD (PR2)
When you select On, DCD (Data Carrier Detector) is activated.
This option is available only in the PR2 mode.
Passbook
When you use single sheet or passbook, set this option to On.
When you use multipart forms, set this option to Off.
Binding
You need to set the method for binding when you use a passbook.
Select Horizontal for a horizontal-fold passbook or Vertical for a
vertical-fold passbook.
Thin paper
When you use thin paper, set this option to On. This mode is
activated when you select On and the Passbook mode is set to
Off.
Buzzer
If you set this feature to On, the printer beeps when an error
occurs. See "Using the error indicators" on page 99 for more
information on printer errors. If you do not want the printer to
beep, select Off.
Chapter 5 Control Panel 84