Table of Contents
Advertisement
However, if the DSC option is used (jumper E10 to Ell), then
a LF, VT, FF, or CR code (octal 012, 013, 014, and 015 re-
spectively) may be loaded into the shift register.
(8)
PMSOL goes low - This occurs while the paper movement solenoid
is activated.
(9)
FAULT goes high - This occurs:
(a) if the printer is de-
selected (SLCT ' is low), or (b) if the printer is out of paper
(PE
is low), or (c) during a paper time-out condition, or (d)
during a Light Detect (LD) error condition. LD goes low if
no video signal is detected as the print head travels across
the page.
(10) DLYLF goes high - This 60-90 millisecond line feed delay occurs
following a paper movement operation.
As shown in the timing diagram in Figure 4-4, BUSY can occur up
to 1.5 usec following the trailing edge of DATA STROBE. The worst case
(1.5 usec) condition arises when CSBSY goes active. This occurs because
of the accumulated delays in loading the 80th character in the shift
register, detecting the dummy character at the output, generating. the
CSBSY on LSI chips ME16 and finally generating the
BUSV
on LSI chip ME25.
4.4.3 FUNCTION DECODER
The buffered data inputs are applied to a function decoder on
LSI chip ME25. These data lines gated with a data strobe signal are de-
coded and if a control code is detected, the following actions occur:
Octal
Output
Function
Code
Jumpers
Strobe
Mnemonic
Printer Action
Bell
007
None
Gated
BELL
Generates an audible tone,
(optional)
1 to 2 seconds in duration,
in the speaker at the front
of
th~
printer.
4-10
Advertisement
Table of Contents
