Operation
PCD7.D250
Page 5-8
SAIA-Burgess Electronics Ltd.
(D25-05-E.DOC)
26/770 E1
For example, if “A” is pressed, with “All keys, 2 speed” auto-repeat, this
is the sequence of events:
Time (secs.)
0
0,7
3
n
Code sent:
A
AAAAA . . . . . AAAA 30AA . . . AA31
Character mode 8 x 40 (4 x 20 off) or 4 x 20
[8 x 40]
In Setup it is only possible to choose either 8 x 40 (default) or 4 x 20.
Superposition of both modes is possible using the controller via the serial
port (see section 6.2).
Character set
[CodePage 437]
In 8 x 40 or 4 x 20 mode, two character sets each are available. Each set
uses the same characters for 32 to 127 dec. There are differences in
subsequent characters 128 to 255 dec. (see tables in Chapter 7).
Backlight
[On]
The display’s LED backlight can be turned off if required. The backlight
is normally always on, and is required to make the text visible. The
backlight is usually only turned off and on (blinked) to provide a visual
indication of an alarm etc. using escape sequences sent by the host (see
section 6.3).
Contrast
[7]
The contrast of the LCD display (it’s blackness) can be adjusted in 16
steps by selecting a value between 0 and 15. 0 is the lightest, 15 is the
darkest.
Communications channel
[COM1]
COM 1 has RS
232 as fixed equipment. Alternatively, COM 0 can be
fitted with the PCD7.F2.. modules. It is not possible to run both channels
simultaneously.
Key released, sends 31 decimal.
Start second speed mode after 3 secs, sends 30
decimal, “A” still repeats at 8 per second.
Start repeat at 8 per sec.
“A” key pressed, single A sent.
