Remote Processing RPC-30 - Manual (Page 30)

DISPLAY PORT CHAPTER 8
Page 28 RPC-30
DISPLAY TYPES
CAM BASIC assumes there is a controller on the display.
Its software driver is based upon the characteristics of
the display family. Compatible VF and LCD displays
are shown below:
Manu fact. Model Type
Optrex DMC 40457 LCD 4 x 40
Optrex DMC 40202 LCD 2 x 40
IEEE 3601-90-080 DF 4 x 20
Optrex DMF 5003N LCD 160 x 128
DISPLAY CONNECTOR PINOUT - J4
The displa y port uses an 82C5 5 for data and contr ol.
The table below lists a pin number and its intended
function. A display may not use all lines even though
they are available.
J4 8255 Function
Pin Port/line
1 Logic + 5V
2 Digital ground
3 A / 4 D 4
4 Contr ast
5 A / 6 D 6
6 A / 5 D 5
7 B/4 Reset
8 B/3 Write
9 B/2 Read
10 A / 7 D 7
11 A / 1 D 1
12 A / 0 D 0
13 A / 3 D 3
14 A / 2 D 2
15 B/7 C S
16 B/6 Com mand/ data
17 B/5 Halt
18 Ext. contrast
19 Alternate power
20 Power gr ound
The con trast adjustm ent (J4-4) pr ovides a var iable
voltage from + 5 to -7 VDC. External contrast (J4-18)
is an external voltage re quired for gr aphics displays.
J4 is available for additional I/O if a display
is not used. Port A m ay be configured as an input or
output. Port B must be configured as an output if a 17
key or larger keypad is used.
The addr ess for port A is 80; port B is 81. Use
CON FIG PIO to c onfigure the port.
COMMANDS
The following CAM BASIC comm ands are used for the
display.
Comm and Function
CONFIG DISPLAY Specifies the display type
to use. Use & 50 for the
address.
DISPLAY Prints the string at the
row and collum specified.
T h e fo ll ow i ng c om m a n ds a re a pp li c ab le to th e L C D -
5003 graphics display.
D I S PL A Y L I N E Draws a line.
DISPLAY P Prints a dot to the screen.
D I SP L A Y [O N ] [O F F ] Turns on graphics and
character displays.
CLEAR DISPLAY Clears graphics and/ or
character display.
See the DISP LAY comma nd for mor e variations.