Remote Processing RPC-330 - Manual (Page 31)

DISPLAY PORT SECTION 8
Page 8-1 RPC-330
Figure 8-1 Display interface
INTRODUCTION
RPBASIC-52 and the RP C-330 interface to a variety of
displays:
VF (vacuum florescent) character
LCD (liquid crystal) character
LCD gr aphics
Character display sizes range from four lines by 20
characters to four lines by 40 characters. The graphics
display supports 160 x 128 pixels. Remote Processing
supplies these displays with appropr iate cables. A
contrast a djustment fo r LC D char acter disp lays is built
into the card.
If a display is not used, this port may be used for general
purpose digital I/O. P ort A and part of port B from an
82C55 are available. See DISPLAY CO NNECTO R PIN
OUT below for ava ilable lines.
The cable length to a display depends upon the amount
of current it requires. A significant amount of voltage
drop occurs with a long cable. V acuum florescent and
LCD graphics cables should b e less than 2 fee t. A
charac ter LC D display c able should be less than 5 feet.
CONNECTING DISPLAYS
The display port is designed to supply all the lines
necessar y for V F and L CD displays. A custom cable
connects the RPC-330 to the display.
Displays purchased from Remote Processing include a
cable. You simply connect the 20 pin connector to the
RPC-330 L CD display port and the other end into the
display.
A d d it io n al po w e r w i r in g is u su a ll y r e q ui r ed f or L C D
graphic and VF charac ter displays. This infor mation is
included with the display. Information content is display
dependent. Below is general information on both.
Graphic displays require additional voltages not
generated on the RPC-330. These must be supplied
externally. An external contrast adjustment is necessary.
Connect these through screw term inal block P5.
VF char acter displays require + 5 volts and ground to be
brought to connector P5. This may in the form of
external wires from the m ain power connector on the
board.
Additional information for commands m entioned in the
following text may be found in the RPBASIC-52
Softwar e Supplem ent in this man ual.
WRITING TO THE DISPLAY
The display type must first be set using the CON FIG
DISPLAY command. T he DISPLAY com mand is used
to print information.
PROGRAMMING EXAMPLE
The example below is for a four line by 20 character
LCD display. Even though DISPL AY statements do not
end with a comma (, ), a < cr> < lf> sequence is not
sent. Use C R to force a return to the beginning of the
line. A CR does not scroll characters on a display. You
must position the cursor to the next line.
10 CONFIG DISPLAY 1
20 STRING 200,30
30 $(0) = "Hello world"
40 DISPLAY (1,2),$(0)
DISPLAY TYPES
RPBASIC-52' s software driver is based upon the
characteristics of a 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 VF 4 x 20
Optrex DMF 682N LCD 160W x 128D