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4x20 Serial LCD with Terminal Features,
Big-character Mode,
Inverse Color Backlight |  |  |
BPP-420VY and BPP-420VR are identical in most respects to our standard BPP-420L. What makes these displays different is their inverse-mode LCD (light pixels on a dark background) and choice of backlight colors (yellow for BPP-420VY and red for BPP-420VR).
Features shared with BPP-420L:
- 2400/9600 baud serial input with 64-byte buffer
- Output for a piezo buzzer that responds to the ASCII bell character
- Large-character mode automatically generates 4-line-tall symbols (0-9 and A-Z)
- Automatic right-alignment features for easy spreadsheet-style formatting of frequently updated data fields
Differences from BPP-420L:
- Inverse LCD prints light pixels on dark background
- Backlight wired ON (serial ON command increases brightness)
- Higher current draw for backlight (required for inverse mode LCD)
- Slight differences in non-critical physical dimensions (see below)
Dimensional Data
| A |
y offset edge to hole center (top & bottom) |
2.50 |
| B |
y pcb height |
60.00 |
| C |
y hole spacing (inside pair) |
55.00 |
| D |
y screen opening |
25.20 |
| E |
y character size |
4.75 |
| F |
x character size |
2.95 |
| G |
x offset pcb edge to hole center |
2.50 |
| H |
x screen frame |
98.00 |
| I |
x screen opening |
77.00 |
| J |
x hole spacing |
93.00 |
| K |
x pcb width |
98.00 |
| L |
y frame height |
39.30 |
| - |
mounting hole diameter |
2.50 |
| - |
frame depth |
9.00 |
- All dimensions in millimeters
- Tolerance is +/- 0.50mm
- Maximum depth (front of screen to highest point on pcb) is 26mm
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Highlighted items differ slightly from BPP-420L
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Basic Specifications
| Power requirements |
4.8 to 5.5Vdc @ 100 mA max (backlight wired on*) |
| User connector |
5-pin header; 0.025" posts on 0.10" centers |
| Serial Input |
RS-232 or inverted TTL, 2400/9600, N81 |
| Buffer depth |
64 bytes |
| Operating Temperature |
0° to 50° C |
| Storage Temperature |
-10° to 60° C |
| LCD type |
Supertwist (STN), inverse mode, blue background |
| Optimum viewing direction |
6 o'clock |
| *Note: Inverse mode requires backlight on full-time. Backlight-on command sets backlight to higher brightness. |
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Control Characters by Function
| ASCII Value |
Control Code |
ASCII Name |
Function |
| 0 |
ctrl-@ |
NUL |
Null; ignored prior to buffer |
| 1 |
ctrl-A |
SOH |
Send cursor home (position 0, upper left corner) |
| 2 |
ctrl-B |
STX |
Begin big-character mode |
| 3 |
ctrl-C |
ETX |
End big-character mode |
| 4 |
ctrl-D |
ETO |
Hide cursor |
| 5 |
ctrl-E |
ENQ |
Show underline cursor |
| 6 |
ctrl-F |
ACK |
Show blinking-block cursor |
| 7 |
ctrl-G |
BEL |
Pulse piezo buzzer output |
| 8 |
ctrl-H |
BS |
Backspace |
| 9 |
ctrl-I |
HTAB |
Tab to next multiple-of-4 column |
| 10 |
ctrl-J |
LF |
Smart linefeed; move down one row |
| 11 |
ctrl-K |
VTAB |
Vertical tab; move up one row |
| 12 |
ctrl-L |
FF |
Formfeed; clear the screen |
| 13 |
ctrl-M |
CR |
Carriage return; move to beginning of next line |
| 14 |
ctrl-N |
SO |
backlight ON/high* |
| 15 |
ctrl-O |
SI |
backlight ON/low* |
| 16 |
ctrl-P |
DLE |
Accept cursor-position data |
| 17 |
ctrl-Q |
DC1 |
Clear 4-line-tall column |
| 18 |
ctrl-R |
DC2 |
Accept right-alignment data |
| 19-26 |
- |
- |
All ignored |
| 27 |
ctrl-[ |
ESC |
Escape; begin multipart instruction (below) |
- Define custom character: ESC D n B0 B1 B2 B3 B4 B5 B6 B7 where n is the character number (0-7) and B0 - B7 are bytes mapping the pixels.
- Restore factory custom character set (used for ctrl-B large-characters): ESC E 1.
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Highlighted items differ from BPP-420L.
*Backlight default is ON/low. Ctrl-N command (backlight-ON for BPP-420L model) sets backlight ON/high. |
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Links for Additional Information
- Check pricing
- Brief data sheet (Acrobat PDF format, ~58kB)
- User manual (Acrobat PDF format, ~132kB)
- Note: Data sheet and manual are for main BPP-420L product line. They do not reflect the slight variations in minor dimensions and backlight operation noted above.
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