User’s Manual
Scott Edwards Electronics, Inc.
1939 S. Frontage Road, Suite F, Sierra Vista, AZ 85635 USA
ph: 520-459-4802 • fax: 520-459-0623 • www.seetron.com
BPP-420 • v4.0 • 7/99 • pg 10
Table 2. Basic
Specifications
Figure 6. Physical dimensions
A
B
C
D
L
G
I
J
H, K
E
F
Dimensions and Specifications
Truly is our primary supplier of 4x20 LCD modules used in this product, but we also use DataVision
(DV) as a backup. There are slight differences in some non-critical dimensions, as shown in figure 5.
• All dimensions in mm.
• Worst-case tolerance for any dimension is
±
0.50mm.
• Maximum depth (from front of screen frame to tips of
interface header posts) is 26mm.
• Dimensions based on information provided by
manufacturers—subject to change without notice.
L y frame height
A y offset pcb edge to hole ctr
B y pcb height
C y hole spacing
D y screen opening
E y character size
F x character size
G x offset pcb edge to hole ctr
H x screen frame
I x screen opening
J x hole spacing
- mounting hole diameter
- frame depth, non-backlit
- frame depth, LED-backlit
K x pcb width
38.40
39.40
2.50
2.50
60.00
60.00
55.00
55.00
25.20
25.20
4.75
4.75
2.95
2.95
2.50
2.50
98.00
98.00
76.00
76.00
93.00
93.00
2.50
2.50
Truly
DV
5.00
5.40
8.50
9.40
98.00
98.00
Power requirements (BL off).................................4.8 to 5.5 Vdc @ 10mA
Power requirements (BL on)...............................4.8 to 5.5 Vdc @ 100mA
User connector .....................5-pin header; 0.025" posts on 0.10" centers
Connector pinout ....................................................+5 GND SER GND +5
Serial input...............RS-232, or inverted TTL/CMOS, 9600 or 2400, N81
Buzzer output .............5V @ 25mA max; pulses approx. 100ms for BELL
Operating temperature.......................................0
°
to 50
°
C (32
°
to 122
°
F)
Serial data rates ............................................................2400 or 9600 bps
Important Notes on Handling, Installation, and Mounting
LCDs are precision-made electro-optical devices that should last a lifetime of normal use.
They are vulnerable to damage from mishandling, however. Our warranty excludes damage
from abuse, so it is very important that you handle and mount your LCD with care. Here are
some tips:
• Handle in a static-safe manner
• Do not drop or strike
• Do not attempt to disassemble, repair, or modify
• Do not drill, cut, notch, grind, etc.
• Mount with machine screws in corner holes
• Do not attempt to enlarge mounting holes
• Do not use glue, epoxy, or paint on this unit
• Protect from water, solvents, oils
• Do not bend, warp, or stress
• Install behind a protective transparent window
• Protect from strong electrical fields, ESD
• Protect from reverse-power hookup
