BPP-420L Hardware Reference

This page describes the BPP-420's hardware, hookup, configuration and specifications. It also applies to the BPP-420VY and other variants with LCDs of different colors/modes. For information on sending data and instructions to the display please see the programmer's reference.

Table of Contents

Cautions and Warranty

Handling, Usage and Operating Precautions

Seetron warrants this product against defects in materials and workmanship for a period of 90 days. If you discover a defect, we will, at our option, repair, replace, or refund the purchase price. Return the product with a description of the problem. We will return your product or its replacement via standard shipping. Expedited shipping is available at the customer's expense. Note: Violating the usage guidelines above, or attempting to repair or modify the module or the serial interface, voids this warranty.

Connection/Configuration

Hooking up the BPP-420 requires three connections: 5Vdc (regulated), serial input (2400 or 9600 bps, N81) and ground (connected to both power and the computer/controller).

BPP-420 serial interface hookup

BPP-420 Serial Interface Board.

Configuration Jumpers

There are two configuration jumpers on the BPP-420 serial interface.

Do not install a jumper at Old Mode unless you specifically need to emulate an old (early 1990s) BPP-420. This mode disables the features described in the current programmer's manual.

Serial Input

BPP-420s accept inverted serial input, such as the output of an *RS-232 port. The direct output of a UART is noninverted; it is not compatible unless inverted (NOT gate). In some cases, workarounds exist to avoid the additional component:

*RS-232 serial signals often use ±10V signals. These voltages will not harm the BPP-420, which has a protective "clamp" circuit on its serial input.

Serial Input Voltage Threshold

The BPP-420 is directly compatible with both RS-232 and inverted logic-level serial hookups. This information is provided for the benefit of users who may be interfacing the display to low-voltage or nonstandard logic devices. Low-to-high transition (highlighted in the table) is the beginning of the serial start bit.

Serial Input Thresholds (Vdd=5V)
Transition Vthreshold
Low-High↑ 2.4V
High-Low↓ 1.4V

Solder Pads

"Bell" Output. A piezo buzzer may be connected to the pads marked "BELL" on the interface board. The buzzer will beep when the ctrl-G Bell character is received. A compatible buzzer will have these specs:

BL_ON Jumper. Shorting the pads marked "BL_ON" wires the backlight on (it is normally controlled by the ctrl-N and ctrl-O instructions).

Bright↑ Jumper. Shorting the pads marked "Bright↑" doubles the backlight current.

Dimensions (in mm)

Total depth (front of screen to highest point on pcb) is 26mm.

dimension
A y offset edge to hole center (top & bottom) 2.50
B y pcb height 60.00
C y hole spacing 55.00
D y screen opening 25.20
E y character height 4.75
F x character width 2.95
G x offset pcb edge to hole center 2.50
H x screen frame 98.00
I x screen opening 76.00
J x hole spacing 93.00
K x pcb width 98.00
L y frame height 42.00
- mounting hole diameter 2.50
- screen frame depth 8.50

Mounting

As mentioned in "Cautions" above, BPP-420 must be mounted behind a transparent window in any permanent installation. If it is not, the screen will be vulnerable to damage from users' fingers (e.g., electrostatic discharge or mechanical stress), moisture, dirt, mechanical damage, etc. Damage of this kind is not covered by warranty.

An inexpensive mounting kit is available for these devices (PN: BEZ-420), but any transparent barrier will suffice.

Specifications

Power Requirements 4.8 to 5.5Vdc at 10mA (100mA backlight on)
Serial Input (electrical) RS-232 (±15V OK), inverted TTL
Serial Input (logic/data) Inverted, 2400 or 9600bps
User Connector 5-pin header, 0.025in. posts on 0.10in. centers
Connector Pinout +5V Gnd Serial Gnd +5V
Operating Temp. 0° to 50° C (32° to 122°F)
Display Type STN Character LCD, 4 lines x 20 characters
Character Size 5x7 pixels, 4.75mm (0.19in.) height
Overall Size (wxh) 98x60mm (3.86x2.36in.)
Depth 26mm (1.02in.)
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