Products Support Sales Company Scott Edwards Electronics, Inc.
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4x20 Mini Serial LCD with Keypad Input, 95-screen Memory

 TRM-425L; size 3.0 x 1.9 in.

TRM-425L Serial LCD

TRM-425L offers a terminal-style serial interface with these advanced features:

  • 1200-9600 baud serial I/O
  • High-contrast, supertwist LCD screen w/LED backlight
  • Interface for matrix keypads up to 16 keys
  • EEPROM storage for 95 full screens of text for instant recall
  • Temperature compensation for stable contrast from 0-50°C
  • Compatible with all features of our popular BPP-420L
  • Includes faceplate, mounting hardware
Dimensional Data Basic Specs Control Characters Prices, More Info
 

Dimensional Data

 

A y offset edge to hole center (top & bottom) 3.50
B y pcb height 47.00
C y hole spacing 40.00
D y screen opening 22.20
E y character size 4.00
F x character size 2.30
G x offset pcb edge to hole center 3.50
H x screen frame 76.20
I x screen opening 60.00
J x hole spacing 70.00
K x pcb width 77.00
L y frame height 32.60
- mounting hardware 4-40
  • All dimensions in millimeters
  • Tolerance is +/- 0.50mm
  • Maximum depth (front of screen to highest point on pcb) is 28mm
  • Includes faceplate, mounting hardware
 

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Basic Specifications

Power requirements 4.8 to 5.5Vdc @ 10mA max (60 mA max, backlight on)
User connector 8-pin header; 0.025" posts on 0.10" centers
Serial Input RS-232 or non-inverted TTL, 1200-9600, N81
Buffer depth 64 bytes
Operating Temperature 0° to 50° C
Storage Temperature -10° to 60° C
LCD type Supertwist (STN), yellow-green
Optimum viewing direction 6 o'clock
 

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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
15 ctrl-O SI Backlight off
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.
  • Recall EEPROM stored screen: ESC E n where n is 0 to 94.
  • Recall EEPROM stored custom-character set ESC e n where n is 0 to 7 (or 191 for ROM set).
  • Store full screen contents in EEPROM ESC X n where n is 0 to 94.
  • Store custom character set in EEPROM ESC x n where n is 0 to 7.
  • Store configuration in EEPROM ESC W b0...b31 where bn are 32 bytes of config data.
 

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Links for Additional Information
Scott Edwards Electronics Inc.
1939 S. Frontage Rd. #F, Sierra Vista, AZ 85635
phone 520-459-4802; fax 520-459-0623
e-mail info@seetron.com