Industrial Electronic Engineers, Inc.
SIZE
A
CODE IDENT NO.
05464
S036X2–XXX–XXXXX
Van Nuys, California
SCALE N/A
REV
N
SHEET 18 of 49
04/10/02
3.2.2
Data Interface
The displays accept either serial or parallel input data and control codes. Internal logic can interface to
either Intel and Motorola processors and emulate equivalent Hitachi 44780 LCD features.
3.2.2.1 Serial
Input Levels
High (space/logic 0)
+3 Volts to +15 Volts
(Conforms to EIA-232 specification).
Low (mark/logic 1)
–3 Volts to –15 Volts.
Baud Rate
Selectable—1200, 9600 or 19200. Maximum available baud rate depends on execution
times. (See Table 3–5)
Data Word
10 Bits. Eight Data Bits with start bit and 1 stop bit.
Parity
None
Error Indicator
If the operating software detects either speed or framing errors during data transmission,
each error character received is replaced on the display screen with the symbol
#
(ASCII
23h).
Format:
+V
(LSB)
(MSB)
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
–V
START
8 DATA BITS
STOP
BIT
BIT
3.2.2.2 Parallel
Input Levels
High
> 3.5 Vdc @ 5.0
µ
A maximum
Low
< 1.5 Vdc @ 0.5 mA maximum
Output Levels
High
> 4.6 Vdc @ 5 mA maximum
Low
< 0.4 Vdc @ 5 mA maximum
Pull–ups
Parallel I/O lines are pulled up to +5 Vdc by internal 10 k
Ω
resistors.
3.2.3
Personality Interface
A strip connector on the circuit card allows user selection of Baud Rate, Interface Mode and Start–up Mode.
The illustration below matches the appearance of the jumper strip on the circuit card.
9600
1200
19200
INTEL
MOT
LCD
NORM
SFTST
Jumpers positions are shown above for the default position. If not installed, the default setting is
automatically selected.
