Datasheet

EA eDIPTFT43-A
Page 4
ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical errors reserved.
Baud Rates
Baud0 Baud1 Baud2
data format
8,N,1
1 0 0
2400
0 1 0
4800
1 1 0
9600
0 0 1
19200
1 0 1
38400
0 1 1
57600
1 1 1
115200
0 0 0
230400
Pinout eDIPTFT43-A: RS-232/RS-485 mode
Pin Symbol In/Out Function Pin Symbol In/Out Function
1 GND Ground Potential for logic (0V) 21 GND Ground (0V)
2 VDD Power supply for logic (+5V) 22 VDD Power supply (+5V)
3 NC do not connect 23 AIN1
In
analogue input 0..5V
DC impedance 1MOhm
4 NC do not connect 24 AIN2
5 RESET In L: Reset 25 OUT1 / MO8
Out
8 digital outputs
maximum current:
IOL = IOH = 10mA
alternativ up to 8 matrix
keyboard output lines
(reduces the digital
output lines, see chapter
external keyboard)
6 BAUD0 In Baud Rate 0 26 OUT2 / MO7
7 BAUD1 In Baud Rate 1 27 OUT3 / MO6
8 BAUD2 In Baud Rate 2 28 OUT4 / MO5
9 ADR0 In Address 0 for RS-485 29 OUT5 / MO4
10 RxD In Receive Data 30 OUT6 / MO3
11 TxD Out Transmit Data 31 OUT7 / MO2
12 EN485 Out Transmit Enable for RS-485 driver 32 OUT8 / MO1
13 DPOM In
L: disable PowerOnMacro
do not connect for normal operation
33 IN1 / MI8
In
8 digital inputs
open-drain with internal
pullup 20..50k
alternativ up to 8 matrix
keyboard input lines
(reduces the digital input
lines, see chapter
external keyboard)
14 ADR1 In Address 1 for RS-485 34 IN2 / MI7
15 ADR2 In Address 2 for RS-485 35 IN3 / MI6
16 BUZZ Out Buzzer output 36 IN4 / MI5
17 DPROT In
L: Disable Smallprotokoll
do not connect for normal operation
37 IN5 / MI4
18 DNC Out L: internal, do not connect 38 IN6 / MI3
19 WP In L: Writeprotect for DataFlash 39 IN7 / MI2
20
TEST
SBUF
IN
Out
open-drain with internal pullup 20..50k
IN (Power-On) L: Testmode
OUT L: data in sendbuffer
40 IN8 / MI1
application example
RS-232 INTERFACE
If the display is wired as
shown below, the RS-232
interface is selected. The pin
assignment is specified in the
table on the right.
The RxD and TxD lines lead
5V (CMOS level) to a
microcontroller, for example,
for direct connection.
If “genuine” RS-232 levels are
required (e.g. for connection
to a PC), an external level
converter (e.g. MAX232) is
required.
Note:
The pins BAUD 0 to 2, ADR 0 to 2, DPOM,
DPROT and TEST/SBUF have an internal
pullup, which is why only the LO level
(0=GND) is to be actively applied. These
pins must be left open for a Hi level.
For RS232 operation (without
addressing) the pins ADR 0 to ADR 2
must be left open.
On pin 20 (SBUF) the display indicates
with a low level that data is ready to be
retrieved from the internal send buffer.
The line can be connected to an interrupt
input of the host system, for example.
BAUD RATES
The baud rate is set by means of pins 6, 7 and 8 (baud 0 to 2). The data
format is set permanently to 8 data bits, 1 stop bit, no parity.
RTS/CTS handshake lines are not required. The required control is
taken over by the integrated software protocol (see pages 10 and 11).