EAeDIP240-7

Page 5

Specifications may be changed without

prior notice. Printing error reserved

RS-232/RS-422 INTERFACE

Wiring the display as shown below selects the RS-232/RS-422 interface. The pin assignment is

shown in the table on the right.

The RxD and TxD lines have a 5V

CMOS line level. If “genuine” RS-

232 levels are required (e.g. for

direct connection to a PC), an

external level converter such as the

ICL232 is necessary.

Baud rates

Baud0 Baud1 Baud2

Data format

8,N,1

0

0

0

1200

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

Pinout eDIP240-7

RS-232 / RS-422 mode

Pin

Symbol

In/Out Function

Pin Symbol Function

1

GND

-

Ground Potential for logic (0V)

21

N.C.

not connected

2

VDD

-

Power supply for logic (+5V)

22

N.C.

not connected

3

VADJ

In

Operating voltage for LC driving

(input)

23

N.C.

not connected

4

VOUT

Out

Output voltage for LC driving

24

N.C.

not connected

5

RESET

-

L: Reset

25

N.C.

not connected

6

BAUD0

In

Baud Rate 0

26

N.C.

not connected

7

BAUD1

In

Baud Rate 1

27

N.C.

not connected

8

BAUD2

In

Baud Rate 2

28

N.C.

not connected

9

ADR0

In

Address 0 for RS-485 (V1.3 or later)

29

N.C.

not connected

10

RxD

In

Receive Data

30

N.C.

not connected

11

TxD

Out

Transmit Data

31

N.C.

not connected

12

EN485

Out

Transmit Enable for RS-485 driver

32

N.C.

not connected

13

DPOM

In

L: disable Power-On-Macro

do not connect for normal operation

33

N.C.

not connected

14

ADR1

In

Address 1 for RS-485 (V1.3 or later)

34

N.C.

not connected

15

ADR2

In

Address 2 for RS-485 (V1.3 or later)

35

N.C.

not connected

16

BUZZ

Out

Buzzer output

36

N.C.

not connected

17 EEP_SDA

Bidir. Serial Data Line for int. EEPROM

37

N.C.

not connected

18 EEP_SCL

Out

Serial Clock Line for int. EEPROM

38

N.C.

not connected

19

EEP_WP

In

H: Write Protect for int. EEPROM

39

N.C.

not connected

20

TEST

SBUF

IN

Out

open-drain with internal pullup 20..50k

IN (Power-On) L: Testmode

OUT L: data in sendbuffer

40

N.C.

not connected

Note:

At pin 20 (SBUF), the display sets a low level to indicate that data is available to be fetched from the internal send buffer.

This line can, for instance, be connected to an interrupt input of the host system.

BAUD RATES

The baud rate is set with pins 6, 7 and 8 (Baud0 through 2). The data

format is set permanently to 8 data bits, 1 stop bit, no parity.

RTS/CTS handshaking lines are not required. The integrated software

protocol takes on the necessary control functions (see pages 8 and 9).

Application example