3

EA KIT320-8

RS-422 Connector J3

Pin

Symbol

Function

1

VDD

+ 5V Supply

2

Data In-

Receive Data

3

Data In+

Receive Data

4

Data Out- Transmit Data

5

Data Out+ Transmit Data

6

HS In-

Handshake

7

HS In+

Handshake

8

HS Out-

Handshake

9

HS Out+

Handshake

10

GND

0V Ground

RS-232 Connector J3

Pin Symbo In/Out

Function

1

VDD

-

+ 5V Supply

2

DCD

-

Connected to DTR

3

DSR

-

Connected to DTR

4

TxD

Out

Transmit Data

5

CTS

In

Clear To Send

6

RxD

In

Receive Data

7

RTS

Out

Request To Send

8

DTR

-

see Pin 2, Pin 3

9

-

-

NC

10

GND

-

0V Ground

Baudrates

DIP Switch

data format

8,N,1

1

2

3

ON

ON

2,400

OFF

ON

ON

4,800

OFF

ON

9,600

OFF OFF

ON

ON

19,200

OFF

ON

38,400

OFF

OFF

ON

57,600

OFF OFF

115,200

OFF OFF OFF

Extension J5

Pin Symbol In/Out

Function

1

VU

-

9..35V Supply

2

VDD

-

+ 5V Supply

3

GND

-

0V, Ground

4

TxD5

Out

Transmit Data

5

RxD5

In

Receive Data

6

RTS5

Out

Request To Send

7

CTS5

In

Clear To Send

8

RESET

In

L: Reset

9

SCL

Out

I2C Bus, Clock

10

SDA

In/Out I2C Bus, Data

View from rear side

SUPPLY VOLTAGE

In the standard model, the supply

voltage of +5V is fed in via the

screw-type terminal J1. In the case

of the version for 9V to 35V

(EA OPT-9/35V), the power is

supplied via J2.

Important: It is imperative that the

polarity is correct. Even very brief

polarity reversal can damage the

entire operating unit immediately

and irreparably.

BAUD RATES

The baud rate can be set by means of the three DIP switches on the left. When

the equipment is delivered, the setting is 9,600 baud (DIP 3 ON). Please note

that the internal data buffer is only 128 bytes. The RTS handshake line must

therefore be queried (+10V level: data can be accepted; -10V level: display is

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

RS-232/RS-422

The operating unit is shipped with an RS-

232 interface as standard. The pin

assignment of connector J3 is then as

shown in the table on the left. J3 has a grid

of 2.54mm. If the operating unit is ordered

together with the EA OPT-RS4224 option,

special RS-422 drivers are fitted. The pin

assignment in the table on the right then

applies.

Incidentally, the same serial

data with 5V levels and

TTL logic is available at

the J5 eyelet strip. These

levels are suitable for

direct connection to a µC.

If these signals are used,

4 solder straps LB1, LB2,

LB 5 und LB 6 has to be

opened !