Rs485 full-duplex interface – Datalogic Scanning DS6400 User Manual

Page 33

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INSTALLATION

2

RS485 Full-Duplex Interface


The RS485 full-duplex interface is used for non-polled communication protocols in
point-to-point connections over longer distances than those acceptable for RS232
communications or in electrically noisy environments. The overall maximum cable length
should not exceed 1200 m (3937 ft).

The following pins of the 25-pin and 26-pin connector are used for RS485 full-duplex
interface connection:

Pin Name

Function

2

TX485 +

RS485 output (+)

3

RX485 +

RS485 input (+)

4

TX485 -

RS485 output (-)

5

RX485 -

RS485 input (-)

7 GND_ISO

Main

signal

ground

DS6400

7

GND_ISO

TX485+

2

RX485+

3

TX485-

4

RX485-

5

TX485+

TX485-

SGND Main Isolated

USER INTERFACE

RX485-

RX485+

1

Earth

Ground

CHASSIS

Figure 19 - RS485 Full-Duplex Interface Connections



NOTE

For applications that do not use RX485 signals, do not leave these lines
floating but connect them to GND_ISO as shown below.


DS6400

7

GND_ISO

TX485+

2

TX485-

4

RX485+

3

RX485-

5

SGND Main Isolated

USER INTERFACE

RX485-

RX485+

1

Earth

Ground

CHASSIS

Figure 20 - RS485 Full-Duplex Interface Connections Using Only TX Signals

17

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