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myBOX USER MANUAL

4.4.Using the RS-485 interface #

The RS-485 port has tri-state capabilities and allows a single pair of wires to share, transmit and receive signals for half-duplex communications. This “two wire” configuration (note that an additional ground conductor should be used) reduces the cabling cost. RS-485 devices may be internally or externally configured for two wire systems. RS-485 port is internally configured and thus it simply provides A and B connections (sometimes labeled “-” and “+”).

 

4.4.1

 

RJ-45 Pin

Pin name

CANON DB-9 Pin

Function

1

GND

5

Signal Ground

2

RxD

Do Not Use

Do Not Use

3

TxD

Do Not Use

Do Not Use

4

GND

Do Not Use

Do Not Use

5

RxD

Do Not Use

Do Not Use

6

TxD

Do Not Use

Do Not Use

7

A

3

( – )

8

B

7

( + )

 

Alternatively A, B and GND wires can be connected directly to the PLC or device without a need of using BD-9 connector as such.

 

4.4.2

 

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