X2 & X3 RS-485 Pinning

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AccessoriesReadersSK-300InstallationBase station at RS-485X2 & X3 RS-485 Pinning

 

The RS422/RS-485 interface of the devices is provided at terminals 1-8 at the X2 and X3 terminal blocks. The signals have the following meaning:

 

Pin

Name

Definition

1

TxD-b

Data/Out - the data is sent from here. Negated signal

2

TxD-a

Data/Out - the data is received here.

3

RxD-b

Data/In, this is where the data is received. Negated signal

4

RxD-a

Data/In, this is where the data is received.

5

TxD-b'

Direct connection to TxD-b, required for the provision of an RS-485 bus.

6

TxD-a'

Direct connection to TxD-ab, required for the provision of an RS-485 bus.

7

RxD-b'

Direct connection to RTxD-b, required for the provision of an RS-485 bus.

8

RxD-a'

Direct connection to RTxD-a, required for the provision of an RS-485 bus.

 

Click to expand or collaps information.  Termination ET/MT-xx6, ET/MT-xx6-Fx/Tx

The S3 and S4 dip switches activate the bus termination resistors of the COM1 and the COM2 with an RS-422 or RS-485 connection.

 

Switch

Position

Interface

Function

S3-1

OFF

COM1

RS-422/485

No bus terminator resistor set

ON

Bus terminator resistor TxD line

S3-2

OFF

No bus terminator resistor set

ON

Bus terminator resistor RxD line

S4-1

OFF

COM2

RS-422/485

No bus terminator resistor set

ON

Bus terminator resistor TxD line

S4-2

OFF

No bus terminator resistor set

ON

Bus terminator resistor RxD line

 

 

Hinweis

If the HMIs communicate via MPI,

the S3-1 and S4-1 dip switches must NOT be set to ON.

Otherwise, communication between PLC and control system

cannot be guaranteed to run smoothly.

 

Click to expand or collaps information.  Termination ET/MT-xx6-A-...

The S3 dip switches activate the bus termination resistors of the COM1 with an RS-422 or RS-485 connection.

 

Switch

Position

Interface

Function

S3-1

OFF

COM1

RS-422/485

No bus terminator resistor set

ON

Bus terminator resistor TxD line

S3-2

OFF

No bus terminator resistor set

ON

Bus terminator resistor RxD line

 

S4-1

S4-2

S4-3

Interface

Keying

0

0

0

RS-422

Automatic keying

0

1

0

Keying always on

0

0

1

Keying enabled by SW

0

1

1

Driver inactive

1

0

0

RS-485

Automatic keying

1

1

0

Status not permitted

1

0

1

Keying enabled by SW

1

1

1

Driver inactive

Touch switched off:

S4-4 *

OFF

Touch *

Touch switched off

ON

Touch switched on

 

*

It is currently not possible to switch off the touch via the S4-4 dip switch.

 

 

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