Westermo EDW-100 Betriebsanweisung PDF herunterladen (Seite 24)

6616-2202

Applications

=Termination

EDW-100

Slave unit Slave unit Slave unit

EDW-100

Slave unit Slave unit Slave unit

Max 0.3 metre

=Termination

T+

T–

T+T- T +T- AB

R+

R–

T+

–

R– R+ R+T– T– B’ A’ B AT+T+ R–

2-wire termination

4-wire termination

Termination recommendations

The RS-422/485 line must be terminated regardless of the cable length. The termination

is ideally placed at the extreme ends of the cable see examples above. The description

of the RS-422/485 pin outs will vary between manufactures. For some brands the T+

corresponds to A T- to B, R+ to A´ and R- to B´, but other brands might use some other

naming convention. If a unit does not work it can help to swap A and B. If difficulty is

being experience contact Westermo for further guidance.

RS-422/485 general advice

Power

SDRAM

8 MB

FLASH

2 MB

DIP-switch

JTAG

PROCESSOR

DEBUG

Data

Address

CTRL

MAC

XTAL

PHY

XTAL

CLK

RESET

5 V = >3.3 V

3.3 V = >1.5 V

Power

Connector

I/O

RJ-45

LED

stretch

D-sub

SERIAL CH 1

Ethernet 1

Power secondary 5 V

RS-232

Screw terminal

RS-422/485

Isolation from all other interfaces

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