RS485

The RS485 interface is connected via the X6 terminal block. Depending on the variant, a 12- or 16-pole pluggable terminal block is used.

Assignment of terminal block X6

X6

PIN

Designation

Notes

1-4

-

Voltage supply

5-8

-

CAN

9

VCC+5V

Termination potential for RS485

10

GND_RS

Reference potential for serial interfaces (galvanically isolated)

11

RxD/TxD-P

RS485 data signal

12

RxD/TxD-N

RS485 data signal inverted

13-16

-

RS232interface

The terminals for the RS485 interface are always identical, independent of the above design.

Specification

Fieldbus type

RS485 2W

Common-ode voltage range

0...12 V to the reference potential.

Transmission speed

20, 25, 50, 100, 125, 250 kbit/s; adjustable via CN01

Transmission medium

Twisted pair
maximum cable length 1200 m depending on the transmission speed

Potential separation

Functional insulation between terminals and device potential.

Bus termination

120 Ω external (between RxD/TxD-P and RxD/TxD-N) at both ends of the bus cable.