Data transmission

RS 485

RS 485-iS

Fiber-optic

Transmission rate

9.6 kbit/s ... 12 Mbit/s

9.6 kbit/s ... 1.5 Mbit/s

9.6 kbit/s ... 12 Mbit/s

Cable

2-wire shielded

2-wire shielded

Plastic as well as multi-mode and single-mode glass-fiber

Type of protection

EEx(ib)

Topology

Line, tree

Line

Ring, star, line

Nodes per segment

32

32¹⁾

–

Nodes per network (with repeater)

126

126

126

Cable length per segment dependent on transmission rate

1 200 m at max. 93.75 kbit/s

1 000 m at 187.5 kbit/s
400 m at 500 kbit/s
200 m at 1.5 Mbit/s
100 m at 12 Mbit/s

1 000 m at 187.5 kbit/s¹⁾

400 m at 500 kbit/s ¹⁾

200 m at 1.5 Mbit/s ¹⁾

Max. 80 m (plastic)

2 ... 3 km (multimode glass fiber)

>15 km at 12 Mbit/s (single-mode glass-fiber)

Repeater for signal refreshing with RS 485 networks

Max. 9

Max. 9¹⁾

Not relevant