RS-485, RS-232 and others 19.03.2020 08:48 19.03.2020 08:48

For the RS-485 interface and small distances (dozens of meters up to a 100 m) similar cables can be used, with at least two wires (preferably twisted):

SYKFY 1x2x0.5

 

For the RS-485 interface and a maximum distance it is necessary to use the twisted pair cable with the 0.5 mm to 0.8 mm diameter, shielded, with an impedance close to 120 Ω. There are often special foreign cables offered for these purposes, but their costs tend to be extremely high. We can recommend more competitively priced cables that meet the requirements:

PCEHY 1x2x0.5 (manufactured by VÚKI a.s.)

 

For the RS-485 with interconnected signal GNDs (in large networks at risk of potential differences between the stations - the parasitic potential) and interfaces. We can recommend more competitively priced cables that meet the requirements:

SYKFY 2x2x0.5

PCEHY 4x2x0.6

 

For the RS-232 interface, most cables with 4 wires and minimum 0.4mm diameter, shielded with PVC insulation, are sufficient. Recommended cables:

SYKFY 2x2x0.5

 

Technical characteristics of the PCEHY cables

Type of cable

 

PCEHY 1x2x0.5

PCEHY 4x2x0.5

PCEHY 4x2x0.6

Wave impedance

[Ω]

100 ± 15

100 ± 15

100 ± 15

Electrical resistance of cores

[Ω·km]

97,8

97,8

67,9

Isolation resistance

[GΩ·km]

5

5

5

Specific attenuation 256 kHz

1 MHz

4 MHz

10 MHz

20 MHz

[dB/100m]

2.0

3.5

6.2

9.0

11.9

2.1 2.1

4,3 4,3

6.6 7.2

9.2 10.2

22.0 -

2.1

4.3

6.6

9.2

22.0

Near-end crosstalk damping min. at 1 MHz

10 MHz

100 MHz

[dB]

-

62 56

47 41

32 -

62

47

32

The temperature range

[°C]

-30 ÷ +70 °C

-30 ÷ +70 °C

-30 ÷ +70 °C

Minimum bend radius

[mm]

15

15

15

Cat. EIA/TIA-568

 

-

CAT. 5 CAT. 4

CAT. 5