Keri-systems NXT 4x4 Bedienungsanleitung PDF herunterladen (Seite 3)

NXT 4x4

Installation Guide

Page 3 of 4 P/N: 01998-001 Rev. G

Table 2: Reader and 4x4 Cable Options

Connection Type

Total

Run

Length

Shielded, Stranded,

2 Twisted-Pair

a. Keri recommends this cable type for best system performance.

CAT-5

b. Keri’s preferred low-cost option. Keri has no suggested vendor for this type of cable.

Shielded, Stranded,

4-Conductor

c. Use care when routing this type of cable as it can make the system more susceptible to EMI.

AWG Suggest AW G Suggest

RS-485 bus 

from NXT-2D/-4D 

to NXT-4x4 only

up to

500 feet

18 - Data plus

4x4 Power

22 - Data only

Belden

8723

unshielded 18 - Data plus

4x4 Power

22 - Data only

Windy City:

414302-S

West Penn: 244

Tappan:

1880AB4M-CM

RS-485 bus 

from NXT-2D/-4D 

to NXT-4x4 

and NXT Readers

up to

500 feet

18 - Data plus

4x4 Power

22 - Data only

Belden

8723

shielded 18 - Data plus

4x4 Power

22 - Data only

Windy City:

414302-S

West Penn: 244

Tappan:

1880AB4M-CM

RS-485 bus 

from NXT-2D/-4D 

to NXT Readers only

up to

1,000 feet

22 for Data Belden

8723

shielded 22 for Data Windy City:

416303-S

West Penn: 241

Tappan:

2280AB4M-CM

Table 3: Controller Power, Inputs, and Outputs Cable Requirements

Connection

Total Run

Length

# of

Conductors

Shielded Stranded

Twisted

Pair

AWG

Belden

Equivalent

controller power

250 feet

a. To meet CE and C-tick regulations, the length of the controller power line can be no longer than 3 Meters

(9.85 feet).

2 N Y Y 18 8461

earth ground shortest

path

b. Use the shortest possible path from earth ground point to PCB. Connect the earth ground only to the 

designated pin on the terminal block. This is important as all transient protection for the unit is made through

this earth ground connection. For unit protection, the earth ground connection should always be made first.

1 N N n/a 18 no specific

requirement

inputs and outputs

c. Values listed are minimums. Individual input and output devices may have more specific requirements.

500 feet 2 N Y n/a 22 no specific

requirement

1 2 3 4

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