RS-485 Wiring for a Mixed Loop
NetAXS™ NX4L1 Access Control Unit Installation Guide, Document 7-901099V3 81
Figure B-2: RS-485 Wiring for NetAXS-4 Loop
4.0 RS-485 Wiring for a Mixed Loop
• The 485+ (A) of one controller is connected to 485+ (A) of the next controller
using one wire of the first twisted pair.
• The 485– (B) of one controller is connected to 485– (B) of the next controller
using the other wire of the first twisted pair.
• On a loop that contains both NetAXS-123 and NetAXS panels (mixed loop), the
second pair of the wires are twisted together and connected to the RS-485 COM
on the next NetAXS-4 controller to the RS-485 COM of the next NetAXS-4
controller in the loop.
• Do not connect the RS-485 COM on the NetAXS-123 controllers. The RS-485
COM is bypassed on the NetAXS-123 controller.
• The shield is only connected on one end of the cable, not both.
See Figure B-3 on page 82.
DO NOT CONNECT or
GROUND SHIELD
To Serial Connection
DIP Switch Settings
S1-S5: Panel Address
S6: OFF
J36: CLOSED
J37: CLOSED
DIP Switch Settings
S1-S5: Panel Address
S6: OFF
J36: OPEN
J37: OPEN
DIP Switch Settings
S1-S5: Panel Address
S6: ON
J36: CLOSED
J37: CLOSED
NetAXS TB7
NetAXS TB7
Ground only one
side of cable
shield
Shield
Ground Shield
485 +
485 -
485
Common
4,000 ft. (1,200 m) max, 24 AWG, 2 twisted pairs with
shield, 120 ohm, 23 pf (NCI part no. NCP2441-TN)
NetAXS Panel
DO NOT
CONNECT
SHIELD
3
1
2
NetAXS TB7
123
123
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