Rs-485 Wiring For A Mixed Loop - Honeywell NetAXS NX4L1 Installation Manual

Figure B-2: RS-485 Wiring for NetAXS-4 Loop
To Serial Connection

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.
NetAXS™ NX4L1 Access Control Unit Installation Guide, Document 7-901099V3
NetAXS TB7
DIP Switch Settings
S1-S5: Panel Address
S6: ON
J36: CLOSED
J37: CLOSED
DO NOT
CONNECT
SHIELD
NetAXS Panel
Shield
485
Common
3
485 +
1
485 -
2
NetAXS TB7
Ground Shield
DO NOT CONNECT or
GROUND SHIELD
1 2 3
DIP Switch Settings DIP Switch Settings
S1-S5: Panel Address S1-S5: Panel Address
S6: OFF S6: OFF
J36: CLOSED J36: OPEN
J37: CLOSED J37: OPEN
Ground only one
side of cable
shield
4,000 ft. (1,200 m) max, 24 AWG, 2 twisted pairs with
shield, 120 ohm, 23 pf (NCI part no. NCP2441-TN)
RS-485 Wiring for a Mixed Loop
1 2 3
NetAXS TB7
81