Communications wiring
WSHP Open v3
CARRIER CORPORATION ©2021
Integration Guide
All rights reserved
17
5
Connect the N2 EIA-485 network to the controller's
J19
Network Comm
port. Connect to
Net+
,
Net-
, and
SHLD
.
Wire specifications
○
A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○
Maximum wire length 2000 feet (610 meters) or 32 nodes
○
Devices should be daisy-chained and not star-wired
○
Attach the drain/shield wire to both ends of the network segment and through every controller
NOTE
Use the same polarity throughout the network segment.
6
Turn
on
the WSHP Open's power.
Troubleshooting N2
Check the following to troubleshoot your WSHP Open:
1
Verify that the BAS and controller are both set to speak N2 protocol on the Comm Selector DIP switches
DS3 -
DS6
.
2
The BAS and the controller are both set for the same baud rate:
○
9600 for N2
○
Baud rate DIP switches DS2 and DS1
○
Obtain a Modstat of the controller. Scroll to the bottom of the page to
Network Communications
to view
the active protocol and baud rate.
3
The BAS is configured to speak 2-wire EIA-485 to the controller. The BAS may have to configure jumper or DIP
switches on their end.
4
The BAS and the controller have the same communication settings (8 data bits, No Parity, and 1 stop bit).
•
Proper connection wiring between the BAS and the controller.
1
Verify that the rotary address switches are set for the controller's unique slave address.
2
BAS must be reading or writing to the proper point addresses on the controller.
3
BAS is sending requests to the proper slave address of the controller.
NOTES
•
Refer to
Appendix A
(page 35) for the Network Points list.
•
Refer to
Appendix D
(page 48) for the Protocol Implementation Conformance Statement.
