Communications wiring
WSHP Open v3
CARRIER CORPORATION ©2021
Integration Guide
All rights reserved
14
3
Set the
SW3
DIP switches
1
and
2
for the appropriate communications speed (9600, 19.2k, 38.4k, or 76.8k
bps).
NOTE
Use the same baud rate and communication settings for all controllers on the network segment. The
WSHP Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.
Baud DIP switch settings
Baud rate
2
1
9,600 bps
Off
Off
19.2 kbps
On
Off
38.4 kbps
Off
On
76.8 kbps
On
On
4
Set the remaining DIP switches as follows:
Modbus DIP switch settings
8
7
6
5
4
3
Off
Off
Off
On
On
Off
The following example shows the DIP switches set for 9600 baud and Modbus.
5
Connect the Modbus EIA-485 network to the WSHP Open'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.
