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Installation
Set the SW3 Comm Selector DIP switches DS1 and DS2 for the appropriate communications speed (9600,
3
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 Selection Table
Baud Rate
9,600
19,200
38,400
76,800
Set SW3 Comm Selector DIP switches DS3 through DS6 for Modbus. See example below.
4
Leave DS7 and DS8 in the OFF position. These switches are not applicable to Modbus.
5
SW3 Protocol Switch Settings for Modbus
DS8
Off
The following example shows the DIP switches set for 9600 baud and Modbus.
Connect the Modbus EIA-485 network to the WSHP Open's J19 port. Connect to Net+, Net-, and SHLD.
6
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.
Turn on the WSHP Open's power.
7
8
SW3/DS2
SW3/DS1
Off
Off
On
Off
Off
On
On
On
DS7
DS6
DS5
Off
Off
On
DS4
DS3
On
Off
WSHP Open v3
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