Table of Contents
Advertisement
Modbus
Check the following to troubleshoot your WSHP Open:
Verify that the BAS and controller are both set to speak the Modbus RTU protocol on the Comm Selector DIP
1
switches DS3 - DS6.
Verify that the BAS and the controller are both set for the same baud rate:
2
•
Baud rate DIP switches DS2 and DS1
Obtain a Modstat of the controller through the BACview device. Click and hold the FN key and the . key at
○
the same time. Scroll to the bottom of the page to Network Communications to view the active protocol
and baud rate.
Verify that the BAS is configured to speak 2-wire EIA-485 to the controller. The BAS may have to configure
1
jumper or DIP switches on their end.
Verify that the BAS and the controller have the same communication settings (8 data bits, No Parity, and 1
2
stop bit).
Verify proper connection wiring between the BAS and the controller.
3
Verify that the rotary address switches are set for the controller's unique slave address.
4
BAS must be reading or writing to the proper point addresses on the controller.
5
BAS is sending requests to the proper slave address of the controller.
6
NOTE Refer to Appendix C (page 33) for the Protocol Implementation Conformance Statement.
Modbus Exception Codes that might be returned from this controller
Codes
01
02
04
Johnson N2
Check the following to troubleshoot your WSHP Open:
Verify that the BAS and controller are both set to speak N2 protocol on the Comm Selector DIP switches DS3 -
1
DS6.
Verify that the BAS and the controller are both set for the same baud rate:
2
9600 for N2
○
•
Baud rate DIP switches DS2 and DS1
Obtain a Modstat of the controller through the BACview device. Click and hold the FN key and the . key at
○
the same time. Scroll to the bottom of the page to Network Communications to view the active protocol
and baud rate.
WSHP Open v3
Name
Description
Illegal Function
The Modbus function code used in the query is not
supported by the controller.
Illegal Data
The register address used in the query is not supported
Address
by the controller.
Slave Device
The Modbus Master has attempted to write to a non-
Failure
existent register or a read-only register in the
controller.
25
Advertisement
Table of Contents
