Johnson Controls YEWS Series, Installation, Operation And Maintanance Instructions

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(6) How to monitor it remotely
YEWS centralized controller XS08 supply a RS485 communicaiton port for users, hence, users are able to monitor the
operation of chillers conveniently with it, and connect easily it to external integration system when connecting cable
according to the MODBUS protocol.
Wiring sketch
RS232/RS485
converter
XS08 display
Computer
To com
port
RS485
Communication
Cable(twisted-pair)
9pin
Communication
cable
MODBUS address of centralized controller has to be set
and PC can read the data of chillers or operate the chillers
conveniently affer connnecting cables according to the
figure above. These paratmeters must be input in
parameter setting interface-10, as follows.
MODBUS ADDRESS 001
CLEAR RECORD YES
CLEAR FAULT RECORD YES
DEFAULT DATA YES
BATTERY BACKUP YES
PASSWORD YES
TIME LIMIT YES
LIMITED HOURS 2100H
RETU
NEXT
BACK
Notes:
1. The cable connecting RS232/RS485 converter to
XS08 must be the same one.
2. Communication Cable must be a shield Twisted-pair
with character resistance 120
±
20%
Ω
, 0.5mm2 cross-
section.
3. Communication Cable must be shorter than 1000m.
4. Port A1 and B1 of XS08 should be connected to the
communication port of PC, and RS232/RS485 converter
must be used to connect them. It
’
s certain to connect
communication cable properly, which is polar, avoiding
to communicaiton fault.
YEWS-E Water Cooling Screw Chiller/Heat Pump
48