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FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
TABLE 19 - COMMUNICATION DATA/WRITE COMMAND
ITEM
1
Chiller operation signal
2
Chiller stop signal
3
Steam control valve upper limit
4
User-Created
The diagrams and tables that follow detail some of the
work that must be performed by the customer to be
sure that the communication systems work properly.
Serial Interface (COM2)
FIGURE 30 - CONNECTION DETAIL FOR D-SUB 9PIN
TABLE 20 - SCOPE OF DELIVERY OF UPPER COMMUNICATION SYSTEM
ITEM
Control panel with upper
communication function
Wiring work for Modbus RTU
communication
Communication program for central
monitoring unit
JOHNSON CONTROLS
Set point
CUSTOMER
X
X
ADDRESS
02001
ON at CHILLER OPERATION, PULSE
02002
ON at CHILLER STOP, PULSE SIGNAL
00201
0000~1000 unit, 1 unit=0.1%
00203
0050~1000 unit, 1 unit=0.1°F
Connect User-Created Cable
JCI
X
Communication protocol: Modbus RTU
Apply RS485 communication cable. See Table 21
on page 88 .
See Table 22 on page 91 for the details of the
communication protocol, path type, function code,
communication data address, and other applicable
communication information not defined here.
SECTION 4 - TECHNICAL DATA
CONTENT
SIGNAL
LD20597a
REMARKS
4
87
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Troubleshooting
