Table 20: Write command
Item
Address
Content
1 Chiller-heater operation
signal
02001
ON at CHILLER-HEATER OPERATION, PULSE SIGNAL
2 Chiller-heater stop signal
02002
ON at CHILLER-HEATER STOP, PULSE SIGNAL
3 Set point
00203
0050~1000 unit, 1 unit=0.1°C
User-created
The diagrams and tables that follow detail some of the work that must be performed by the
customer to ensure that the communication systems work correctly.
Figure 44: Connection detail for D-sub 9 pin serial interface (COM2)
Table 21: Scope of delivery of upper communication system
Item
Customer
JCI
Remarks
Control panel with upper
communication function
X
Communication protocol: Modbus RTU
Wiring work for Modbus
RTU communication
X
Apply RS485 communication cable. See Table
18 for more information.
Communication program
for central monitoring
unit
X
See Table 18 and Table 19 for the details of the
communication protocol, path type, function
code, communication data address, and so on.
79
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater