AERMEC DUALCHILLER CONTROL Instalación Y Uso página 15

The MODBUS communication protocol
has been developed making reference
to Modicon document no. PI-MBUS-
300, Rev. J.
is in RTU mode with:
9. 1 READ DIGITAL DATA
ADDRESS DATA ITEM
1 On / Off
2 Cold/Hot
3 Reset
4 Defrost 1
5 Defrost 2
6 Defrost 3
7 Defrost 4
8 RA1
9 RA2
10 RA3
11 RA4
12 FLOW SWITCH (Master)
13 FLOW SWITCH (Slave)
14 Cond. Pump / FL (Master)
15 Cond. Pump / FL (Slave)
16 Ter. Pump Evap (Master)
17 Ter. Pump Evap (Slave)
18 MT CP 1
19 MT CP 1A
20 MT CP 1B
21 MT CP 2
22 MT CP 2A
23 MT CP 2B
24 MT CP 3
25 MT CP 3A
26 MT CP 3B
27 MT CP 4
28 MT CP 4A
29 MT CP 4B
30 Low Press. 1
31 Low Press. 2
32 Low Press. 3
33 Low Press. 4
34 AP – TGP 1
35 AP – TGP 2
36 AP – TGP 3
37 AP – TGP 4
38 Antifreeze 1
39 Antifreeze 2
40 Antifreeze 3
41 Antifreeze 4
42 MT MV 1
43 MT MV 2
44 MT MV 3
MODBUS COMMUNICATION PROTOCOL
9
Baud rate settable from 1200 to
19200
1 start bit
no parity
2 stop bits
The implemented codes are
01 Read digital data
03 Read analog data
05 Write digital data
DESCRIPTION
Off = 0 ; On = 1
Cold = 0; Hot = 1;
Reset alarms
Status of defrosting circuit 1
Status of defrosting circuit 2
Status of defrosting circuit 3
Status of defrosting circuit 4
Alarm summary circuit 1
Alarm summary circuit 2
Alarm summary circuit 3
Alarm summary circuit 4
MASTER board flow switch alarm
SLAVE board flow switch alarm
MASTER board condenser pump thermal switch
SLAVE board condenser pump thermal switch
MASTER board evaporator pump thermal switch
SLAVE board evaporator pump thermal switch
Compressor 1 thermal switch
Compressor 1A thermal switch
Compressor 1B thermal switch
Compressor 2 thermal switch
Compressor 2A thermal switch
Compressor 2B thermal switch
Compressor 3 thermal switch
Compressor 3A thermal switch
Compressor 3B thermal switch
Compressor 4 thermal switch
Compressor 4A thermal switch
Compressor 4B thermal switch
Low pressure circuit 1
Low pressure circuit 2
Low pressure circuit 3
Low pressure circuit 4
High pressure or discharge gas thermal switch circuit
1
High pressure or discharge gas thermal switch circuit
2
High pressure or discharge gas thermal switch circuit
3
High pressure or discharge gas thermal switch circuit
4
Antifreeze circuit 1
Antifreeze circuit 2
Antifreeze circuit 3
Antifreeze circuit 4
Circuit 1 fan thermal switch
Circuit 2 fan thermal switch
Circuit 3 fan thermal switch
15