Specifications

Multi-Zone Gas Monitors
P/N: 3015-5074 Rev 13 57
NOTE: All data sent out from the MZ is in “little endian” byte order (least significant byte
followed by most significant byte). This should be taken into account if the master that
process the data is a “big endian” type. Non-data information (starting address, number of
points, etc.) follows normal MODBUS protocol, which is Big Endian.
B.3.6. MODBUS Exception Responses
The following MODBUS exception responses are supported by the unit.
01 Illegal Function
02 Illegal Data Address
03 Illegal Data Value
06 Slave Device Busy (Occurs only when MZ is connected to the bus through an RD and the RD is
not in the SYSTEM or ZONE VIEW screen)
B.3.7. MODBUS Gas Enumeration
The following table provides decimal and hexadecimal MODBUS enumerations for supported refrigerant
Refrigerant Gas
DEC
HEX
Refrigerant Gas
DEC
HEX
CO
2
/R-744
0
00
FA188
24
18
NH
3
/R-717
0
00
R236FA
25
19
R11
0
00
N1230
26
1A
R12
1
01
R227
27
1B
R22
2
02
HFP
28
1C
R23
3
03
FC72
29
1D
R113
4
04
R21
30
1E
R114
5
05
R125
31
1F
R123
6
06
H1211
32
20
R124
7
07
H2402
33
21
R134A
8
08
R245FA
34
22
R401A
9
09
R422A
35
23
R402A
10
0A
R422D
36
24
R402B
11
0B
R427A
37
25
R404A
12
0C
H1234YF
38
26
R407A
13
0D
R424A
39
27
R407C
14
0E
R426A
40
28
R409A
15
0F
R438A
41
29
R410A
16
10
R32
42
2A
R500
17
11
H1234ZE
43
2B
R502
18
12
R407F
44
2C
R503
19
13
N7100
45
2D
R507
20
14
N7200
46
2E
R508B
21
15
N7300
47
2F
H1301
22
16
N7600
48
30
R408A
23
17
Custom
49
31