
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
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