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McQuay Micro Tech Open Protocol Driver Manual Page 27 of 35
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Array
Location
Read/
Write/
Both
Field Name
Number
of Bytes
Base
Address
Device
Scaling
Method
9
82 b Economizer (Air) Method 1 0x083B
1
83 b Economizer (Water) Changeover Temperature Offset
1 0x091A
1
84 b Fan On Heating Setpoint 1 0x0939
1
85 b Head Pressure Deadband 1 0x08E1
1
86 b Head Pressure Setpoint 1 0x093A
1
87 b Heating Control Deadband 1 0x0894
1
88 b Heating Control Setpoint 1 0x0905
1
89 b Heating Supply Deadband 1 0x0871
1
90 b Heating Supply Setpoint 1 0x0914
1
91 b Humidity Control Type 1 0x0947
1
92 b Humidity Deadband 1 0x094C
1
93 b Humidity Setpoint 1 0x094B
1
94 b Low Entering H20 Comp. Lockout Differential 1 0x092C
1
95 b Low Entering Water Compressor Lockout Setpoint 1 0x092B
1
96 b Min Vane Position/Fan Speed 1 0x0951
1
97 b Minimum Outdoor Air Damper Position 1 0x0934
1
98 b Minimum Supply Air Temperature Control 1 0x0919
1
99 b Unoccupied Cooling Space Differential 1 0x0904
1
100 b Unoccupied Cooling Space Setpoint 1 0x0903
1
101 b Unoccupied Heating Space Differential 1 0x0902
1
102 b Unoccupied Heating Space Setpoint 1 0x0901
1
103 b Water Flow Signal 1 0x0444
1
Appendix A.3. McQuay Equipment Types recognized by the driver.
Code Description
200CFC 200 Series Centrifugal Chiller
100CFC 100 Series Centrifugal Chiller
001ASC Air Screw Chiller
000SCU Self Contained Unit
0050RPC Reciprocating Chiller
Appendix A.4. Direct Addressing
Direct addressing allows data to be read from the McQuay device when the field name is unknown.
McQuay specifies the addresses in hexadecimal notation but they must be specified in the CSV file in
decimal format. For example, to read McQuay address 0x0400, the address in the CSV file must be
entered as 1024.
If reading multiple addressing at once (i.e. if the length is greater than 1) it may be necessary to
adjust the timeout for the Map Descriptor.
It is possible to read multiple addresses using one Map Descriptor; however, it is only possible to
write to a single address.
The following Map Descriptor parameters will need to be defined in addition to those described in
section 4.4.