Appendix c.4. device scaling method, Appendix c.5. data field name tables, Appendix c.5.1 – FieldServer FS-8700-80 User Manual
Page 35: Appendix c.3, From appendix c.3
McQuay Micro Tech Open Protocol Driver Manual
Page 35 of 43
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Appendix C.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 C.4. Device Scaling Method
There are 5 device scaling methods. X refers to the raw value obtained from the McQuay device. The method that
will be applied to each field is shown in the following table.
Method Id. Device Scaling Method
1
X
2
X/10
3
(X–1000)/10
4
X/2
5
X-100
6
(X–100)/10
7
(X/5)+20
8
(X/5)+55
9
(X/5)
10
(X/5)-100
11
((X-51)*419)/51
12
(X-125)/500
13
(X*0.02)
Note that when device scaling is applied it is applied without consideration of the raw value. Where the raw value
has a special meaning (available in the McQuay packet documents for the equipment type of interest); this driver
does not apply any special consideration to these special values.
Appendix C.5. Data Field Name Tables
7
It is possible to read the device by specifying the address only. Refer to example in 0
Appendix C.5.1.
Equipment Type: 200CFC 200 Series Centrifugal Chiller
Array Location Read/Write/Both Field Name
Number of Bytes Base Address Device Scaling Method
1
r
Model
3
0x0A08
1
4
r
Refrigerant
1
0x0A0B
1
5
r
Units of Measure
1
0x0A0C
1
7
Additional information may be obtained from McQuay International. Request the following document: MicroTech® Series 200 Centrifugal
Chiller Data Communications Packet for Open Protocol™ Cent2_22.doc