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Description
Chillgard 5000
US
3.5 Communications
The device has both digital and analog outputs for use with external controllers or building manage-
ment systems.
3.5.1 Digital Communication
The device is capable of Modbus RTU or BACnet MS/TP outputs. For setup instructions, refer to
Section 5.5, "Communications Output".
For a list of the registers that are available for exchange with the Modbus controller, refer to
Section 17, "Appendix D: Modbus Holding Registers".
For a list of the BACnet Objects that are available for exchange with the BACnet controller, refer to
Section 18, "Appendix E: BACnet Objects".
3.5.2 Analog Communication
The device is capable of the following types of analog outputs:
• 4–20 mA, isolated, current sourcing
• 0–10 Vdc for gas sample point identification
Scale Analog Output: 4–20 mA
Full scale is 1000 ppm.
Normal gas readings are at 4–20 mA. The reading is proportional to the detected gas concentration.
For the factory default of 100% full scale setting (0.016 mA = 1 ppm):
Output
(mA)
Gas Concentration
(ppm)
40
563
6125
7188
8250
9313
10 375
11 438
12 500
13 563
14 625
15 688
16 750
17 813
18 875
19 937
20 1000
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