Description
10 RMWH-SVX001C-EN
For a list of the registers that are available for exchange
with the MODBUS® controller, refer to “Appendix D:
MODBUS Holding Registers,” p. 58.
For a list of the BACnet® Objects tha
t a
re available for
exchange with the BACnet® controller, refer to “Appendix
E: BACnet Objects,” p. 62.
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
Full scale is 1000 ppm.
Normal gas readings are at 4–20 mA. The reading is
pr
oportion
al to the detected gas concentration.
For the factory default of 100 percent full scale setting
(0.016 mA = 1 ppm), refer to the following
table.
Table 1. Scale
analog output: 4–20 mA
Output (mA) Gas Concentration (ppm)
4 0
5 63
6 125
7 188
8 250
9 313
10 375
11 438
12 500
13 563
14 625
15 688
16 750
17 813
18 875
19 937
20 1000
Table 2. Analog output settings
Warm-up
•Default = 3.5 mA
• User adjustable between
0 and 3.75 mA
Calibration (non-configurable)
•3.0 mA
Fault
•Default = 2.0 mA
• User adjustable between
0.5 and 3.75 mA
Device over range (non-configurable)
•21 mA
The voltage output can be used to identify any active gas
sample line.
Table 3. 0–10 Vdc
Sample Line
Vdc
4 or 8 pt system 16 pt system
1 1 1.0
2 2 1.5
3 3 2.0
4 4 2.5
5 5 3.0
6 6 3.5
7 7 4.0
8 8 4.5
9 — 5.0
10 — 5.5
11 — 6.0
12 — 6.5
13 — 7.0
14 — 7.5
15 — 8.0
16 — 8.5
While the device is in calibration mode, the output is
10 Vdc.
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